CN104243374B - A kind of method for transmitting signals, apparatus and system - Google Patents

Abstract

Embodiments of the present invention provide a signal transmission method, device, and system, which relate to the field of communication technology, avoid interference between channels in signal transmission, and reduce pressure on channel feedback. The method specifically includes: the first base station obtains channel parameters according to a channel estimation algorithm; generates a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; and sends the first precoding matrix to the second A user equipment; receiving a first coded signal sent by a first user equipment; receiving a second coded signal sent by a second user equipment; detecting the first received signal to obtain a first superimposed signal; receiving a signal sent by the second base station A second superimposed signal: obtaining a processed signal according to the first superimposed signal and the second superimposed signal. The invention is applied in signal transmission technology.

Description

A signal transmission method, device and system

technical field

The present invention relates to the technical field of communication, and in particular to a signal transmission method, device and system.

Background technique

At the edge of the cell, there are signals from the cell and adjacent cells at the same time. In the uplink channel, the base station will receive signals from users in adjacent cells, and in the downlink channel, users will receive signals from base stations in adjacent cells. Signals from adjacent cells constitute inter-cell interference (Adjacent Cell Interference, ACI for short) to the local cell, seriously affecting performance. In order to suppress ACI, the concept of Coordinated Multiple Points Transmission (CoMP for short) is introduced in LTE, and the impact of ACI on performance is reduced through inter-cell coordination.

The CoMP technology in Long Time Evolution (LTE for short) can be roughly divided into two categories, Joint Transmission/Reception (JT/JR for short) technology and Cooperative Beam Forming (CBF for short) technology . In the existing technology, JT/JR technology is generally used to suppress ACI. JT/JR technology shares the data to be sent/received between the base stations of adjacent cells, and sends the data to be sent by each cell to each base station after joint encoding. Or correspondingly combine and jointly detect the signals received by each cell to suppress ACI. However, in the JT/JR technology, the design of the precoding matrix of each user equipment (User Equipment, referred to as UE) is only related to the channel state information (Channel State Information, referred to as CSI) (JT) from all sources to itself and from itself to all receivers. CSI (JR) is related, but not related to CSI (JR) from all transmitters to other receivers and CSI (JR) from other transmitters to all receivers, which determines that the selection of the final precoding matrix must stay at a very low equilibrium point . In this way, the interference power will be very large, resulting in a huge loss of the signal-to-interference-noise ratio at the receiving end. At the same time, the JT/JR technology needs to know the global CSI at the source, which puts a lot of pressure on the channel feedback.

Contents of the invention

Embodiments of the present invention provide a signal transmission method, device and system, which reduce the interference between channels in signal transmission and reduce the pressure on channel feedback.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, a signal transmission method is provided, including:

The first base station obtains channel parameters according to a channel estimation algorithm;

Generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; wherein the first precoding matrix is used to encode a first transmission signal;

sending the first precoding matrix to the first user equipment;

Receive a first encoded signal sent by the first user equipment; wherein, the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix;

Receiving a second encoded signal sent by the second user equipment; wherein, the second encoded signal is obtained by encoding the second transmitted signal by using a second precoding matrix; the second precoding matrix is obtained by the second base station according to interference alignment algorithmically generated;

Detecting the first received signal to obtain a first superimposed signal; wherein the first superimposed signal is a superposition of an interference signal of the first base station and a useful signal; the first received signal includes: the first code signal and said second encoded signal;

receiving a second superimposed signal sent by the second base station; wherein, the second superimposed signal is obtained by the second base station detecting a second received signal; the second received signal includes: the first coded signal and the a second encoded signal;

Obtain a processed signal according to the first superimposed signal and the second superimposed signal.

In a first possible implementation manner, in combination with the first aspect, after obtaining the processed signal according to the first superimposed signal and the second superimposed signal, the method further includes:

Sequence detection is used on the processed signal to obtain the first sent signal.

In a second possible implementation manner, in combination with the first aspect or the first possible implementation manner, the first base station obtains channel parameters according to a channel estimation algorithm, including:

Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm;

The channel parameters are obtained according to the channel fading parameters.

In a third possible implementation manner, in combination with the first aspect or the first possible implementation manner, the generating the first precoding matrix of each data stream of the first user equipment according to the interference alignment algorithm includes:

Arbitrarily selecting an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer;

Acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-1th precoding vector of the second precoding matrix The coding vector is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; the i is a positive integer greater than 1.

In a second aspect, a signal transmission method is provided, including:

The first user equipment receives a first precoding matrix sent by a first base station; wherein, the first precoding matrix is generated by the first base station and is used to encode a first transmitted signal;

Encode the first transmitted signal according to the first precoding matrix to obtain a first encoded signal;

sending the first coded signal so that the first base station obtains a signal without interference according to the first received signal; wherein the first received signal includes: the first coded signal and the second coded signal; the The second encoded signal is obtained by the second user equipment encoding the second transmitted signal according to the second pre-pre-coding matrix; the second pre-coding matrix is generated by the second base station.

In a third aspect, a signal transmission method is provided, including:

The first base station receives channel parameters sent by the first user equipment;

generating a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm;

sending the first precoding matrix to the first user equipment;

receiving a second transmission signal sent by the second base station;

Obtaining a first signal to be transmitted according to the first transmission signal and the second transmission signal; wherein, the first transmission signal is a signal of the first base station;

Encoding the first signal to be transmitted by using the first precoding matrix to obtain a first encoded signal;

sending the first encoded signal, so that the first user equipment obtains the first transmitted signal according to a first received signal; wherein, the first received signal includes: the first encoded signal and a second encoded signal The second encoded signal is obtained by the second base station by using a second precoding matrix to encode the second signal to be transmitted; the second signal to be transmitted is obtained by the second base station.

In a first possible implementation manner, with reference to the third aspect, the generating the first precoding matrix of each data stream of the first user equipment according to the interference alignment algorithm includes:

Arbitrarily selecting an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer;

Acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-1th precoding vector of the second precoding matrix The coding vector is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; the i is a positive integer greater than 1.

In a fourth aspect, a signal transmission method is provided, including:

The first user equipment obtains channel parameters according to a channel estimation algorithm;

sending the channel parameters to the first base station;

receiving a first precoding matrix sent by the first base station;

Receiving a first coded signal sent by the first base station; wherein the first coded signal is obtained by the first base station using the first precoding matrix to code a first signal to be sent; the first The signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal;

Receiving a second encoded signal sent by the second base station; wherein the second encoded signal is obtained by encoding a second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted It is obtained by the second base station according to the first transmission signal and the second transmission signal; the second precoding matrix is generated by the second base station;

Obtain a processed signal according to the first received signal; wherein, the first received signal includes: the first coded signal and the second coded signal.

In a first possible implementation manner, with reference to the fourth aspect, after obtaining the processed signal according to the first received signal, the method further includes:

The processed signal is detected, and the first transmitted signal is obtained according to the first precoding matrix and the second precoding matrix.

In a second possible implementation manner, in combination with the fourth aspect or the first possible implementation manner, the first user equipment obtains channel parameters according to a channel estimation algorithm, including:

Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm;

The channel parameters are obtained according to the channel fading parameters.

In a fifth aspect, a first base station is provided, including:

an acquisition unit, configured to obtain channel parameters according to a channel estimation algorithm;

A generating unit, configured to generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; wherein the first precoding matrix is used to encode a first transmission signal;

a sending unit, configured to send the first precoding matrix to the first user equipment;

A receiving unit, configured to receive a first encoded signal sent by the first user equipment; wherein the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix;

The receiving unit is further configured to receive a second encoded signal sent by the second user equipment; wherein, the second encoded signal is obtained by the second user equipment encoding the second transmitted signal by using a second precoding matrix; the The second precoding matrix is generated by the second base station according to the interference alignment algorithm;

The detection unit is configured to detect the first received signal to obtain a first superimposed signal; wherein the first superimposed signal is a superposition of an interference signal of the first base station and a useful signal; the first received signal includes: said first encoded signal and said second encoded signal;

The receiving unit is further configured to receive a second superimposed signal sent by the second base station; wherein, the second superimposed signal is obtained by the second base station detecting a second received signal; the second received signal includes: said first coded signal and said second coded signal;

The obtaining unit is further configured to obtain a processed signal according to the first superimposed signal and the second superimposed signal.

In the first possible implementation manner, combined with the fifth aspect, it also includes:

A processing unit, configured to use sequence detection on the processed signal to obtain the first sent signal.

In the second possible implementation manner, in combination with the fifth aspect or the first possible implementation manner, the acquiring unit is specifically configured to:

Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm;

The channel parameters are obtained according to the channel fading parameters.

In a third possible implementation manner, in combination with the fifth aspect or the first possible implementation manner, the generation unit includes:

Selecting a subunit is used to arbitrarily select an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer;

An acquisition subunit, configured to acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-th precoding vector of the second precoding matrix The i-1 th precoding vector is acquired by the second base station according to the i-1 th precoding vector of the first precoding matrix; the i is a positive integer greater than 1.

In a sixth aspect, a first user equipment is provided, including:

A receiving unit, configured to receive a first precoding matrix sent by a first base station; wherein, the first precoding matrix is generated by the first base station and is used to encode a first transmitted signal;

a processing unit, configured to encode the first transmitted signal according to the first precoding matrix to obtain a first encoded signal;

a sending unit, configured to send the first encoded signal, so that the first base station obtains a signal without interference according to the first received signal; wherein, the first received signal includes: the first encoded signal and the second An encoded signal: the second encoded signal is obtained by the second user equipment by encoding the second transmitted signal according to a second pre-precoding matrix; the second pre-coding matrix is generated by the second base station.

In a seventh aspect, a first base station is provided, including:

a receiving unit, configured to receive channel parameters sent by the first user equipment;

A generating unit, configured to generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm;

a sending unit, configured to send the first precoding matrix to the first user equipment;

The receiving unit is further configured to receive a second transmission signal sent by the second base station;

An acquisition unit, configured to obtain a first signal to be transmitted according to the first transmission signal and the second transmission signal; wherein, the first transmission signal is a signal of the first base station;

a processing unit, configured to use the first precoding matrix to encode the first signal to be transmitted to obtain a first encoded signal;

The sending unit is further configured to send the first encoded signal, so that the first user equipment obtains the first sent signal according to the first received signal; wherein the first received signal includes: the first An encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is obtained by the second base station of.

In a first possible implementation manner, with reference to the seventh aspect, the generation unit includes:

Selecting a subunit is used to arbitrarily select an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer;

An acquisition subunit, configured to acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-th precoding vector of the second precoding matrix The i-1 th precoding vector is acquired by the second base station according to the i-1 th precoding vector of the first precoding matrix; the i is a positive integer greater than 1.

In an eighth aspect, a first user equipment is provided, including:

an acquisition unit, configured to obtain channel parameters according to a channel estimation algorithm;

a sending unit, configured to send the channel parameters to the first base station;

a receiving unit, configured to receive the first precoding matrix sent by the first base station;

The receiving unit is further configured to receive a first coded signal sent by the first base station; wherein the first coded signal is that the first base station uses the first precoding matrix to perform a first signal to be sent obtained by encoding; the first signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal;

The receiving unit is further configured to receive a second encoded signal sent by the second base station; wherein the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix The second signal to be transmitted is obtained by the second base station according to the first transmitted signal and the second transmitted signal; the second precoding matrix is generated by the second base station;

The obtaining unit is further configured to obtain a processed signal according to the first received signal; wherein the first received signal includes: the first coded signal and the second coded signal.

In a first possible implementation manner, with reference to the eighth aspect, the first user equipment further includes:

A processing unit, configured to detect the processed signal, and obtain the first transmitted signal according to the first precoding matrix and the second precoding matrix.

In the second possible implementation manner, in combination with the eighth aspect or the first possible implementation manner, the acquiring unit is specifically configured to:

Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm;

The channel parameters are obtained according to the channel fading parameters.

In a ninth aspect, a signal transmission system is provided, including: a first base station, a second base station, a first user equipment, and a second user equipment, where:

The first base station is the first base station described in the fifth aspect; the first user equipment is the first user equipment described in the sixth aspect;

The second base station is configured to send a second superimposed signal to the first base station; generate a second precoding matrix; wherein, the second superimposed signal is obtained by the second base station detecting a second received signal; the second received The signal includes: a first coded signal and a second coded signal;

The second user equipment is configured to send a second pre-coding matrix; encode a second transmitted signal according to the second pre-pre-coding matrix to obtain the second coded signal.

In a tenth aspect, a signal transmission system is provided, including: a first base station, a second base station, a first user equipment, and a second user equipment, wherein:

The first base station is the first base station described in the seventh aspect; the first user equipment is the first user equipment described in the eighth aspect;

The second base station is configured to send a second transmission signal to the first base station; send a second coded signal to the first user equipment; generate a second precoding matrix;

The second user equipment is configured to perform data transmission with a second base station.

In the signal transmission method, device and system provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, which avoids the channel in signal transmission. Interference, while reducing the pressure on the channel feedback.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic flowchart of a signal transmission method provided by an embodiment of the present invention;

FIG. 2 is a schematic flowchart of another signal transmission method provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of another signal transmission method provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of a signal transmission method provided by another embodiment of the present invention;

FIG. 5 is a schematic flowchart of another signal transmission method provided by another embodiment of the present invention;

FIG. 6 is a schematic flowchart of another signal transmission method provided by another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a first base station provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another first base station provided by an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of another first base station provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of another first user equipment provided by an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a first base station provided by another embodiment of the present invention;

FIG. 12 is a schematic structural diagram of another first base station provided by another embodiment of the present invention;

FIG. 13 is a schematic structural diagram of another first user equipment provided by an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a first user equipment provided by another embodiment of the present invention;

FIG. 15 is a schematic structural diagram of another first base station provided by another embodiment of the present invention;

FIG. 16 is a schematic structural diagram of another first user equipment provided by another embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a first base station provided by another embodiment of the present invention;

FIG. 18 is a schematic structural diagram of yet another first user equipment provided by another embodiment of the present invention;

FIG. 19 is a schematic structural diagram of a signal transmission system provided by an embodiment of the present invention;

FIG. 20 is a schematic structural diagram of another signal transmission system provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiments of the present invention provide a signal transmission method, as shown in FIG. 1 , comprising the following steps:

101. The first base station obtains channel parameters according to a channel estimation algorithm.

102. The first base station generates a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm.

Wherein, the first precoding matrix is used to encode the first transmitted signal.

103. The first base station sends the first precoding matrix to the first user equipment.

104. The first base station receives a first coded signal sent by the first user equipment.

Wherein, the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix.

105. The first base station receives the second coded signal sent by the second user equipment.

Wherein, the second encoded signal is obtained by encoding the second transmitted signal by using the second precoding matrix.

106. The first base station detects the first received signal to obtain a first superimposed signal.

Wherein, the first superposition signal is a superposition of an interference signal and a useful signal of the first base station; the first received signal includes: a first coded signal and a second coded signal.

107. The first base station receives the second superposition signal sent by the second base station.

Wherein, the second superposition signal is obtained by the second base station detecting the second received signal; the second received signal includes: the first coded signal and the second coded signal.

108. The first base station obtains a processed signal according to the first superimposed signal and the second superimposed signal.

In the signal transmission method provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced.

Embodiments of the present invention provide a signal transmission method, as shown in FIG. 2 , including the following steps:

201. The first user equipment receives a first precoding matrix sent by a first base station.

Wherein, the first precoding matrix is generated by the first base station, and is used to encode the first transmitted signal.

202. The first user equipment encodes the first transmitted signal according to the first precoding matrix to obtain a first encoded signal.

203. The first user equipment sends a first coded signal to the first base station, so that the first base station obtains a signal without interference according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second transmitted signal by the second user equipment according to the second pre-pre-coding matrix; the second pre-coding matrix is Generated by the second base station.

In the signal transmission method provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced.

Embodiments of the present invention provide a signal transmission method, as shown in FIG. 3 , including the following steps:

301. The first base station receives channel parameters sent by the first user equipment.

302. The first base station generates a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm.

303. The first base station sends the first precoding matrix to the first user equipment.

304. The first base station receives a second transmission signal sent by the second base station.

305. The first base station obtains a first signal to be sent according to the first sent signal and the second sent signal.

Wherein, the first sending signal is a signal of the first base station.

306. The first base station encodes the first signal to be sent by using the first precoding matrix to obtain a first encoded signal.

307. The first base station sends the first encoded signal to the first user equipment, so that the first user equipment obtains the first sent signal according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is the first obtained from the second base station.

In the signal transmission method provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced.

Embodiments of the present invention provide a signal transmission method, as shown in FIG. 4 , including the following steps:

401. The first user equipment obtains channel parameters according to a channel estimation algorithm.

402. The first user equipment sends channel parameters to the first base station.

403. The first user equipment receives the first precoding matrix sent by the first base station.

404. The first user equipment receives the first coded signal sent by the first base station.

Wherein, the first encoded signal is obtained by the first base station by using the first precoding matrix to encode the first signal to be transmitted; the first signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal.

405. The first user equipment receives the second coded signal sent by the second base station.

Wherein, the second encoded signal is obtained by the second base station by using the second precoding matrix to encode the second signal to be transmitted; the second signal to be transmitted is obtained by the second base station according to the first transmitted signal and the second transmitted signal; the second The second precoding matrix is generated by the second base station.

406. The first user equipment obtains a processed signal according to the first received signal, where the first received signal includes: a first coded signal and a second coded signal.

In the signal transmission method provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced.

An embodiment of the present invention provides a signal transmission method, which is applied in the signal uplink transmission process, wherein one user equipment transmits M independent data streams, and the other user equipment transmits M-1 data streams, as shown in FIG. 5 , Include the following steps:

501. The first base station obtains a channel fading parameter from the first base station to a user equipment corresponding to the first base station according to a channel estimation algorithm.

502. The first base station obtains channel parameters according to the channel fading parameters.

Specifically, in the embodiment of the present invention, the difference between the numbers of data streams respectively transmitted by the first user equipment and the second user equipment must be 1. In this embodiment, both the first base station and the first user equipment are configured with M antennas, and the second base station and the second user equipment are both configured with M−1 antennas. One data stream is transmitted on each antenna, and the first user equipment transmits M data streams, and the second user equipment transmits M-1 data streams as an example for illustration.

In this embodiment, the channel fading parameter from the kth antenna of the first base station to the nth antenna of the first user equipment is As an example to illustrate the specific steps of obtaining the channel parameters H _mm and H _mp according to the channel estimation algorithm: the first base station sends a pilot signal known in advance at both the transmitting end and the receiving end on the k-th antenna Therefore, the fading pilot signal received by the signal received on the nth antenna of the first user equipment is Wherein, n _mn is the noise vector on the nth antenna of the first user equipment, It is also the element of row k and column n of the channel fading parameter H _mm . right Divide by p _mk to get, which is equal to the noise perturbed Bundle as a pair estimate of . Similarly, channel parameter fading from each antenna of the first base station to each antenna of the first user equipment can be obtained through the above calculation method, and finally the channel fading parameter H _mm is obtained. Similarly, the channel fading parameter H _mp can be obtained through the above process. Further, the channel parameters are obtained according to the channel fading parameters

Through the same process as above, the second base station can obtain the channel fading parameters H _pm and H _pp from the second base station to the user equipment corresponding to the second base station, and then, can obtain the corresponding channel parameters according to H _pm and H _pp

503. The first base station arbitrarily selects an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix.

Wherein, M is a positive integer.

504. The first base station acquires the i-th precoding vector of the first precoding matrix according to the i-1 th precoding vector of the second precoding matrix.

Wherein, the i-1th precoding vector of the second precoding matrix is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; i is a positive integer greater than 1.

Specifically, when the first precoding vector v _m1 of the first precoding matrix V _m has been selected, the process of obtaining the first precoding matrix is:

According to the first precoding vector of the first precoding matrix, the first precoding vector v _p1 of the second precoding matrix V _p is obtained: make v _m1 and v _p1 aligned at the first base station, and obtain H _mm v _m1 =H _mp v _p1 . make according to It is obtained that v _p1 =T _m v _m1 .

According to the first precoding vector of the second precoding matrix, the second precoding vector v _m2 of the first precoding matrix is obtained: make v _p1 and v _m2 aligned at the second base station, and obtain H _pm v _m2 =H _pp v _p1 , let according to It is obtained that v _m2 = T _p v _p1 .

According to the above method, v _mi and v _pi are aligned at the first base station, and v _pi =T _m v _mi is obtained.

Aligning v _pi and v _m(i+1) at the second base station yields v _m(i+1) = T _p v _pi . Finally, v _mi =(T _m T _p ) ^i-1 v _m1 , i=1, 2,...M; v _pi =T _m (T _m T _p ) ^i-1 v _m1 , i=1, 2, ...M-1.

505. The first base station sends the first precoding matrix to the first user equipment.

506. The first user equipment receives the first precoding matrix sent by the first base station.

Wherein, the first precoding matrix is generated by the first base station, and is used to encode the first transmitted signal.

507. The first user equipment encodes the first transmitted signal according to the first precoding matrix to obtain a first encoded signal.

Specifically, the first encoded signal encoded by the first precoding matrix is V _m m _m ; where, m _m is the first transmitted signal of the first user equipment.

508. The first user equipment sends a first coded signal to the first base station, so that the first base station obtains a signal without interference according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second transmitted signal by the second user equipment according to the second pre-pre-coding matrix; the second pre-coding matrix is Generated by the second base station.

Specifically, the second coded signal encoded by the second precoding matrix is V _p m _p ; wherein, m _p is the second transmission signal of the second user equipment.

The first user equipment sends the first coded signal in a broadcast form. This implementation is just an example to illustrate that the first base station can receive the first coded signal sent by the first user equipment. Of course, any receiving device in this transmission system can receive the first coded signal, such as the second base station.

509. The first base station receives the first coded signal sent by the first user equipment.

Wherein, the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix.

510. The first base station receives a second encoded signal sent by the second user equipment.

Wherein, the second encoded signal is obtained by encoding the second transmitted signal by using the second precoding matrix; the second precoding matrix is generated by the second base station according to the interference alignment algorithm.

511. The first base station detects the first received signal to obtain a first superimposed signal.

Wherein, the first superposition signal is a superposition of an interference signal and a useful signal of the first base station.

Specifically, the first received signal y _m received by the first base station is y _m =H _mm V _m m _m +H _mp V _p m _p +n _m . Wherein, m _p is the second transmission signal of the second user equipment; n _m is a noise vector at the first user equipment. According to the first precoding matrix and the second precoding matrix obtained in step 504, the first received signal is obtained:

Similarly, according to the same calculation steps, the second received signal y _p received by the second base station can be obtained as y _p =H _pm V _m m _m +H _pp V _p m _p +n _p ; wherein, n _p is the second Noise vector at the user equipment. According to the first precoding matrix and the second precoding matrix obtained in step 504, the second received signal is obtained:

In practice, the first received signal received by the first base station also includes the noise signal of the first base station; the second received signal received by the second base station also includes the noise signal of the second base station. Therefore, the specific expressions of the signals received by the first base station and the second base station will contain noise signals n _m and n _p .

The first superposition signal is obtained by the first base station by adopting the zero-forcing detection or the minimum mean square error detection method in the y _m signal received by the first base station. Of course, it is not limited to only these two methods, and the user can according to the specific To select an appropriate detection method for the implementation environment, the first superimposed signal can be expressed as:

m _m1 +m _p1 ，m _m2 +m _p2 ，…，m _m(M-1) +m _p(M-1) ，m _pM

Specifically, the specific implementation process is described here by using the zero-forcing detection method to detect the first superimposed signal as an example:

Multiply the left side of the first received signal y _m by ((H _mm V _m ) ^H H _mm V _m ) ^-1 (H _mm V _m ) ^H to obtain,

in, is colored noise. The first superposition signal is obtained by setting each element in ((H _mm V _m ) ^H H _mm V _m ) ⁻¹ (H _mm V _m ) ^H y _m as its closest mapping value.

512. The first base station receives the second superposition signal sent by the second base station.

Wherein, the second superposition signal is obtained by the second base station detecting the second received signal; the second received signal includes: the first coded signal and the second coded signal.

Among them, the second base station uses the zero-forcing detection or the minimum mean square error detection method to detect the second superimposed signal. Of course, it is not limited to only these two methods, and the user can choose an appropriate detection method according to the specific implementation environment. Two superposition signals can be expressed as:

m _m1 ，m _m2 +m _p1 ，…，m _m(M-1) +m _p(M-2) ，m _mM +m _p(M-1)

The process of obtaining the second superimposed signal by using the zero-forcing detection method is the same as the process of obtaining the first superimposed signal by the first base station by using the zero-forcing detection method in step 512, and will not be repeated here.

513. The first base station obtains a processed signal according to the first superimposed signal and the second superimposed signal.

Specifically, subtract the 2nd, 3rd, ..., M components in the detection sequence of the second superimposed signal from the corresponding 1st, 2nd, 3rd, ..., M-1 components in the detection sequence of the first superimposed signal . can get:

m _m1 -m _m2 , m _m2 -m _m3 ,..., m _m(M-1) -m _mM , m _mM

Certainly, the second base station may also use the first superimposed signal and the second superimposed signal. To obtain the processing signal, the specific steps are:

The 2nd, 3rd, ..., M components in the detection sequence of the first superimposed signal are correspondingly subtracted from the 2nd, 3rd, ..., M components in the detection sequence of the second superimposed signal. can get:

m _p1 -m _p2 , m _p2 -m _p3 ,..., m _pM-2) -m _p(M-1) , m _p(M-1)

At this time, only the first transmission signal of the first base station is included in the processed first superposition signal, and the interference signals from other base stations are completely eliminated. Moreover, only the second transmission signal of the second base station is included in the processed second superposition signal, and interference signals from other base stations are completely eliminated. In this way, the transmitted signal obtained by the receiving end is only the signal required by the receiving end, which improves the efficiency of receiving signals at the receiving end and increases the ratio of signal to noise at the receiving end. At the same time, since only two precoding matrices need to be fed back in the embodiment of the present invention, compared with the prior art, the channel information to be fed back is reduced by 50%, and the pressure on channel feedback is relieved.

514. The first base station uses sequence detection on the processed signal to obtain a first sent signal.

Specifically, serial interference cancellation or a Vibit algorithm may be used to recover and obtain the first transmitted signal, or an appropriate method may be used to recover and obtain the first transmitted signal according to a specific implementation environment.

Here, take serial interference cancellation as an example to specifically illustrate the process of recovering and obtaining the first transmitted signal m _m : in step 513, the first base station obtains the Mth sequence of the first superimposed signal and the second superimposed signal The element is m _mM , where m _mM is the Mth element of the first transmitted signal m _m . Therefore, the Mth element of the first transmitted signal m _m can be obtained. Then add the Mth element and the M-1th element in the processed signal sequence obtained by the first base station to obtain m _m(M-1) . Therefore, the M-1th element m _m(M-1) of the first sent signal m _m can be recovered. Through the same method, all elements of the first transmitted signal can be recovered finally.

Of course, the second base station may detect the processed signal to obtain the second transmitted signal by adopting the same method as the first base station detects the processed signal to obtain the first transmitted signal. Wherein, the process of the second base station recovering the second transmission signal by using serial interference cancellation is exactly the same as the process of the first base station recovering the first transmission signal by using serial interference cancellation, which will not be repeated here.

In the signal transmission method provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a signal transmission method, which is applied in the signal downlink transmission process, as shown in FIG. 6 , including the following steps:

601. The first user equipment obtains channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm.

602. The first user equipment obtains channel parameters according to the channel fading parameters.

Specifically, the specific process for the first user equipment to obtain the channel parameters according to the channel estimation algorithm is the same as the implementation process for the first base station to obtain the channel parameters in steps 501-502 in the above embodiment, and will not be repeated here.

603. The first user equipment sends channel parameters to the first base station.

604. The first base station receives channel parameters sent by the first user equipment.

605. The first base station arbitrarily selects an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix.

Wherein, M is a positive integer.

606. The first base station acquires the i-th precoding vector of the first precoding matrix according to the i-1 th precoding vector of the second precoding matrix.

Wherein, the i-1th precoding vector of the second precoding matrix is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; i is a positive integer greater than 1.

Specifically, for the process of obtaining the first precoding matrix by the first base station, refer to the process in step 504 in the foregoing embodiment, and details are not repeated here. Of course, the second base station can obtain the second precoding matrix at the same time by adopting the same process as step 504 in the above embodiment.

607. The first base station sends the first precoding matrix to the first user equipment.

608. The first user equipment receives the first precoding matrix sent by the first base station.

609. The first base station receives the second transmission signal sent by the second base station.

610. The first base station obtains a first signal to be sent according to the first sent signal and the second sent signal.

Wherein, the first sending signal is a signal of the first base station.

Specifically, the first, 2, 3, ..., M-1 components in the detection sequence of the first transmission signal are used to subtract the first, 2, 3, ..., M components in the detection sequence of the second transmission signal. -1 serving. can get:

Certainly, the specific process of obtaining the second signal to be transmitted by the second base station through processing is as follows:

The 2nd, 3rd, ..., M components in the detection sequence of the first transmission signal are correspondingly subtracted from the 1st, 2nd, 3rd, ..., M-1 components in the detection sequence of the second transmission signal. can get:

611. The first base station encodes the first signal to be sent by using the first precoding matrix to obtain a first encoded signal.

The first encoded signal generated after encoding the first signal to be sent is:

Through the same implementation process, the second base station uses the second precoding matrix to encode the second signal to be transmitted to obtain the second encoded signal as

The final processed signal is:

m _m1 -m _m2 , m _m2 -m _m3 ,..., m _m(M-1) -m _mM , m _mM

m _m1 -m _p1 , m _p1 -m _p2 , m _p2 -m _p3 ,..., m _pM-2) -m _p(M-1) , m _p(M-1)

It can be seen that the interference signal in the signal received by the first user equipment is completely eliminated, and there are only signals that need to be detected by the first user equipment. Except for the signal received by the second user equipment in the first dimension, the interference signals in other dimensions are completely eliminated, and there are only M−1 data streams that need to be detected. In this way, interference signals from other user equipments in the signal received by the receiving end can be greatly reduced. The interference signal in the received signal is reduced.

612. The first base station sends the first encoded signal to the first user equipment, so that the first user equipment obtains the first sent signal according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is the first obtained from the second base station. The second signal to be sent is obtained by the second base station according to the first sent signal and the second sent signal.

The first base station sends the first coded signal in the form of broadcasting. During the specific implementation process, any receiver in the communication system can receive the first coded signal, such as the first coded signal in the embodiment of the present invention second base station.

613. The first user equipment receives the first coded signal sent by the first base station.

614. The first user equipment receives the second coded signal sent by the second base station.

615. The first user equipment obtains a processed signal according to the first received signal.

616. The first user equipment detects the processed signal, and obtains the first transmitted signal according to the first precoding matrix and the second precoding matrix.

Specifically, zero-forcing detection and minimum mean square error detection methods may be used to restore and obtain the first transmitted signal. Of course, it is not limited to these two methods, and a suitable detection method can be selected according to actual needs in specific implementation.

Of course, the second user equipment can recover and obtain the second sent signal through the same method.

In the signal transmission method provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first base station 7, as shown in FIG. 7 , including: an acquiring unit 71, a generating unit 72, a sending unit 73, a receiving unit 74, and a detecting unit 75, wherein:

The obtaining unit 71 is configured to obtain channel parameters according to a channel estimation algorithm.

The generating unit 72 is configured to generate a first precoding matrix of each data stream of the first user equipment according to an interference alignment algorithm.

Wherein, the first precoding matrix is used to encode the first transmitted signal.

The sending unit 73 is configured to send the first precoding matrix to the first user equipment.

The receiving unit 74 is configured to receive the first coded signal sent by the first user equipment.

Wherein, the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix.

The receiving unit 74 is further configured to receive a second coded signal sent by the second user equipment.

Wherein, the second coded signal is obtained by the second user equipment by using the second precoding matrix to code the second transmission signal; the second precoding matrix is generated by the second base station according to the interference alignment algorithm.

The detecting unit 75 is configured to detect the first received signal to obtain a first superimposed signal.

Wherein, the first superposition signal is a superposition of an interference signal and a useful signal of the first base station; the first received signal includes: a first coded signal and a second coded signal.

The receiving unit 74 is further configured to receive the second superposition signal sent by the second base station.

Wherein, the second superposition signal is obtained by the second base station detecting the second received signal; the second received signal includes: the first coded signal and the second coded signal.

The obtaining unit 71 is further configured to obtain a processed signal according to the first superimposed signal and the second superimposed signal.

In the first base station provided by the embodiment of the present invention, by using precoded signals, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain manner, and joint detection is performed, thereby avoiding interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced.

Further, referring to FIG. 8 , the first base station 7 provided by the embodiment of the present invention further includes: a processing unit 76, wherein:

The processing unit 76 is configured to use sequence detection on the processed signal to obtain the first sent signal.

Further, the obtaining unit 71 of the first base station is specifically used for:

According to the channel estimation algorithm, channel fading parameters from the first base station to the user equipment corresponding to the first base station are obtained.

According to the channel fading parameters, the channel parameters are obtained.

Further, referring to FIG. 9, the generation unit 72 of the first base station includes: a selection subunit 721 and an acquisition subunit 722, wherein:

The selecting subunit 721 is configured to arbitrarily select an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix.

Wherein, M is a positive integer.

The acquiring subunit 722 is configured to acquire the i-th precoding vector of the first precoding matrix according to the i-1 th precoding vector of the second precoding matrix.

Wherein, the i-1th precoding vector of the second precoding matrix is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; i is a positive integer greater than 1.

In the first base station provided by the embodiment of the present invention, by using precoded signals, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain manner, and joint detection is performed, thereby avoiding interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first user equipment 8, as shown in FIG. 10 , including: a receiving unit 81, a processing unit 82, and a sending unit 83, wherein:

The receiving unit 81 is configured to receive the first precoding matrix sent by the first base station.

Wherein, the first precoding matrix is generated by the first base station, and is used to encode the first transmitted signal.

The processing unit 82 is configured to encode the first transmitted signal according to the first precoding matrix to obtain a first encoded signal.

The sending unit 83 is configured to send the first coded signal to the first base station, so that the first base station obtains a signal without interference according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second transmitted signal by the second user equipment according to the second pre-pre-coding matrix; the second pre-coding matrix is Generated by the second base station.

In the first user equipment provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, thereby avoiding interference between channels in signal transmission , while reducing the pressure on channel feedback. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first base station 9, as shown in FIG. 11 , including: a receiving unit 91, a generating unit 92, a sending unit 93, an acquiring unit 94, and a processing unit 95, wherein:

The receiving unit 91 is configured to receive channel parameters sent by the first user equipment.

The generating unit 92 is configured to generate a first precoding matrix of each data stream of the first user equipment according to an interference alignment algorithm.

The sending unit 93 is configured to send the first precoding matrix to the first user equipment.

The receiving unit 94 is further configured to receive a second transmission signal sent by the second base station.

The obtaining unit 95 is configured to obtain a first signal to be sent according to the first sending signal and the second sending signal.

Wherein, the first sending signal is a signal of the first base station.

The processing unit 96 is configured to use the first precoding matrix to encode the first signal to be sent to obtain a first encoded signal.

The sending unit 93 is further configured to send the first encoded signal to the first user equipment, so that the first user equipment obtains the first sent signal according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is the first obtained from the second base station.

In the first base station provided by the embodiment of the present invention, by using precoded signals, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain manner, and joint detection is performed, thereby avoiding interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced.

Further, referring to FIG. 12 , the generation unit 92 of the first base station also includes: a selection subunit 921 and an acquisition subunit 922, wherein:

The selecting subunit 921 is configured to arbitrarily select an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix.

Wherein, M is a positive integer.

The acquiring subunit 922 is configured to acquire the i-th precoding vector of the first precoding matrix according to the i-1 th precoding vector of the second precoding matrix.

Wherein, the i-1th precoding vector of the second precoding matrix is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; i is a positive integer greater than 1.

In the first base station provided by the embodiment of the present invention, by using precoded signals, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain manner, and joint detection is performed, thereby avoiding interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first user equipment 10, as shown in FIG. 13 , including an acquiring unit 1001, a sending unit 1002, and a receiving unit 1003, wherein:

The obtaining unit 1001 is configured to obtain channel parameters according to a channel estimation algorithm.

A sending unit 1002, configured to send channel parameters to the first base station.

The receiving unit 1003 is configured to receive the first precoding matrix sent by the first base station.

The receiving unit 1003 is further configured to receive the first coded signal sent by the first base station.

Wherein, the first encoded signal is obtained by the first base station by using the first precoding matrix to encode the first signal to be transmitted; the first signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal.

The receiving unit 1003 is further configured to receive a second coded signal sent by the second base station.

Wherein, the second encoded signal is obtained by the second base station by using the second precoding matrix to encode the second signal to be transmitted; the second signal to be transmitted is obtained by the second base station according to the first transmitted signal and the second transmitted signal; the second The second precoding matrix is generated by the second base station.

The obtaining unit 1001 is further configured to obtain a processed signal according to the first received signal.

Wherein, the first received signal includes: a first coded signal and a second coded signal.

In the first user equipment provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, thereby avoiding interference between channels in signal transmission , while reducing the pressure on channel feedback.

Further, referring to FIG. 14, the first user equipment further includes: a processing unit 1004, where:

The processing unit 1004 is configured to detect the processed signal, and obtain the first transmitted signal according to the first precoding matrix and the second precoding matrix.

Further, the obtaining unit 1001 is specifically used for:

According to the channel estimation algorithm, channel fading parameters from the first base station to the user equipment corresponding to the first base station are obtained.

According to the channel fading parameters, the channel parameters are obtained.

In the first user equipment provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, which reduces the interference between channels in signal transmission , while reducing the pressure on channel feedback. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first base station 11, as shown in FIG. The bus 1104 is connected and completes mutual communication, and the memory 1101 is used to store program codes, wherein:

The bus 1104 may be an Industry Standard Architecture (Industry Standard Architecture, ISA for short) bus, a Peripheral Component Interconnect (PCI for short) bus, or an Extended Industry Standard Architecture (EISA for short). bus etc. The bus 1104 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 15 , but it does not mean that there is only one bus or one type of bus. in:

The memory 1102 is used to store program codes including operation instructions. The memory 1102 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.

Processor 1101 may be a central processing unit (Central Processing Unit, referred to as CPU), or a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or configured to implement one or more of the embodiments of the present invention integrated circuit.

The communication interface 1103 is mainly used to implement communication between devices in this embodiment.

The processor 1101 is further configured to call the program code in the memory 1102 to perform the following operations:

According to the channel estimation algorithm, the channel parameters are obtained.

Generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm.

Wherein, the first precoding matrix is used to encode the first transmitted signal.

Send the first precoding matrix to the first user equipment.

Receive a first coded signal sent by the first user equipment. Wherein, the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix.

Receive a second coded signal sent by the second user equipment.

Wherein, the second coded signal is obtained by the second user equipment by using the second precoding matrix to code the second transmission signal; the second precoding matrix is generated by the second base station according to the interference alignment algorithm.

The first received signal is detected to obtain a first superimposed signal.

Wherein, the first superposition signal is a superposition of an interference signal and a useful signal of the first base station; the first received signal includes: a first coded signal and a second coded signal.

Receive a second superposition signal sent by the second base station.

Wherein, the second superposition signal is obtained by the second base station detecting the second received signal; the second received signal includes: the first coded signal and the second coded signal.

Based on the first superimposed signal and the second superimposed signal, a processed signal is obtained.

Further, the processor 1101 is further configured to use sequence detection on the processed signal to obtain the first sent signal.

Further, the processor 1101 is specifically used for:

According to the channel estimation algorithm, channel fading parameters from the first base station to the user equipment corresponding to the first base station are obtained.

According to the channel fading parameters, the channel parameters are obtained.

Further, the processor 1101 is specifically used for:

An M-dimensional column vector whose components are not zero is arbitrarily selected as the first precoding vector of the first precoding matrix. Wherein, M is a positive integer.

Acquire the i-th precoding vector of the first precoding matrix according to the i-1 th precoding vector of the second precoding matrix.

Wherein, the i-1th precoding vector of the second precoding matrix is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; i is a positive integer greater than 1.

In the first base station provided by the embodiment of the present invention, by using precoded signals, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain manner, and joint detection is performed, thereby avoiding interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first user equipment 12, as shown in FIG. Connect and complete mutual communication through the bus 1204, the memory 1201 is used to store program codes, wherein:

The bus 1204 may be an Industry Standard Architecture (ISA for short) bus, a Peripheral Component Interconnect (PCI for short) bus or an Extended Industry Standard Architecture (EISA for short) bus etc. The bus 1204 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 16 , but it does not mean that there is only one bus or one type of bus. in:

The memory 1202 is used to store program codes including operation instructions. The memory 1202 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.

Processor 1201 may be a central processing unit (Central Processing Unit, referred to as CPU), or a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or configured to implement one or more of the embodiments of the present invention integrated circuit.

The communication interface 1203 is mainly used to implement communication between devices in this embodiment.

The processor 1201 is further configured to call the program code in the memory 1202 to perform the following operations:

Receive the first precoding matrix sent by the first base station.

Wherein, the first precoding matrix is generated by the first base station, and is used to encode the first transmitted signal.

Encode the first transmitted signal according to the first precoding matrix to obtain a first encoded signal.

Sending the first coded signal to the first base station, so that the first base station obtains a signal without interference according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second transmitted signal by the second user equipment according to the second pre-pre-coding matrix; the second pre-coding matrix is Generated by the second base station.

In the first user equipment provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, thereby avoiding interference between channels in signal transmission , while reducing the pressure on channel feedback. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first base station 13, as shown in FIG. The bus 1304 is connected and communicates with each other, and the memory 1301 is used to store program codes, wherein:

The bus 1304 may be an Industry Standard Architecture (Industry Standard Architecture, ISA for short) bus, a Peripheral Component Interconnect (PCI for short) bus, or an Extended Industry Standard Architecture (EISA for short). bus etc. The bus 1304 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 17 , but it does not mean that there is only one bus or one type of bus. in:

The memory 1302 is used to store program codes including operation instructions. The memory 1302 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

Processor 1301 may be a central processing unit (Central Processing Unit, referred to as CPU), or a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or configured to implement one or more of the embodiments of the present invention integrated circuit.

The communication interface 1303 is mainly used to implement communication between devices in this embodiment.

The processor 1301 is further configured to call the program code in the memory 1302 to perform the following operations:

Receive channel parameters sent by the first user equipment.

Generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm.

Send the first precoding matrix to the first user equipment.

Receive a second transmission signal sent by the second base station.

According to the first sending signal and the second sending signal, a first signal to be sent is obtained. Wherein, the first sending signal is a signal of the first base station.

The first signal to be sent is encoded by using the first precoding matrix to obtain a first encoded signal.

Sending the first encoded signal to the first user equipment, so that the first user equipment obtains the first sent signal according to the first received signal.

Wherein, the first received signal includes: a first encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is the first obtained from the second base station.

Further, the processor 1301 is specifically used for:

An M-dimensional column vector whose components are not zero is arbitrarily selected as the first precoding vector of the first precoding matrix.

Wherein, M is a positive integer.

Acquire the i-th precoding vector of the first precoding matrix according to the i-1 th precoding vector of the second precoding matrix.

Wherein, the i-1th precoding vector of the second precoding matrix is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; i is a positive integer greater than 1.

In the first base station provided by the embodiment of the present invention, by using precoded signals, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain manner, and joint detection is performed, thereby avoiding interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a first user equipment 14, as shown in FIG. Connect and complete the mutual communication through the bus 1404, the memory 1401 is used to store the program code, wherein:

The bus 1404 may be an Industry Standard Architecture (Industry Standard Architecture, ISA for short) bus, a Peripheral Component Interconnect (PCI for short) bus, or an Extended Industry Standard Architecture (EISA for short). bus etc. The bus 1404 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 18 , but it does not mean that there is only one bus or one type of bus. in:

The memory 1402 is used to store program codes including operation instructions. The memory 1402 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

Processor 1401 may be a central processing unit (Central Processing Unit, referred to as CPU), or a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or configured to implement one or more of the embodiments of the present invention integrated circuit.

The communication interface 1403 is mainly used to implement communication between devices in this embodiment.

The processor 1401 is also used to call the program code in the memory 1402 to perform the following operations:

According to the channel estimation algorithm, the channel parameters are obtained.

Send channel parameters to the first base station.

Receive the first precoding matrix sent by the first base station.

Receive a first coded signal sent by the first base station.

Wherein, the first encoded signal is obtained by encoding the first signal to be transmitted by using the first precoding matrix; the first signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal.

Receive a second coded signal sent by the second base station.

Wherein, the second encoded signal is obtained by the second base station by using the second precoding matrix to encode the second signal to be transmitted; the second signal to be transmitted is obtained by the second base station according to the first transmitted signal and the second transmitted signal; the second The second precoding matrix is generated by the second base station.

Obtain a processed signal according to the first received signal; wherein, the first received signal includes: a first coded signal and a second coded signal.

Further, the processor 1401 is further configured to detect the processed signal, and obtain the first transmitted signal according to the first precoding matrix and the second precoding matrix.

Further, the processor 1401 is specifically used for:

According to the channel estimation algorithm, channel fading parameters from the first base station to the user equipment corresponding to the first base station are obtained.

According to the channel fading parameters, the channel parameters are obtained.

In the first user equipment provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, thereby avoiding interference between channels in signal transmission , while reducing the pressure on channel feedback. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a signal transmission system, as shown in FIG. 19 , including: a first base station a, a second base station b, a first user equipment c, and a second user equipment d, where:

The first base station a is any first base station in the embodiments corresponding to FIGS. 7 to 9 ; the first user equipment c is the first user equipment in the embodiment corresponding to FIG. 10 .

Or, the first base station a is the first base station in the embodiment corresponding to FIG. 15 ; the first user equipment c is the first user equipment in the embodiment corresponding to FIG. 16 .

The second base station b is configured to send the second superposition signal to the first base station a; and generate a second precoding matrix. Wherein, the second superposition signal is obtained by the second base station detecting the second received signal; the second received signal includes: the first coded signal and the second coded signal.

The second user equipment d is configured to send the second precoding matrix to the first base station. Encode the second transmitted signal according to the second pre-precoding matrix to obtain a second encoded signal.

In the signal transmission system provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed to avoid interference between channels during signal transmission. At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

An embodiment of the present invention provides a signal transmission system, as shown in FIG. 20 , including: a first base station e, a second base station f, a first user equipment g, and a second user equipment h, wherein:

The first base station e is the first base station in the embodiment corresponding to FIG. 11 or 12 ; the first user equipment g is the first user equipment in the embodiment corresponding to FIG. 13 or 14 .

Or, the first base station e is the first base station in the embodiment corresponding to FIG. 17 ; the first user equipment g is the first user equipment in the embodiment corresponding to FIG. 18 .

The second base station f is configured to send the second transmission signal to the first base station e; send the second coded signal to the first user equipment g; and generate a second precoding matrix.

The second user equipment g is configured to perform data transmission with the second base station f.

In the signal transmission system provided by the embodiments of the present invention, by using the precoded signal, the interference signal and the useful signal are aligned on a specific dimension at the receiving end in a certain way, and joint detection is performed, which reduces the interference between channels in signal transmission, At the same time, the pressure on channel feedback is reduced. Furthermore, the reception efficiency of the received signal can be improved.

Those skilled in the art can clearly understand that for the convenience and brevity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to needs. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the above-described system, device, and unit, reference may be made to the corresponding process in the foregoing method embodiments, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the Including the steps of the foregoing method embodiments; and the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM for short), random access memory (Random Access Memory, RAM for short), magnetic disk or CDs and other media that can store program codes.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the application. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (22)

1. A signal transmission method, characterized in that, comprising: The first base station obtains channel parameters according to a channel estimation algorithm; Generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; wherein the first precoding matrix is used to encode a first transmission signal; sending the first precoding matrix to the first user equipment; Receive a first encoded signal sent by the first user equipment; wherein, the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix; Receiving a second encoded signal sent by the second user equipment; wherein, the second encoded signal is obtained by encoding the second transmitted signal by using a second precoding matrix; the second precoding matrix is obtained by the second base station according to interference alignment algorithmically generated; Detecting the first received signal to obtain a first superimposed signal; wherein the first superimposed signal is a superposition of an interference signal of the first base station and a useful signal; the first received signal includes: the first code signal and said second encoded signal; receiving a second superimposed signal sent by the second base station; wherein, the second superimposed signal is obtained by the second base station detecting a second received signal; the second received signal includes: the first coded signal and the a second encoded signal; Obtain a processed signal according to the first superimposed signal and the second superimposed signal. 2. The method according to claim 1, wherein, after obtaining the processed signal according to the first superimposed signal and the second superimposed signal, further comprising: Sequence detection is used on the processed signal to obtain the first sent signal. 3. The method according to claim 1 or 2, wherein the first base station obtains channel parameters according to a channel estimation algorithm, including: Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm; The channel parameters are obtained according to the channel fading parameters. 4. The method according to claim 1 or 2, wherein the generating the first precoding matrix of each data stream of the first user equipment according to the interference alignment algorithm comprises: Arbitrarily selecting an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer; Acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-1th precoding vector of the second precoding matrix The coding vector is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; the i is a positive integer greater than 1. 5. A signal transmission method, characterized in that, comprising: The first user equipment receives the first precoding matrix sent by the first base station; wherein, the first precoding matrix is generated by the first base station according to an interference alignment algorithm, and is used to encode the first transmitted signal; Encode the first transmitted signal according to the first precoding matrix to obtain a first encoded signal; sending the first coded signal so that the first base station obtains a signal without interference according to the first received signal; wherein the first received signal includes: the first coded signal and the second coded signal; the The second encoded signal is obtained by the second user equipment encoding the second transmitted signal according to the second precoding matrix; the second precoding matrix is generated by the second base station. 6. A signal transmission method, characterized in that, comprising: The first base station receives channel parameters sent by the first user equipment; generating a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; sending the first precoding matrix to the first user equipment; receiving a second transmission signal sent by the second base station; Obtaining a first signal to be transmitted according to the first transmission signal and the second transmission signal; wherein, the first transmission signal is a signal of the first base station; Encoding the first signal to be transmitted by using the first precoding matrix to obtain a first encoded signal; sending the first encoded signal, so that the first user equipment obtains the first transmitted signal according to a first received signal; wherein, the first received signal includes: the first encoded signal and a second encoded signal The second encoded signal is obtained by the second base station by using a second precoding matrix to encode the second signal to be transmitted; the second signal to be transmitted is obtained by the second base station. 7. The method according to claim 6, wherein the generating the first precoding matrix of each data stream of the first user equipment according to the interference alignment algorithm comprises: Arbitrarily selecting an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer; Acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-1th precoding vector of the second precoding matrix The coding vector is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; the i is a positive integer greater than 1. 8. A signal transmission method, characterized in that, comprising: The first user equipment obtains channel parameters according to a channel estimation algorithm; sending the channel parameters to the first base station; receiving a first precoding matrix sent by the first base station; Receiving a first coded signal sent by the first base station; wherein the first coded signal is obtained by the first base station using the first precoding matrix to code a first signal to be sent; the first The signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal; Receiving a second encoded signal sent by a second base station; wherein, the second encoded signal is obtained by encoding a second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is obtained by the second base station according to the first transmission signal and the second transmission signal; the second precoding matrix is generated by the second base station; Obtain a processed signal according to the first received signal; wherein, the first received signal includes: the first coded signal and the second coded signal. 9. The method according to claim 8, characterized in that, after obtaining the processed signal according to the first received signal, further comprising: The processed signal is detected, and the first transmitted signal is obtained according to the first precoding matrix and the second precoding matrix. 10. The method according to claim 8 or 9, wherein the first user equipment obtains channel parameters according to a channel estimation algorithm, including: Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm; The channel parameters are obtained according to the channel fading parameters. 11. A first base station, characterized in that it comprises: an acquisition unit, configured to obtain channel parameters according to a channel estimation algorithm; A generating unit, configured to generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; wherein the first precoding matrix is used to encode a first transmission signal; a sending unit, configured to send the first precoding matrix to the first user equipment; A receiving unit, configured to receive a first encoded signal sent by the first user equipment; wherein the first encoded signal is obtained by encoding the first transmitted signal by using the first precoding matrix; The receiving unit is further configured to receive a second encoded signal sent by the second user equipment; wherein, the second encoded signal is obtained by the second user equipment encoding the second transmitted signal by using a second precoding matrix; the The second precoding matrix is generated by the second base station according to the interference alignment algorithm; The detection unit is configured to detect the first received signal to obtain a first superimposed signal; wherein the first superimposed signal is a superposition of an interference signal of the first base station and a useful signal; the first received signal includes: said first encoded signal and said second encoded signal; The receiving unit is further configured to receive a second superimposed signal sent by the second base station; wherein, the second superimposed signal is obtained by the second base station detecting a second received signal; the second received signal includes: said first coded signal and said second coded signal; The obtaining unit is further configured to obtain a processed signal according to the first superimposed signal and the second superimposed signal. 12. The first base station according to claim 11, further comprising: A processing unit, configured to use sequence detection on the processed signal to obtain the first sent signal. 13. The first base station according to claim 11 or 12, wherein the acquiring unit is specifically configured to: Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm; The channel parameters are obtained according to the channel fading parameters. 14. The first base station according to claim 11 or 12, wherein the generating unit comprises: Selecting a subunit is used to arbitrarily select an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer; to obtain a subunit, use Obtaining the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-1th precoding vector of the second precoding matrix The precoding vector is obtained by the second base station according to the i-1th precoding vector of the first precoding matrix; the i is a positive integer greater than 1. 15. A first user equipment, characterized by comprising: A receiving unit, configured to receive a first precoding matrix sent by the first base station; wherein the first precoding matrix is generated by the first base station according to an interference alignment algorithm, and is used to encode the first transmitted signal; a processing unit, configured to encode the first transmitted signal according to the first precoding matrix to obtain a first encoded signal; a sending unit, configured to send the first encoded signal, so that the first base station obtains a signal without interference according to the first received signal; wherein, the first received signal includes: the first encoded signal and the second An encoded signal: the second encoded signal is obtained by the second user equipment by encoding the second transmitted signal according to the second precoding matrix; the second precoding matrix is generated by the second base station. 16. A first base station, characterized by comprising: a receiving unit, configured to receive channel parameters sent by the first user equipment; A generating unit, configured to generate a first precoding matrix for each data stream of the first user equipment according to an interference alignment algorithm; a sending unit, configured to send the first precoding matrix to the first user equipment; The receiving unit is further configured to receive a second transmission signal sent by the second base station; An acquisition unit, configured to obtain a first signal to be transmitted according to the first transmission signal and the second transmission signal; wherein, the first transmission signal is a signal of the first base station; a processing unit, configured to use the first precoding matrix to encode the first signal to be transmitted to obtain a first encoded signal; The sending unit is further configured to send the first encoded signal, so that the first user equipment obtains the first sent signal according to the first received signal; wherein the first received signal includes: the first An encoded signal and a second encoded signal; the second encoded signal is obtained by encoding the second signal to be transmitted by the second base station using a second precoding matrix; the second signal to be transmitted is obtained by the second base station of. 17. The first base station according to claim 16, wherein the generating unit comprises: Selecting a subunit is used to arbitrarily select an M-dimensional column vector whose components are not zero as the first precoding vector of the first precoding matrix; wherein, the M is a positive integer; An acquisition subunit, configured to acquire the i-th precoding vector of the first precoding matrix according to the i-1th precoding vector of the second precoding matrix; wherein, the i-th precoding vector of the second precoding matrix The i-1 th precoding vector is acquired by the second base station according to the i-1 th precoding vector of the first precoding matrix; the i is a positive integer greater than 1. 18. A first user equipment, characterized by comprising: an acquisition unit, configured to obtain channel parameters according to a channel estimation algorithm; a sending unit, configured to send the channel parameters to the first base station; a receiving unit, configured to receive the first precoding matrix sent by the first base station; The receiving unit is further configured to receive a first coded signal sent by the first base station; wherein the first coded signal is that the first base station uses the first precoding matrix to perform a first signal to be sent obtained by encoding; the first signal to be transmitted is obtained by the first base station according to the first transmitted signal and the second transmitted signal; The receiving unit is further configured to receive a second encoded signal sent by a second base station; wherein the second encoded signal is obtained by encoding a second signal to be transmitted by the second base station using a second precoding matrix; The second signal to be transmitted is obtained by the second base station according to the first transmitted signal and the second transmitted signal; the second precoding matrix is generated by the second base station; The obtaining unit is further configured to obtain a processed signal according to the first received signal; wherein the first received signal includes: the first coded signal and the second coded signal. 19. The first user equipment according to claim 18, wherein the first user equipment further comprises: A processing unit, configured to detect the processed signal, and obtain the first transmitted signal according to the first precoding matrix and the second precoding matrix. 20. The first user equipment according to claim 18 or 19, wherein the acquiring unit is specifically configured to: Obtaining channel fading parameters from the first base station to the user equipment corresponding to the first base station according to a channel estimation algorithm; The channel parameters are obtained according to the channel fading parameters. 21. A signal transmission system, characterized by comprising: a first base station, a second base station, a first user equipment, and a second user equipment, wherein: The first base station is the first base station described in any one of claims 11-14; the first user equipment is the first user equipment described in claim 15; The second base station is configured to send a second superimposed signal to the first base station; generate a second precoding matrix; wherein, the second superimposed signal is obtained by the second base station detecting a second received signal; the second received The signal includes: a first coded signal and a second coded signal; The second user equipment is configured to send a second precoding matrix; encode a second transmitted signal according to the second precoding matrix to obtain the second coded signal. 22. A signal transmission system, characterized by comprising: a first base station, a second base station, a first user equipment, and a second user equipment, wherein: The first base station is the first base station described in claim 16 or 17; the first user equipment is the first user equipment described in any one of claims 18-20; The second base station is configured to send a second transmission signal to the first base station; send a second coded signal to the first user equipment; generate a second precoding matrix; The second user equipment is configured to perform data transmission with a second base station.