CN108259145A - A data transmission method, sending device and receiving device - Google Patents

Abstract

The invention relates to the technical field of communication, in particular to a data transmission method, a sending device and a receiving device, which comprise: the method comprises the steps that a sending end transmits R data streams to a receiving end on M antenna groups, and S PRTS is sent to the receiving end, wherein each PTRS is transmitted from K antenna groups with the same phase noise in the M antenna groups after being precoded, and M R DMRS are sent to the receiving end, and each DMRS is transmitted from one antenna group after being precoded, wherein the phase noise of antenna ports in the same group is the same.

Description

A data transmission method, sending device and receiving device

technical field

The present invention relates to the technical field of communication, and in particular to a data transmission method, a sending device and a receiving device.

Background technique

The phase noise comes from local oscillators in a transmitting device (such as a transmitter) and a receiving device (such as a receiver), which will affect the transmission of multi-carrier signals. In the high frequency band (above 6GHz), the impact of phase noise will be more serious, and it is necessary to compensate the phase noise of the received signal to ensure system performance. By introducing a phase tracking reference signal (Phrase Tracking Reference Signal, PTRS) at the transmitting end, the phase change caused by phase noise can be tracked, so that the receiving end can estimate the phase noise of the link and compensate the received signal.

Since the Long Term Evolution (LTE) system is applied in a low frequency band, there is no corresponding phase tracking reference signal design. In the released 5G protocol, a transmission method of phase tracking reference signal is proposed, as shown in Fig. 1(a) and Fig. 1(b).

Figure 1(a) shows the downlink transmission, where the squares with different lines represent different ports, and each port of the phase tracking reference signal occupies one subcarrier and is continuously transmitted in one subframe. The base station notifies the user of the number of ports of the phase tracking reference signal used in transmission through dynamic signaling, and may use 2 ports for transmission, 1 port for transmission or no transmission. Figure 1(b) represents uplink transmission, p represents the port number, each port of the phase tracking reference signal occupies a subcarrier, and transmits at intervals in a subframe. The terminal notifies the base station of the number of ports of the phase noise compensation signal used in transmission through uplink dynamic signaling, and one port or two ports may be used. The PTRS is similar to a demodulation reference signal (De Modulation Reference Signal, DMRS), used when transmitting user data, and transmitted after being precoded. At the same time, in this system, each user data stream corresponds to a DMRS port, and is transmitted on a complete antenna array using the same precoding.

In the above solution, the phase tracking reference signal and the user data and the demodulation reference signal (Demodulation Reference Signal, DMRS) corresponding to the user data experience the same channel. The phase tracking reference signal is used to calculate the phase difference between the channel estimate on the symbol where it is located and the channel estimate on the symbol where the DMRS is located, so as to obtain the phase change caused by phase noise for channel estimation compensation and data demodulation.

In a multi-antenna transceiver system, the transmitting end is composed of multiple antenna units or antenna ports. If these antenna elements or antenna ports have the same phase noise (phase noise caused by the same phase noise source), the above solution can correctly estimate the phase noise and compensate for its influence. However, if the antenna units or antenna ports at the transmitting end have different phase noises, the channel experienced by the user data will have multiple phase changes at the same time. Using the above scheme, it is impossible to estimate the different phase changes caused by the phase noise of each part, and thus cannot Perform channel estimation compensation and data demodulation correctly.

To sum up, in the prior art, when there are multiple phase noises at the antenna port of the transmitting end, the multiple phase noises cannot be calculated, so the receiving end cannot accurately analyze the received data stream.

Contents of the invention

The invention provides a data transmission method, a sending device and a receiving device, which are used to calculate multiple phase noises at the sending end, so that the receiving end can correctly analyze the received data stream.

In the first aspect, an embodiment of the present invention provides a data transmission method with phase noise compensation capability, including:

The transmitting end transmits R data streams to the receiving end on M antenna groups, each data stream is transmitted from M antenna groups after precoding, the phase noise of the antenna ports in the same antenna group is the same, and M is a positive integer;

The transmitting end sends S phase tracking reference signals PTRS to the receiving end, and each PTRS is transmitted from K antenna groups in the M antenna groups after being precoded, and the K antenna groups have the same phase noise ;

The sending end sends M*R DMRSs to the receiving end, and each demodulation reference signal DMRS is precoded and transmitted from an antenna group;

Wherein, one PTRS corresponds to at least one DMRS, and the corresponding PTRS and DMRS use the same antenna group for transmission, and each data stream corresponds to M DMRS ports transmitted on M different antenna groups.

Optionally, the method also includes:

The sending end determines the mapping relationship between PTRS and DMRS, and sends the mapping relationship to the receiving end through high-level signaling or dynamic control signaling; or

The mapping relationship between PTRS and DMRS is pre-agreed by the sending end and the receiving end.

Optionally, the method also includes:

The sending end sends the mapping relationship between the data stream and the DMRS to the receiving end through high-level signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is pre-agreed between the sending end and the receiving end.

Optionally, the precoding used by the PTRS is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the partial weight is the The weight corresponding to the antenna group used by the PTRS.

Optionally, the precoding used by the DMRS is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is the antenna group used to transmit the DMRS the corresponding weight.

In a second aspect, an embodiment of the present invention provides a data transmission method with phase noise compensation capability, including:

The receiving end obtains the first channel estimation value corresponding to each DMRS according to the M*R DMRS sent by the transmitting end received by each antenna port, wherein the transmitting end includes M antenna groups, and the antennas in the same antenna group The phase noise of the port is the same, M is a positive integer, and R is the number of received data streams, and each DMRS is transmitted from one antenna group after precoding;

The receiving end obtains the second channel estimation value corresponding to each PTRS according to the S PTRS received by each antenna port and sent by the sending end, wherein each PTRS is precoded from the M antenna groups transmitting on K antenna groups, where the K antenna groups have the same phase noise;

According to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS, the receiving end determines that the antenna group of the transmitting end corresponding to each DMRS is located in the symbol where the PTRS is located. relative to the phase change on the symbol where the DMRS is located;

The receiving end, according to the phase change of each antenna group of the sending end and the mapping relationship between the data stream and the DMRS, determines the channel estimation value corresponding to each of the R data streams received on the symbol where the PTRS is located;

The receiving end parses each data stream according to the determined channel estimation value corresponding to each data stream.

Optionally, for each antenna port at the receiving end, according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and DMRS, determine the The phase change of the antenna group at the transmitting end corresponding to the DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located includes:

For each PTRS, the receiving end determines the DMRS corresponding to the PTRS according to the mapping relationship between the PTRS and the DMRS; determines the first channel estimate value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located; The DMRS corresponding to the PTRS compares the first channel estimation value of the subcarrier where the PTRS is located with the second channel estimation value corresponding to the PTRS, and obtains that the antenna group of the transmitting end corresponding to each DMRS is relatively The phase change on the symbol where the DMRS is located.

Optionally, the receiving end receives the mapping relationship between PTRS and DMRS sent by the sending end through high-level signaling or dynamic control signaling; or

The mapping relationship between PTRS and DMRS is pre-agreed by the sending end and the receiving end.

Optionally, the receiving end receives the mapping relationship between the data flow sent by the sending end and the DMRS through high-layer signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is pre-agreed between the sending end and the receiving end.

In a third aspect, an embodiment of the present invention provides a sending device, including:

The data stream sending unit is used to transmit R data streams to the receiving device on the M antenna groups, each data stream is transmitted from the M antenna groups after precoding, and the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer;

A PTRS sending unit, configured to send S PTRSs to the receiving device, each PTRS is precoded and transmitted from K antenna groups in the M antenna groups, and the K antenna groups have the same phase noise;

The DMRS sending unit is used to send M*R DMRS to the receiving device, and each DMRS is transmitted from one antenna group after being precoded, wherein, one PTRS corresponds to at least one DMRS, and the corresponding PTRS and DMRS use the same The antenna groups are used for transmission, and each data stream corresponds to M DMRS ports transmitted on M different antenna groups.

Optionally, the sending device further includes a mapping relationship sending unit, configured to determine a mapping relationship between PTRS and DMRS, and send the mapping relationship to the receiving device through high-level signaling or dynamic control signaling; or

The mapping relationship between PTRS and DMRS is pre-agreed by the sending device and the receiving device.

Optionally, the method further includes a mapping relationship sending unit, configured to send the mapping relationship between the data stream and the DMRS to the receiving device through high-layer signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is pre-agreed by the sending device and the receiving device.

Optionally, the precoding used by the PTRS is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the partial weight is the The weight corresponding to the antenna group used by the PTRS.

Optionally, the precoding used by the DMRS is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is the antenna group used to transmit the DMRS the corresponding weight.

In a fourth aspect, an embodiment of the present invention provides a receiving device, including:

The first channel estimation value determination unit is configured to obtain the first channel estimation value corresponding to each DMRS according to the M*R DMRS received by each antenna port and sent by the transmitting end, wherein the transmitting end includes M antennas group, the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer, and R is the number of received data streams, and each DMRS is transmitted from one antenna group after precoding;

The second channel estimation value determining unit is configured to obtain the second channel estimation value corresponding to each PTRS according to the S PTRS received by each antenna port and sent by the transmitting end, wherein each PTRS is precoded from transmitting on K antenna groups among the M antenna groups, where the K antenna groups have the same phase noise;

A phase change determining unit, configured to determine the antenna group at the transmitting end corresponding to each DMRS according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS. The phase change on the symbol where PTRS is located relative to the symbol where DMRS is located;

A channel estimation value determination unit, configured to determine the channel corresponding to each of the R data streams received on the symbol where the PTRS is located according to the phase change of each antenna group at the transmitting end and the mapping relationship between the data stream and the DMRS channel estimate;

The parsing unit is configured to parse each data stream according to the determined channel estimation value corresponding to each data stream.

Optionally, the phase change determining unit is specifically configured to:

For each PTRS, according to the mapping relationship between the PTRS and the DMRS, determine the DMRS corresponding to the PTRS; determine the first channel estimate of the DMRS corresponding to the PTRS in the subcarrier where the PTRS is located; set the DMRS corresponding to the PTRS The first channel estimation value of the subcarrier where the PTRS is located is compared with the second channel estimation value corresponding to the PTRS, and it is obtained that the antenna group of the sending device corresponding to each DMRS is relative to the DMRS on the symbol where the PTRS is located. Phase change across symbols.

Optionally, the receiving device further includes a mapping relationship receiving unit, configured to receive the mapping relationship between PTRS and DMRS sent by the sending device through high-level signaling or dynamic control signaling; or

The mapping relationship between PTRS and DMRS is pre-agreed by the sending device and the receiving device.

Optionally, the receiving device further includes a mapping relationship receiving unit, configured to receive the mapping relationship between the data stream and the DMRS sent by the sending device through high-level signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is pre-agreed by the sending device and the receiving device.

In the embodiment of the present invention, the transmitting end transmits R data streams to the receiving end on M antenna groups, and sends S PRTS to the receiving end, wherein each PTRS is precoded from K antenna groups with the same phase noise Transmission, and sending M*R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after precoding, wherein the phase noise of the antenna ports in the same group is the same, in the embodiment of the present invention, by combining each DMRS Transmit on different antenna groups, and at the same time transmit each PTRS on antenna groups with the same phase noise, where the antenna ports in the same group have the same phase noise, so that the receiving end can calculate based on the information sent by the sending end The phase noise of each antenna group at the transmitting end can be calculated, and then phase compensation can be performed according to the calculated phase noise to eliminate the influence of phase noise and ensure accurate data transmission.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1(a) is a schematic diagram of transmission of PTRS in the downlink direction provided by an embodiment of the present invention;

FIG. 1(b) is a schematic diagram of PTRS transmission in the uplink direction provided by an embodiment of the present invention;

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

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

FIG. 4 is a schematic diagram of a subframe configuration of a reference signal provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of a data and reference signal transmission method provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a sending device provided by an embodiment of the present invention;

Fig. 7 is a schematic diagram of a receiving device provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the embodiment of the present invention, the sending end is a terminal, and the receiving end is a base station; or the sending end is a base station, and the receiving end is a terminal. That is, the method provided by the embodiment of the present invention is applicable to both uplink transmission and downlink transmission.

In the embodiment of the present invention, the transmitting end has N antenna ports (in practical applications, one antenna port can be composed of one or more antenna elements), and N is an integer greater than 1. According to the difference in phase noise, the N antenna ports of the transmitting end The antenna ports are divided into M groups, where the antenna ports in the same group have the same phase noise, and the phase noise between the two groups may or may not be the same.

For example, assuming that the transmitter has 6 antenna ports (N=6), the phase noises are:

Antenna port 1: phase noise a;

Antenna port 2: phase noise b;

Antenna port 3: phase noise a;

Antenna port 4: phase noise a;

Antenna port 5: phase noise b;

Antenna port 6: phase noise a.

Then there are many ways to group the above 6 ports, for example, it can be:

Group 1: {antenna port 1, antenna port 3, antenna port 4, antenna port 6};

Group 2: {antenna port 2, antenna port 5}.

or can be:

Group 1: {antenna port 1, antenna port 3};

Group 2: {antenna port 4, antenna port 6};

Group 3: {antenna port 2, antenna port 5}.

or can be:

Group 1: {antenna port 1, antenna port 3};

Group 2: {Antenna Port 4};

Group 3: {antenna port 6};

Group 4: {antenna port 2, antenna port 5}.

Of course, other grouping methods are also possible, as long as the phase noises of the antenna ports in the same group are guaranteed to be the same, and the phase noises of the antenna ports between groups may be the same or different.

In the embodiment of the present invention, it is assumed that the sending end sends R data streams to the receiving end, and R is a positive integer.

As shown in Figure 2, it is a schematic diagram of the data transmission method provided by the embodiment of the present invention, the execution subject is the sending end, and the sending end is a terminal or a base station, including:

Step 201, the transmitting end transmits R data streams to the receiving end on M antenna groups, each data stream is transmitted from M antenna groups after precoding, the phase noise of the antenna ports in the same antenna group is the same, and M is positive integer.

Step 202, the transmitting end sends S PTRS to the receiving end, and each PTRS is precoded and transmitted from K antenna groups of M antenna groups, and the K antenna groups have the same phase noise.

Step 203, the sending end sends M*R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after being precoded, wherein, one PTRS corresponds to at least one DMRS, and the corresponding PTRS and DMRS use the same antenna group For transmission, each data stream corresponds to M DMRS ports transmitted on M different antenna groups.

In the above step 201, the transmitting end transmits R data streams to the receiving end through M antenna groups, wherein each data stream is precoded and sent to the receiving end through M antenna groups.

In the above step 202, the transmitting end sends S PTRS to the receiving end, wherein each PTRS is precoded and transmitted from K antenna groups, wherein, and the K antenna groups are antenna groups with the same noise, for example Say, taking the above example as an illustration, suppose the antenna at the sending end is divided into:

Group 1: {antenna port 1, antenna port 3};

Group 2: {antenna port 4, antenna port 6};

Group 3: {antenna port 2, antenna port 5}.

Wherein, the phase noises of the antenna ports in Group 1 and Group 2 are the same, and the phase noises of the antenna ports in Group 3 are different from those of the antenna ports in Group 1 and Group 2. For any one of the S PTRSs, it can be Send from group 1, or send from group 2, or send from group 1 and group 2, or send from group 3.

Optionally, the precoding used for the PTRS in this step is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the partial weight is The weight corresponding to the antenna group used to transmit the PTRS.

In the above step 203, the transmitting end sends M*R DMRSs to the receiving end, and each DMRS is transmitted from one antenna group after being precoded.

That is, each DMRS is sent to the receiving end from M ports, and, optionally, the precoding used by the DMRS is composed of the partial weights of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located , the partial weights are weights corresponding to the antenna groups used to transmit the DMRS.

And, the sending end sends the mapping relationship between the data flow and the DMRS to the receiving end through high-level signaling or dynamic control signaling; or the mapping relationship between the data flow and the DMRS is pre-agreed by the sending end and the receiving end; wherein, each data flow corresponds to M DMRS ports transmitted on M different antenna groups respectively.

And, the sending end determines the mapping relationship between PTRS and DMRS, and sends the mapping relationship to the receiving end through high-level signaling or dynamic control signaling; or the mapping relationship between PTRS and DMRS is determined by the sending end and the receiving end in advance It is stipulated that one PTRS corresponds to at least one DMRS, and the corresponding PTRS and DMRS are transmitted using the same antenna group, and each data stream corresponds to M DMRS ports transmitted on M different antenna groups.

In the embodiment of the present invention, the transmitting end transmits R data streams to the receiving end on M antenna groups, and sends S PRTS to the receiving end, wherein each PTRS is precoded from K antenna groups with the same phase noise Transmission, and sending M*R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after precoding, wherein the phase noise of the antenna ports in the same group is the same, in the embodiment of the present invention, by combining each DMRS Transmit on different antenna groups, and at the same time transmit each PTRS on antenna groups with the same phase noise, where the antenna ports in the same group have the same phase noise, so that the receiving end can calculate based on the information sent by the sending end The phase noise of each antenna group at the transmitting end can be calculated, and then phase compensation can be performed according to the calculated phase noise to eliminate the influence of phase noise and ensure accurate data transmission.

As shown in Figure 3, the data transmission method provided by the embodiment of the present invention, the execution subject is the receiving end, and the receiving end is a base station or terminal, including:

Step 301, the receiving end obtains the first channel estimation value corresponding to each DMRS according to the M*R DMRS received by each antenna port and sent by the sending end, wherein the sending end includes M antenna groups, and the same antenna group The phase noise of the antenna ports in is the same, M is a positive integer, and R is the number of received data streams, and each DMRS is transmitted from one antenna group after precoding.

Step 302, the receiving end obtains the second channel estimation value corresponding to each PTRS according to the S PTRS received by each antenna port and sent by the transmitting end, wherein each PTRS is precoded from M antenna groups The K antenna groups are transmitted on the K antenna groups, and the K antenna groups have the same phase noise.

Step 303: The receiving end determines that the antenna group of the transmitting end corresponding to each DMRS is located where the PTRS is based on the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS. The phase change on the symbol relative to the symbol where the DMRS is located.

Step 304, the receiving end determines the channel estimation value corresponding to each of the R data streams received on the symbol where the PTRS is located according to the phase change of each antenna group at the transmitting end and the mapping relationship between the data stream and the DMRS .

Step 305, the receiving end analyzes each data stream according to the determined channel estimation value corresponding to each data stream.

The data transmission method of the receiving end shown in FIG. 3 corresponds to the data transmission method of the sending end shown in FIG. Phase noise adjustment and analysis data.

In the above step 303, optionally, the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located is determined in the following manner:

For each PTRS, the receiver performs the following operations:

Step 1. Determine the DMRS corresponding to the PTRS according to the mapping relationship between the PTRS and the DMRS;

Step 2, determining the first channel estimate of the DMRS corresponding to the PTRS at the subcarrier where the PTRS is located;

Step 3, compare the first channel estimation value of the DMRS corresponding to the PTRS at the subcarrier where the PTRS is with the second channel estimation value corresponding to the PTRS, and obtain the relative relative The phase change on the symbol where the DMRS is located.

And, the receiving end also receives the mapping relationship between PTRS and DMRS sent by the transmitting end through high-level signaling or dynamic control signaling; or the mapping relationship between PTRS and DMRS is pre-agreed by the transmitting end and the receiving end.

And, the receiving end receives the mapping relationship between the data stream and the DMRS sent by the transmitting end through high-layer signaling or dynamic control signaling; or the mapping relationship between the data stream and the DMRS is pre-agreed by the transmitting end and the receiving end.

The data transmission method provided by the present invention will be explained and described in detail in combination with specific embodiments below.

Embodiment one

Assuming that the number of user data streams to be transmitted is R=2, the first N1 antenna ports in the antenna array at the transmitting end have the same phase noise and are divided into one group, and the last N-N1 antenna ports have the same phase noise and are divided into one group, namely M=2, and the phase noise is different between the two groups. The receiver uses two antenna ports with different phase noises. The transmitting end uses M*R=4 DMRS ports, and S=2 PTRS ports, where N is the total number of antenna ports at the transmitting end.

It is assumed that the subframe configuration of the reference signal is as shown in FIG. 4 . Among them, the DMRS is located in the third OFDM symbol, includes 4 ports, and is frequency division multiplexed within the symbol. Each PTRS reference signal occupies one subcarrier (PTRS port 1 is configured on the 8th subcarrier, and PTRS port 2 is configured on the 7th subcarrier), and is continuously transmitted on the 4th to 14th symbols. The 1-2 OFDM signals are control channels, and the rest are user data.

It should be noted that this is only used as an example for illustration, and how to configure the positions of the DMRS port and the PTRS port in actual applications can be determined according to actual needs.

Base station side (take the base station as the sending end as an example):

Taking the kth subcarrier as an example, the precoding matrix used for user data transmission is expressed as

in, Know is a column vector of N ₁ ×1, which respectively correspond to the weights used by the first N1 antenna ports in the precoding used by the first and second data streams. Know is a column vector of (NN ₁ )×1, which respectively correspond to the weights used by the last N-N1 antenna ports in the precoding used by the first and second data streams.

As shown in Figure 5, it is a schematic diagram of the data and reference signal transmission method provided by the embodiment of the present invention, wherein:

DMRS port 1 transmits on the first N1 antenna ports of the transmitting end, which are distributed on subcarriers d1=4, 8, and 12. For DMRS1 on subcarrier d1, it uses to pre-encode.

DMRS port 2 transmits on the last N-N1 antenna ports of the transmitting end, which are distributed on subcarriers d2=3, 7, and 11. For DMRS2 on subcarrier d2, it uses to pre-encode.

DMRS port 3 transmits on the first N1 antenna ports of the transmitting end, which are distributed on subcarriers d3=2, 6, and 10. For DMRS3 on subcarrier d3, it uses to pre-encode.

DMRS port 4 transmits on the last N-N1 antenna ports of the transmitting end, which are distributed on subcarriers d4=1, 5, and 9. For DMRS4 on subcarrier d4, it uses to pre-encode.

The 2 PTRS ports are used to estimate the phase noise of the antenna ports within the two groups. where PTRS port 1 uses For precoding, PTRS port 2 uses to pre-encode.

Figure 5 shows a schematic diagram of transmission, wherein the first data stream is transmitted at N1 antenna ports and N-N1 antenna ports respectively, and the second data stream is also transmitted at N1 antenna ports and N-N1 antenna ports; DMRS1 port, DMRS3 port, and PTRS1 port are transmitted on N1 antenna ports, and DMRS2 port, DMRS4 port, and PTRS2 port are transmitted on N-N1 antenna ports.

The base station notifies the terminal of the mapping of PTRS1 to DMRS1 and the mapping of PTRS2 to DMRS2 through high-level signaling or dynamic control signaling. At the same time, the base station notifies the terminal through high-layer signaling or dynamic control signaling that the first data flow is mapped to DMRS port 1 and DMRS port 2, and the second data flow is mapped to DMRS port 3 and DMRS port 4.

On the terminal side (take the terminal as the receiving end as an example):

The data received at the kth subcarrier of the lth OFDM symbol is expressed as:

Further expressed as:

Wherein, it is assumed that the channel H _{k, l} and the precoding W _{k, l} remain unchanged in a time unit (subframe). On the diagonal of the phase noise matrix at the transmitter, has N1 elements, has N-N1 elements.

The receiving end receives the DMRS reference signal in the third OFDM symbol. Taking the first receiving antenna port as an example, the composite channel is estimated by DMRS port 1 and the composite channel is estimated Estimated by DMRS port 2 Estimated by DMRS port 3 and estimated by DMRS port 4 On the symbol where the DMRS is located, channel interpolation can be used to estimate the channels of all subcarriers. According to the assumption in FIG. 4 , k=1, 2, . . . , 12 here.

The composite channel estimated above for each DMRS port is called a first channel estimation value.

The receiving end receives 2-port PTRS from the 4th OFDM symbol, and uses PTRS port 1 to estimate the composite channel Composite channel estimated using PTRS port 2

The composite channel of each PTRS port estimated above is called the second channel estimation value.

The receiving end receives the one-to-one mapping information between PTRS1 and PTRS2 and DMRS1 and DMRS2 notified by the sending end through signaling. According to this information, the channel estimation result of PTRS1 is divided by the channel estimation result of DMRS1, and the first group of antenna ports experienced by the lth symbol on the first receiving antenna port relative to the third symbol on the sending end phase change, expressed as

Similarly, according to this information, the channel estimation result of PTRS2 is divided by the channel estimation result of DMRS2, and the second group of antenna ports of the transmitting end of the lth symbol on the first receiving antenna port relative to the third symbol is obtained The phase change experienced, expressed as

The receiving end receives the information that the first data stream is mapped to DMRS ports 1 and 2 and the second data stream is mapped to DMRS ports 3 and 4 notified by the sending end through signaling. According to this information, the channel estimates of the channels experienced by the two data streams on the k-th subcarrier of the l-th symbol on the first receiving antenna or antenna port are obtained, respectively expressed as

Channel estimation experienced by the first data stream:

Channel estimation experienced by the second data stream:

Similarly, the channel estimation result of the channel experienced by the two data streams on the second receiving antenna port can be obtained. According to the above channel estimation results, demodulation of user data can be realized.

Other sub-carriers can be obtained in the same way, which will not be repeated here.

Embodiment two

Fig. 4 and Fig. 5 are also applicable to the second embodiment.

Base station side:

Taking the kth subcarrier as an example, the precoding matrix used for user data transmission is expressed as

in, Know is a column vector of N ₁ ×1, which respectively correspond to the weights used by the first N1 antenna ports in the precoding used by the first and second data streams. Know is a column vector of (NN ₁ )×1, which respectively correspond to the weights used by the last N-N1 antenna ports in the precoding used by the first and second data streams.

DMRS port 1 transmits on the first N1 antenna ports of the transmitting end, which are distributed on subcarriers d1=4, 8, and 12. For DMRS1 on subcarrier d1, it uses to pre-encode.

DMRS port 2 transmits on the last N-N1 antenna ports of the transmitting end, which are distributed on subcarriers d2=3, 7, and 11. For DMRS2 on subcarrier d2, it uses to pre-encode.

DMRS port 3 transmits on the first N1 antenna ports of the transmitting end, which are distributed on subcarriers d3=2, 6, and 10. For DMRS3 on subcarrier d3, it uses to pre-encode.

DMRS port 4 transmits on the last N-N1 antenna ports of the transmitting end, which are distributed on subcarriers d4=1, 5, and 9. For DMRS4 on subcarrier d4, it uses to pre-encode.

2 PTRS ports are used to estimate the phase noise of the two parts. Among them, PTRS port 1 is transmitted on the first N1 antenna ports of the transmitter, which uses For precoding, PTRS port 2 is transmitted on the last N-N1 antenna ports of the transmitter, which uses to pre-encode. Figure 5 gives a schematic diagram of the transfer.

The base station notifies the terminal of the information of mapping PTRS1 to DMRS1 and DMRS3 and the information of mapping PTRS2 to DMRS2 and DMRS4 to the terminal through high-level signaling or dynamic control signaling. At the same time, the base station notifies the terminal through high-level signaling or dynamic control signaling that the first data stream is mapped to DMRS 1 and DMRS2, and the second data stream is mapped to DMRS3 and DMRS4.

Terminal side:

The data received at the kth subcarrier of the lth symbol is expressed as:

Further expressed as:

Wherein, it is assumed that the channel H _{k, l} and the precoding W _{k, l} remain unchanged in a time unit (subframe). On the diagonal of the phase noise matrix at the transmitter, has N1 elements, has N-N1 elements.

The receiving end receives the DMRS reference signal in the third OFDM symbol. Taking the first receiving antenna port as an example, the composite channel is estimated by DMRS port 1 and the composite channel is estimated Estimated by DMRS port 2 Estimated by DMRS port 3 and estimated by DMRS port 4 On the symbol where the DMRS is located, channel interpolation can be used to estimate the channels of all subcarriers. According to the assumption in FIG. 4 , k=1, 2, . . . , 12 here.

The receiving end receives 2-port PTRS from the 4th OFDM symbol, and uses PTRS port 1 to estimate Estimated using PTRS port 2

The terminal side receives the information that PTRS1 is mapped to DMRS1 and DMRS3, and the information that PTRS2 is mapped to DMRS2 and DMRS4, notified by the base station through signaling, and uses the following calculation to obtain the first group of the sending end of the first symbol relative to the third symbol The phase change experienced by the antenna port, expressed as:

In the same way, it is obtained that the phase change experienced by the second group of antenna ports at the transmitting end of the first symbol relative to the third symbol is expressed as:

The information that the first data flow is mapped to DMRS ports 1 and 2 and the second data flow is mapped to DMRS ports 3 and 4 notified by the base station side through signaling is received. According to this information, the channel estimates of the channels experienced by the two data streams on the k-th subcarrier of the l-th symbol on the first receiving antenna or antenna port are obtained, respectively expressed as:

Channel estimation experienced by the first data stream:

Channel estimation experienced by the second data stream:

Similarly, the channel estimation result of the channel experienced by the two data streams on the second receiving antenna port can be obtained. According to the above channel estimation results, demodulation of user data can be realized.

Other sub-carriers can be obtained in the same way, which will not be repeated here.

Based on the same inventive concept, an embodiment of the present invention also provides a sending device. As shown in FIG. 6 , the sending device may be integrated inside the terminal or inside the base station to enable the terminal or the base station to have a sending function, including :

The data stream sending unit 601 is used to transmit R data streams to the receiving device on the M antenna groups, each data stream is transmitted from the M antenna groups after being precoded, and the phase noise of the antenna ports in the same antenna group is the same , M is a positive integer;

The PTRS sending unit 602 is configured to send S PTRSs to the receiving device, each PTRS is precoded and then transmitted from K antenna groups in the M antenna groups, and the K antenna groups have the same phase noise;

DMRS sending unit 603, configured to send M*R DMRSs to the receiving device, each DMRS is precoded and then transmitted from one antenna group, wherein one PTRS corresponds to at least one DMRS, and the corresponding PTRS and DMRS use The same antenna group performs transmission, and each data stream corresponds to M DMRS ports transmitted on M different antenna groups.

Optionally, the sending device further includes a mapping relationship sending unit 604, configured to determine a mapping relationship between PTRS and DMRS, and send the mapping relationship to the receiving device through high-level signaling or dynamic control signaling; or

The mapping relationship between PTRS and DMRS is pre-agreed by the sending device and the receiving device.

Optionally, the method further includes a mapping relationship sending unit 604, configured to send the mapping relationship between the data stream and the DMRS to the receiving device through high-level signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is pre-agreed by the sending device and the receiving device.

Optionally, the precoding used by the PTRS is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the partial weight is the The weight corresponding to the antenna group used by the PTRS.

Optionally, the precoding used by the DMRS is composed of a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is the antenna group used to transmit the DMRS the corresponding weight.

Based on the same inventive concept, an embodiment of the present invention provides a receiving device, as shown in FIG. 7 , including:

The first channel estimation value determining unit 701 is configured to obtain the first channel estimation value corresponding to each DMRS according to the M*R DMRS received by each antenna port and sent by the transmitting end, wherein the transmitting end includes M An antenna group, the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer, and R is the number of received data streams, and each DMRS is transmitted from one antenna group after precoding;

The second channel estimation value determining unit 702 is configured to obtain the second channel estimation value corresponding to each PTRS according to the S PTRS received by each antenna port and sent by the transmitting end, wherein each PTRS is precoded transmitting from K antenna groups among the M antenna groups, the K antenna groups having the same phase noise;

The phase change determination unit 703 is configured to determine the antenna group of the transmitting end corresponding to each DMRS according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS The phase change on the symbol where the PTRS is located relative to the symbol where the DMRS is located;

The channel estimation value determination unit 704 is configured to determine the corresponding channel of each of the R data streams received on the symbol where the PTRS is located according to the phase change of each antenna group at the transmitting end and the mapping relationship between the data stream and the DMRS. channel estimate;

The parsing unit 705 is configured to parse each data stream according to the determined channel estimation value corresponding to each data stream.

Optionally, the phase change determining unit 703 is specifically configured to:

For each PTRS, according to the mapping relationship between the PTRS and the DMRS, determine the DMRS corresponding to the PTRS; determine the first channel estimate of the DMRS corresponding to the PTRS in the subcarrier where the PTRS is located; set the DMRS corresponding to the PTRS The first channel estimation value of the subcarrier where the PTRS is located is compared with the second channel estimation value corresponding to the PTRS, and it is obtained that the antenna group of the sending device corresponding to each DMRS is relative to the DMRS on the symbol where the PTRS is located. Phase change across symbols.

Optionally, the receiving device further includes a mapping relationship receiving unit 706, configured to receive the mapping relationship between PTRS and DMRS sent by the sending device through high-layer signaling or dynamic control signaling; or

The mapping relationship between PTRS and DMRS is pre-agreed by the sending device and the receiving device.

Optionally, the receiving device further includes a mapping relationship receiving unit 706, configured to receive the mapping relationship between the data stream and the DMRS sent by the sending device through high-level signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is pre-agreed by the sending device and the receiving device.

In the embodiment of the present invention, the transmitting end transmits R data streams to the receiving end on M antenna groups, and sends S PRTS to the receiving end, wherein each PTRS is precoded from K antenna groups with the same phase noise Transmission, and sending M*R DMRS to the receiving end, and each DMRS is transmitted from one antenna group after precoding, wherein the phase noise of the antenna ports in the same group is the same, in the embodiment of the present invention, by combining each DMRS Transmit on different antenna groups, and at the same time transmit each PTRS on antenna groups with the same phase noise, where the antenna ports in the same group have the same phase noise, so that the receiving end can calculate based on the information sent by the sending end The phase noise of each antenna group at the transmitting end can be calculated, and then phase compensation can be performed according to the calculated phase noise to eliminate the influence of phase noise and ensure accurate data transmission.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (18)

1. A method of data transmission, comprising:

the method comprises the steps that a sending end transmits R data streams to a receiving end on M antenna groups, each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;

the sending end sends S phase tracking reference signals PTRS to the receiving end, each PTRS is transmitted from K antenna groups in M antenna groups after being precoded, and the K antenna groups have the same phase noise;

the transmitting end transmits M × R DMRSs to the receiving end, and each demodulation reference signal DMRS is transmitted from one antenna group after being precoded;

the PTRS and the DMRS with the corresponding relation are transmitted by using the same antenna group, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.

2. The data transmission method of claim 1, further comprising:

the sending end determines a mapping relation between the PTRS and the DMRS and sends the mapping relation to the receiving end through a high-level signaling or a dynamic control signaling; or

And the mapping relation between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.

3. The data transmission method of claim 1, further comprising:

the sending end sends the mapping relation between the data stream and the DMRS to the receiving end through a high-level signaling or a dynamic control signaling; or

And the mapping relation between the data stream and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.

4. The data transmission method according to claim 1, wherein the precoding used by the PTRS is composed of a part of weights in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the part of weights are weights corresponding to the antenna group used for transmitting the PTRS.

5. The data transmission method according to claim 1, wherein the precoding used by the DMRS is formed by a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is a weight corresponding to the antenna group used for transmitting the DMRS.

6. A method of data transmission, comprising:

the receiving end obtains a first channel estimation value corresponding to each DMRS according to M × R DMRSs received by each antenna port and sent by the sending end, wherein the sending end comprises M antenna groups, the phase noise of the antenna ports in the same antenna group is the same, M is a positive integer, R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;

the receiving end obtains a second channel estimation value corresponding to each PTRS according to S PTRSs received by each antenna port and sent by the sending end, wherein each PTRS is transmitted from K antenna groups in the M antenna groups after being precoded, and the K antenna groups have the same phase noise;

the receiving end determines phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS and the mapping relation between the PTRS and the DMRS;

the receiving end determines a channel estimation value corresponding to each data stream in R data streams received on a symbol where the PTRS is located according to the phase change of each antenna group of the transmitting end and the mapping relation between the data streams and the DMRS;

and the receiving end analyzes each data stream according to the determined channel estimation value corresponding to each data stream.

7. The data transmission method according to claim 6, wherein the determining, by the receiving end, the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol on which the PTRS is located relative to the symbol on which the DMRS is located according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and the mapping relationship between the PTRS and the DMRS, comprises:

aiming at each PTRS, the receiving end determines a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting end corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.

8. The data transmission method according to claim 6, wherein the receiving end receives the mapping relationship between the PTRS and the DMRS transmitted by the transmitting end through a higher layer signaling or a dynamic control signaling; or

And the mapping relation between the PTRS and the DMRS is agreed by the transmitting terminal and the receiving terminal in advance.

9. The data transmission method according to claim 6, wherein the receiving end receives the mapping relationship between the data stream and the DMRS sent by the sending end through a higher layer signaling or a dynamic control signaling; or

And the mapping relation between the data stream and the DMRS is agreed by the transmitting end and the receiving end in advance.

10. A transmitting apparatus, comprising:

a data stream sending unit, configured to transmit R data streams to a receiving device on M antenna groups, where each data stream is transmitted from the M antenna groups after being precoded, phase noises of antenna ports in the same antenna group are the same, and M is a positive integer;

the PTRS transmitting unit is used for transmitting S PTRSs to the receiving device, each PTRS is transmitted from K antenna groups in the M antenna groups after being precoded, and the K antenna groups have the same phase noise;

and the DMRS transmitting unit is used for transmitting M × R DMRSs to the receiving device, each DMRS is transmitted from one antenna group after being precoded, one PTRS at least corresponds to one DMRS, the PTRS and the DMRS with the corresponding relation use the same antenna group for transmission, and each data stream corresponds to M DMRS ports which are respectively transmitted on M different antenna groups.

11. The transmission apparatus according to claim 10, wherein the transmission apparatus further comprises a mapping relation transmission unit configured to determine a mapping relation between the PTRS and the DMRS, and transmit the mapping relation to the reception apparatus through higher layer signaling or dynamic control signaling; or

The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.

12. The transmitting apparatus according to claim 10, wherein the method further comprises a mapping relation transmitting unit configured to transmit a mapping relation between the data streams and the DMRS to the receiving apparatus through higher layer signaling or dynamic control signaling; or

The mapping relationship between the data streams and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.

13. The transmitter according to claim 10, wherein the precoding used by the PTRS is composed of a part of weights in the precoding used by the data stream corresponding to the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located, and the part of weights are weights corresponding to the antenna group used for transmitting the PTRS.

14. The transmitter according to claim 10, wherein the precoding used by the DMRS is formed by a partial weight of the precoding used by the data stream corresponding to the DMRS on the subcarrier where the DMRS is located, and the partial weight is a weight corresponding to an antenna group used for transmitting the DMRS.

15. A receiving apparatus, comprising:

the first channel estimation value determining unit is used for obtaining a first channel estimation value corresponding to each DMRS according to M × R DMRSs received by each antenna port and sent by a sending end, wherein the sending end comprises M antenna groups, phase noises of the antenna ports in the same antenna group are the same, M is a positive integer, R is the number of received data streams, and each DMRS is transmitted from one antenna group after being precoded;

a second channel estimation value determining unit, configured to obtain a second channel estimation value corresponding to each PTRS according to S PTRS received by each antenna port and sent by the sending end, where each PTRS is transmitted from K antenna groups of the M antenna groups after being precoded, and the K antenna groups have the same phase noise;

a phase change determining unit, configured to determine, according to the first channel estimation value corresponding to the DMRS, the second channel estimation value corresponding to the PTRS, and a mapping relationship between the PTRS and the DMRS, a phase change of the antenna group of the transmitting end corresponding to each DMRS on a symbol where the PTRS is located relative to a symbol where the DMRS is located;

a channel estimation value determining unit, configured to determine, according to the phase change of each antenna group at the sending end and the mapping relationship between the data streams and the DMRS, a channel estimation value corresponding to each data stream in R data streams received on a symbol where the PTRS is located;

and the analysis unit is used for analyzing each data stream according to the determined channel estimation value corresponding to each data stream.

16. The receiving apparatus according to claim 15, wherein the phase change determining unit is specifically configured to:

aiming at each PTRS, determining a DMRS corresponding to the PTRS according to the mapping relation between the PTRS and the DMRS; determining a first channel estimation value of the DMRS corresponding to the PTRS on a subcarrier where the PTRS is located; and comparing a first channel estimation value of the DMRS corresponding to the PTRS on the subcarrier where the PTRS is located with a second channel estimation value corresponding to the PTRS to obtain the phase change of the antenna group of the transmitting device corresponding to each DMRS on the symbol where the PTRS is located relative to the symbol where the DMRS is located.

17. The apparatus according to claim 15, wherein the apparatus further comprises a mapping relation receiving unit configured to receive a mapping relation between the PTRS and the DMRS, which is transmitted by the transmitting apparatus, through higher layer signaling or dynamic control signaling; or

The mapping relationship between the PTRS and the DMRS is agreed in advance by the transmitting apparatus and the receiving apparatus.

18. The apparatus according to claim 15, wherein the apparatus further comprises a mapping relation receiving unit configured to receive a mapping relation between the DMRS and the data stream transmitted by the transmitting apparatus through higher layer signaling or dynamic control signaling; or

The mapping relationship between the data stream and the DMRS is agreed in advance by the transmitting device and the receiving device.