CN105517663B - A method, device and system for signal transmission and reception - Google Patents

Abstract

The invention discloses the devices that a kind of signal is sent, comprising: selecting unit selects the m subcarrier for carrying data to be transmitted from n subcarrier on transmission channel, and the m is greater than or equal to 1, and the n is greater than the m；The data to be transmitted is modulated into modulated signal by modulation unit, and the modulated signal is mapped on the m subcarrier of the selecting unit selection；Transmission unit sends the modulated signal of the modulation unit modulation by the m subcarrier.The device that signal provided in an embodiment of the present invention is sent, can only take up portion subcarriers transmission data so that the degree of rarefication between making subcarrier increases reduces the interference between subcarrier.

Description

A method, device and system for signal transmission and reception

technical field

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

Background technique

Orthogonal Frequency Division Multiplexing (OFDM) is actually a type of Multi-Carrier Modulation (MCM). The main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data, and modulate each sub-channel for transmission. The quadrature signals can be separated by using the relevant technology at the receiving end.

The orthogonal frequency division multiplexing signal modulation method in the prior art divides the signal into N sub-signals, and then modulates the N sub-signals on N mutually orthogonal sub-carriers for transmission, and each sub-carrier is occupied, When there is frequency offset or Doppler spread, the interference between subcarriers is severe.

SUMMARY OF THE INVENTION

An embodiment of the present invention provides an apparatus for signal transmission, which does not need to occupy all subcarriers for signal transmission, thereby reducing interference between subcarriers. Embodiments of the present invention also provide a corresponding signal receiving apparatus, method, and system.

A first aspect of the present invention provides a signal transmission device, comprising:

a selection unit, configured to select m subcarriers for carrying data to be transmitted from the n subcarriers on the transmission channel, where m is greater than or equal to 1, and n is greater than m;

a modulation unit, configured to modulate the data to be transmitted into a modulation signal, and map the modulation signal to the m subcarriers selected by the selection unit;

A sending unit, configured to send the modulated signal modulated by the modulating unit through the m subcarriers.

With reference to the first aspect, in a first possible implementation manner, the apparatus further includes:

a first determination unit, configured to determine the subcarrier sparsity coefficient according to the determination information of the subcarrier sparsity coefficient before the selection unit selects m subcarriers for carrying data to be transmitted, the subcarrier sparsity coefficient The coefficient is the ratio of m to n;

A second determining unit, configured to determine the m according to the subcarrier sparsity coefficient and the n determined by the first determining unit.

Combined with the first possible implementation manner of the first aspect, in the second possible implementation manner,

The first determining unit is configured to determine the subcarrier sparsity coefficient according to the association relationship between preset communication scene information and the subcarrier sparsity coefficient, where the communication scene information includes the distance between the transmitting end and the receiving end, The moving speed of the receiving end relative to the transmitting end and the load information of the serving cell serving the transmitting end or the receiving end.

Combined with the first possible implementation of the first aspect, in the third possible implementation,

The first determining unit is configured to determine a trade-off balance weight coefficient according to the device type of the transmitting end, where the trade-off balance weight coefficient is used to reflect the importance of the energy efficiency ratio; the sub-carrier sparsity coefficient is determined according to the energy efficiency function, The energy efficiency function is a compromise optimization objective function between spectral efficiency and energy efficiency ratio, and when the energy efficiency function reaches a maximum value, the sparsity coefficient of the corresponding subcarrier is the subcarrier sparsity coefficient.

With reference to any one of the first to third possible implementations of the first aspect, in a fourth possible implementation, the apparatus further includes:

a third determining unit, configured to determine, according to the sub-carrier sparsity coefficient and the n determined by the first determining unit, the number of bits k ₁ of sub-carrier position information and the number of bits of modulation information of the m sub-carriers k ₂ ;

The obtaining unit is configured to perform bit mapping according to the preset mapping mode according to the k ₁ and k ₂ determined by the third determining unit, so as to obtain the mapping bit set of the subcarrier position information and the mapping bit set of the modulation information.

In combination with the fourth possible implementation manner of the first aspect, in the fifth possible implementation manner,

The modulation unit is configured to modulate the mapping bit set of the modulation information obtained by the obtaining unit onto m modulation symbols, and determine the mapping bit set of the subcarrier position information obtained by the obtaining unit according to the mapping bit set of the subcarrier position information obtained by the obtaining unit. The number of the m subcarriers, the m modulation symbols are mapped to the m subcarriers corresponding to the number, and one of the m modulation symbols is mapped on each of the m subcarriers.

In combination with the fifth possible implementation manner of the first aspect, in the sixth possible implementation manner,

The modulation unit is configured to determine the number of the m subcarriers from a preset subcarrier mapping table according to the mapping bit set of the subcarrier position information, and the subcarrier mapping table is used to reflect the subcarriers The mapping bit set of the location information is associated with the number of subcarriers.

A second aspect of the present invention provides a signal receiving device, comprising:

a receiving unit, configured to receive the modulated signal carried on the subcarrier;

a determining unit, configured to determine, from the n subcarriers on the transmission channel, m subcarriers carrying the modulated signal received by the receiving unit, where m is greater than or equal to 1, and n is greater than m;

and a demodulation unit, configured to demodulate the modulated signal from the m sub-carriers determined by the determination unit to obtain the data sent by the transmitting end.

With reference to the second aspect, in a first possible implementation manner, the apparatus further includes: an acquiring unit,

the obtaining unit, configured to obtain the subcarrier sparsity coefficient;

The determining unit is configured to, according to the sub-carrier sparsity coefficient acquired by the acquiring unit, determine m sub-carriers carrying modulated signals from the n sub-carriers on the transmission channel.

In combination with the first possible implementation manner of the second aspect, in the second possible implementation manner,

The obtaining unit is configured to blindly detect the m through the sub-carrier power, and determine the sub-carrier sparsity coefficient according to the m and n.

Combined with the first possible implementation manner of the second aspect, in the third possible implementation manner,

The obtaining unit is configured to receive the subcarrier sparsity coefficient sent by the sending end through a dedicated control channel or a high-level message.

With reference to the second aspect and any one of the first to third possible implementation manners of the second aspect, in a fourth possible implementation manner,

The determining unit is further configured to determine the number of the m sub-carriers through a signal detection algorithm;

The demodulating unit is configured to demodulate the modulated signal from the m sub-carriers corresponding to the numbers according to the numbers of the m sub-carriers determined by the determining unit, to obtain the data sent by the transmitting end.

In combination with the fourth possible implementation manner of the second aspect, in the fifth possible implementation manner,

The determining unit is configured to determine, according to the numbers of the m subcarriers, a mapping bit set of subcarrier position information from a preset subcarrier mapping table, where the subcarrier mapping table is used to reflect the subcarrier position information The mapping bit set is associated with the number of subcarriers.

In combination with the fifth possible implementation manner of the second aspect, in the sixth possible implementation manner,

The demodulation unit is configured to perform frequency domain equalization on the m sub-carriers, obtain m frequency-domain equalized modulation symbols, and demodulate the m frequency-domain equalized modulation symbols to obtain a modulation symbol of the modulation information. The mapping bit set is to aggregate the mapping bit set of the subcarrier position information and the mapping bit set of the modulation information into data sent by the transmitting end.

A third aspect of the present invention provides a method for signal transmission, comprising:

From the n subcarriers on the transmission channel, select m subcarriers for carrying data to be transmitted, where m is greater than or equal to 1, and n is greater than m;

modulating the data to be transmitted into a modulated signal, and mapping the modulated signal onto the m subcarriers;

The modulated signal is transmitted through the m subcarriers.

With reference to the third aspect, in a first possible implementation manner, before selecting m subcarriers for carrying data to be transmitted from the n subcarriers on the transmission channel, the method further includes:

determining the subcarrier sparsity coefficient according to the determination information of the subcarrier sparsity coefficient, where the subcarrier sparsity coefficient is a ratio of m to n;

The m is determined according to the subcarrier sparsity coefficient and the n.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, the determining the subcarrier sparsity coefficient according to the determination information of the subcarrier sparsity coefficient includes:

The subcarrier sparsity coefficient is determined according to the association relationship between preset communication scene information and the subcarrier sparsity coefficient, where the communication scene information includes the distance between the sender and the receiver, the speed at which the receiver moves relative to the sender, and Load information of the serving cell serving the sender or the receiver.

With reference to the first possible implementation manner of the third aspect, in a third possible implementation manner, the determining the subcarrier sparsity coefficient according to the determination information of the subcarrier sparsity coefficient includes:

Determine a trade-off balance weight coefficient according to the device type of the sender, where the trade-off balance weight coefficient is used to reflect the importance of the energy efficiency ratio;

The subcarrier sparsity coefficient is determined according to an energy efficiency function, which is a compromise optimization objective function between spectral efficiency and energy efficiency ratio, and when the energy efficiency function reaches a maximum value, the sparsity coefficient of the corresponding subcarrier is the Subcarrier sparsity coefficient.

With reference to any one of the first to third possible implementation manners of the third aspect, in a fourth possible implementation manner, before modulating the to-be-transmitted data on the m subcarriers, the The method also includes:

According to the sub-carrier sparsity coefficient and the n, determine the number of bits k ₁ of sub-carrier position information and the number of bits of modulation information k ₂ of the m sub-carriers;

According to the k ₁ and k ₂ , bit mapping is performed according to a preset mapping mode to obtain a mapped bit set of subcarrier position information and a mapped bit set of modulation information.

With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner, the modulating the to-be-transmitted data onto the m subcarriers includes:

modulating the mapping bit set of the modulation information onto m modulation symbols;

determining the number of the m subcarriers according to the mapping bit set of the subcarrier position information;

The m modulation symbols are mapped to the m subcarriers corresponding to the numbers, and one of the m modulation symbols is mapped to each of the m subcarriers.

With reference to the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner, the determining of the numbers of the m subcarriers according to the mapping bit set of the subcarrier position information includes:

According to the mapping bit set of the sub-carrier position information, the number of the m sub-carriers is determined from a preset sub-carrier mapping table, and the sub-carrier mapping table is used to reflect the mapping bit set of the sub-carrier position information and Corresponding association of subcarrier numbers.

A fourth aspect of the present invention provides a method for signal reception, comprising:

receiving a modulated signal carried on a subcarrier;

From the n subcarriers on the transmission channel, determine m subcarriers carrying modulated signals, where m is greater than or equal to 1, and n is greater than m;

The modulated signal is demodulated from the m subcarriers to obtain the data sent by the sender.

With reference to the fourth aspect, in a first possible implementation manner, before the m subcarriers carrying the modulated signal are determined from the n subcarriers on the transmission channel, the method further includes:

Get the subcarrier sparsity coefficient;

Determining m sub-carriers carrying modulated signals from the n sub-carriers on the transmission channel, including:

According to the subcarrier sparsity coefficient, m subcarriers carrying modulated signals are determined from the n subcarriers on the transmission channel.

With reference to the first possible implementation manner of the fourth aspect, in the second possible implementation manner, the obtaining of the subcarrier sparsity coefficient includes:

The m is blindly detected by sub-carrier power, and the sub-carrier sparsity coefficient is determined according to the m and n.

With reference to the first possible implementation manner of the fourth aspect, in a third possible implementation manner, the obtaining of the subcarrier sparsity coefficient includes:

The subcarrier sparsity coefficient sent by the sending end is received through a dedicated control channel or a higher layer message.

With reference to the fourth aspect and any one of the first to third possible implementation manners of the fourth aspect, in a fourth possible implementation manner, before demodulating the data from the m subcarriers , the method also includes:

Determine the number of the m subcarriers by a signal detection algorithm;

The demodulation of the modulated signal from the m sub-carriers to obtain the data sent by the sender includes:

According to the numbers of the m subcarriers, the modulated signal is demodulated from the m subcarriers corresponding to the numbers to obtain the data sent by the transmitting end.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner, after the number of the m subcarriers is determined through a signal detection algorithm, the method further includes:

According to the number of the m sub-carriers, the mapping bit set of the sub-carrier position information is determined from the preset sub-carrier mapping table, and the sub-carrier mapping table is used to reflect the mapping bit set of the sub-carrier position information and the sub-carriers The corresponding association of the number.

With reference to the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner, the modulated signal is demodulated from the m sub-carriers corresponding to the numbers according to the numbers of the m sub-carriers, Get the data sent by the sender, including:

Perform frequency domain equalization on the m subcarriers to obtain m frequency-domain equalized modulation symbols;

demodulating the m frequency-domain equalized modulation symbols to obtain a mapping bit set of modulation information;

The mapping bit set of the subcarrier position information and the mapping bit set of the modulation information are aggregated into data sent by the sending end.

A fifth aspect of the present invention provides a signal transmission system, comprising: a signal sending device and a signal receiving device,

The signal sending device is configured to select m sub-carriers for carrying data to be transmitted from n sub-carriers on the transmission channel, where m is greater than or equal to 1, and n is greater than the m, and the The data to be transmitted is modulated into a modulated signal, and the modulated signal is mapped onto the m subcarriers. sending the modulated signal through the m subcarriers;

The signal receiving device is configured to receive the modulated signal carried on the sub-carrier, and determine m sub-carriers carrying the modulated signal from the n sub-carriers on the transmission channel, the m is greater than or equal to 1, the n If the value is greater than the m, the modulated signal is demodulated from the m sub-carriers to obtain the data sent by the transmitter.

In this embodiment of the present invention, a selection unit is used to select m subcarriers for carrying data to be transmitted from n subcarriers on a transmission channel, where m is greater than or equal to 1, and n is greater than m; The data to be transmitted is modulated into a modulated signal, and the modulated signal is mapped onto the m subcarriers selected by the selection unit; the sending unit sends the modulated signal modulated by the modulation unit through the m subcarriers. Compared with the prior art that occupies all sub-carriers in the channel to send data, the device for signal transmission provided by the embodiment of the present invention can only occupy part of the sub-carriers to send data, thereby increasing the sparsity between sub-carriers and reducing the number of sub-carriers. Inter-carrier interference.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic diagram of an embodiment of a method for signal transmission in an embodiment of the present invention;

FIG. 2 is a schematic diagram of an embodiment of a method for signal reception in an embodiment of the present invention;

3 is a schematic diagram of an embodiment of an apparatus for signal transmission in an embodiment of the present invention;

4 is a schematic diagram of another embodiment of an apparatus for signal transmission in an embodiment of the present invention;

FIG. 5 is a schematic diagram of another embodiment of an apparatus for signal transmission in an embodiment of the present invention;

6 is a schematic diagram of an embodiment of a signal receiving apparatus in an embodiment of the present invention;

FIG. 7 is a schematic diagram of another embodiment of an apparatus for signal receiving in an embodiment of the present invention;

FIG. 8 is a schematic diagram of another embodiment of a signal sending method in an embodiment of the present invention;

FIG. 9 is a schematic diagram of another embodiment of a method for signal receiving in an embodiment of the present invention;

FIG. 10 is a schematic diagram of another embodiment of an apparatus for signal transmission in an embodiment of the present invention;

11 is a schematic diagram of another embodiment of an apparatus for signal receiving in an embodiment of the present invention;

FIG. 12 is a schematic diagram of an embodiment of a system for signal transmission in an embodiment of the present invention.

Detailed ways

The embodiment of the present invention provides a method for signal transmission, which does not need to occupy all subcarriers for signal transmission, thereby reducing interference between subcarriers. Embodiments of the present invention also provide a corresponding demodulation method, device, and system. Each of them will be described in detail below.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

The transmitting end in the embodiment of the present invention may be a terminal or a base station, and the receiving end in the embodiment of the present invention may be a base station or a terminal.

Referring to FIG. 1 , an embodiment of a signal transmission method provided by an embodiment of the present invention includes:

At the transmitter, when there is data to be sent, in order to reduce the interference between subcarriers, the transmitter only selects some subcarriers to carry data. The selection process for some subcarriers is as follows:

Determine the sparsity coefficient δ of the subcarrier, and the definition of the subcarrier sparsity coefficient δ is:

Wherein, n is the total number of sub-carriers on the transmission channel; m is the number of sub-carriers carrying modulated signals. In the embodiment of the present invention, M-Quadrature Amplitude Modulation (M-QAM) modulation is used as an example to perform In fact, it can also be other modulation methods.

There are two methods for determining the sparsity coefficient of the subcarrier provided by the embodiment of the present invention:

The first method is: according to the communication scene information, from the preset association relationship between the communication scene information and the subcarrier sparsity coefficient, determine the subcarrier sparsity coefficient, and the communication scene information includes the transmission end and the subcarrier sparsity coefficient. The distance of the receiving end, the moving speed of the receiving end relative to the transmitting end, and the load information of the serving cell serving the transmitting end or the receiving end.

The distance between the sending end and the receiving end can be obtained through the path loss measurement, the speed of the moving end of the receiving end relative to the sending end can be obtained through the Doppler spread measurement, and the load information of the serving cell serving the sending end or the receiving end is the service The ratio of the actual throughput of the cell to the maximum throughput of the serving cell.

Regarding the process of determining the subcarrier sparsity coefficient according to the communication scenario information, you can refer to the following example for understanding:

As shown in Table 1 and Table 2, Table 1 is the lookup table of the subcarrier sparsity coefficient δ when the load of the serving cell is less than 50%, and Table 2 is the subcarrier sparsity coefficient δ when the load of the serving cell is greater than 50%. lookup table.

Table 1 Subcarrier sparsity coefficient δ when serving cell load is less than 50%

Table 2 Subcarrier sparsity coefficient δ when serving cell load is greater than 50%

As shown in Table 1 and Table 2, according to the three dimensions of the distance between the sender and the receiver, the speed at which the receiver moves relative to the sender, and the load information of the serving cell serving the sender or the receiver, we can The corresponding subcarrier sparsity coefficient δ is found from Table 1.

Of course, Table 1 and Table 2 are just examples. In fact, Table 1 and Table 2 can also be made more fine-grained. The load can be divided into 20% and 10%. Of course, the range of classification can also be smaller, or is other values, the speed range can also be smaller, and the distance range can also be smaller, so that the obtained subcarrier sparsity coefficient δ will be more accurate.

The second method for determining the subcarrier sparsity coefficient δ may be:

The subcarrier sparsity coefficient is determined according to the compromise between spectral efficiency and energy efficiency ratio. The specific process can be as follows:

Determine a trade-off balance weight coefficient according to the device type of the sender, where the trade-off balance weight coefficient is used to reflect the importance of the energy efficiency ratio;

The sub-carrier sparsity coefficient is determined according to an energy efficiency function, which is a compromise optimization objective function of spectral efficiency and energy efficiency ratio. When the energy efficiency function reaches a maximum value, the corresponding sub-carrier sparsity coefficient is the determined value. the subcarrier sparsity coefficient.

Define a compromise optimization objective function between spectral efficiency and energy efficiency ratio, that is, the "energy efficiency function":

R(λ,SE,η)=(1-λ)·SE+λ·η

Among them, SE is the spectral efficiency, η is the energy efficiency ratio, and λ is the compromise balance weight coefficient, reflecting the importance of the energy efficiency ratio, 0≤λ≤1.

The calculation methods of spectral efficiency and energy efficiency ratio are:

(bit/s/Hz)——spectral efficiency;

(bit/s/w)——energy efficiency ratio;

P _SC - the power of a single subcarrier.

where n is known and m=nδ.

First, select the appropriate λ according to the device type of the sender. Different types of devices have different requirements on the energy efficiency ratio. The following table is an example:

Table 3 The relationship between equipment type and trade-off balance weight coefficient λ

Then, by selecting the optimal subcarrier sparsity coefficient δ, the compromise optimization objective function can be maximized:

When the compromise optimization objective function reaches the maximum, that is, when the energy efficiency function reaches the maximum, the sparsity coefficient of the corresponding subcarrier is the subcarrier sparsity coefficient δ.

After the subcarrier sparsity coefficient δ is determined, the number m of subcarriers carrying data is determined according to the subcarrier sparsity coefficient δ, m=n·δ, since n is known and δ has been determined, so, m can be directly obtained . Then, the total number of transmitted bits K also needs to be determined, and the total number of transmitted bits K includes the number of bits k ₁ of the subcarrier position information and the number of bits k ₂ of the M-QAM modulation information.

K=k ₁ +k ₂

in, - the number of subcarrier position information bits;

m sub-carriers are selected from n sub-carriers and coexist combination Therefore, the number of information bits carried by the subcarrier position is Indicates rounded down.

k ₂ =m·log ₂ (M)—the number of bits of M-QAM modulation information. In the embodiment of the present invention, M-QAM modulation is used as an example for description, but in fact, it is not limited to M-QAM modulation.

Since the number of information bits carried by a single M-QAM modulated sub-carrier is log ₂ (M), the number of information bits carried by m M-QAM modulated sub-carriers is k ₂ =m·log ₂ (M).

After determining k ₁ and k ₂ , the data transmission bit stream (b ₁ ,...,b _K ) is decomposed into two parts by bit mapping: the mapping bit set of subcarrier position information and the mapping bit set of M-QAM modulation information

Bit mapping methods may include: centralized bit mapping and distributed bit mapping.

Method 1: Centralized bitmap.

The first k ₁ bits of the transmission bit stream (b ₁ ,...,b _K ) are used as the mapping bit set of the subcarrier position information The following k ₂ bits are used as the mapping bit set of M-QAM modulation information

Assuming k ₁ =3, k ₂ =6, the mapped result obtained by the centralized bit mapping can be understood by referring to Table 4:

Table 4 Centralized bitmap

Before mapping b₁ b₂ b₃ b₄ b₅ b₆ b₇ b₈ b₉ After mapping p₁ p₂ p₃ q₁ q₂ q₃ q₄ q₅ q₆

It can be read from Table 4 that when k ₁ =3, k ₂ =6, the first three bits are p ₁ , p ₂ and p ₃ , and the last six bits are q ₁ , q ₂ , q ₃ , q ₄ , q ₅ , q ₆ .

Method 2: Distributed Bitmap:

Extract k ₁ bits at equal intervals from the transmission bit stream (b ₁ ,...,b _K ) as a mapping bit set of subcarrier position information The remaining bits are used as the mapping bit set of the M-QAM modulation information

Assuming k ₁ =3, k ₂ =6, the mapped result obtained by the centralized bit mapping can be understood by referring to Table 5:

Table 5 Centralized bitmap

Before mapping b₁ b₂ b₃ b₄ b₅ b₆ b₇ b₈ b₉ After mapping p₁ q₁ q₂ p₂ q₃ q₄ p₃ q₅ q₆

It can be read from Table 5 that when k ₁ =3, k ₂ =6, p ₁ , p ₂ and p ₃ are equally spaced between q ₁ , q ₂ , q ₃ , q ₄ , q ₅ , q ₆ middle.

After bit mapping, the mapping bit set of M-QAM modulation information Mapped to m modulation symbols (x ₁ ,...,x _m ).

Then, according to the mapping bit set of the sub-carrier position information Determine the number of the m subcarriers from the preset subcarrier mapping table, map (x ₁ , . . . , x _m ) modulation symbols to the subcarriers corresponding to the numbers, and the subcarrier mapping table is used to reflect all the The mapping bit set of the subcarrier position information is associated with the number of the subcarriers.

The subcarrier mapping table is pre-set at the transmitter and receiver.

For example: when n=4, m=2, k ₁ =2, the subcarrier mapping table is as follows:

Table 6 Subcarrier mapping (n=4, m=2, k ₁ =2)

Referring to Table 6, it can be seen that the mapping bit set of the subcarrier location information includes four cases, 00, 01, 10 and 11, each of which corresponds to a group of subcarrier numbers. You can refer to the following rules for understanding:

(1) Mapping bit set for each group of subcarrier position information Choose a unique set of corresponding subcarrier numbers: {c ₁ ,...,c _m },

where c _i ∈ {1,…,n}, And c _i ≠c _j , i≠j.

(2) Each set {c ₁ ,...,c _m } satisfies min(|c _i -c _j |) to the maximum (i≠j).

Referring to Table 6, it can be understood that the number {1, 4} corresponding to 00 is preferably selected, so as to ensure that the interval between the two subcarriers carrying data is the largest and the interference is the smallest.

Table 6 takes the example of selecting two subcarriers to carry data. When only one subcarrier is selected to carry data, you can refer to the example in Table 7 for understanding:

Assuming n=8, m=1, k1=3, the subcarrier mapping table is as follows:

Table 7 Subcarrier mapping (n=8, m=1, k1=3)

It can be seen from Table 7 that when only one subcarrier is selected for carrying data, there is no inter-subcarrier interference within the transmission bandwidth. Therefore, any subcarrier in Table 7 can be selected for carrying data.

After the m (x ₁ ,...,x _m ) modulation symbols are mapped to the subcarriers corresponding to the numbers, the frequency domain signal is transformed into a time domain signal by inverse fast Fourier transformation (IFFT, Inverse Fast Fourier Transformation). . Then through parallel-serial conversion, the parallel data blocks are transformed into serial data streams. A cyclic prefix (Cycle Prefix, CP) for anti-multipath is added to the header of the data stream, and then the data stream is sent out.

The above is the data processing process at the transmitting end in the embodiment of the present invention. The transmitting end may only occupy part of the subcarriers to transmit data, thereby increasing the interval between subcarriers and reducing the interference between subcarriers. Moreover, when at least two subcarriers are occupied, the interval between the subcarriers for carrying data is made as large as possible, thereby further reducing the interference between the subcarriers.

The solutions provided by the embodiments of the present invention can also reduce inter-cell interference, because in the case of multiple cells, the probability of collision between sub-carriers of the current cell and neighboring cells is reduced, so the inter-cell interference is reduced.

Referring to FIG. 2, an embodiment of the method for signal reception provided in the embodiment of the present invention includes:

At the receiving end, after receiving the data stream carried on the subcarrier, the receiving end first removes the cyclic prefix (Cycle Prefix, CP) used for anti-multipath, and then converts the serial data stream into parallel data blocks. Then, the time domain signal is transformed into a frequency domain signal through a Fast Fourier Transformation (Fast Fourier Transformation, FFT).

The receiving end can obtain the total number n of subcarriers on the transmission channel in advance through the following two methods.

Method 1: If the transmission bandwidth is fixed, the receiving end can directly know the n value, such as IEEE 802.11n/g.

Method 2: If the transmission bandwidth is variable, the sender notifies the receiver of the n value through a dedicated control channel, such as LTE.

Then, the process of channel estimation is performed. The channel estimation is to estimate the channel response h(k) on the data subcarriers through the pilot frequency, where k is the subcarrier number, and k=1,...,n.

The receiver can obtain the subcarrier sparsity coefficient δ in the following two ways:

Method 1: The receiving end blindly detects the number m of M-QAM modulated subcarriers through information such as subcarrier power, so as to estimate the subcarrier sparsity coefficient δ.

Method 2: The transmitting end notifies the receiving terminal of the carrier sparsity coefficient δ through a dedicated control channel or a high-level message, and a semi-static configuration can be used to reduce signaling overhead. For example, the subcarrier sparsity coefficient δ is sent once in a certain period, such as 15 minutes or 30 minutes.

Calculate the number of M-QAM modulated subcarriers m=n·δ.

Through a signal detection algorithm, such as a log-likelihood ratio (LLR, Log-Likelihood Ratio) algorithm, a set of subcarrier numbers belonging to _M -QAM modulation is detected: {c ₁ ,...,cm }.

The specific process is: set the received signal model as:

r(k)=h(k) x(k)+n(k)

where x(k) is the transmitted signal on subcarrier k, h(k) is the channel response on subcarrier k, r(k) is the received signal on subcarrier k, and n(k) is the signal on subcarrier k noise with variance σ ² . The value of x(k): s _i or 0, s _i ∈ S——S is the set of M-QAM modulation constellation points, k=1,...,n——subcarrier number.

Define the log-likelihood ratio:

λ(k) reflects the ratio of the probability of the M-QAM modulated signal to the probability of x(k)=0 under the condition that r(k) is received.

Using the Bayesian formula and the total probability formula, and the conditional probability density function of r(k) obeys the complex Gaussian distribution, it can be simplified to:

The first m sub-carriers with the largest λ(k) are selected to be M-QAM modulated sub-carriers, thereby obtaining an M-QAM modulated sub-carrier number set: _{ c ₁ ,...,cm }.

After obtaining the subcarrier number set of _M -QAM modulation: {c ₁ ,...,cm }, the subcarrier position information bit set can be demapped through the number set and the subcarrier mapping table of the transmitting end. For example: when the number is {1, 4}, it can be obtained that the mapping bit set of the corresponding subcarrier position information is 00 according to Table 6.

Then, frequency domain equalization is performed on m M-QAM modulated sub-carriers by channel estimation, and m frequency-domain equalized modulation symbols (x ₁ , . . . , x _m ) are obtained.

Demodulate the m frequency-domain equalized modulation symbols (x ₁ ,...,x _m ) to obtain a mapping bit set of M-QAM modulation information

Then, through bit demapping, the mapped bit set of the subcarrier position information is and M-QAM modulation information mapping bit set Combined into the original transport bitstream (b ₁ , . . . , b _K ).

In the above, the signal receiving method provided by the embodiment of the present invention only needs to demodulate data from some subcarriers, thereby improving the speed of demodulation.

Referring to FIG. 3 , an embodiment of a signal sending apparatus 30 provided by an embodiment of the present invention includes:

a selection unit 301, configured to select m subcarriers for carrying data to be transmitted from n subcarriers on a transmission channel, where m is greater than or equal to 1, and n is greater than m;

a modulation unit 302, configured to modulate the data to be transmitted into a modulation signal, and map the modulation signal to the m subcarriers selected by the selection unit 301;

The sending unit 303 is configured to send the modulated signal modulated by the modulating unit 302 through the m subcarriers.

In this embodiment of the present invention, the selection unit 301 selects m subcarriers for carrying data to be transmitted from the n subcarriers on the transmission channel, where m is greater than or equal to 1, and n is greater than m; the modulation unit 302 The data to be transmitted is modulated into a modulated signal, and the modulated signal is mapped to the m subcarriers selected by the selection unit 301; the sending unit 303 sends the modulated signal by the modulation unit 302 through the m subcarriers the modulated signal. Compared with the prior art that occupies all sub-carriers in the channel to send data, the device for signal transmission provided by the embodiment of the present invention can only occupy part of the sub-carriers to send data, thereby increasing the sparsity between sub-carriers and reducing the number of sub-carriers. Inter-carrier interference.

Optionally, on the basis of the embodiment corresponding to FIG. 3 above, referring to FIG. 4 , in another embodiment of the apparatus 30 for signal transmission provided by the embodiment of the present invention, the apparatus 30 further includes:

The first determining unit 304 is configured to, before the selecting unit 301 selects m sub-carriers for carrying data to be transmitted, determine the sub-carrier sparsity coefficient according to the determination information of the sub-carrier sparsity coefficient, the sub-carrier sparsity coefficient The sparsity coefficient is the ratio of m to n;

The second determining unit 305 is configured to determine the m according to the subcarrier sparsity coefficient and the n determined by the first determining unit 304 .

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 4 , in another embodiment of the apparatus 30 for signal transmission provided in the embodiment of the present invention,

The first determining unit 304 is configured to determine the subcarrier sparsity coefficient according to the association relationship between preset communication scene information and the subcarrier sparsity coefficient, where the communication scene information includes the distance between the transmitting end and the receiving end , the moving speed of the receiving end relative to the transmitting end, and the load information of the serving cell serving the transmitting end or the receiving end.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 4 , in another embodiment of the apparatus 30 for signal transmission provided in the embodiment of the present invention,

The first determining unit 304 is configured to determine a trade-off balance weight coefficient according to the device type of the transmitting end, where the trade-off balance weight coefficient is used to reflect the importance of the energy efficiency ratio; the sub-carrier sparsity coefficient is determined according to the energy efficiency function , the energy efficiency function is a compromise optimization objective function between spectral efficiency and energy efficiency ratio, and when the energy efficiency function reaches a maximum value, the sparsity coefficient of the corresponding subcarrier is the subcarrier sparsity coefficient.

Optionally, on the basis of the embodiment corresponding to FIG. 4 above, referring to FIG. 5 , in another embodiment of the apparatus 30 for signal transmission provided by the embodiment of the present invention, the apparatus 30 further includes:

The third determining unit 306 is configured to determine, according to the sub-carrier sparsity coefficient and the n determined by the first determining unit 304, the number of bits k 1 of the sub-carrier position information of the m sub-carriers and the number of bits of the modulation information k ₁ the number of bits k ₂ ;

The obtaining unit 307 is configured to perform bit mapping according to the k ₁ and k ₂ determined by the third determining unit 306 according to the preset mapping mode, to obtain the mapping bit set of the subcarrier position information and the mapping bit set of the modulation information .

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 5 , in another embodiment of the apparatus 30 for signal transmission provided in the embodiment of the present invention,

The modulating unit 302 is configured to modulate the mapping bit set of the modulation information obtained by the obtaining unit onto m modulation symbols, and determine according to the mapping bit set of the subcarrier position information obtained by the obtaining unit. The number of the m subcarriers, the m modulation symbols are mapped to the m subcarriers corresponding to the number, and one of the m modulation symbols is mapped on each of the m subcarriers .

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 5 , in another embodiment of the apparatus 30 for signal transmission provided in the embodiment of the present invention,

The modulation unit 302 is configured to determine the number of the m subcarriers from a preset subcarrier mapping table according to the mapping bit set of the subcarrier position information, where the subcarrier mapping table is used to reflect the subcarriers The mapping bit set of carrier location information is associated with the number of subcarriers.

The process performed by the apparatus for sending a signal can be understood by referring to the content corresponding to FIG. 1 , and details are not described here.

Referring to FIG. 6, an embodiment of a signal receiving apparatus 40 provided by an embodiment of the present invention includes:

a receiving unit 401, configured to receive a modulated signal carried on a subcarrier;

a determining unit 402, configured to determine m subcarriers carrying the modulated signal received by the receiving unit 401 from the n subcarriers on the transmission channel, where m is greater than or equal to 1, and n is greater than m;

The demodulation unit 403 is configured to demodulate the modulated signal from the m subcarriers determined by the determination unit 402 to obtain the data sent by the transmitting end.

In this embodiment of the present invention, the receiving unit 401 receives the modulated signal carried on the subcarriers, and the determining unit 402 determines m subcarriers carrying the modulated signal received by the receiving unit 401 from the n subcarriers on the transmission channel, so If the m is greater than or equal to 1, and the n is greater than the m, the demodulation unit 403 demodulates the modulated signal from the m sub-carriers determined by the determination unit 402 to obtain the data sent by the transmitter. Compared with the prior art that needs to demodulate data from each subcarrier, the signal receiving apparatus provided by the embodiment of the present invention only needs to demodulate data from some subcarriers, thereby improving the demodulation speed.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 6, referring to FIG. 7, in another embodiment of the signal receiving apparatus 40 provided by the embodiment of the present invention, the apparatus 40 further includes: an obtaining unit 404,

The obtaining unit 404 is configured to obtain the subcarrier sparsity coefficient;

The determining unit 402 is configured to, according to the subcarrier sparsity coefficient acquired by the acquiring unit 404, determine m subcarriers carrying modulated signals from the n subcarriers on the transmission channel.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 7 , in another embodiment of the signal receiving device 40 provided by the embodiment of the present invention,

The obtaining unit 404 is configured to blindly detect the m through the sub-carrier power, and determine the sub-carrier sparsity coefficient according to the m and n.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 7 , in another embodiment of the signal receiving device 40 provided by the embodiment of the present invention,

The obtaining unit 404 is configured to receive the subcarrier sparsity coefficient sent by the sending end through a dedicated control channel or a higher layer message.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 7 , in another embodiment of the signal receiving device 40 provided by the embodiment of the present invention,

The determining unit 402 is further configured to determine the numbers of the m sub-carriers through a signal detection algorithm;

The demodulating unit 403 is configured to demodulate the modulated signal from the m sub-carriers corresponding to the numbers according to the numbers of the m sub-carriers determined by the determining unit 402 to obtain the data sent by the transmitting end.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 7 , in another embodiment of the signal receiving device 40 provided by the embodiment of the present invention,

The determining unit 402 is configured to determine, according to the numbers of the m subcarriers, a mapping bit set of subcarrier position information from a preset subcarrier mapping table, where the subcarrier mapping table is used to reflect the subcarrier positions The mapping bit set of information is associated with the corresponding number of sub-carriers.

Optionally, on the basis of the above-mentioned embodiment corresponding to FIG. 7 , in another embodiment of the signal receiving device 40 provided by the embodiment of the present invention,

The demodulation unit 402 is configured to perform frequency domain equalization on the m subcarriers to obtain m frequency-domain equalized modulation symbols, and demodulate the m frequency-domain equalized modulation symbols to obtain modulation information The mapping bit set of the subcarrier position information and the mapping bit set of the modulation information are aggregated into the data sent by the transmitting end.

Referring to FIG. 8 , another embodiment of the method for sending a signal provided by an embodiment of the present invention includes:

501. Select m subcarriers for carrying data to be transmitted from n subcarriers on a transmission channel, where m is greater than or equal to 1, and n is greater than m.

502. Modulate the data to be transmitted into a modulated signal, and map the modulated signal onto the m subcarriers.

503. Send the modulated signal through the m subcarriers.

In this embodiment of the present invention, m subcarriers for carrying data to be transmitted are selected from n subcarriers on a transmission channel, where m is greater than or equal to 1, and n is greater than m, and the data to be transmitted is selected as m subcarriers. The modulated signal is modulated into a modulated signal, the modulated signal is mapped onto the m subcarriers, and the modulated signal is sent through the m subcarriers. Compared with the prior art that occupies all subcarriers in the channel to send data, the method provided by the embodiment of the present invention can only occupy part of the subcarriers to send data, so that the probability of sending collisions between subcarriers is reduced, and the transmission collision between subcarriers is reduced. interference.

Optionally, on the basis of the embodiment corresponding to the foregoing FIG. 8 , in an optional embodiment of the method for signal transmission provided by the embodiment of the present invention, the selected sub-carriers from the n sub-carriers on the transmission channel are used to carry the signal. Before the m subcarriers of the data to be transmitted, the method may further include:

determining the subcarrier sparsity coefficient according to the determination information of the subcarrier sparsity coefficient, where the subcarrier sparsity coefficient is a ratio of m to n;

The m is determined according to the subcarrier sparsity coefficient and the n.

Optionally, on the basis of the above-mentioned optional embodiment corresponding to FIG. 8 , in another optional embodiment of the method for signal transmission provided by the embodiment of the present invention, the determination is based on the determination information of the subcarrier sparsity coefficient. The subcarrier sparsity coefficient may include:

The subcarrier sparsity coefficient is determined according to the association relationship between preset communication scene information and the subcarrier sparsity coefficient, where the communication scene information includes the distance between the sender and the receiver, the speed at which the receiver moves relative to the sender, and Load information of the serving cell serving the sender or the receiver.

Optionally, on the basis of the above-mentioned optional embodiment corresponding to FIG. 8 , in another optional embodiment of the method for signal transmission provided by the embodiment of the present invention, the determination is based on the determination information of the subcarrier sparsity coefficient. The subcarrier sparsity coefficient may include:

Determine a trade-off balance weight coefficient according to the device type of the sender, where the trade-off balance weight coefficient is used to reflect the importance of the energy efficiency ratio;

The subcarrier sparsity coefficient is determined according to an energy efficiency function, which is a compromise optimization objective function between spectral efficiency and energy efficiency ratio, and when the energy efficiency function reaches a maximum value, the sparsity coefficient of the corresponding subcarrier is the Subcarrier sparsity coefficient.

Optionally, on the basis of the optional embodiment corresponding to FIG. 8 above, in another optional embodiment of the method for sending a signal provided by the embodiment of the present invention, the to-be-transmitted data is modulated to the m before the number of subcarriers, the method may further include:

According to the sub-carrier sparsity coefficient and the n, determine the number of bits k ₁ of the sub-carrier position information and the number of bits of modulation information k ₂ of the data that need to be carried in the m sub-carriers;

According to the k ₁ and k ₂ , bit mapping is performed according to a preset mapping mode to obtain a mapped bit set of subcarrier position information and a mapped bit set of modulation information.

Optionally, on the basis of the optional embodiment corresponding to FIG. 8 above, in another optional embodiment of the method for sending a signal provided by the embodiment of the present invention, the to-be-transmitted data is modulated to the m On subcarriers, it can include:

modulating the mapping bit set of the modulation information onto m modulation symbols;

determining the number of the m subcarriers according to the mapping bit set of the subcarrier position information;

The m modulation symbols are mapped to the m subcarriers corresponding to the numbers, and one of the m modulation symbols is mapped to each of the m subcarriers.

Optionally, on the basis of the above-mentioned optional embodiment corresponding to FIG. 8 , in another optional embodiment of the signal sending method provided by the embodiment of the present invention, the mapping bit set according to the subcarrier position information , determine the number of the m subcarriers, which may include:

According to the mapping bit set of the sub-carrier position information, the number of the m sub-carriers is determined from a preset sub-carrier mapping table, and the sub-carrier mapping table is used to reflect the mapping bit set of the sub-carrier position information and Corresponding association of subcarrier numbers.

The method of signal transmission can be understood by referring to the content corresponding to FIG. 1 , and details are not described here.

Referring to FIG. 9, an embodiment of a signal receiving method provided by an embodiment of the present invention includes:

601. Receive a modulated signal carried on a subcarrier.

602. From the n subcarriers on the transmission channel, determine m subcarriers carrying the modulated signal, where m is greater than or equal to 1, and n is greater than m.

603. Demodulate the modulated signal from the m subcarriers to obtain the data sent by the sending end.

In this embodiment of the present invention, modulated signals carried on subcarriers are received, and m subcarriers carrying modulated signals are determined from n subcarriers on the transmission channel, where m is greater than or equal to 1, and n is greater than m , demodulate the modulated signal from the m subcarriers to obtain the data sent by the sender. Compared with the prior art, which needs to demodulate data from each subcarrier, the demodulation method provided by the embodiment of the present invention only needs to demodulate data from some subcarriers, thereby improving the demodulation speed.

Optionally, on the basis of the embodiment corresponding to FIG. 9 above, in another embodiment of the signal receiving method provided by the embodiment of the present invention, the n subcarriers on the slave transmission channel are determined to carry modulated signals. Before the m subcarriers, the method may further include:

Get the subcarrier sparsity coefficient;

The determining from the n subcarriers on the transmission channel the m subcarriers carrying the modulated signal may include:

According to the subcarrier sparsity coefficient, m subcarriers carrying modulated signals are determined from the n subcarriers on the transmission channel.

Optionally, based on the optional embodiment corresponding to FIG. 9 above, in another embodiment of the signal receiving method provided by the embodiment of the present invention, the obtaining the subcarrier sparsity coefficient may include:

The m is blindly detected by sub-carrier power, and the sub-carrier sparsity coefficient is determined according to the m and n.

Optionally, based on the optional embodiment corresponding to FIG. 9 above, in another embodiment of the signal receiving method provided by the embodiment of the present invention, the obtaining the subcarrier sparsity coefficient may include:

The subcarrier sparsity coefficient sent by the sending end is received through a dedicated control channel or a higher layer message.

Optionally, on the basis of the above-mentioned optional embodiment corresponding to FIG. 9 , in another embodiment of the signal receiving method provided by the embodiment of the present invention, before the demodulation of the data from the m subcarriers , the method may also include:

Determine the number of the m subcarriers by a signal detection algorithm;

The demodulation of the modulated signal from the m sub-carriers to obtain the data sent by the sender includes:

According to the numbers of the m subcarriers, the modulated signal is demodulated from the m subcarriers corresponding to the numbers to obtain the data sent by the transmitting end.

Optionally, on the basis of the optional embodiment corresponding to FIG. 9 above, in another embodiment of the signal receiving method provided by the embodiment of the present invention, the number of the m subcarriers is determined by the signal detection algorithm. Afterwards, the method may further include:

According to the number of the m sub-carriers, the mapping bit set of the sub-carrier position information is determined from the preset sub-carrier mapping table, and the sub-carrier mapping table is used to reflect the mapping bit set of the sub-carrier position information and the sub-carriers The corresponding association of the number.

Optionally, on the basis of the optional embodiment corresponding to FIG. 9 above, in another embodiment of the signal receiving method provided by the embodiment of the present invention, the number of the m sub-carriers is based on the number of the corresponding number. Demodulating the modulated signal on the m subcarriers to obtain the data sent by the sender, which may include:

Perform frequency domain equalization on the m subcarriers to obtain m frequency-domain equalized modulation symbols.

demodulating the m frequency-domain equalized modulation symbols to obtain a mapping bit set of modulation information;

The mapping bit set of the subcarrier position information and the mapping bit set of the modulation information are aggregated into data sent by the sending end.

The method of signal reception can be understood by referring to the content corresponding to FIG. 2 , and details are not described here.

The process performed by the apparatus for signal receiving can be understood by referring to the content corresponding to FIG. 2 , and details are not repeated here.

FIG. 10 is a schematic structural diagram of an apparatus 30 for transmitting a signal according to an embodiment of the present invention. The apparatus 30 for signaling may include an input device 310 , an output device 320 , a processor 330 and a memory 340 .

Memory 340 may include read-only memory and random access memory, and provides instructions and data to processor 330 . A portion of memory 340 may also include non-volatile random access memory (NVRAM).

The memory 340 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

Operation instructions: including various operation instructions, which are used to realize various operations.

Operating System: Includes various system programs for implementing various basic services and handling hardware-based tasks.

In this embodiment of the present invention, the processor 330 performs the following operations by invoking an operation instruction stored in the memory 340 (the operation instruction may be stored in the operating system):

From the n subcarriers on the transmission channel, select m subcarriers for carrying data to be transmitted, where m is greater than or equal to 1, and n is greater than m;

modulating the data to be transmitted into a modulated signal, and mapping the modulated signal onto the m subcarriers;

The modulated signal is transmitted through the m subcarriers.

In the embodiment of the present invention, the apparatus 30 for signal transmission provided in the embodiment of the present invention may only occupy part of the subcarriers to transmit data, thereby increasing the sparsity among the subcarriers and reducing the interference between the subcarriers.

The processor 330 controls the operation of the apparatus 30 for sending signals, and the processor 330 may also be referred to as a CPU (Central Processing Unit, central processing unit). Memory 340 may include read-only memory and random access memory, and provides instructions and data to processor 330 . A portion of memory 340 may also include non-volatile random access memory (NVRAM). In a specific application, various components of the signal sending device 30 are coupled together through a bus system 350, where the bus system 350 may include a power bus, a control bus, a status signal bus, and the like in addition to a data bus. However, for the sake of clarity, the various buses are labeled as bus system 350 in the figure.

The methods disclosed in the above embodiments of the present invention may be applied to the processor 330 or implemented by the processor 330 . The processor 330 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method may be completed by an integrated logic circuit of hardware in the processor 330 or an instruction in the form of software. The above-mentioned processor 330 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory 340, and the processor 330 reads the information in the memory 340, and completes the steps of the above method in combination with its hardware.

Optionally, the processor 330 is further configured to:

determining the subcarrier sparsity coefficient according to the determination information of the subcarrier sparsity coefficient, where the subcarrier sparsity coefficient is a ratio of m to n;

The m is determined according to the subcarrier sparsity coefficient and the n.

Optionally, the processor 330 is specifically configured to:

The subcarrier sparsity coefficient is determined according to the association relationship between preset communication scene information and the subcarrier sparsity coefficient, where the communication scene information includes the distance between the sender and the receiver, the speed at which the receiver moves relative to the sender, and Load information of the serving cell serving the sender or the receiver.

Optionally, the processor 330 is specifically configured to:

Determine a trade-off balance weight coefficient according to the device type of the sender, where the trade-off balance weight coefficient is used to reflect the importance of the energy efficiency ratio;

The subcarrier sparsity coefficient is determined according to an energy efficiency function, which is a compromise optimization objective function between spectral efficiency and energy efficiency ratio, and when the energy efficiency function reaches a maximum value, the sparsity coefficient of the corresponding subcarrier is the Subcarrier sparsity coefficient.

Optionally, the processor 330 is further configured to:

According to the sub-carrier sparsity coefficient and the n, determine the number of bits k ₁ of sub-carrier position information and the number of bits of modulation information k ₂ of the m sub-carriers;

According to the k ₁ and k ₂ , bit mapping is performed according to a preset mapping mode to obtain a mapped bit set of subcarrier position information and a mapped bit set of modulation information.

Optionally, the processor 330 is specifically configured to:

modulating the mapping bit set of the modulation information onto m modulation symbols;

determining the number of the m subcarriers according to the mapping bit set of the subcarrier position information;

The m modulation symbols are mapped to the m subcarriers corresponding to the numbers, and one of the m modulation symbols is mapped to each of the m subcarriers.

Optionally, the processor 330 is specifically configured to:

According to the mapping bit set of the sub-carrier position information, the number of the m sub-carriers is determined from a preset sub-carrier mapping table, and the sub-carrier mapping table is used to reflect the mapping bit set of the sub-carrier position information and Corresponding association of subcarrier numbers.

FIG. 11 is a schematic structural diagram of a signal receiving apparatus 40 according to an embodiment of the present invention. The signal receiving apparatus 40 may include an input device 410 , an output device 420 , a processor 430 and a memory 440 .

Memory 440 may include read-only memory and random access memory, and provides instructions and data to processor 430 . A portion of memory 440 may also include non-volatile random access memory (NVRAM).

Memory 440 stores the following elements, executable modules or data structures, or subsets thereof, or extensions thereof:

Operation instructions: including various operation instructions, which are used to realize various operations.

Operating System: Includes various system programs for implementing various basic services and handling hardware-based tasks.

In this embodiment of the present invention, the processor 430 performs the following operations by invoking the operation instructions stored in the memory 440 (the operation instructions may be stored in the operating system):

receive the modulated signal carried on the sub-carrier through the input device 410;

From the n subcarriers on the transmission channel, determine m subcarriers carrying modulated signals, where m is greater than or equal to 1, and n is greater than m;

The modulated signal is demodulated from the m subcarriers to obtain the data sent by the sender.

In the embodiment of the present invention, the signal receiving apparatus 40 provided in the embodiment of the present invention only needs to demodulate data from some subcarriers, thereby improving the speed of demodulation.

The processor 430 controls the operation of the signal receiving apparatus 40, and the processor 430 may also be referred to as a CPU (Central Processing Unit, central processing unit). Memory 440 may include read-only memory and random access memory, and provides instructions and data to processor 430 . A portion of memory 440 may also include non-volatile random access memory (NVRAM). In a specific application, various components of the signal receiving apparatus 40 are coupled together through a bus system 450, wherein the bus system 450 may include a power bus, a control bus, a status signal bus, and the like in addition to a data bus. However, for the sake of clarity, the various buses are labeled as bus system 450 in the figure.

The methods disclosed in the above embodiments of the present invention may be applied to the processor 430 or implemented by the processor 430 . The processor 430 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method can be completed by an integrated logic circuit of hardware in the processor 430 or an instruction in the form of software. The above-mentioned processor 430 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory 440, and the processor 430 reads the information in the memory 440, and completes the steps of the above method in combination with its hardware.

Optionally, the processor 430 is further configured to:

Get the subcarrier sparsity coefficient;

Determining m sub-carriers carrying modulated signals from the n sub-carriers on the transmission channel, including:

According to the subcarrier sparsity coefficient, m subcarriers carrying modulated signals are determined from the n subcarriers on the transmission channel.

Optionally, the processor 430 is specifically configured to:

The m is blindly detected by sub-carrier power, and the sub-carrier sparsity coefficient is determined according to the m and n.

Optionally, the input device 410 is also used for:

The subcarrier sparsity coefficient sent by the sending end is received through a dedicated control channel or a higher layer message

Optionally, the processor 430 is further configured to:

Determine the number of the m subcarriers by a signal detection algorithm;

The demodulation of the modulated signal from the m sub-carriers to obtain the data sent by the sender includes:

According to the numbers of the m subcarriers, the modulated signal is demodulated from the m subcarriers corresponding to the numbers to obtain the data sent by the transmitting end.

Optionally, the processor 430 is further configured to:

According to the number of the m sub-carriers, the mapping bit set of the sub-carrier position information is determined from the preset sub-carrier mapping table, and the sub-carrier mapping table is used to reflect the mapping bit set of the sub-carrier position information and the sub-carriers The corresponding association of the number.

Optionally, the processor 430 is specifically configured to:

Perform frequency domain equalization on the m subcarriers to obtain m frequency-domain equalized modulation symbols;

demodulating the m frequency-domain equalized modulation symbols to obtain a mapping bit set of modulation information;

The mapping bit set of the subcarrier position information and the mapping bit set of the modulation information are aggregated into data sent by the sending end.

Referring to FIG. 12, an embodiment of a system for signal transmission provided by an embodiment of the present invention includes: a signal sending device 30 and a signal receiving device 40,

The signal sending device 30 is configured to select m subcarriers for carrying data to be transmitted from the n subcarriers on the transmission channel, where m is greater than or equal to 1, and n is greater than m, and the The data to be transmitted is modulated into a modulated signal, and the modulated signal is mapped onto the m subcarriers. sending the modulated signal through the m subcarriers;

The signal receiving device 40 is configured to receive a modulated signal carried on a subcarrier, and from the n subcarriers on the transmission channel, determine m subcarriers carrying the modulated signal, where m is greater than or equal to 1, and the When n is greater than the m, the modulated signal is demodulated from the m subcarriers to obtain the data sent by the transmitter.

The signal transmission system provided by the embodiment of the present invention can only occupy part of the subcarriers to transmit data, thereby increasing the sparsity among the subcarriers and reducing the interference between the subcarriers.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, magnetic disk or optical disk, etc.

The methods, devices, and systems for sending and receiving signals provided by the embodiments of the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The descriptions of the above embodiments are only used to help Understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification does not It should be understood as a limitation of the present invention.

Claims (25)

1. An apparatus for signaling, comprising:

a first determining unit, configured to determine a subcarrier sparsity coefficient according to determination information of the subcarrier sparsity coefficient, where the subcarrier sparsity coefficient is a ratio of m to n, m is greater than or equal to 1, and n is greater than m;

a second determining unit configured to determine the m according to the subcarrier sparsity coefficient and the n determined by the first determining unit;

a selecting unit, configured to select m subcarriers used for carrying data to be transmitted from the n subcarriers on a transmission channel;

the modulation unit is used for modulating the data to be transmitted into modulation signals and mapping the modulation signals to the m subcarriers selected by the selection unit;

a transmitting unit, configured to transmit the modulated signal modulated by the modulating unit through the m subcarriers.

2. The apparatus of claim 1,

the first determining unit is configured to determine the subcarrier sparsity coefficient according to an association relationship between preset communication scenario information and the subcarrier sparsity coefficient, where the communication scenario information includes a distance between a transmitting end and a receiving end, a moving speed of the receiving end relative to the transmitting end, and load information of a serving cell providing service for the transmitting end or the receiving end.

3. The apparatus of claim 1,

the first determining unit is configured to determine an compromise balance weight coefficient according to a device type of a sending end, where the compromise balance weight coefficient is used to reflect an importance degree of an energy efficiency ratio; and determining the subcarrier sparsity coefficient according to an energy efficiency function, wherein the energy efficiency function is a compromise optimization objective function of the spectrum efficiency and the energy efficiency ratio, and when the energy efficiency function reaches the maximum value, the corresponding subcarrier sparsity coefficient is the subcarrier sparsity coefficient.

4. The apparatus of any of claims 1-3, further comprising:

a third determining unit configured to determine the number k of bits of the subcarrier position information of the m subcarriers based on the subcarrier sparsity coefficient determined by the first determining unit and the n₁And the number k of bits of the modulation information₂；

Obtain a sheetAn element for determining k according to the third determination unit₁And k₂And carrying out bit mapping according to a preset mapping mode to obtain a mapping bit set of the subcarrier position information and a mapping bit set of the modulation information.

5. The apparatus of claim 4,

the modulation unit is configured to modulate the mapping bit set of the modulation information obtained by the obtaining unit onto m modulation symbols, determine the number of the m subcarriers according to the mapping bit set of the subcarrier position information obtained by the obtaining unit, map the m modulation symbols onto the m subcarriers corresponding to the number, and map one of the m modulation symbols onto each subcarrier of the m subcarriers.

6. The apparatus of claim 5,

the modulation unit is configured to determine the numbers of the m subcarriers from a preset subcarrier mapping table according to the mapping bit sets of the subcarrier position information, where the subcarrier mapping table is used to reflect the corresponding association between the mapping bit sets of the subcarrier position information and the numbers of the subcarriers.

7. An apparatus for signal reception, comprising:

a receiving unit, configured to receive a modulated signal carried on a subcarrier;

an obtaining unit, configured to obtain a subcarrier sparsity coefficient;

a determining unit, configured to determine m subcarriers carrying modulation signals from n subcarriers on a transmission channel according to the subcarrier sparsity coefficient obtained by the obtaining unit, where m is greater than or equal to 1, and n is greater than m;

and the demodulation unit is used for demodulating the modulation signal from the m subcarriers determined by the determination unit to obtain data sent by a sending end.

8. The apparatus of claim 7,

the obtaining unit is configured to blindly detect the m through subcarrier power, and determine the subcarrier sparsity coefficient according to the m and the n.

9. The apparatus of claim 7,

the obtaining unit is configured to receive the subcarrier sparsity coefficient sent by the sending end through a dedicated control channel or a high-level message.

10. The apparatus according to any one of claims 7 to 9,

the determining unit is further configured to determine the number of the m subcarriers by using a signal detection algorithm;

the demodulation unit is configured to demodulate the modulation signal from the m subcarriers with the corresponding numbers according to the numbers of the m subcarriers determined by the determination unit, so as to obtain data sent by a sending end.

11. The apparatus of claim 10,

the determining unit is configured to determine, according to the numbers of the m subcarriers, a mapping bit set of subcarrier position information from a preset subcarrier mapping table, where the subcarrier mapping table is used to reflect a corresponding association between the mapping bit set of the subcarrier position information and the numbers of the subcarriers.

12. The apparatus of claim 11,

the demodulation unit is configured to perform frequency domain equalization on the m subcarriers to obtain m modulation symbols after the frequency domain equalization, demodulate the m modulation symbols after the frequency domain equalization to obtain a mapping bit set of modulation information, and aggregate the mapping bit set of the subcarrier position information and the mapping bit set of the modulation information into data sent by the sending end.

13. A method of signaling, comprising:

determining a subcarrier sparsity coefficient according to determination information of the subcarrier sparsity coefficient, wherein the subcarrier sparsity coefficient is a ratio of m to n, m is greater than or equal to 1, and n is greater than m;

determining the m according to the subcarrier sparsity coefficient and the n;

selecting the m subcarriers for carrying data to be transmitted from the n subcarriers on the transmission channel;

modulating the data to be transmitted into a modulation signal, and mapping the modulation signal to the m subcarriers;

and transmitting the modulation signal through the m subcarriers.

14. The method according to claim 13, wherein said determining the subcarrier sparsity coefficients according to the determination information of the subcarrier sparsity coefficients comprises:

and determining the subcarrier sparsity coefficient according to the incidence relation between preset communication scene information and the subcarrier sparsity coefficient, wherein the communication scene information comprises the distance between a sending end and a receiving end, the moving speed of the receiving end relative to the sending end and the load information of a service cell providing service for the sending end or the receiving end.

15. The method according to claim 13, wherein said determining the subcarrier sparsity coefficients according to the determination information of the subcarrier sparsity coefficients comprises:

determining an compromise balance weight coefficient according to the equipment type of a sending end, wherein the compromise balance weight coefficient is used for reflecting the importance degree of the energy efficiency ratio;

and determining the subcarrier sparsity coefficient according to an energy efficiency function, wherein the energy efficiency function is a compromise optimization objective function of the spectrum efficiency and the energy efficiency ratio, and when the energy efficiency function reaches the maximum value, the corresponding subcarrier sparsity coefficient is the subcarrier sparsity coefficient.

16. The method according to any of claims 13-15, wherein before modulating the data to be transmitted onto the m subcarriers, the method further comprises:

determining the bit number k of the subcarrier position information of the m subcarriers according to the subcarrier sparsity coefficient and the n₁And the number k of bits of the modulation information₂；

According to the k₁And k₂And carrying out bit mapping according to a preset mapping mode to obtain a mapping bit set of the subcarrier position information and a mapping bit set of the modulation information.

17. The method of claim 16, wherein modulating the data to be transmitted onto the m subcarriers comprises:

modulating the mapping bit set of the modulation information onto m modulation symbols;

determining the number of the m subcarriers according to the mapping bit set of the subcarrier position information;

mapping the m modulation symbols to the m subcarriers corresponding to the numbers, and mapping one of the m modulation symbols on each subcarrier of the m subcarriers.

18. The method of claim 17, wherein the determining the number of the m subcarriers according to the mapping bit set of the subcarrier position information comprises:

and determining the number of the m subcarriers from a preset subcarrier mapping table according to the mapping bit set of the subcarrier position information, wherein the subcarrier mapping table is used for reflecting the corresponding association of the mapping bit set of the subcarrier position information and the number of the subcarrier.

19. A method of signal reception, comprising:

receiving a modulated signal carried on a subcarrier;

acquiring a subcarrier sparsity coefficient;

according to the subcarrier sparsity coefficient, m subcarriers carrying the modulation signals are determined from n subcarriers on a transmission channel, wherein m is greater than or equal to 1, and n is greater than m;

and demodulating the modulation signal from the m subcarriers to obtain data sent by a sending end.

20. The method of claim 19, wherein obtaining the subcarrier sparsity coefficients comprises:

and blind detecting the m through the power of the subcarrier, and determining the sparsity coefficient of the subcarrier according to the m and the n.

21. The method of claim 19, wherein obtaining the subcarrier sparsity coefficients comprises:

and receiving the subcarrier sparsity coefficient sent by the sending end through a special control channel or a high-level message.

22. The method according to any of claims 19-21, wherein before said demodulating said data from said m subcarriers, said method further comprises:

determining the number of the m subcarriers by a signal detection algorithm;

the demodulating the modulated signal from the m subcarriers to obtain data sent by a sending end includes:

and demodulating the modulation signal from the m subcarriers with the corresponding numbers according to the numbers of the m subcarriers to obtain data sent by a sending end.

23. The method of claim 22, wherein after determining the number of the m subcarriers by the signal detection algorithm, the method further comprises:

and determining a mapping bit set of the subcarrier position information from a preset subcarrier mapping table according to the number of the m subcarriers, wherein the subcarrier mapping table is used for reflecting the corresponding association of the mapping bit set of the subcarrier position information and the number of the subcarrier.

24. The method according to claim 23, wherein the demodulating, according to the number of the m subcarriers, the modulated signal from the m subcarriers with corresponding numbers to obtain data sent by a sending end comprises:

carrying out frequency domain equalization on the m subcarriers to obtain m modulation symbols after frequency domain equalization;

demodulating the m modulated symbols after frequency domain equalization to obtain a mapping bit set of modulation information;

and aggregating the mapping bit set of the subcarrier position information and the mapping bit set of the modulation information into data sent by the sending end.

25. A system for signal transmission, comprising: a signal transmitting device and a signal receiving device,

the signal sending device is used for determining a subcarrier sparsity coefficient according to determination information of the subcarrier sparsity coefficient, the subcarrier sparsity coefficient is a ratio of m to n, the m is greater than or equal to 1, and the n is greater than the m; determining the m according to the subcarrier sparsity coefficient and the n, selecting the m subcarriers used for bearing data to be transmitted from the n subcarriers on a transmission channel, modulating the data to be transmitted into modulation signals, mapping the modulation signals onto the m subcarriers, and sending the modulation signals through the m subcarriers;

the signal receiving device is configured to obtain a subcarrier sparsity coefficient, determine m subcarriers carrying the modulation signal from n subcarriers on a transmission channel according to the subcarrier sparsity coefficient, where m is greater than or equal to 1, and n is greater than m, receive the modulation signal carried on the subcarriers, determine m subcarriers carrying the modulation signal from n subcarriers on the transmission channel, and demodulate the modulation signal from the m subcarriers to obtain data sent by a sending end.