CN114826837B - A channel estimation method, device, equipment and storage medium - Google Patents

Abstract

The present invention discloses a channel estimation method, device, equipment and storage medium, by extracting all the row coordinates of the rows where all possible non-zero values in the first column of the equivalent channel matrix are located, and extracting the row coordinates corresponding to all row coordinates The column coordinates corresponding to all possible non-zero values generate protection coordinates, and according to the pilot coordinates and protection coordinates, generate the signal transmission sequence of the sending end; send the signal transmission sequence to the receiving end, so that the receiving end can analyze the signal transmission sequence, and obtain A signal receiving sequence: screening pilot symbols in the obtained signal receiving sequence according to a preset threshold value, and performing mapping processing on the screened pilot symbols to obtain channel estimation information. The technical solution of the present invention is based on the cyclic characteristics of the equivalent channel matrix, reasonably sets the pilot frequency and protection symbols in the signal transmission sequence, and performs mapping processing on the pilot frequency symbols screened by the preset threshold value at the receiving end , to improve the accuracy of channel estimation.

Description

A channel estimation method, device, equipment and storage medium

Technical Field

The present invention relates to the technical field of wireless communications, and in particular to a channel estimation method, device, equipment and storage medium.

Background Art

In a radio frequency division multiplexing (RFDM) wireless communication system, in order to equalize and detect the demodulated signal at the receiver, it is necessary to estimate the complex channel through which the signal passes and obtain all the channel state information. The detection performance of the receiver directly depends on the accuracy of the channel estimation. How to implement accurate and feasible channel estimation is an urgent problem to be solved in a radio frequency division multiplexing (RFDM) wireless communication system.

Summary of the invention

The technical problem to be solved by the present invention is to provide a channel estimation method, device, equipment and storage medium to improve the accuracy of channel estimation.

In order to solve the above technical problem, the present invention provides a channel estimation method, comprising:

Extract all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extract the column coordinates corresponding to all possible non-zero values in the rows corresponding to the all row coordinates, generate protection coordinates, and generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates;

Sending the signal sending sequence to a receiving end so that the receiving end parses the signal sending sequence to obtain a signal receiving sequence;

The pilot symbols in the acquired signal reception sequence are screened according to a preset threshold value, and the screened pilot symbols are mapped to obtain channel estimation information.

In a possible implementation manner, a signal transmission sequence of a transmitting end is generated according to preset pilot coordinates and the protection coordinates, specifically:

Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate;

The protection coordinates are correspondingly set in the signal sending sequence, and a first protection symbol is set at the protection coordinates to generate a first signal sending sequence.

In a possible implementation manner, a signal transmission sequence of a transmitting end is generated according to preset pilot coordinates and the protection coordinates, specifically:

Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate;

The protection coordinates are correspondingly set in the signal transmission sequence, and a first protection symbol is set at the protection coordinates;

Obtain blank coordinates in the signal transmission sequence excluding the pilot coordinates and the protection coordinates, and set a second pilot symbol and a second protection symbol at the blank coordinates to generate a first signal transmission sequence.

In a possible implementation manner, the pilot symbols in the acquired signal reception sequence are screened according to a preset threshold value, specifically:

The pilot symbol energy of each pilot symbol obtained is calculated, and all pilot symbol energies are compared with the set threshold value to determine whether the pilot symbol energy is greater than the threshold value. If so, the pilot symbol is retained, otherwise, the pilot symbol is removed.

In a possible implementation manner, the receiving end parses the signal sending sequence to obtain a signal receiving sequence, specifically:

Acquire the column coordinates of each pilot in the signal transmission sequence, extract the column information of the corresponding column in the equivalent channel matrix based on the column coordinates, and generate a group of pilot signals;

Acquire the number of the pilot signals in the signal transmission sequence, and, based on the number of the pilot signals, set a corresponding number of groups of pilot signals in the signal reception sequence;

Each group of pilot signals is correspondingly set at the position of each pilot signal in the signal sending sequence to obtain a signal receiving sequence.

The present invention also provides a channel estimation device, comprising: a signal transmission sequence generation module, a signal transmission sequence analysis module and a channel estimation module;

The signal transmission sequence generation module is used to extract all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extract the column coordinates corresponding to all possible non-zero values in the rows corresponding to all the row coordinates, generate protection coordinates, and generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates;

The signal transmission sequence parsing module is used to send the signal transmission sequence to a receiving end, so that the receiving end parses the signal transmission sequence to obtain a signal reception sequence;

The channel estimation module screens the pilot symbols in the acquired signal reception sequence according to a preset threshold value, and performs mapping processing on the screened pilot symbols to obtain channel estimation information.

In a possible implementation manner, the signal transmission sequence generation module is used to generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates, specifically:

Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate;

The protection coordinates are correspondingly set in the signal sending sequence, and a first protection symbol is set at the protection coordinates to generate a first signal sending sequence.

In a possible implementation manner, the signal transmission sequence generation module is used to generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates, specifically:

The preset pilot coordinates and the protection coordinates generate a signal transmission sequence of the transmitting end, specifically:

Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate;

The protection coordinates are correspondingly set in the signal transmission sequence, and a first protection symbol is set at the protection coordinates;

Obtain blank coordinates in the signal transmission sequence excluding the pilot coordinates and the protection coordinates, and set a second pilot symbol and a second protection symbol at the blank coordinates to generate a first signal transmission sequence.

In a possible implementation manner, the channel estimation module is used to filter the pilot symbols in the acquired signal reception sequence according to a preset threshold value, specifically:

The pilot symbol energy of each pilot symbol obtained is calculated, and all pilot symbol energies are compared with the set threshold value to determine whether the pilot symbol energy is greater than the threshold value. If so, the pilot symbol is retained, otherwise, the pilot symbol is removed.

In a possible implementation manner, the signal transmission sequence parsing module is used to enable the receiving end to parse the signal transmission sequence to obtain a signal reception sequence, specifically:

Acquire the column coordinates of each pilot in the signal transmission sequence, extract the column information of the corresponding column in the equivalent channel matrix based on the column coordinates, and generate a group of pilot signals;

Acquire the number of the pilot signals in the signal transmission sequence, and, based on the number of the pilot signals, set a corresponding number of groups of pilot signals in the signal reception sequence;

Each group of pilot signals is correspondingly set at the position of each pilot signal in the signal sending sequence to obtain a signal receiving sequence.

The present invention also provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the channel estimation method as described in any one of the above when executing the computer program.

The present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the channel estimation methods described above.

The channel estimation method, device, equipment and storage medium of the embodiment of the present invention have the following beneficial effects compared with the prior art:

Based on the cyclic characteristics of the equivalent channel matrix, by extracting all the row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extracting the column coordinates corresponding to all possible non-zero values in the rows corresponding to the said all the row coordinates, the protection coordinates are generated, and the signal transmission sequence of the transmitting end is generated according to the preset pilot coordinates and the said protection coordinates, so as to realize the reasonable arrangement of the pilot position and the protection symbol position in the signal transmission sequence, so that the pilot is free from the interference of other symbols, and the said signal transmission sequence is parsed by the receiving end to obtain the signal receiving sequence, and the pilot symbols in the said signal receiving sequence are screened according to the preset threshold value, and the screened pilot symbols are mapped to obtain channel estimation information. Based on the cyclic characteristics of the equivalent channel matrix, the present invention reasonably sets the pilot and protection symbols in the signal transmission sequence, and maps the pilot symbols screened by the preset threshold value at the receiving end to improve the accuracy of channel estimation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic flow chart of an embodiment of a channel estimation method provided by the present invention;

FIG2 is a schematic structural diagram of an embodiment of a channel estimation device provided by the present invention;

FIG3 is a schematic diagram of an equivalent channel matrix according to an embodiment of the present invention;

FIG4 is a schematic diagram of a pilot signal transmission sequence according to an embodiment of the present invention;

FIG5 is a schematic diagram of two pilot signal connections according to an embodiment of the present invention;

6 is a schematic diagram of a mapping table when a pilot signal is placed at position 0 of a signal transmission sequence according to an embodiment of the present invention;

FIG7 is a schematic diagram of a signal transmission sequence of two pilot signals according to an embodiment of the present invention;

8 is a schematic diagram of signal transmission and reception of a multiple-input multiple-output RFDM system according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of single-antenna multi-user uplink/downlink signal communication according to an embodiment of the present invention.

DETAILED DESCRIPTION

The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Example 1

Referring to FIG. 1 , FIG. 1 is a flow chart of an embodiment of a channel estimation method provided by the present invention. As shown in FIG. 1 , the method includes steps 101 to 103, which are specifically as follows:

Step 101: extract all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extract the column coordinates corresponding to all possible non-zero values in the rows corresponding to the said all row coordinates, generate protection coordinates, and generate a signal sending sequence of the transmitting end according to the preset pilot coordinates and the said protection coordinates.

In one embodiment, in the affine Fourier transform communication system, the signal transmission sequence x and the signal reception sequence y in the discrete affine Fourier transform domain of the transmitting end and the receiving end satisfy the following relationship:

为接收端DAFT域的噪声，服从零均值，方差为N₀的高斯分布，P≥1是多径数目,q＝(p+loc_i)_N，loc_i＝α_i+2Nc₁l_i，α_i∈(-α_max,α_max)是第i条分径为子载波间隔所归一化的整数多普勒频移，l_i是第i条分径为抽样间隔所归一化的时延，α_max是最大多普勒频移，

c₂为任意无理数或远小于

的有理数。Where, N is the number of symbols,

is the noise in the DAFT domain at the receiving end, which obeys a Gaussian distribution with zero mean and variance _N0 , P≥1 is the number of multipaths, q＝(p+loc _i ) _N , loc _i ＝α _i +2Nc ₁ l _i , α _i ∈(-α _max ,α _max ) is the integer Doppler shift of the ith path normalized by the subcarrier spacing, l _i is the delay of the ith path normalized by the sampling spacing, α _max is the maximum Doppler shift,

c ₂ is any irrational number or much smaller than

Rational number.

In one embodiment, the relationship between the above signal transmission sequence x and the signal reception sequence y is converted into a matrix form as shown below:

H是信道矩阵形式的表达，

为DAFT域的噪声向量。Among them, the equivalent channel matrix

H is the channel matrix expression,

is the noise vector in DAFT domain.

In one embodiment, in a radio frequency division multiplexing communication system, each row and each column in the equivalent channel matrix has Q+1 possible non-zero values, and since the coordinates of the possible non-zero values in the equivalent channel matrix show cyclic characteristics in both the row direction and the column direction, it indicates that each row and each column in the equivalent channel matrix contains all the channel state information, wherein the schematic diagram of the equivalent channel matrix is shown in FIG3. Therefore, in this embodiment, based on the cyclic characteristics of the equivalent channel matrix, all row coordinates of the rows where all possible non-zero values in the first column of the equivalent channel matrix are located are extracted, wherein all possible non-zero values in the first column of the equivalent channel matrix are determined by the maximum Doppler frequency shift α _max , the number of symbol points N of a single column and the parameter Q. As shown in FIG3 , all possible non-zero values in the first column of the equivalent channel matrix are (0, α _max ) ∪ (N-Q+α _max , N-1).

l_max是由采样周期归一化后的最大时延；In one embodiment, the parameter

l _max is the maximum delay normalized by the sampling period;

In one embodiment, after extracting all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, all row coordinates corresponding to all the extracted rows are extracted again to extract all possible non-zero values in the row coordinates corresponding to all the above rows, and the column coordinates corresponding to all possible non-zero values in the row coordinates are set as protection coordinates.

In one embodiment, the number of symbols of a signal transmission sequence is obtained, wherein each symbol number corresponds to a coordinate; the zeroth coordinate of the signal transmission sequence is set as a pilot coordinate, and a first pilot is set at the pilot coordinate, and the protection coordinate is correspondingly set in the signal transmission sequence, and a first protection symbol is set at the protection coordinate to generate a first signal transmission sequence, and based on the set first protection symbol, a subsequent receiving end can be protected from interference from other symbols when receiving the pilot; wherein a schematic diagram of a signal transmission sequence of a pilot is shown in FIG4 , in which P is a pilot and 0 is a protection symbol.

Step 102: Send the signal sending sequence to a receiving end, so that the receiving end parses the signal sending sequence to obtain a signal receiving sequence.

In one embodiment, the number of pilots and the number of symbol points N satisfy the following relationship:

N _P (2l _max α _max +2α _max +l _max +1)≤N;

Wherein, _Np is the number of pilots, N is the number of symbol points, _αmax is the maximum Doppler frequency shift, and _lmax is the maximum delay.

In one embodiment, the column coordinates of each pilot in the signal sending sequence are obtained, and the column information of the corresponding column in the equivalent channel matrix is extracted based on the column coordinates to generate a group of pilot signals; specifically, if the position of the first pilot in the signal sending sequence is at the zeroth position of the signal sending sequence, the column information of the zeroth column in the equivalent channel matrix is correspondingly extracted to generate a group of pilot signals corresponding to the pilot.

In one embodiment, if there are two first pilots in the signal transmission sequence, column information corresponding to two columns in the equivalent channel matrix is extracted, and a group of pilot signals corresponding to the two first pilots are generated respectively.

In one embodiment, the number of pilots in the signal transmission sequence is obtained, and based on the number of pilots, a corresponding number of groups of pilot signals are set in the signal reception sequence. Specifically, after receiving the signal transmission sequence, the receiving end traverses the signal transmission sequence to obtain the number of pilots in the signal transmission sequence. If the number of pilots in the signal transmission sequence is one, the receiving end sets a group of pilot signals in the signal reception sequence, wherein a group of pilot signals is Q+1; if the number of pilots in the signal transmission sequence is two, the receiving end sets 2Q+2 pilot signals in the signal reception sequence, and so on. And if there are two first pilots in the signal transmission sequence, the column information corresponding to the two columns in the equivalent channel matrix is extracted, and a group of pilot signals corresponding to the two first pilots are generated respectively.

In one embodiment, when the receiving end traverses the signal sending sequence and obtains the pilot in the signal sending sequence, it also needs to obtain the position of the pilot in the signal sending sequence, and based on the position of each pilot in the signal sending sequence, each group of pilot signals is set at the position of each pilot to obtain a signal receiving sequence.

In one embodiment, since the number of symbol points constituting the signal transmission sequence is the same as the number of symbol points constituting the channel reception sequence, when the receiving end converts the pilot in the pilot signal transmission sequence into Q+1 pilot symbols in the signal reception sequence, the symbols on both sides of the pilot position are occupied and converted into pilot symbols; FIG5 is a schematic diagram of the signal transmission and reception sequence of two pilots; when the number of pilots in the signal transmission sequence is 2, a schematic diagram of the signal transmission sequence of two pilots is shown in FIG5(a), and a schematic diagram of the signal reception sequence of two pilots generated by the receiving end is shown in FIG5(b), in which Δ is the received pilot symbol.

Step 103: filter the pilot symbols in the acquired signal reception sequence according to a preset threshold value, and perform mapping processing on the filtered pilot symbols to obtain channel estimation information.

In one embodiment, a threshold value ζ normalized by the noise variance N ₀ is introduced to determine whether a certain path exists in the channel; specifically, the pilot symbol energy of each pilot symbol obtained is calculated, wherein the pilot symbol energy is the square of the absolute value of the pilot symbol, and all pilot symbol energies are compared with the set threshold value to determine whether the pilot symbol energy is greater than the threshold value. If so, it is considered that a path exists and the pilot symbol is retained. If not, it is considered that no path exists and the pilot symbol is removed.

In one embodiment, since the threshold value has a great influence on the accuracy of channel estimation, if the threshold value is set too high, some weak paths will not be estimated; if the threshold value is set too large, some paths that do not actually exist will be misjudged as existing. Both of these situations will reduce the accuracy of channel estimation, thereby causing subsequent detection performance to deteriorate. Therefore, in this embodiment, the value of the threshold value is determined by the channel, and in actual use, it needs to be dynamically adjusted according to the communication performance results to adapt to the changing channel. Specifically, as the pilot symbol energy increases, a larger threshold value is used to reduce the probability of misjudgment; as the pilot symbol energy decreases, a smaller threshold value is used to reduce the probability of missed judgment.

In one embodiment, each retained pilot symbol is mapped through a preset mapping table, wherein the preset mapping table provides a conversion relationship between the channel expression in the DAFT domain and the delay-Doppler domain. Based on the mapping process, the delay-Doppler characteristics of the channel are obtained, and channel estimation is completed based on the delay-Doppler characteristics of the channel.

As an example of this embodiment, a pilot is placed at the 0th position in the signal transmission sequence. The position m of the received pilot symbol corresponding to the pilot and the relationship between the corresponding complex gain h _i , Doppler frequency shift α _i and path delay _li are as shown in FIG6 , where FIG6 is a schematic diagram of a mapping table when the pilot is placed at the 0th position in the signal transmission sequence.

In one embodiment, based on the relationship between the signal transmission sequence x and the signal reception sequence y in the discrete affine Fourier transform domain of the transmitting end and the receiving end mentioned in step 101, when the pilot is placed at other positions in the signal transmission sequence, the preset mapping table is adaptively modified to obtain a mapping table corresponding to each pilot.

As an example of this embodiment, a channel estimation method provided by this embodiment can be applied to a multi-antenna scenario, that is, a multi-input multi-output scenario; at the transmitting end of the multi-antenna scenario, for each transmitting antenna in the transmitting end, according to the signal transmission sequence generation method in the above step 101, the pilot symbol is placed at a specific position and surrounded by an appropriate number of protection symbols, and the data symbol is placed at the blank coordinates of the signal transmission sequence, wherein the pilot symbol placement position in each transmitting antenna is different; and at the receiving end, for each receiving antenna, according to the number of transmitting antennas in the transmitting end, a channel is estimated according to the corresponding number of groups of receiving pilot symbols, as shown in FIG8 , FIG8 is a signal transmission and reception schematic diagram of a 3x3 multi-input multi-output pseudo-RFDM system, FIG8 (a) (b) (c) shows the transmission schematic diagram of three transmitting antennas, and FIG8 (d) shows the reception schematic diagram of one receiving antenna. And for any transmitting end, the number of transmitting antennas _Nt >1, the specific _symbol arrangement scheme of the pseudo-RFDM system of the majority input multi-output is shown in the following formula:

为发送符号，

表示第n_t个发送天线的数据符号，x_p为导频符号。in,

To send a symbol,

represents the data symbol of the _nth transmitting antenna, and _xp is the pilot symbol.

The number of symbols O _AFDM required for channel estimation in an N _t × N _r multiple-input multiple-output system is calculated as follows:

O _AFDM = (N _t +1)Q + N _t =2N _t l _max α _max +2l _max α _max +2N _t α _max +N _t l _max +2α _max +l _max +N _t .

As an example of this embodiment, a channel estimation method provided by this embodiment can also be applied to a multi-user scenario, such as in a single-antenna multi-user uplink scenario, the pilot coordinate arrangement of different users is the same as the above-mentioned setting in the multi-antenna scenario, each user occupies a part of the remaining blank coordinates to place its own data symbol, and each part is separated by a protection symbol to avoid interference between users; in a single-antenna multi-user uplink and downlink scenario, only one pilot is needed at the transmitting antenna of the base station transmitting end during downlink transmission, because all users can use the receiving pilot symbol corresponding to the pilot for channel estimation, and the downlink scenario is similar to the uplink scenario, and protection symbols are needed to separate the data transmitted to different users to avoid interference between users. As shown in Figure 9, Figure 9 is a schematic diagram of single-antenna multi-user uplink\downlink signal communication, Figure 9 (a) (b) (c) shows a schematic diagram of three users of a single antenna communicating with a base station for uplink, and Figure 9 (d) shows a schematic diagram of a single-antenna base station communicating with three users for downlink.

Example 2

With respect to Embodiment 1, the difference in this embodiment is that in step 101: the manner of generating the signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates is different.

In this embodiment, the zeroth coordinate of the signal sending sequence is set as the pilot coordinate, and the first pilot is set at the pilot coordinate; the protection coordinate is correspondingly set in the signal sending sequence, and the first protection symbol is set at the protection coordinate; the blank coordinates excluding the pilot coordinates and the protection coordinates in the signal sending sequence are obtained, and the second pilot and the second protection symbol are set at the blank coordinates to generate a first signal sending sequence, wherein a schematic diagram of the signal sending sequence of two pilots is shown in Figure 7, in which p is the pilot and 0 is the protection symbol.

In one embodiment, the number of second pilots set at blank coordinates may be one or more, and for each second pilot set at the blank coordinates, Q protection symbols are set at the blank coordinates on both sides of the second pilot, and each second pilot is spaced by the protection symbols to avoid interference between signals.

In this embodiment, since the accuracy of the channel estimation performance will be reduced under high noise conditions, additional second pilot symbols are placed at the remaining blank coordinates except the pilot coordinates and the first protection coordinates to perform multiple channel estimates, so as to weaken the impact of noise on the accuracy of channel estimation, which can improve the accuracy of subsequent channel estimation.

In summary, a channel estimation method provided by Example 1 and Example 2 is based on the cyclic characteristics of the equivalent channel matrix. By obtaining the possible non-zero values in the first column of the equivalent channel matrix, the pilot and protection symbol positions in the signal sending sequence of the transmitter are rationally set, so that the pilot symbols received by the receiving end are free from interference from other symbols. At the same time, after receiving the pilot symbols, the receiving end screens the pilot symbols according to the threshold value to improve the subsequent detection performance, and the screened pilot symbols are mapped to complete the channel estimation, thereby improving the accuracy of channel estimation while improving the efficiency of channel estimation.

Example 3

Referring to FIG. 2 , FIG. 2 is a schematic diagram of the structure of an embodiment of a channel estimation device provided by the present invention. As shown in FIG. 2 , the device includes a signal transmission sequence generation module 201, a signal transmission sequence analysis module 202 and a channel estimation module 203, which are specifically as follows:

The signal sending sequence generation module 201 is used to extract all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extract the column coordinates corresponding to all possible non-zero values in the rows corresponding to all the row coordinates, generate protection coordinates, and generate a signal sending sequence for the transmitting end according to the preset pilot coordinates and the protection coordinates.

The signal transmission sequence parsing module 202 is used to send the signal transmission sequence to the receiving end, so that the receiving end parses the signal transmission sequence to obtain a signal reception sequence.

The channel estimation module 203 is used to screen the pilot symbols in the acquired signal reception sequence according to a preset threshold value, and perform mapping processing on the screened pilot symbols to obtain channel estimation information.

In one embodiment, the signal sending sequence generation module 201 is used to construct a signal sending sequence of the transmitting end according to the pilot coordinates and the protection coordinates. Specifically, the zeroth coordinate of the signal sending sequence is set as the pilot coordinate, and the first pilot is set at the pilot coordinate; the protection coordinate is set correspondingly in the signal sending sequence, and the first protection symbol is set at the protection coordinate to generate a first signal sending sequence.

In one embodiment, the channel estimation module 203 is used to screen the pilot symbols in the obtained signal receiving sequence according to a preset threshold value. Specifically, the pilot symbol energy of each obtained pilot symbol is calculated, and all pilot symbol energies are compared with the set threshold value respectively to determine whether the pilot symbol energy is greater than the threshold value. If so, the pilot symbol is retained, if not, the pilot symbol is discarded.

In one embodiment, the signal sending sequence parsing module 202 is used to obtain the column coordinates of each pilot in the signal sending sequence, extract the column information of the corresponding column in the equivalent channel matrix based on the column coordinates, and generate a group of pilot signals; obtain the number of the pilots in the signal sending sequence, and set a corresponding number of groups of pilot signals in the signal receiving sequence based on the number of pilots; and set each group of pilot signals at the position of each pilot in the signal sending sequence to obtain a signal receiving sequence.

Example 4

For Embodiment 3, the difference in this embodiment is that in the signal transmission sequence generation module 201, the signal transmission sequence generation module 201 is used to construct the signal transmission sequence of the transmitting end in a different manner according to the preset pilot coordinates and the protection coordinates.

The signal sending sequence generation module 201 is used to generate a signal sending sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates. Specifically, the zeroth coordinate of the signal sending sequence is set as the pilot coordinate, and the first pilot is set at the pilot coordinate; the protection coordinate is set in the signal sending sequence accordingly, and the first protection symbol is set at the protection coordinate; the blank coordinates other than the pilot coordinates and the protection coordinates are obtained in the signal sending sequence, and the second pilot and the second protection symbol are set at the blank coordinates to generate a first signal sending sequence.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

It should be noted that the above-mentioned embodiments of the channel estimation device are merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

Based on the above-mentioned embodiment of the channel estimation method, another embodiment of the present invention provides a channel estimation terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the channel estimation method of any embodiment of the present invention is implemented.

Exemplarily, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program in the channel estimation terminal device.

The channel estimation terminal device may be a computing device such as a desktop computer, a notebook, a palm computer, a cloud server, etc. The channel estimation terminal device may include, but is not limited to, a processor and a memory.

The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the channel estimation terminal device, and uses various interfaces and lines to connect various parts of the entire channel estimation terminal device.

The memory can be used to store the computer program and/or module, and the processor realizes various functions of the channel estimation terminal device by running or executing the computer program and/or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

Based on the above-mentioned embodiment of the channel estimation method, another embodiment of the present invention provides a storage medium, wherein the storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the channel estimation method of any embodiment of the present invention.

In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

In summary, the present invention provides a channel estimation method, apparatus, device and storage medium, which generates protection coordinates by extracting all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extracting the column coordinates corresponding to all possible non-zero values in the rows corresponding to the said all row coordinates, and generating a signal transmission sequence of the transmitting end according to the pilot coordinates and the protection coordinates; the signal transmission sequence is sent to the receiving end so that the receiving end parses the signal transmission sequence to obtain a signal receiving sequence; the pilot symbols in the obtained signal receiving sequence are screened according to a preset threshold value, and the screened pilot symbols are mapped to obtain channel estimation information. The technical solution of the present invention is based on the cyclic characteristics of the equivalent channel matrix, reasonably sets the pilot and protection symbols in the signal transmission sequence, and maps the pilot symbols screened by the preset threshold value at the receiving end to improve the accuracy of channel estimation.

The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims (10)

1. A channel estimation method, comprising: Extract all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extract the column coordinates corresponding to all possible non-zero values in the rows corresponding to the all row coordinates, generate protection coordinates, and generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates; Sending the signal sending sequence to a receiving end so that the receiving end parses the signal sending sequence to obtain a signal receiving sequence; The pilot symbols in the acquired signal reception sequence are screened according to a preset threshold value, and the screened pilot symbols are mapped to obtain channel estimation information. 2. A channel estimation method according to claim 1, characterized in that, according to the preset pilot coordinates and the protection coordinates, a signal transmission sequence of the transmitting end is generated, specifically: Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate; The protection coordinates are correspondingly set in the signal sending sequence, and a first protection symbol is set at the protection coordinates to generate a first signal sending sequence. 3. A channel estimation method according to claim 1, characterized in that, according to the preset pilot coordinates and the protection coordinates, a signal transmission sequence of the transmitting end is generated, specifically: Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate; The protection coordinates are correspondingly set in the signal transmission sequence, and a first protection symbol is set at the protection coordinates; Obtain blank coordinates in the signal transmission sequence excluding the pilot coordinates and the protection coordinates, and set a second pilot symbol and a second protection symbol at the blank coordinates to generate a first signal transmission sequence. 4. A channel estimation method according to claim 1, characterized in that the pilot symbols in the obtained signal reception sequence are screened according to a preset threshold value, specifically: The pilot symbol energy of each pilot symbol obtained is calculated, and all pilot symbol energies are compared with the set threshold value to determine whether the pilot symbol energy is greater than the threshold value. If so, the pilot symbol is retained, otherwise, the pilot symbol is removed. 5. A channel estimation method according to claim 1, characterized in that the receiving end parses the signal sending sequence to obtain the signal receiving sequence, specifically: Acquire the column coordinates of each pilot in the signal transmission sequence, extract the column information of the corresponding column in the equivalent channel matrix based on the column coordinates, and generate a group of pilot signals; Acquire the number of the pilot signals in the signal transmission sequence, and, based on the number of the pilot signals, set a corresponding number of groups of pilot signals in the signal reception sequence; Each group of pilot signals is correspondingly set at the position of each pilot signal in the signal sending sequence to obtain a signal receiving sequence. 6. A channel estimation device, characterized in that it comprises: a signal transmission sequence generation module, a signal transmission sequence analysis module and a channel estimation module; The signal transmission sequence generation module is used to extract all row coordinates of the rows where all possible non-zero values are located in the first column of the equivalent channel matrix, and extract the column coordinates corresponding to all possible non-zero values in the rows corresponding to all the row coordinates, generate protection coordinates, and generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates; The signal transmission sequence parsing module is used to send the signal transmission sequence to a receiving end, so that the receiving end parses the signal transmission sequence to obtain a signal reception sequence; The channel estimation module screens the pilot symbols in the acquired signal reception sequence according to a preset threshold value, and performs mapping processing on the screened pilot symbols to obtain channel estimation information. 7. A channel estimation device according to claim 6, characterized in that the signal transmission sequence generation module is used to generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates, specifically: Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate; The protection coordinates are correspondingly set in the signal sending sequence, and a first protection symbol is set at the protection coordinates to generate a first signal sending sequence. 8. A channel estimation device according to claim 6, characterized in that the signal transmission sequence generation module is used to generate a signal transmission sequence of the transmitting end according to the preset pilot coordinates and the protection coordinates, specifically: Setting the zeroth coordinate of the signal transmission sequence as a pilot coordinate, and setting a first pilot at the pilot coordinate; The protection coordinates are correspondingly set in the signal transmission sequence, and a first protection symbol is set at the protection coordinates; Obtain blank coordinates in the signal transmission sequence excluding the pilot coordinates and the protection coordinates, and set a second pilot symbol and a second protection symbol at the blank coordinates to generate a first signal transmission sequence. 9. A terminal device, characterized in that it comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements the channel estimation method according to any one of claims 1 to 5. 10. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the channel estimation method according to any one of claims 1 to 5.

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