CN106656893B

CN106656893B - STBC (space time block coding) sending method, receiving method, transmitting end and receiving end

Info

Publication number: CN106656893B
Application number: CN201510725400.3A
Authority: CN
Inventors: 屈代明; 王芳; 江涛; 闵雷
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-10-30
Filing date: 2015-10-30
Publication date: 2020-07-07
Anticipated expiration: 2035-10-30
Also published as: WO2017071342A1; CN106656893A

Abstract

A transmitting method of STBC coding includes generating first, second, third and fourth STBC code blocks by a transmitting end, generating first, second, third and fourth FBMC signals according to the first, second, third and fourth STBC code blocks respectively, carrying out trailing truncation operation on the first and third FBMC signals respectively and carrying out leading trailing truncation operation on the second and fourth FBMC signals respectively, overlapping and adding trailing of the first FBMC signal and leading trailing of the second FBMC signal and mapping on a first antenna, overlapping and adding trailing of the third FBMC signal and leading trailing of the fourth FBMC signal and mapping on a second antenna, carrying out trailing truncation and trailing superposition on a trailing signal generated by the STBC code block to reduce time domain overhead caused by protection interval.

Description

STBC (space time block coding) sending method, receiving method, transmitting end and receiving end

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a transmission method, a reception method, a transmitting end, and a receiving end for STBC coding.

Background

The Filter Bank Multi-carrier (FBMC) is a Multi-carrier modulation technique, and compared with Orthogonal Frequency Division Multiplexing (OFDM), FBMC has lower out-of-band radiation and higher spectral efficiency, and has a good application prospect. A typical implementation of FBMC is to use Orthogonal Frequency Division Multiplexing (OFDM)/Offset Quadrature Amplitude Modulation (OQAM) technology. This name is called because its implementation has strong similarity to OFDM. However, unlike OFDM/OQAM, which transmits pure real or pure imaginary OQAM symbols, the OFDM/OQAM uses the real-domain orthogonality of the prototype filter to achieve orthogonality of the transmitted signals in the frequency domain and the time domain. In addition, due to the good time-frequency local characteristic of the prototype filter, the OFDM/OQAM can achieve better transmission performance in a fading channel on the premise of not adding a Cyclic Prefix (CP), and compared with the OFDM, the throughput of the system is improved. In addition, OFDM/OQAM is also called FBMC/OQAM in some documents. In this context, FBMC, OFDM/OQAM and FBMC/OQAM represent the same meaning.

The multi-antenna transmission diversity technology can effectively resist channel fading and improve the reliability of a communication system. The Alamouti coding is a classic space-time coding scheme based on the transmit diversity, can effectively resist channel fading, and improves the reliability of a communication system. However, the FBMC has the problem that the time-frequency data block is long in time-domain tailing, which often causes huge time-domain overhead, so that the FBMC is difficult to be combined with Alamouti coding.

The prior art proposes a Block-Time Block Code (STBC) scheme, which is a mainstream idea of combining FBMC and Alamouti. The coding scheme of this scheme is shown in fig. 1. As shown in FIG. 1, c_ijAnd e_ijPure real or pure imaginary numbers, which represent the conjugate of a complex number. The time-frequency region marked with 0 is a guard interval, and effective data cannot be sent in the region and is used for mutual interference between adjacent data blocks. The length of the guard interval is determined by the length of the prototype filter tail. In the following description, each column of data in the data block in the above figure is referred to as an FBMC symbol, hereinafter referred to as a symbol. Although the space-time coding scheme of the data block enables the data obtained by the receiving end to have the characteristics of the Alamouti code, the guard interval between the data blocks causes a great time-frequency overhead.

Disclosure of Invention

The embodiment of the invention provides a sending method, a receiving method, a transmitting end and a receiving end of STBC (space time block coding), and time domain cost caused by a guard interval can be reduced by carrying out trailing truncation and trailing superposition on a trailing signal generated by an STBC code block.

A first aspect of an embodiment of the present invention provides a method for transmitting STBC codes, including:

the method comprises the steps that a transmitting end generates a first STBC code block, a second STBC code block, a third STBC code block and a fourth STBC code block, a first FBMC signal, a second FBMC signal, a third FBMC signal and a fourth FBMC signal are generated according to the first STBC code block, the second STBC code block, the third STBC code block and the fourth STBC code block respectively, the FBMC signals comprise tails, rear tail truncation operation is conducted on the first FBMC signal and the third FBMC signal respectively, front tail truncation operation is conducted on the second FBMC signal and the fourth FBMC signal respectively, the rear tails of the first FBMC signal and the front tails of the second FBMC signal are overlapped and added and mapped on a first antenna, and the rear tails of the third FBMC signal and the front tails of the fourth FBMC signal are overlapped and added and mapped on a second antenna.

In the technical scheme, the transmitting end carries out tailing truncation and tailing superposition on a tailing signal generated by the STBC code block, so that time domain overhead caused by a guard interval can be reduced.

In a first possible implementation manner of the first aspect, the transmitting end may generate first, second, third and fourth window functions for performing tail truncation on the first, second, third and fourth FBMC signals, respectively, and perform tail truncation on the first, second, third and fourth FBMC signals through the first, second, third and fourth window functions, respectively.

In the technical scheme, the FBMC signal is subjected to truncation operation through the window function, so that the implementation complexity is low and the operation is easy.

In a second possible implementation manner of the first aspect, the transmitting end may perform trailing-tail truncation on the first and third FBMC signals to obtain first and third trailing signals, perform leading-tail truncation on the second and fourth FBMC signals to obtain second and fourth trailing signals, process the first, second, third and fourth trailing signals through an analysis filter bank to obtain first, second, third and fourth frequency-domain trailing cancellation signals, respectively construct first, second, third and fourth trailing cancellation signals through the first, second, third and fourth frequency-domain trailing cancellation signals, and subtract the first, second, third and fourth trailing cancellation signals from the first, second, third and fourth FBMC signals to obtain first, second, third and fourth FBMC signals after trailing cancellation.

In the technical scheme, a window function for truncation is reasonably designed according to ICI and ISI which can be borne by a system, and a tail shortending mode is adopted, so that a better truncation effect can be obtained under the condition of smaller ICI/ISI.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner, after subtracting the first, second, third, and fourth tail cancellation signals from the first, second, third, and fourth FBMC signals, respectively, by the transmitting end to obtain the first, second, third, and fourth FBMC signals after tail cancellation, the tail truncation operation may be further performed on the first, second, third, and fourth FBMC signals after tail cancellation.

In the technical scheme, the tail truncation operation is carried out on the FBMC signal with the tail offset by the transmitting end, so that the tail signal can be removed more thoroughly.

With reference to any one of the second or third possible implementation manners of the first aspect, in a fourth possible implementation manner, after subtracting the first, second, third, and fourth tail cancellation signals from the first, second, third, and fourth FBMC signals to obtain first, second, third, and fourth FBMC signals after tail cancellation, the transmitting end may further determine whether tail amplitudes or powers of the first, second, third, and fourth FBMC signals after tail cancellation reach a preset threshold, if so, return to perform the step of performing tail-back clipping on the first, third, and fourth FBMC signals to obtain first and third tail signals, and perform tail-front clipping on the second, and fourth FBMC signals to obtain second and fourth tail signals, where, when performing the return to the execution step, the first, second, third, and fourth FBMC signals are the first, second, third, and fourth tail signals after tail cancellation, Second, third, and fourth FBMC signals.

With reference to the first aspect or any one of the first to the fourth possible implementation manners of the first aspect, in a fifth possible implementation manner, a length of overlap-add of a trailing edge of the first FBMC signal and a leading edge of the second FBMC signal is equal to a length of the trailing edge of the first FBMC signal or the leading edge of the second FBMC signal, and lengths of the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal are equal; or, the total length of the signals after the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal are overlapped and added is equal to integral multiple of the FBMC symbol length;

the sum of the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal is equal to the trailing edge of the third FBMC signal or the leading edge of the fourth FBMC signal, and the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal are equal in length; or, the total length of the signal after the overlap-add of the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal is equal to an integer number of FBMC symbol lengths.

With reference to the first aspect or any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner, a transmitting end may obtain an STBC code block to be transmitted, where the STBC code block to be transmitted is a signal to be transmitted on a subcarrier by a transmitting antenna, and generate the first, second, third, and fourth STBC code blocks according to the STBC code block to be transmitted, where the STBC code block to be transmitted includes 2M N data, and M and N are integers greater than 1.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, a transmitting end may divide the STBC code block to be transmitted into a first sub-STBC code block and a second sub-STBC code block, where the first STBC code block is the first sub-STBC code block, or is obtained by multiplying the first sub-STBC code block by-1 at a first specified position, the third STBC code block is the second sub-STBC code block, or is obtained by multiplying the second sub-STBC code block by-1 at a second specified position, the second STBC code block is obtained by arranging the third STBC code block in a column reverse order, multiplying each column by-1, and taking a complex conjugate, and the fourth STBC is obtained by arranging the first STBC code block in a column reverse order and taking a complex conjugate.

With reference to the sixth possible implementation manner of the first aspect, in an eighth possible implementation manner, a transmitting end may divide the STBC code block to be transmitted into a first sub-STBC code block and a second sub-STBC code block, where the first STBC code block is the first sub-STBC code block, or is obtained by multiplying the first sub-STBC code block by-1 at a first specified position, the third STBC code block is the second sub-STBC code block, or is obtained by multiplying the second sub-STBC code block by-1 at a second specified position, the second STBC code block is obtained by arranging the third STBC code block in a column reverse order, multiplying each column by-1, and taking a complex conjugate, and the fourth STBC is obtained by arranging the first STBC code block in a column reverse order.

In the two technical schemes, the transmitting end can solve the mutual interference between the data blocks.

With reference to the first aspect or any one of the first to eighth possible implementation manners of the first aspect, in a ninth possible implementation manner, the transmitting end may map the first STBC code block onto consecutive N symbols on consecutive M subcarriers of a first antenna, process the first FBMC signal through a preset processing manner, map the second STBC code block onto consecutive N symbols on consecutive M subcarriers, adjacent to the first STBC code block in time domain, of the first antenna and having the same frequency domain position, process the second FBMC signal through the preset processing manner, map the third STBC code block onto the same time-frequency position as the first STBC code block in a second antenna, process the third FBMC signal through the preset processing manner, map the fourth STBC code block onto the same time-frequency position as the second STBC code block in the second antenna, and the fourth FBMC signal is obtained through the preset processing mode.

The second aspect of the present invention provides a transmitting end, which includes a code block generating module, an FBMC signal generating module, a puncturing operation module, and a transmitting module, where the transmitting end implements part or all of the method of the first aspect through the above modules.

A third aspect of the present invention provides a transmitting terminal comprising a network port, a memory and a processor, wherein the memory stores a set of STBC encoded transmitting programs, and the processor is configured to call the programs stored in the memory, and the program comprises part or all of the steps of the first aspect when executed.

A fourth aspect of the present invention provides a computer storage medium storing a program which, when executed, comprises some or all of the steps of the first aspect.

A fifth aspect of the present invention provides a STBC encoded receiving method, comprising,

the method comprises the steps that a receiving end obtains an FBMC signal in a transmission time slot, the FBMC signal is processed through tailing truncation, the length of a front tailing and the length of a rear tailing are determined, a plurality of zeros which are the same as the length of the front tailing are complemented on the front end of the FBMC signal, a plurality of zeros which are the same as the length of the rear tailing are complemented on the rear end of the FBMC signal, and the FBMC signal after tailing processing is processed through Alamouti combination.

A sixth aspect of the present invention provides a receiving end, including an FBMC signal obtaining module, a tail length determining module, a first processing module, and a second processing module, where the transmitting end implements part or all of the method of the second aspect through the above modules.

A seventh aspect of the present invention provides a transmitting end comprising a network port, a memory and a processor, wherein the memory stores a set of STBC encoded receiving programs, and the processor is configured to call the programs stored in the memory, and the program comprises some or all of the steps of the fifth aspect when executed.

An eighth aspect of the present invention provides a computer storage medium storing a program which, when executed, includes some or all of the steps of the fifth aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of prior art multi-antenna diversity encoding;

fig. 2 is a flowchart illustrating a method for transmitting STBC codes according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a transmitter structure based on extended IFFT;

FIG. 4 is a schematic diagram of a transmitter based on a polyphase filter bank;

fig. 5 is a schematic diagram of an FBMC signal generated by a transmitter based on a polyphase filter bank;

FIG. 6 is a diagram of a window function of an FBMC original signal;

FIG. 7 is a schematic diagram of a window function of another FBMC original signal;

FIG. 8 is a schematic diagram of the windowing truncation of the FBMC original signal by the window function of FIG. 6;

FIG. 9 is a block diagram of an implementation of extended FFT-based analysis filterbank operation;

FIG. 10 is a block diagram of an implementation of an analysis filter bank operation based on a polyphase filter bank;

FIG. 11 is a schematic diagram of overlap-add of tail-truncated FBMC signals;

fig. 12 is a flowchart illustrating a flow of a method for receiving STBC codes according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a truncate operation block in the transmitting end provided in fig. 13;

fig. 15 is another schematic diagram of the truncate operation block in the transmitting terminal provided in fig. 13;

fig. 16 is a schematic diagram of a code block generation module in the transmitting end provided in fig. 13;

fig. 17 is a schematic structural diagram of another transmitting end provided in the embodiment of the present invention;

fig. 18 is a schematic structural diagram of a receiving end according to an embodiment of the present invention;

fig. 19 is a schematic structural diagram of another receiving end according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2, fig. 2 is a flow chart illustrating a method for transmitting STBC codes according to an embodiment of the present invention. The method as shown in fig. 2 may include:

in step S201, first, second, third, and fourth STBC code blocks are generated.

Alternatively, the transmitting end may generate the first, second, third and fourth STBC code blocks through the following two steps.

The method comprises the following steps: the transmitting end may obtain an STBC code block to be transmitted, where the STBC code block to be transmitted is a signal to be transmitted on a subcarrier by a transmitting antenna, where the STBC code block to be transmitted includes 2 × M × N data, and M and N are integers greater than 1.

In a specific implementation, when the number of data in the STBC code block to be transmitted is less than 2 × M × N, the data may be filled with 0. For specific implementation of obtaining an STBC code block to be sent, reference may be made to the prior art, and embodiments of the present invention are not limited herein. Preferably, the STBC code blocks are all pure real numbers or the STBC code blocks are all pure imaginary numbers. In the prior art, there may be multiple modulation schemes, such that all STBC code blocks to be transmitted are pure real numbers, or all STBC code blocks to be transmitted are pure imaginary numbers, for example, an OQAM modulation scheme, etc.

Step two: and the transmitting terminal generates the first, second, third and fourth STBC code blocks according to the STBC code block to be transmitted.

In a specific implementation, one STBC block is also referred to as one data matrix, since each STBC block is described below using a matrix. In the embodiment of the present invention, the STBC code block including 2 × M × N data may be regarded as one data processing unit, and the base station generates FBMC signals of the transmitting antennas one by one according to the size of the STBC code block. There are many different embodiments for generating the STBC code block, as long as each code block symbol received by the receiving end can satisfy Alamouti characteristics, and the specific embodiment may be defined by a protocol or determined by negotiation between the transmitting end and the receiving end. Two exemplary embodiments are given here:

the first method is as follows: the transmitting end may divide the STBC code block to be transmitted into a first sub-STBC code block and a second sub-STBC code block, where the first STBC code block is the first sub-STBC code block, or is obtained by multiplying the first sub-STBC code block by-1 at a first designated position, the third STBC code block is the second sub-STBC code block, or is obtained by multiplying the second sub-STBC code block by-1 at a second designated position, the second STBC code block is obtained by arranging the third STBC code block in a reverse order of columns, multiplying each column by-1, and taking complex conjugate, and the fourth STBC block is obtained by arranging the first STBC code block in a reverse order of columns and taking complex conjugate.

In a specific implementation, it is assumed that the first sub-STBC block is a data matrix 1 and the second sub-STBC block is a data matrix 2, which respectively include a_i,jI is more than or equal to 1 and less than or equal to M, j is more than or equal to 1 and less than or equal to N and b_k,lK is more than or equal to 1 and less than or equal to M, l is more than or equal to 1 and less than or equal to N, and the method is as follows:

data matrix 1:

data matrix 2:

at this time, the transmitting end may transmit data using M total number of subcarriers on the first antenna and the second antenna, and transmit 2N total number of data on 2N symbols on each subcarrier, that is, each subcarrier transmits one data per symbol, and each antenna needs to transmit two sets of data. From data matrix 1 and data matrix 2, the base station may determine a first data matrix, a second data matrix, a third data matrix, and a fourth data matrix. Wherein the first data matrix is equal to data matrix 1 or equal to data matrix 1 multiplied by-1 at a designated position, the third data matrix is equal to data matrix 2 or equal to data matrix 2 multiplied by-1 at another designated position, the second data matrix is equal to a data matrix obtained by arranging the third data matrix in reverse order of columns, multiplying-1 at each column and taking complex conjugate, and the fourth data matrix is equal to a data matrix obtained by arranging the first data matrix in reverse order of columns and taking complex conjugate. It should be noted that the specified locations may be the same location or different locations, either as dictated by protocol or as determined by transceiver negotiation.

Optionally, as an embodiment, specifically, there are:

the first data matrix is:

the second data matrix is:

the third data matrix is:

the fourth data matrix is:

the second method comprises the following steps: the transmitting end may divide the STBC code block to be transmitted into a first sub-STBC code block and a second sub-STBC code block, where the first STBC code block is the first sub-STBC code block, or is obtained by multiplying the first sub-STBC code block by-1 at a first designated position, the third STBC code block is the second sub-STBC code block, or is obtained by multiplying the second sub-STBC code block by-1 at a second designated position, the second STBC code block is obtained by arranging the third STBC code block in a reverse order of columns, multiplying each column by-1, and taking a complex conjugate, and the fourth STBC block is obtained by arranging the first STBC code block in a reverse order of columns.

In a specific implementation, it is assumed that the first sub-STBC block is a data matrix 1 and the second sub-STBC block is a data matrix 2, which respectively include a_i,j,1≤i≤M, 1. ltoreq. j. ltoreq.N and b_k,lK is more than or equal to 1 and less than or equal to M, l is more than or equal to 1 and less than or equal to N, and the data matrix 1 and the data matrix 2 are specifically as shown above.

At this time, the base station may transmit data using M total number of subcarriers on the first antenna and the second antenna, respectively, and transmit 2N total number of data on 2N symbols per subcarrier, that is, each subcarrier transmits one data per symbol, and each antenna needs to transmit two sets of data. From data matrix 1 and data matrix 2, the base station may determine a first data matrix, a second data matrix, a third data matrix, and a fourth data matrix. Wherein the first data matrix is equal to data matrix 1 or equal to data matrix 1 multiplied by-1 at a designated position, the third data matrix is equal to data matrix 2 or equal to data matrix 2 multiplied by-1 at another designated position, the second data matrix is equal to a data matrix obtained by arranging the third data matrix in reverse order of columns and multiplying-1 at each column, and the fourth data matrix is equal to a data matrix obtained by arranging the first data matrix in reverse order of columns. It should be noted that the specified locations may be the same location or different locations, either as dictated by protocol or as determined by transceiver negotiation.

Optionally, as an embodiment, specifically, there are:

a first data matrix:

a second data matrix:

a third data matrix:

a fourth data matrix:

step S202 is to generate first, second, third, and fourth FBMC signals from the first, second, third, and fourth STBC code blocks, respectively, the FBMC signals including a tail.

Optionally, the transmitting end may map the first STBC code block on N consecutive symbols on M consecutive subcarriers of the first antenna, and process the first STBC code block in a preset processing manner to obtain the first FBMC signal, map the second STBC code block on N consecutive symbols on M consecutive subcarriers adjacent to the first STBC code block in the time domain and having the same frequency domain position in the first antenna, and process the second FBMC signal in the preset processing manner to obtain the third STBC code block, map the third STBC code block on the same time-frequency position as the first STBC code block in the second antenna, and process the third FBMC signal in the preset processing manner to obtain the fourth FBMC signal, map the fourth STBC code block on the same time-frequency position as the second STBC code block in the second antenna, and process the fourth FBMC signal in the preset processing manner to obtain the fourth FBMC signal.

The preset processing manner may adopt any prior art, and specifically refer to an extended IFFT method or a polyphase filter bank method in the prior art, as shown in fig. 3 and fig. 4.

At this time, the FBMC signal generated by each STBC block is, as shown in fig. 5, a signal with a period of smooth decline on both sides of the signal, that is, the above-mentioned tail signal, which is naturally generated in the filtering process, and the length thereof is related to the length of the filter. If the tail signal is not processed, the tail will cause a significant overhead when performing multi-antenna transmit diversity.

Step S203, respectively performing trailing truncation on the first and third FBMC signals, and respectively performing leading truncation on the second and fourth FBMC signals.

There are many alternative embodiments of the tail puncturing operation, as long as the puncturing operation can generate less Inter-Carrier Interference (ICI)/Inter-symbol Interference (ISI). Although the two data blocks are only required to be truncated after the first and third FBMC signals and truncated before the second and fourth FBMC signals when performing transmit diversity, the situation that the truncation operation is required to be performed on both the front and rear tails of each FBMC signal when performing transmit diversity on a plurality of FBMC data blocks in time domain and other reasons is not excluded. And truncating only one tail may be seen as a special case of truncating both sides, depending on the setting of the respective truncation parameter and the design of the respective truncation window function.

For the purpose of describing the truncating operation, the tail length is explained here by way of an example. Assuming that the sub-carrier spacing of the FBMC signal is F and the overlap coefficient of the prototype filter is K, N OFDM/OQAM symbols are included in the signal transmission block of one FBMC (the signal generated by the above-mentioned one STBC code block). The length of the FBMC signal will be

Wherein, of the centre

The length being the main part of the signal and each of the two sides

The signals within the time length are respectively the front tail and the back tail of the signal. For the convenience of the following description, an FBMC signal without any tail truncation operation is referred to as an original FBMC signal, and the original FBMC signal is divided into three parts: the signal body portion, the original front tail and the original back tail are located as shown in fig. 6, and the signal body portion contains the main energy in the original FBMC signal. The start time and the end time of the signal body portion correspond to the end time of the leading tail and the start time of the trailing tail, respectively.

In an alternative embodiment, the transmitting end may truncate the FBMC signal by a window function. Specifically, the transmitting end may generate a first window function, a second window function, a third window function, and a fourth window function for performing a tail truncation operation on the first FBMC signal, the second FBMC signal, the third FBMC signal, and the fourth FBMC signal, and perform the tail truncation operation on the first FBMC signal, the second FBMC signal, the third FBMC signal, and the fourth FBMC signal through the first window function, the second window function, the third window function, and the fourth window function, respectively. The length of the window function is consistent with that of the original FBMC signal, and the value of the window function is between 0 and 1. The window function is 1 in the signal body part, or in the signal body part and a part of the original front tail and the original back tail adjacent to the signal body part, the left end and the right end of the window function are 0, and the lengths of 0 intervals at the two ends can be different, depending on the specific design. The schematic diagram of the window function in the signal main part 1 and the rest 0 can be as shown in fig. 6; the graph of the window function with 1 in the signal body part and a part adjacent to the signal body part and 0 in the rest can be shown in fig. 7. The transition part is arranged between the part with the window function value of 0 and the part with the window function value of 1, and the length and the value of the transition part depend on specific requirements and designs.

In the specific implementation, the transmitting end multiplies the designed window function by the FBMC original signal correspondingly. The signal corresponding to the position with the window function value of 0 is cut off, the value of the FBMC signal corresponding to the position with the window function value of 1 is unchanged, and the signal corresponding to the position of the transition part is smoothly cut off. The window function may be illustrated in fig. 8 when the main portion of the signal is 1 and the remaining portion is 0. The effect of the truncating operation is: keeping the main body part of the original FBMC signal or the main body part and a part of the original front tail and/or the original back tail adjacent to the main body part unchanged, smoothly cutting the tail part adjacent to the main body, and directly cutting off the tail at the two extreme sides. So long as the operation that satisfies this effect can be considered an implementation of the truncating operation.

In another alternative embodiment, the transmitting end may implement the tail truncation operation by: the embodiment of the invention reasonably designs the window function for truncation according to the ICI and ISI which can be borne by the system, and can obtain better truncation effect under the condition of smaller ICI/ISI.

The method comprises the following steps: the first and third FBMC signals may be subjected to trailing clipping to obtain first and third trailing signals, respectively, and the second and fourth FBMC signals may be subjected to leading clipping to obtain second and fourth trailing signals, respectively. Specifically, assume that the original FBMC signal is s (T), T is more than or equal to 0 and less than or equal to T, and assume that T is₀Is the end time of the leading and trailing, t₁Is the start time of the trailing tail. Then front after cuttingTrailing signal x₀(t), trailing tail signal x₁(t) are respectively:

it should be noted that, although the first and third FBMC signals are truncated and the second and fourth FBMC signals are truncated, the complete tail as described above may be theoretically truncated for subsequent processing, but in actual operation, the complete tail may not be completely extracted. This is because the tail-cancellation signal is not ideally constructed in the following steps, and therefore, the signal actually has a certain damage, and the amount of data used for the tail-cancellation signal is reduced, so that the damage to the signal by the subsequent tail suppression operation can be reduced.

In yet another alternative embodiment, the transmitting end may intercept the trailing edges of the first and third FBMC signals directly and intercept the leading edges of the second and fourth FBMC signals directly. The specific interception is not limiting of the present invention.

Step two: and processing the first, second, third and fourth tail signals through an analysis filter bank respectively to obtain first, second, third and fourth frequency domain tail offset signals. Specifically, the intercepted tail signal may be processed by an analysis filter bank of the receiver, so as to obtain a tail cancellation signal a in the frequency domain (i.e. the tail cancellation signal in the frequency domain), where a is a matrix, and a line p and a column q of the element a (p, q) in the line p of the matrix are as follows:

wherein the content of the first and second substances,

for the operation of the real part, g (t) is the transmitting end of the OFDM-OQAM systemThe prototype filter is used, wherein M is the number of subcarriers, p represents the p-th subcarrier, q represents the q-th real number symbol, the row of the matrix A represents the frequency domain, and the column represents time;

the above formula is a mathematical description of the analysis filter bank, and in practical implementation, any one of the prior art techniques may be used for the analysis filter bank processing, such as the extended FFT method and the polyphase filter bank method shown in fig. 9 and 10, respectively.

Step three: and respectively constructing a first tail cancellation signal, a second tail cancellation signal, a third tail cancellation signal and a fourth tail cancellation signal through the first frequency domain tail cancellation signal, the second frequency domain tail cancellation signal, the third frequency domain tail cancellation signal and the fourth frequency domain tail cancellation signal. Specifically, as described above, N OFDM/OQAM symbols are included in one signal transmission slot, and it is assumed that the set of subcarrier numbers to which data is mapped in these symbols is L. For the front and tail, only elements which belong to the set L and are listed in the front 2K-1 range are reserved in the data A after analysis and filtering, and other elements are set to be zero; and for trailing, only elements which belong to the set L and are listed in the range of the last 2K-1 in the data A after analysis and filtering are reserved, and other elements are set to be zero. The result obtained is denoted matrix B, whose elements B (p, q) are as follows:

front tailing:

and (3) rear tailing:

the data is used to synthesize an FBMC signal (i.e., the tail cancellation signal) y (t) via the FBMC transmitter

Step four: and subtracting the first, second, third and fourth tail counteracting signals from the first, second, third and fourth FBMC signals respectively to obtain the first, second, third and fourth FBMC signals after tail counteracting. Specifically, s (t) and y (t) are subtracted from each other to obtain c (t) (i.e., the above-mentioned tail-cancelled FBMC signal), and c (t) s (t) -y (t).

Further, since the tail-cancelled signal is often not exactly the same as the original tail signal, c (t) will still contain a residual tail signal. Optionally, if the trailing amplitude or power of c (t) reaches the preset threshold, the transmitting end may return to execute step one in the optional embodiment, and replace the FBMC signal in step one with c (t), that is, repeat steps one to four until the trailing amplitude of c (t) is lower than the preset threshold.

Still further, the tail truncating operation may further include:

and fifthly, carrying out tailing truncation operation on the first, second, third and fourth FBMC signals after tailing cancellation. Specifically, the transmitting end may cancel the first and third FBMC signals t after tail cancellation₁Directly removing the trailing part later, and canceling the trailing part₀The previous tail is removed directly or a window function is used to truncate the first, second, third and fourth FBMC signals after tail cancellation. It will be appreciated that the foregoing direct removal of the tail can be viewed as a special case where the window function is rectangular.

Step S204 is to overlap and add the trailing edge of the first FBMC signal and the trailing edge of the second FBMC signal, map the resulting signals onto a first antenna, overlap and add the trailing edge of the third FBMC signal and the trailing edge of the fourth FBMC signal, and map the resulting signals onto a second antenna.

Specifically, for the first, second, third, and fourth FBMC signals after tail truncation, the trailing and leading edges of the first FBMC signal and the second FBMC signal are overlapped and added, and mapped on antenna 1 for transmission, and the trailing and leading edges of the third FBMC signal and the fourth FBMC signal are overlapped and added, and mapped on antenna 2 for transmission, where a schematic diagram of signal overlap and addition is shown in fig. 11.

In a specific implementation, a transmitting end firstly determines the length T of the overlapped FBMC signals₀The length can be predetermined or determined by signaling interactive negotiation between the transmitting end and the receiving end, and the ICI/ISI level that the system can bear is an important factor for determining the length; according to the overlapping length T₀The trailing edge of the truncated first FBMC signal and the leading edge of the second FBMC signal are overlapped and added, and the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal are overlapped and added. Specifically, if discrete time sampling of the signal is used for description, the first (third) FBMC signal is a after the tail truncation is set₀,a₁,...a_N-L,a_N-L+1,...,a_N-1The second (fourth) FBMC signal is b₀,b₁,...,b_L-1,b_L,...,b_M-1Where M, N, L are positive integers, M, N are the number of discrete sampling points of the FBMC signal pair, and L is the overlap length T₀The corresponding number of discrete sampling points. Signal s obtained by overlap-add^T＝[a₀,a₁,...,a_N-L-1,a_N-L+b₀,a_N-L+1+b₁,...,a_N-1+b_L-1,b_L,...,b_M-1](ii) a The result of the overlap-add of the first and second FBMC signals is mapped to antenna one and transmitted, and the structure of the overlap-add of the third and fourth FBMC signals is mapped to antenna two and transmitted.

In an alternative embodiment, the length T of the overlap-add₀Equal to the length of the tail portion remaining after the tail truncation operation. That is, the sum of the overlap of the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal has a length equal to the length of the trailing edge of the first FBMC signal or the leading edge of the second FBMC signal, and the lengths of the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal are equal; the sum of the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal is equal to the trailing edge of the third FBMC signal or the leading edge of the fourth FBMC signal, and the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal are equal.

In another alternative embodiment, the signals are in fixed frames in some systemsThe structure is transmitted and the length of the frame is typically an integer multiple of the length of the symbol. Thus, the length of overlap-add_T0The total length of the overlapped signals is equal to an integral multiple of the length of the FBMC symbol. That is, the total length of the signal after overlap-add of the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal is equal to an integer number of FBMC symbol lengths; the total length of the signal after overlap-add of the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal is equal to an integer number of FBMC symbol lengths.

Referring to fig. 12, fig. 12 is a schematic flowchart illustrating a method for receiving STBC codes according to an embodiment of the present invention; the method as shown in fig. 12 may include:

step S121, acquiring an FBMC signal in a transmission slot, where the FBMC signal is processed by tail truncation. It should be noted that how the receiver detects the FBMC signal in the transmission slot is understood by those skilled in the art, and will not be described herein.

In step S122, the leading-trailing length and the trailing-trailing length are determined. The front trailing length and the rear trailing length can be agreed in advance, and the transmitter and the receiver can be agreed in advance; or the transmitting end and the receiving end may negotiate and determine through signaling interaction, which is not limited in the present invention.

Step S123, adding several zeros in the front end of the FBMC signal, and adding several zeros in the back end of the FBMC signal, wherein the zeros are the same as the front tail length. The length of the tail can be represented by the number of the sampling points, so that the same number of zeros refers to the same number of zeros as the number of the sampling points of the tail length. Specifically, after acquiring the FBMC signal and the tail length, the transmitting end may complement a front end of the FBMC signal with a plurality of zeros having the same length as the front tail length, and complement a rear end of the FBMC signal with a plurality of zeros having the same length as the rear tail length, so that the received FBMC signal has an Alamouti code characteristic.

And step S124, carrying out Alamouti combination processing on the FBMC signals after tailing processing. Specifically, the FBMC signal processing after zero padding is the same as that of a general FBMC receiver, and the received time domain FBMC signal is changed into a frequency domain, and since the STBC code at the transmitting end meets the Alamouti characteristic, the subsequent processing is performed as in the case of the general Alamouti combination, and then demodulation and decoding are performed, which is not described herein again.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention; as shown in fig. 13, the transmitting end 13 at least includes a code block generating module 131, an FBMC signal generating module 132, a puncturing operation module 133, and a transmitting module 134, wherein:

a code block generating module 131 generates a first, a second, a third and a fourth STBC code block, an FBMC signal generating module 132 generates a first, a second, a third and a fourth FBMC signal according to the first, the second, the third and the fourth STBC code block, respectively, the FBMC signal including a tail, a truncating operation module 133 for performing a tail truncating operation on the first and the third FBMC signal, respectively, and performing a tail truncating operation on the second and the fourth FBMC signal, respectively, a transmitting module 134 for adding a tail of the first FBMC signal and a tail of the second FBMC signal and mapping them on a first antenna, and adding a tail of the third FBMC signal and a tail of the fourth FBMC signal and mapping them on a second antenna.

In an alternative embodiment, the truncating operation module 133 further includes a window function generating unit 1331 and a truncating operation unit 1332 as shown in fig. 14, where:

the window function generating unit 1331 generates first, second, third and fourth window functions for performing a tail truncation operation on the first, second, third and fourth FBMC signals, respectively, and the truncation operation unit 1332 performs a tail truncation operation on the first, second, third and fourth FBMC signals through the first, second, third and fourth window functions, respectively.

In another alternative embodiment, the truncating operation module 133 further includes a truncating unit 1333, an analysis filter bank 1334, a tail cancellation signal obtaining unit 1335, and a tail cancellation unit 1336 as shown in fig. 15, where:

an intercepting unit 1333 performs trailing interception on the first and third FBMC signals to obtain first and third trailing signals, and performs leading interception on the second and fourth FBMC signals to obtain second and fourth trailing signals, an analyzing filter bank 1334 processes the first, second, third and fourth trailing signals to obtain first, second, third and fourth frequency domain trailing offset signals, a trailing offset signal obtaining unit 1335 constructs first, second, third and fourth trailing offset signals through the first, second, third and fourth frequency domain trailing offset signals, and a trailing offset unit 1336 subtracts the first, second, third and fourth trailing offset signals from the first, second, third and fourth FBMC signals to obtain first, second, third and fourth FBMC signals after trailing offset.

Further, the truncating operation module 133 may further include a truncating unit 1337, as shown in fig. 15, for performing a tail truncating operation on the first, second, third, and fourth FBMC signals after tail cancellation.

Still further, as shown in fig. 15, the truncating operation module 133 may further include a determining unit 1338, configured to determine whether trailing amplitudes or powers of the first, second, third, and fourth FBMC signals after the trailing cancellation reach a preset threshold, if so, trigger the truncating unit 1333 to perform trailing truncation on the first and third FBMC signals respectively to obtain first and third trailing signals, and perform leading truncation on the second and fourth FBMC signals respectively to obtain second and fourth trailing signals, where the first, second, third, and fourth FBMC signals are the first, second, third, and fourth FBMC signals after the trailing cancellation.

It should be noted that the truncating operation modules shown in fig. 14 and fig. 15 may be in the same transmitting end, that is, one transmitting end may include both the truncating operation modules shown in fig. 14 and fig. 15; the truncating operation module shown in fig. 14 and 15 may also be in a different transmitting end, and the invention is not limited thereto.

Optionally, the length of overlap-add of the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal is equal to the length of the trailing edge of the first FBMC signal or the leading edge of the second FBMC signal, and the length of the trailing edge of the first FBMC signal and the length of the leading edge of the second FBMC signal are equal; or, the total length of the signals after the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal are overlapped and added is equal to integral multiple of the FBMC symbol length;

The code block generating module 131 further includes a code block acquiring unit 1311 and a code block generating unit 1312 as shown in fig. 16, wherein:

a code block obtaining unit 1311 obtains an STBC code block to be transmitted, where the STBC code block to be transmitted is a signal to be transmitted on a subcarrier by a transmitting antenna, and a code block generating unit 1312 generates the first, second, third, and fourth STBC code blocks according to the STBC code block to be transmitted, where the STBC code block to be transmitted includes 2 × M × N data, and M and N are integers greater than 1.

In an optional implementation manner, the code block obtaining unit 1311 may divide the STBC code block to be transmitted into a first sub-STBC code block and a second sub-STBC code block, where the first STBC code block is the first sub-STBC code block or is obtained by multiplying the first sub-STBC code block by-1 at a first specified position, the third STBC code block is the second sub-STBC code block or is obtained by multiplying the second sub-STBC code block by-1 at a second specified position, the second STBC code block is obtained by arranging the third STBC code block in a reverse order of columns, multiplying each column by-1, and taking a complex conjugate, and the fourth STBC code block is obtained by arranging the first STBC block in a reverse order of columns and taking a complex conjugate.

In another alternative embodiment, the code block obtaining unit 1311 may divide the STBC code block to be transmitted into a first sub-STBC code block and a second sub-STBC code block, where the first STBC code block is the first sub-STBC code block or is obtained by multiplying the first sub-STBC code block by-1 at a first specified position, the third STBC code block is the second sub-STBC code block or is obtained by multiplying the second sub-STBC code block by-1 at a second specified position, the second STBC code block is obtained by arranging the third STBC code block in a reverse order of columns and multiplying each column by-1 and taking a complex conjugate, and the fourth STBC code block is obtained by arranging the first STBC block in a reverse order of columns.

Alternatively, the FBMC signal generation module 132 may map the first STBC code block onto consecutive N symbols on consecutive M subcarriers of the first antenna, and processing the first FBMC signal by a preset processing mode to obtain a second STBC code block, mapping the second STBC code block on continuous N symbols on continuous M subcarriers which are adjacent to the first STBC code block in time domain and have the same position in frequency domain in the first antenna, and the second FBMC signal is obtained through the preset processing mode, the third STBC code block is mapped on the same time-frequency position of the second antenna and the first STBC code block, and processing the third FBMC signal by the preset processing mode, mapping the fourth STBC code block on the same time-frequency position of the second antenna and the second STBC code block, and processing the fourth FBMC signal by the preset processing mode.

It can be understood that the functions of each functional module of the transmitting end 13 in this embodiment can be implemented according to the method in the foregoing method embodiment, and the related description of the method embodiment in fig. 2 may be referred to specifically, and will not be described herein again.

Referring to fig. 17, fig. 17 is a schematic structural diagram of another transmitting end according to an embodiment of the present invention. As shown in fig. 17, the transmitting end may include: at least one processor 171, e.g., a CPU, at least one network interface 173, memory 174, at least one communication bus 172. Wherein a communication bus 172 is used to enable connective communication between these components. The network interface 173 in embodiments of the present invention includes a first antenna 1731 and a second antenna 1732.

The processor 171 is a control center of the transmitting end, connects various parts of the entire transmitting end using various interfaces and lines, and performs various functions of the transmitting end and/or processes data by running or executing software programs and/or modules stored in the memory and calling data stored in the memory. The processor 171 may be composed of an Integrated Circuit (IC), for example, a single packaged IC, or a plurality of packaged ICs with the same or different functions. For example, the Processor 171 may include only a Central Processing Unit (CPU), or may be a combination of a GPU and a Digital Signal Processor (DSP).

The memory 174 may be used to store software programs and modules, and the processor 171 executes various functional applications of the transmitting end and implements data processing by operating the software programs and modules stored in the memory 174. In an embodiment of the present invention, the Memory 174 may include a volatile Memory, such as a Nonvolatile dynamic Random Access Memory (NVRAM), a Phase change Random Access Memory (PRAM), a Magnetoresistive Random Access Memory (MRAM), and a non-volatile Memory, such as at least one magnetic disk Memory device, an electrically erasable Programmable Read-Only Memory (EEPROM), a flash Memory device, such as a NAND flash Memory, or a nor flash Memory. The non-volatile memory stores an operating system executed by the processor. Memory 174 loads operating programs and data from the non-volatile memory into memory and stores digital content in mass storage devices. The operating system includes various components and/or drivers for controlling and managing conventional system tasks, such as memory management, storage device control, power management, etc., as well as facilitating communication between various hardware and software components.

The memory 174 stores a set of STBC encoded transmitted codes of FBMC, which the processor 171 can call to: generating first, second, third and fourth STBC code blocks, generating first, second, third and fourth FBMC signals from the first, second, third and fourth STBC code blocks, respectively, the FBMC signals including a tail, performing a tail-tail truncation on the first and third FBMC signals, respectively, and performing a tail-tail truncation on the second and fourth FBMC signals, respectively, overlap-adding the tail-tail of the first FBMC signal and the tail-tail of the second FBMC signal and mapping on a first antenna 1731, overlap-adding the tail-tail of the third FBMC signal and the tail-tail of the fourth FBMC signal and mapping on a second antenna 1732.

It can be understood that, in this implementation manner, the functions of each functional module of the transmitting end 17 may be specifically implemented according to the method in the embodiment of the method shown in fig. 2, and may specifically correspond to the related description of fig. 2, which is not described herein again.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a receiving end according to an embodiment of the present invention. As shown in fig. 18, the receiving end may include at least an FBMC signal obtaining module 181, a tail length determining module 182, a first processing module 183, and a second processing module 184, where:

the FBMC signal acquiring module 181 acquires an FBMC signal in a transmission slot, the FBMC signal is processed by tail truncation, the tail length determining module 182 determines a front tail length and a rear tail length, the first processing module 183 complements a plurality of zeros at the front end of the FBMC signal, which are the same as the front tail length, complements a plurality of zeros at the rear end of the FBMC signal, which are the same as the rear tail length, and the second processing module 184 combines the FBMC signal after tail processing by Alamouti.

It is to be understood that the functions of each functional module of the transmitting end 18 in this embodiment can be specifically implemented according to the method in the foregoing method embodiment, and reference may be made to the related description of the method embodiment in fig. 12, which is not repeated herein.

Referring to fig. 19, fig. 19 is a schematic structural diagram of another receiving end according to an embodiment of the present invention. As shown in fig. 19, the receiving end may include: at least one processor 191, such as a CPU, at least one network interface 193, memory 194, at least one communication bus 192. Wherein a communication bus 192 is used to enable connective communication between these components. The network interface 193 in embodiments of the present invention includes a first antenna 1931 and a second antenna 1932.

The processor 191 is a control center of the receiving end, connects various parts of the entire receiving end using various interfaces and lines, and performs various functions of the receiving end and/or processes data by running or executing software programs and/or modules stored in the memory and calling data stored in the memory. The processor 191 may be formed of an Integrated Circuit (IC), for example, a single packaged IC, or a plurality of packaged ICs connected with the same or different functions. For example, the Processor 191 may include only a Central Processing Unit (CPU), or may be a combination of a GPU and a Digital Signal Processor (DSP).

The memory 194 may be used to store software programs and modules, and the processor 191 executes various functional applications on the receiving end and implements data processing by operating the software programs and modules stored in the memory 194. In an embodiment of the present invention, the Memory 194 may include a volatile Memory, such as a Nonvolatile dynamic Random Access Memory (NVRAM), a Phase change Random Access Memory (PRAM), a Magnetoresistive Random Access Memory (MRAM), and a non-volatile Memory, such as at least one magnetic disk Memory device, an electrically erasable Programmable Read-Only Memory (EEPROM), a flash Memory device, such as a NAND flash Memory, or a nor flash Memory. The non-volatile memory stores an operating system executed by the processor. Memory 194 loads operating programs and data from the non-volatile memory into memory and stores digital content in mass storage devices. The operating system includes various components and/or drivers for controlling and managing conventional system tasks, such as memory management, storage device control, power management, etc., as well as facilitating communication between various hardware and software components.

The memory 194 has stored therein a set of FBMC STBC encoded received codes that the processor 191 may call to:

acquiring an FBMC signal in a transmission time slot, wherein the FBMC signal is processed by tail truncation, determining a front tail length and a rear tail length, supplementing a plurality of zeros which are the same as the front tail length on the front end of the FBMC signal, supplementing a plurality of zeros which are the same as the rear tail length on the rear end of the FBMC signal, and combining the FBMC signal after tail processing by Alamouti.

It is to be understood that, in this implementation manner, the functions of each functional module of the receiving end 19 may be specifically implemented according to the method in the embodiment of the method shown in fig. 12, and may specifically correspond to the related description of fig. 12, which is not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. A transmission method of STBC coding, comprising:

generating first, second, third and fourth STBC code blocks;

generating first, second, third and fourth FBMC signals from the first, second, third and fourth STBC code blocks, respectively, the FBMC signals including a tail;

respectively carrying out trailing truncation operation on the first FBMC signal and the third FBMC signal, and respectively carrying out leading-trailing truncation operation on the second FBMC signal and the fourth FBMC signal;

and mapping the trailing overlap of the first FBMC signal and the leading overlap of the second FBMC signal on a first antenna, and mapping the trailing overlap of the third FBMC signal and the leading overlap of the fourth FBMC signal on a second antenna.

2. The method of claim 1,

the performing trailing truncation on the first and third FBMC signals, respectively, and performing leading truncation on the second and fourth FBMC signals, respectively, comprises:

generating first, second, third and fourth window functions for performing tail truncation operations on the first, second, third and fourth FBMC signals, respectively;

performing a tail truncation operation on the first, second, third and fourth FBMC signals by the first, second, third and fourth window functions, respectively.

3. The method of claim 1,

respectively carrying out trailing cutting on the first FBMC signal and the third FBMC signal to obtain a first trailing signal and a third trailing signal, and respectively carrying out leading cutting on the second FBMC signal and the fourth FBMC signal to obtain a second trailing signal and a fourth trailing signal;

processing the first, second, third and fourth tail signals through an analysis filter bank respectively to obtain first, second, third and fourth frequency domain tail offset signals;

constructing a first, a second, a third and a fourth tail counteracting signal respectively through the first, the second, the third and the fourth frequency domain tail counteracting signals;

and subtracting the first, second, third and fourth tail counteracting signals from the first, second, third and fourth FBMC signals respectively to obtain the first, second, third and fourth FBMC signals after tail counteracting.

4. The method of claim 3, wherein after subtracting the first, second, third, and fourth tail cancellation signals from the first, second, third, and fourth FBMC signals, respectively, to obtain tail cancelled first, second, third, and fourth FBMC signals, further comprising:

and performing tail truncation operation on the first, second, third and fourth FBMC signals after tail cancellation.

5. The method of claim 3 or 4, wherein subtracting the first, second, third, and fourth tail cancellation signals from the first, second, third, and fourth FBMC signals, respectively, to obtain tail cancelled first, second, third, and fourth FBMC signals, further comprises:

judging whether the trailing amplitude or power of the first, second, third and fourth FBMC signals after trailing offset reaches a preset threshold value;

if yes, the step of respectively carrying out trailing cutting on the first FBMC signal and the third FBMC signal to obtain a first trailing signal and a third trailing signal is carried out, and the step of respectively carrying out leading cutting on the second FBMC signal and the fourth FBMC signal to obtain a second trailing signal and a fourth trailing signal is carried out, wherein when the step of carrying out the return, the first FBMC signal, the second FBMC signal, the third FBMC signal and the fourth FBMC signal are the first FBMC signal, the second FBMC signal, the third FBMC signal and the fourth FBMC signal after trailing cancellation.

6. A transmission method for STBC coding, characterized in that it has all the features of the method of any one of claims 1 to 5 and,

the sum length of the overlap of the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal is equal to the length of the trailing edge of the first FBMC signal or the leading edge of the second FBMC signal, and the length of the trailing edge of the first FBMC signal and the length of the leading edge of the second FBMC signal are equal; or, the total length of the signals after the trailing edge of the first FBMC signal and the leading edge of the second FBMC signal are overlapped and added is equal to integral multiple of the FBMC symbol length;

7. A transmission method for STBC coding, having all the features of the method of any one of claims 1 to 6,

the generating of the first, second, third and fourth STBC code blocks comprises:

obtaining an STBC code block to be sent, wherein the STBC code block to be sent is a signal to be sent on a subcarrier by a transmitting antenna, the STBC code block to be sent comprises 2M N data, and M and N are integers more than 1;

and generating the first, second, third and fourth STBC code blocks according to the STBC code block to be sent.

8. The method of claim 7, wherein the generating the first, second, third, and fourth STBC code blocks from the STBC code block to be transmitted comprises:

dividing the STBC code block to be transmitted into a first sub STBC code block and a second sub STBC code block;

the first STBC code block is the first sub-STBC code block or is obtained by multiplying the first sub-STBC code block by-1 at a first designated position;

the third STBC block is the second sub STBC block or is obtained by multiplying the second sub STBC block by-1 at a second designated position;

the second STBC code block is obtained by arranging the third STBC code blocks in a reverse order of columns, multiplying each column by-1 and taking a complex conjugate;

the fourth STBC block is obtained by arranging the first STBC blocks in reverse order of columns and taking complex conjugates.

9. The method of claim 7, wherein the generating the first, second, third, and fourth STBC code blocks from the STBC code block to be transmitted comprises:

the fourth STBC block is obtained by arranging the first STBC blocks in a reverse order of columns.

10. A transmission method for STBC coding, characterized in that it has all the features of the method of any one of claims 1 to 9 and,

the generating first, second, third and fourth FBMC signals from the first, second, third and fourth STBC code blocks, respectively, comprises:

mapping the first STBC code block on continuous N symbols on continuous M subcarriers of a first antenna, and processing the symbols in a preset processing mode to obtain a first FBMC signal;

mapping the second STBC code block on continuous N symbols on continuous M subcarriers adjacent to the first STBC code block in time domain and identical in frequency domain position in the first antenna, and processing the symbols in the preset processing mode to obtain a second FBMC signal;

mapping the third STBC code block on the same time-frequency position of a second antenna and the first STBC code block, and processing the third STBC code block in the preset processing mode to obtain a third FBMC signal;

and mapping the fourth STBC code block on the same time-frequency position of the second antenna and the second STBC code block, and processing by the preset processing mode to obtain the fourth FBMC signal.

11. A receiving method of STBC coding, comprising,

acquiring an FBMC signal in a transmission time slot, wherein the FBMC signal is processed by tail truncation;

determining a front-tail length and a rear-tail length;

a leading complement of the FBMC signal has the same number of zeros as the leading tail length and a trailing complement of the FBMC signal has the same number of zeros as the trailing tail length;

and carrying out Alamouti combination treatment on the FBMC signals after tailing treatment.

12. A transmitting end, comprising:

a code block generating module for generating first, second, third and fourth STBC code blocks;

an FBMC signal generating module for generating first, second, third and fourth FBMC signals from the first, second, third and fourth STBC code blocks, respectively, the FBMC signals including a tail;

a truncating operation module, configured to perform trailing truncating operation on the first and third FBMC signals, and perform leading truncating operation on the second and fourth FBMC signals;

and a transmitting module, configured to overlap and add a trailing edge of the first FBMC signal and a leading edge of the second FBMC signal, map the overlapping and adding the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal, and map the overlapping and adding the trailing edge of the third FBMC signal and the leading edge of the fourth FBMC signal on a second antenna.

13. The transmitting end as claimed in claim 12, wherein said puncturing module comprises:

a window function generating unit for generating a first, a second, a third and a fourth window functions for performing a tail truncation operation on the first, the second, the third and the fourth FBMC signals, respectively;

a truncating operation unit for performing a tail truncating operation on the first, second, third and fourth FBMC signals by the first, second, third and fourth window functions, respectively.

14. The transmitting end as claimed in claim 12, wherein said puncturing module comprises:

an intercepting unit, configured to perform trailing interception on the first and third FBMC signals respectively to obtain first and third trailing signals, and perform leading interception on the second and fourth FBMC signals respectively to obtain second and fourth trailing signals;

an analysis filter bank for processing the first, second, third and fourth tail signals to obtain first, second, third and fourth frequency domain tail cancellation signals;

a tail cancellation signal obtaining unit, configured to construct a first tail cancellation signal, a second tail cancellation signal, a third tail cancellation signal and a fourth tail cancellation signal respectively according to the first frequency domain tail cancellation signal, the second frequency domain tail cancellation signal, the third frequency domain tail cancellation signal and the fourth frequency domain tail cancellation signal;

and the tailing cancellation unit is used for subtracting the first, second, third and fourth tailing cancellation signals from the first, second, third and fourth FBMC signals respectively to obtain the first, second, third and fourth FBMC signals after tailing cancellation.

15. The transmitting end of claim 14,

the truncate operation module further comprises:

and the truncation unit is used for performing tailing truncation operation on the first, second, third and fourth FBMC signals after tailing cancellation.

16. The transmitting end according to claim 14 or 15,

the truncate operation module further comprises:

and the judging unit is used for judging whether the trailing amplitude or power of the first, second, third and fourth FBMC signals after trailing offset reaches a preset threshold value, if so, triggering the intercepting unit to respectively carry out trailing interception on the first and third FBMC signals to obtain first and third trailing signals, and respectively carrying out leading trailing interception on the second and fourth FBMC signals to obtain second and fourth trailing signals, wherein the first, second, third and fourth FBMC signals are the first, second, third and fourth FBMC signals after trailing offset.

17. A transmitting terminal, characterized in that it has all the features of the transmitting terminal of any one of claims 12 to 16 and,

18. A transmitting terminal, characterized in that it has all the features of the transmitting terminal of any one of claims 14 to 17 and,

the code block generation module includes:

a code block obtaining unit, configured to obtain an STBC code block to be sent, where the STBC code block to be sent is a signal to be sent on a subcarrier by a transmitting antenna, where the STBC code block to be sent includes 2 × M × N data, and M and N are integers greater than 1;

a code block generating unit, configured to generate the first, second, third, and fourth STBC code blocks according to the STBC code block to be sent.

19. The transmitting end of claim 18,

the code block generating unit is specifically configured to:

20. The transmitting end of claim 18,

the code block generating unit is specifically configured to:

21. A transmitting terminal, characterized in that it has all the features of the transmitting terminal of any one of claims 12 to 20 and,

the FBMC signal generation module is specifically configured to:

22. A receiver, comprising,

an FBMC signal acquisition module, configured to acquire an FBMC signal in a transmission time slot, where the FBMC signal is processed by tail truncation;

a tail length determination module for determining a front tail length and a rear tail length;

a first processing module, configured to complement a front end of the FBMC signal with a number of zeros that is the same as the front tail length, and complement a back end of the FBMC signal with a number of zeros that is the same as the back tail length;

and the second processing module is used for carrying out Alamouti combination processing on the FBMC signals after tailing processing.

23. A transmitting end comprising a network port, a memory and a processor, wherein the memory stores a set of STBC encoded transmission programs and the processor is configured to invoke said programs stored in the memory, and to perform steps comprising any of the steps of claims 1-10.

24. A receiver comprising a network port, a memory and a processor, wherein the memory stores a set of STBC encoded receiver programs, and the processor is configured to call the program stored in the memory, and perform steps comprising the steps of claim 11.

25. A computer-readable storage medium, characterized in that it stores a computer program, wherein the computer program is capable of implementing the method of any one of claims 1 to 10 when executed by hardware.

26. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, wherein the computer program is capable of implementing the method of claim 11 when executed by hardware.