CN112073096B

CN112073096B - Signal sending and receiving method and device of MIMO transmission system based on polarization transformation

Info

Publication number: CN112073096B
Application number: CN202010740050.9A
Authority: CN
Inventors: 牛凯; 朴瑨楠
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-05-25
Anticipated expiration: 2040-07-28
Also published as: CN112073096A

Abstract

One or more embodiments of the present disclosure provide a signal sending method for a MIMO transmission system based on polarization transformation, where a signal sending end in the MIMO transmission system determines, according to data to be sent, symbol streams corresponding to N sending time slots, respectively; the signal transmitting end can respectively determine the transmitting symbol vectors respectively corresponding to the N transmitting time slots; the signal sending end respectively carries out precoding on modulation symbol vectors respectively corresponding to each sending time slot according to a precoding codebook to obtain sending symbol vectors respectively corresponding to each sending time slot; and the signal sending end sends the sending symbol vectors respectively corresponding to the sending time slots to the signal receiving end in the MIMO transmission system in sequence. Thus, the embodiment can reduce the error rate in the transmission process of the sending symbol vector, thereby improving the reliability transmission of data and the performance gain of data transmission.

Description

Signal sending and receiving method and device of MIMO transmission system based on polarization transformation

Technical Field

One or more embodiments of the present disclosure relate to the field of communications technologies, and in particular, to a signal transmitting method and a signal receiving method for a MIMO transmission system based on polarization transformation, and an apparatus for the same.

Background

The massive MIMO (multiple input multiple output) antenna technology is an important physical layer technology for increasing system capacity in 5G. However, the antenna configuration of massive MIMO greatly increases the power consumption of the system, and it is difficult to meet the requirement of the 5G green communication mode. Therefore, a massive MIMO solution with high speed, low delay and low power consumption becomes a research hotspot.

Polar Code (Polar Code) is the only channel coding technique that can theoretically prove to reach shannon limit at present and has practical linear complexity coding and decoding capability, and becomes a strong candidate for a channel coding scheme in a next generation communication system 5G, and can be used as a coding scheme of a control channel.

That is, the polarization encoding method can substantially achieve shannon capacity (the highest information rate achievable with an arbitrarily small error probability) by using low encoding/decoding complexity, and the MIMO antenna technology can be used to improve the capacity and reliability of a channel. Therefore, a system integrating polarization coding and MIMO antenna technology at the same time is needed to realize efficient application of polarization codes in MIMO channels.

Disclosure of Invention

In view of the above, an object of one or more embodiments of the present disclosure is to provide a signal transmitting and receiving method for a MIMO transmission system based on polarization transformation, so as to implement a scheme for applying a polarization code to a communication system of MIMO antennas, so that an error rate is reduced during transmission of a transmitted symbol vector, thereby improving reliable data transmission and performance gain of data transmission.

In view of the above, one or more embodiments of the present specification provide a signal sending method for a MIMO transmission system based on polarization transformation, which is applied to a signal sending end in the MIMO transmission system, and includes:

determining symbol streams respectively corresponding to N sending time slots according to data to be sent, wherein N is a positive integer;

respectively determining the transmitting symbol vectors respectively corresponding to the N transmitting time slots; wherein, the determination method of the transmission symbol vector corresponding to the tth transmission slot in the N transmission slots is as follows: determining a sending symbol vector corresponding to the tth sending time slot according to a symbol stream corresponding to the tth sending time slot; t is a positive integer and is less than or equal to N;

according to a precoding codebook, respectively precoding modulation symbol vectors respectively corresponding to each sending time slot to obtain sending symbol vectors respectively corresponding to each sending time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook;

and sequentially transmitting the transmitting symbol vectors respectively corresponding to the transmitting time slots to a signal receiving end in the MIMO transmission system.

Optionally, the determining, according to the symbol stream corresponding to the tth sending slot, a sending symbol vector corresponding to the tth sending slot includes:

and for the t-th sending time slot, determining the polar code blocks respectively corresponding to all the symbol code blocks in the symbol stream of the t-th sending time slot, and determining the modulation symbol vector corresponding to the i-th sending time slot according to all the polar code blocks corresponding to the t-th sending time slot.

Optionally, each transmission slot corresponds to at least one symbol stream; the determining the polar code blocks respectively corresponding to each symbol code block in the symbol stream of the tth transmission time slot, and determining the modulation symbol vector corresponding to the tth transmission time slot according to each polar code block corresponding to the tth transmission time slot includes:

determining modulation symbol vectors respectively corresponding to each symbol stream of the tth sending time slot; wherein, the determination method of the modulation symbol vector corresponding to the ith symbol stream in the tth transmission slot is as follows: for an ith symbol stream, coding according to each symbol code block in the ith symbol stream to obtain a polar code block corresponding to each symbol code block in the ith symbol stream respectively, and determining a modulation symbol vector corresponding to the ith symbol stream according to the polar code block corresponding to each symbol code block in the ith symbol stream respectively; i is a positive integer;

and taking the modulation symbol vectors respectively corresponding to all the symbol streams of the tth sending time slot as the modulation symbol vectors corresponding to the tth sending time slot.

Optionally, the precoding codebook is determined according to a channel response matrix and a precoding selection principle of the MIMO transmission system; the channel response matrix is a matrix with the same size, is the number of transmitting antennas of the signal transmitting end, and is the number of receiving antennas of the signal receiving end in the MIMO transmission system; the precoding selection principle corresponding to the polarized precoding codebook is a maximum polarization effect criterion, and the polarized precoding codebook is a data stream displacement codebook; the precoding selection principle corresponding to the capacity maximization precoding codebook is a minimum norm criterion or a maximum system capacity criterion, and the capacity maximization precoding codebook is a DFT codebook or a Hadamard codebook.

One or more embodiments of the present specification provide a signal transmitting apparatus for a MIMO transmission system based on polarization transformation, which is applied to a signal transmitting end in the MIMO transmission system, and includes:

a symbol stream determining unit, configured to determine, according to data to be sent, symbol streams corresponding to N sending time slots, respectively, where N is a positive integer;

a symbol vector determining unit, configured to determine the transmission symbol vectors corresponding to the N transmission slots, respectively; wherein, the determination method of the transmission symbol vector corresponding to the tth transmission slot in the N transmission slots is as follows: determining a sending symbol vector corresponding to the tth sending time slot according to a symbol stream corresponding to the tth sending time slot; t is a positive integer, and i is not more than N;

a transmitting symbol determining unit, configured to perform precoding on modulation symbol vectors respectively corresponding to each transmitting time slot according to a precoding codebook, to obtain transmitting symbol vectors respectively corresponding to each transmitting time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook;

and the signal sending unit is used for sequentially sending the sending symbol vectors respectively corresponding to the sending time slots to a signal receiving end.

One or more embodiments of the present specification provide a signal receiving method for a MIMO transmission system based on polarization transformation, which is applied to a signal receiving end in the MIMO transmission system, and includes:

obtaining receiving symbol vectors respectively corresponding to N sending time slots; the receiving symbol vector corresponding to the tth sending time slot is determined according to the channel response matrix corresponding to the tth sending time slot and the sending symbol vector corresponding to the tth sending time slot sent by the signal sending end; n is a positive integer, t is a positive integer, and t is less than or equal to N;

respectively determining symbol stream detection results respectively corresponding to the N sending time slots; wherein, the determination method of the symbol stream detection result corresponding to the tth sending time slot in the N sending time slots is as follows: and determining a symbol stream detection result corresponding to the tth sending time slot according to the receiving symbol vector corresponding to the tth sending time slot.

Optionally, the determining, according to the received symbol vector corresponding to the tth sending time slot, a symbol stream detection result corresponding to the tth sending time slot includes:

for the t-th sending time slot, according to the receiving symbol vector corresponding to the t-th sending time slot, serial interference elimination detection processing is respectively carried out on each symbol stream in the t-th sending time slot, and the likelihood probability of the modulation symbol corresponding to each symbol stream is obtained;

respectively determining the symbol stream detection results respectively corresponding to the symbol streams; wherein, the determination method of the symbol stream detection result corresponding to the ith symbol stream in the tth transmission slot is as follows: for an ith symbol stream, determining a symbol stream detection result corresponding to the ith symbol stream according to the likelihood probability of a modulation symbol corresponding to the ith symbol stream and each polar code block in the ith symbol stream;

and taking the symbol stream detection result respectively corresponding to all the symbol streams of the tth sending time slot as the symbol stream detection result corresponding to the tth sending time slot.

Optionally, the performing, for the tth sending time slot, serial interference cancellation detection processing on each symbol stream in the tth sending time slot according to the received symbol vector corresponding to the tth sending time slot, to obtain a likelihood probability of a modulation symbol corresponding to each symbol stream includes:

for the t-th sending time slot, respectively determining the likelihood probability of QAM modulation symbols respectively corresponding to each symbol stream in the t-th time slot according to the receiving symbol vector corresponding to the t-th sending time slot;

and determining the likelihood probability of the PAM modulation symbol corresponding to each symbol stream in the t-th time slot according to the likelihood probability of the QAM modulation symbol corresponding to each symbol stream in the t-th time slot.

Optionally, the determining, for the ith symbol stream, a symbol stream detection result corresponding to the ith symbol stream according to the likelihood probability of the modulation symbol corresponding to the ith symbol stream and each polar code block in the ith symbol stream includes:

for a first polar code block in the ith symbol stream, demodulating the first polar code block in the ith symbol stream according to the likelihood probability of a modulation symbol corresponding to the ith symbol stream to obtain a log-likelihood ratio vector corresponding to the first polar code block; decoding the first polarized code block according to the log-likelihood ratio vector corresponding to the first polarized code block to obtain a decoding code word corresponding to the first polarized code block;

for each non-first polar code block in the ith symbol stream, demodulating the non-first polar code block according to the likelihood probability of the modulation symbol corresponding to the ith symbol stream and the decoding code word respectively corresponding to each polar code block before the non-first polar code block in the ith symbol stream to obtain a log-likelihood ratio vector corresponding to the non-first polar code block; decoding the non-first polarized code block according to the log-likelihood ratio vector corresponding to the non-first polarized code block to obtain a decoding code word corresponding to the non-first polarized code block;

and taking the decoding code words respectively corresponding to the polarization code blocks in the ith symbol stream as the symbol stream detection results corresponding to the ith symbol stream.

One or more embodiments of the present specification provide a signal receiving apparatus for a MIMO transmission system based on polarization transformation, which is applied to a signal receiving end in the MIMO transmission system, and includes:

a vector obtaining unit, configured to obtain received symbol vectors corresponding to the N sending time slots, respectively; the receiving symbol vector corresponding to the tth sending time slot is determined according to the channel response matrix corresponding to the tth sending time slot and the sending symbol vector corresponding to the tth sending time slot sent by the signal sending end; n is a positive integer, t is a positive integer, and t is less than or equal to N;

a result determining unit, configured to determine symbol stream detection results respectively corresponding to the N sending timeslots respectively; wherein, the determination method of the symbol stream detection result corresponding to the tth sending time slot in the N sending time slots is as follows: and determining a symbol stream detection result corresponding to the tth sending time slot according to the receiving symbol vector corresponding to the tth sending time slot.

As can be seen from the foregoing, in the signal sending method of the MIMO transmission system based on polarization transformation provided in one or more embodiments of the present specification, a signal sending end in the MIMO transmission system may first determine, according to data to be sent, symbol streams corresponding to N sending time slots respectively, where N is a positive integer; then, the signal transmitting end can respectively determine the transmitting symbol vectors respectively corresponding to the N transmitting time slots; then, the signal sending end can respectively pre-code the modulation symbol vectors respectively corresponding to each sending time slot according to the pre-coding codebook to obtain the sending symbol vectors respectively corresponding to each sending time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook; finally, the signal transmitting end may sequentially transmit the transmission symbol vectors respectively corresponding to the transmission time slots to the signal receiving end in the MIMO transmission system. In this way, in this embodiment, the precoding codebook including the polarization precoding codebook and the capacity maximization precoding codebook may be used to obtain the transmission symbol vectors corresponding to the respective transmission timeslots, so that a scheme of applying the polarization codes to the communication system of the MIMO antenna is implemented, and thus, in the transmission process of the transmission symbol vectors, the error rate is reduced, and thus, the reliable transmission of data and the performance gain of data transmission may be improved.

Drawings

In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.

FIG. 1 is a block diagram of an exemplary application scenario provided in an embodiment of the present invention;

fig. 2 is a flowchart illustrating a signal transmission method of a MIMO transmission system based on polarization transformation according to an embodiment of the present invention;

FIG. 3 is a block diagram of a further exemplary application scenario provided in an embodiment of the present invention;

fig. 4 is a flowchart illustrating a signal receiving method of a MIMO transmission system based on polarization transformation according to one or more embodiments of the present disclosure;

FIG. 5 is a block diagram of another exemplary application scenario provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a signal transmitting apparatus of a MIMO transmission system based on polarization transformation according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a signal receiving apparatus of a MIMO transmission system based on polarization transformation according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The inventors have studied to find that the polarization encoding method can substantially achieve shannon capacity (the highest information rate achievable with an arbitrarily small error probability) by using low encoding/decoding complexity, and that MIMO antenna technology can be used to improve the capacity and reliability of a channel. Therefore, a system integrating polarization coding and MIMO antenna technology at the same time is needed to realize efficient application of polarization codes in MIMO channels.

Therefore, the invention provides a signal sending method of a MIMO transmission system based on polarization transformation, wherein a signal sending end in the MIMO transmission system can firstly determine symbol streams respectively corresponding to N sending time slots according to data to be sent, wherein N is a positive integer; then, the signal transmitting end can respectively determine the transmitting symbol vectors respectively corresponding to the N transmitting time slots; then, the signal sending end can respectively pre-code the modulation symbol vectors respectively corresponding to each sending time slot according to the pre-coding codebook to obtain the sending symbol vectors respectively corresponding to each sending time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook; finally, the signal transmitting end may sequentially transmit the transmission symbol vectors respectively corresponding to the transmission time slots to the signal receiving end in the MIMO transmission system. In this way, in this embodiment, the precoding codebook including the polarization precoding codebook and the capacity maximization precoding codebook may be used to obtain the transmission symbol vectors corresponding to the respective transmission timeslots, so that a scheme of applying the polarization codes to the communication system of the MIMO antenna is implemented, and thus, in the transmission process of the transmission symbol vectors, the error rate is reduced, and thus, the reliable transmission of data and the performance gain of data transmission may be improved.

For example, the embodiment of the present invention may be applied to a signal transmission system of a MIMO transmission system based on polarization transformation as shown in fig. 1, where the system may include a signal transmitting end and a signal receiving end as shown in fig. 1. The signal transmitting end can firstly determine symbol streams respectively corresponding to N transmitting time slots according to data to be transmitted; then, according to the symbol stream respectively corresponding to each sending time slot, respectively determining the sending symbol vector respectively corresponding to each sending time slot of the N sending time slots; then, according to a precoding codebook, respectively precoding modulation symbol vectors respectively corresponding to each sending time slot to obtain sending symbol vectors respectively corresponding to each sending time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook; then, the transmission symbol vectors respectively corresponding to the transmission time slots may be sequentially transmitted to the signal receiving end in the MIMO transmission system. A signal receiving end firstly obtains receiving symbol vectors respectively corresponding to N sending time slots; the receiving symbol vector corresponding to the tth sending time slot is determined according to the channel response matrix corresponding to the tth sending time slot and the sending symbol vector corresponding to the tth sending time slot sent by the signal sending end; then, according to the received symbol vectors respectively corresponding to the respective transmission time slots, symbol stream detection results respectively corresponding to the respective N transmission time slots can be respectively determined.

It should be noted that, in one implementation manner, in the signal transmission system, the channel correspondence matrix has a size of N_r×N_tThe matrix H, assuming ideal channel estimation, has N transmit antennas_tNumber of receiving antennas N_r. And, the modulation mode can be preset as the number of symbols is 2^mQAM modulation of (1), the QAM modulation symbol set being Q_MThe number of bits carried by each symbol is m. Generally, in 4G and 5G standards, the number of symbols in two paths of I/Q mapping tables adopted by QAM modulation is equal to

PAM modulation, PAM modulation symbol set as

Per PAM modulation symbol bearer

And (4) a bit. Let the number of time slots transmitted by the system be N, and each data stream have

Of individual polar code blocks, per data stream

The code length of each polarized code block is 2N,

the number of data streams of the limited feedback MIMO transmission system based on the polarization transformation is M.

The technical solution of the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

Referring to fig. 2, a signal sending method of a MIMO transmission system based on polarization transformation in an embodiment of the present invention is shown, where the method is applied to a signal sending end in the MIMO transmission system, and includes:

s201: and determining symbol streams respectively corresponding to N sending time slots according to data to be sent, wherein N is a positive integer.

After receiving data to be sent, the signal sending end may determine symbol streams respectively corresponding to each sending time slot according to the data to be sent and the number of the sending time slots. As an example, data to be transmitted may be first converted into binary data, and symbol streams corresponding to N transmission time slots are determined and obtained according to the transmission time slot N.

S202, according to the symbol stream respectively corresponding to each sending time slot, respectively determining the sending symbol vector respectively corresponding to each sending time slot of the N sending time slots.

In this embodiment, after determining the symbol streams respectively corresponding to the respective transmission slots, the transmission symbol vector respectively corresponding to each of the N transmission slots may be respectively determined according to the symbol streams respectively corresponding to the respective transmission slots. It can be understood that, the determination method of the transmission symbol vector corresponding to the tth transmission slot of the N transmission slots is as follows: determining a sending symbol vector corresponding to the ith sending time slot according to a symbol stream corresponding to the tth sending time slot; t is a positive integer and is less than or equal to N.

As an example, the specific implementation manner of determining the transmit symbol vector corresponding to the tth transmit slot according to the symbol stream corresponding to the tth transmit slot may be:

and for the t-th sending time slot, determining the polar code blocks respectively corresponding to all the symbol code blocks in the symbol stream of the t-th sending time slot, and determining the modulation symbol vector corresponding to the t-th sending time slot according to all the polar code blocks corresponding to the t-th sending time slot.

Wherein each transmission time slot corresponds to at least one symbol stream; specifically, as shown in fig. 3, modulation symbol vectors respectively corresponding to each symbol stream of the tth transmission slot may be determined first; wherein, the determination method of the modulation symbol vector corresponding to the ith symbol stream in the tth transmission slot is as follows: for an ith symbol stream, coding according to each symbol code block in the ith symbol stream to obtain a polar code block corresponding to each symbol code block in the ith symbol stream respectively, and determining a modulation symbol vector corresponding to the ith symbol stream according to the polar code block corresponding to each symbol code block in the ith symbol stream respectively; i is a positive integer. Finally, the modulation symbol vectors respectively corresponding to all symbol streams of the tth transmission slot may be used as the modulation symbol vectors corresponding to the tth transmission slot.

It can be understood that, for each of the N transmission slots, the polar code blocks respectively corresponding to the respective symbol code blocks in the symbol stream of each transmission slot may be determined first, and for example, the polar code blocks respectively corresponding to the N transmission slots may be constructed by using a gaussian approximation method. Wherein each transmission slot may comprise at least one symbol stream, one symbol stream comprising

Of individual polar code blocks, per data stream

The code length of each polarized code block is 2N,

next, using the tth transmission slot as an example, how to determine the polar code blocks corresponding to all M symbol streams in the tth transmission slot is described as follows:

(11) for M symbol streams, initializing i ← 1 as the current symbol stream;

(12) for the ith symbol stream

Initializing j ← 1 as the current code block;

(13) let v be the encoding result (polar code block) of the jth code block of the ith symbol stream_i,j＝u_i,jG_2NWherein u is_i,jInformation sequence representing the jth code block in the ith symbol stream, G_2NA polar code encoding matrix with the code length of 2N is represented;

(14) j ← j +1, executing step (13), if

Performing step (15);

(15) i ← i +1, executing step (12), and if i > M, executing step (16);

(16) thus, a polar code block v of all code blocks has been obtained_i,j，1≤i≤M，

Next, a modulation symbol vector corresponding to each transmission slot may be determined according to each polar code block corresponding to each transmission slot. Specifically, for each transmission timeslot, after obtaining each polar code block corresponding to each transmission timeslot, the modulation symbol vector corresponding to each polar code block may be determined according to each polar code block, so that the modulation symbol vectors corresponding to each polar code block may be determinedAnd taking the modulation symbol vectors respectively corresponding to all symbol streams in each sending time slot as the modulation symbol vectors respectively corresponding to each sending time slot. Next, how to determine the modulation symbol vector of the polar code block corresponding to each of the N transmission slots, i.e. the coding vector v of each polar code block corresponding to each transmission slot according to the number of the N transmission slots will be described_i,jTo obtain modulation symbol vectors corresponding to the N transmission slots, as shown in fig. 3, the specific steps are as follows:

(21) for N time slots, initializing t ← 1 as the current sending time slot;

(22) for M symbol streams, initializing i ← 1 as the current symbol stream;

(23) let the modulation symbol vector of the t-th transmission slot be s_t＝[s_t,1,s_t,2,…,s_t,M]The modulation symbol of the t-th transmission slot and the i-th symbol stream is

Wherein

Is s is_t,iThe real part of (a) is,

is s is_t,iAn imaginary part of (d);

(24) according to ith symbol stream

Obtaining a code block of a polarization code

And

in particular to

And

where M (-) denotes a PAM modulation symbol mapping, v_i,j,kA kth element representing a jth code block of an ith symbol stream;

(25) i ← i +1, executing step (23), and if i > M, executing step (26);

(26) t ← t +1, executing step (22), if t > N (27);

(27) to this end, a modulation symbol vector s corresponding to each of all N transmission slots has been obtained_t，1≤t≤N。

S203, precoding the modulation symbol vectors respectively corresponding to each sending time slot according to a precoding codebook to obtain the sending symbol vectors respectively corresponding to each sending time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook.

In this embodiment, the modulation symbol vectors respectively corresponding to each transmission time slot may be precoded according to a precoding codebook, so as to obtain the transmission symbol vectors respectively corresponding to each transmission time slot. For each sending time slot, after the modulation symbol vectors respectively corresponding to each of the polar code blocks corresponding to each sending time slot are obtained, the modulation symbol vectors corresponding to each sending time slot may be precoded according to a precoding codebook, so as to obtain the sending symbol vectors respectively corresponding to each sending time slot. Next, how to determine the modulation symbol vector of the polar code block corresponding to each of the N transmission slots, i.e. the coding vector v of each polar code block corresponding to each transmission slot according to the number of the N transmission slots will be described_i,jAnd obtaining modulation symbol vectors corresponding to the N sending time slots respectively. Specifically, a transmission symbol vector x of the t-th slot of the N transmission slots_t＝Ws_t，1≤t≤N；s_t＝[s_t,1,s_t,2,…,s_t,M]A modulation symbol vector for the t-th transmission slot; w is a precoding codebook.

Wherein the precoding codebook is determined according to a channel response matrix and a precoding selection principle of the MIMO transmission system.

The precoding codebook consists of two parts, i.e., W ═ FU; wherein W is a precoding codebook; f is the same as F and is N_tA capacity maximization precoding matrix of xM, wherein F represents a capacity maximization precoding codebook set; u belongs to a polarization precoding matrix with U being M multiplied by M, and U represents a polarization precoding codebook set; wherein the channel response matrix H has a size N_r×N_tMatrix H, N of_tNumber of transmitting antennas of the signal transmitting terminal, N_rThe number of the receiving antennas at the signal receiving end in the MIMO transmission system.

The precoding codebook selection principle may include a precoding selection principle corresponding to a polarization precoding codebook and a precoding selection principle corresponding to the capacity maximization precoding codebook. In an implementation manner, the precoding selection principle corresponding to the polar precoding codebook is a criterion of maximizing a polarization effect, the polar precoding codebook may be a data stream permutation codebook, and a permutation matrix with a size of M × M has a total of M! One, so the number of codebooks in the polarized precoding codebook set U is M! A plurality of; the precoding selection principle corresponding to the capacity maximization precoding codebook is a minimum norm criterion or a maximum system capacity criterion, and the capacity maximization precoding codebook is a DFT codebook or a Hadamard codebook. It should be noted that, because the polarization precoding matrix U can maximize the difference between the capacities of the data streams without losing the capacity of the MIMO system, the polarization transformation of each data stream of the limited feedback MIMO system is completed. On the basis, a polarization coding mode is adopted in each data stream, the data stream after polarization transformation can be adapted, a limited feedback MIMO transmission method based on polarization transformation is realized, and the performance of an MIMO transmission system is improved.

It should be noted that, when the F matrix adopts the minimum singular value criterion, the minimum singular value criterion is

Wherein λ_min{ HF } denotes the minimum singular value of the matrix HF; when the F matrix adopts the mean square error criterion, the mean square error criterion is

Wherein

Wherein E is_sFor transmitting symbol energy, N₀As a variance of the noise, I_MIs an identity matrix of size M x M,

sub-vectors formed for the i-th through M-th elements of the vector s, i.e.

When the F matrix adopts the capacity selection criterion, the capacity selection criterion is

Wherein

It should be noted that, when the polarized precoding selection criterion is to maximize the capacity difference under the serial detection of the mimo, the polarized precoding matrix

Wherein, I_iThe capacity of the ith antenna in MIMO serial detection is shown, and the ith term of the system capacity chain expansion can also be shown. Next, a derivation process of the polarization precoding matrix U, that is, a determination process of the polarization precoding matrix U, is specifically described:

(41) first determining a signal model as

(42) Let T equal to HW capacity

(43) The system capacity chain type (namely formula a) expansion is carried out on the system capacity, and the method can obtain

(44) Let the matrix formed by the ith to jth columns of the matrix T be T_i:jThen (formula a) can be replaced with

(45) Is provided with

T_i＝T_i:MThen the ith term of the system capacity chain expansion is I_i＝I(s_i；y_i|T_i) And I is_iAlso represents the capacity of the ith antenna under MIMO serial detection; i is_iThe calculation method is as follows:

(46) the polarization precoding selection criterion is to maximize the capacity difference under MIMO serial detection, i.e.

And S204, sequentially sending the sending symbol vectors respectively corresponding to the sending time slots to a signal receiving end in the MIMO transmission system.

After obtaining the sending symbol vectors respectively corresponding to each sending time slot, the sending symbol vectors respectively corresponding to each sending time slot may be sequentially sent to the signal receiving end in the MIMO transmission system according to a preset time interval or a sending time corresponding to each sending time slot. For example, after the transmission symbol vector corresponding to the first transmission slot is transmitted to the signal receiving end, the transmission symbol vector corresponding to the next transmission slot may be transmitted to the signal receiving end every 1s, or when the transmission time corresponding to the tth transmission slot is reached, the transmission symbol vector corresponding to the tth transmission slot may be transmitted to the signal receiving end.

After how the signal sending end of the MIMO transmission system sends signals through the signal sending method of the MIMO transmission system based on polarization transformation provided in the above embodiment, next, how the signal receiving end of the MIMO transmission system demodulates the received signals, so as to obtain the symbol stream detection result of the received signals.

Referring to fig. 4, a signal receiving method of a MIMO transmission system based on polarization transformation in an embodiment of the present invention is shown, where the method is applied to a signal receiving end in the MIMO transmission system, and includes:

s401: and obtaining receiving symbol vectors respectively corresponding to the N sending time slots.

Note that, as shown in fig. 1, the signal transmitting end transmits a symbol vector x for N transmission slots_tTransmission, x_tAfter channel transmission, the receiving symbol vector corresponding to the t-th sending time slot received by the signal receiving end is

Wherein H represents a channel response matrix; w is a precoding matrix; n is_tIs a mean of 0 and a variance of N₀＝2σ²Complex gaussian noise sequence. That is, the received symbol vector corresponding to the tth transmission slot may be determined according to the channel response matrix corresponding to the tth transmission slot and the transmission symbol vector corresponding to the tth transmission slot transmitted by the signal transmitting end; n is a positive integer, t is a positive integer, and t is less than or equal to N.

S402: and respectively determining the symbol stream detection results respectively corresponding to the N sending time slots.

Specifically, the symbol stream detection results corresponding to the N transmission slots may be respectively determined according to the received symbol vectors corresponding to each transmission slot. It should be noted that, since the determination method of the symbol stream detection result of each transmission slot is the same, the t-th transmission slot of the N transmission slots will be taken as an example for illustration. The determination method of the symbol stream detection result corresponding to the tth transmission slot in the N transmission slots may be: and determining a symbol stream detection result corresponding to the tth sending time slot according to the receiving symbol vector corresponding to the tth sending time slot. As an example, the determining a symbol stream detection result corresponding to the tth transmission slot according to the received symbol vector corresponding to the tth transmission slot may include the following steps:

step a: and aiming at the t-th sending time slot, respectively carrying out serial interference elimination detection processing on each symbol stream in the t-th sending time slot according to the receiving symbol vector corresponding to the t-th sending time slot, and obtaining the likelihood probability of the modulation symbol corresponding to each symbol stream.

In one implementation, as shown in fig. 5, maximum likelihood successive cancellation (ML-SIC) detection may be performed on each symbol stream in each transmission slot. Specifically, for the tth transmission slot, the likelihood probabilities of the QAM modulation symbols respectively corresponding to each symbol stream in the tth slot may be determined according to the received symbol vector corresponding to the tth transmission slot. Next, the ith symbol stream in the tth slot is exemplified; specifically, the QAM modulation symbol Q of the ith symbol stream in the tth transmission slot may be calculated from the received symbol vector y of the tth slot, Q ∈ Q_MLikelihood probability P of_t(y_i|s_iQ), wherein

Specifically, each modulation symbol vector in the symbol stream may be determined according to formula (1)

Likelihood probability of (2):

then, each modulation symbol vector is subjected to the following equation (2)

Is traversed to determine the QAM modulation symbols Q for the ith symbol stream in the tth transmit slot, Q ∈ Q_MLikelihood probability P of_t(y_i|s_iQ), i.e.

Next, the likelihood probabilities of the PAM modulation symbols respectively corresponding to each symbol stream in the t-th slot may be determined according to the likelihood probabilities of the QAM modulation symbols respectively corresponding to each symbol stream in the t-th slot. In one implementation, likelihood probabilities of QAM modulated symbols are transformed into PAM modulated symbols

The likelihood probability of (c) may be in the form of:

s can be determined first_t,iLikelihood probability corresponding to real part of

Can be according to formula 3 to QAM modulation symbol

Is traversed to obtain s_t,iLikelihood probability corresponding to real part of

Namely, it is

Next, s can be determined_t,iLikelihood probability corresponding to imaginary part of

The likelihood probability of (3) can be obtained according to formula 4 for QAM modulation symbols

Is traversed to obtain s_t,iLikelihood probability corresponding to imaginary part of

Likelihood probability of (i.e. of

Thus, the likelihood probability of QAM modulation symbol can be converted into PAM modulation symbol

Likelihood probability of (d).

Step b: respectively determining the symbol stream detection results respectively corresponding to the symbol streams;

in this embodiment, the symbol stream detection results respectively corresponding to each symbol stream of each transmission slot may be determined, and since the determination manners of the symbol stream detection results respectively corresponding to each symbol stream of each transmission slot are the same, an ith symbol stream of the tth transmission slot will be taken as an example to be described next. Wherein, the determination method of the symbol stream detection result corresponding to the ith symbol stream in the tth transmission slot is as follows: and for an ith symbol stream, determining a symbol stream detection result corresponding to the ith symbol stream according to the likelihood probability of a modulation symbol corresponding to the ith symbol stream and each polar code block in the ith symbol stream.

Specifically, as shown in fig. 5, for a first polar code block in the i-th symbol stream, according to a likelihood probability of a modulation symbol corresponding to the i-th symbol stream, demodulating the first polar code block in the i-th symbol stream to obtain a log-likelihood ratio vector corresponding to the first polar code block; and decoding the first polarized code block according to the log-likelihood ratio vector corresponding to the first polarized code block to obtain a decoding code word corresponding to the first polarized code block. For each non-first polar code block in the ith symbol stream, demodulating the non-first polar code block according to the likelihood probability of the modulation symbol corresponding to the ith symbol stream and the decoding code word respectively corresponding to each polar code block before the non-first polar code block in the ith symbol stream to obtain a log-likelihood ratio vector corresponding to the non-first polar code block; and decoding the non-first polarized code block according to the log-likelihood ratio vector corresponding to the non-first polarized code block to obtain a decoding code word corresponding to the non-first polarized code block.

Note that the log-likelihood ratio vector corresponding to each of the polar code blocks can be determined by equation (5) and equation (6). Specifically, the decoding code words of the first j-1 polar code blocks according to the ith symbol stream

And likelihood probability of PAM modulation symbol, calculating log likelihood ratio vector of jth code block of ith data stream

Formula (5) is a calculation method of a log-likelihood ratio vector of a jth code block of an ith data stream of a 2t-1 th transmission slot, and formula (6) is a calculation method of a log-likelihood ratio vector of a jth code block of an ith data stream of a 2t-1 th transmission slot:

wherein, beta_i,j,2t-1The calculation process of (2) is as follows:

it should be noted that when the transmitted symbol vector is

When the temperature is higher than the set temperature, then,

wherein, beta_i,j,2tIs calculated by

It should be noted that the transmission symbol vector is

When it is, then

In this embodiment, a method for performing decoding processing on a polar code block according to a log-likelihood ratio vector corresponding to the polar code block to obtain a decoded codeword corresponding to the polar code block may be: firstly, a decoding algorithm corresponding to the polarization codes of SC, SCL and the like can be adopted to obtain a corresponding decoding result

Next, the formula (7) can be utilized

To pair

Re-encoding to obtain decoded code word

After determining the decoding code words respectively corresponding to the respective polar code blocks in the ith symbol stream, the decoding code words respectively corresponding to the respective polar code blocks in the ith symbol stream may be used as the symbol stream detection result corresponding to the ith symbol stream.

Step c: and taking the symbol stream detection result respectively corresponding to all the symbol streams of the tth sending time slot as the symbol stream detection result corresponding to the tth sending time slot.

After determining the symbol stream detection results respectively corresponding to all symbol streams of the tth transmission slot, the symbol stream detection results respectively corresponding to all symbol streams of the tth transmission slot may be used as the symbol stream detection results corresponding to the tth transmission slot. Thus, the symbol stream detection result corresponding to each group of N transmission time slots can be obtained.

As can be seen from the above, in the signal receiving method of the MIMO transmission system based on polarization transformation provided in one or more embodiments of the present disclosure, a signal receiving end in the MIMO transmission system may first obtain received symbol vectors corresponding to N sending time slots respectively; the receiving symbol vector corresponding to the tth sending time slot is determined according to the channel response matrix corresponding to the tth sending time slot and the sending symbol vector corresponding to the tth sending time slot sent by the signal sending end; n is a positive integer, t is a positive integer, and t is less than or equal to N; then, the symbol stream detection results respectively corresponding to the N transmission time slots can be respectively determined; wherein, the determination method of the symbol stream detection result corresponding to the tth sending time slot in the N sending time slots is as follows: and determining a symbol stream detection result corresponding to the tth sending time slot according to the receiving symbol vector corresponding to the tth sending time slot. In this way, in this embodiment, the precoding codebook including the polarization precoding codebook and the capacity maximization precoding codebook may be used to obtain the transmission symbol vectors corresponding to the respective transmission timeslots, so that a scheme of applying the polarization codes to the communication system of the MIMO antenna is implemented, and thus, in the transmission process of the transmission symbol vectors, the error rate is reduced, and thus, the reliable transmission of data and the performance gain of data transmission may be improved.

Corresponding to the signal sending method of the MIMO transmission system based on the polarization transformation, an embodiment of the present invention provides a signal sending apparatus of a polarization coding multiple antenna serial number orthogonal modulation system, and a structure of the signal sending apparatus is shown in fig. 6, and the signal sending apparatus is applied to a signal sending end in the MIMO transmission system, and includes:

a symbol stream determining unit 601, configured to determine, according to data to be sent, symbol streams corresponding to N sending time slots, respectively, where N is a positive integer;

a symbol vector determining unit 602, configured to determine transmission symbol vectors corresponding to the N transmission slots, respectively; wherein, the determination method of the transmission symbol vector corresponding to the tth transmission slot in the N transmission slots is as follows: determining a sending symbol vector corresponding to the tth sending time slot according to a symbol stream corresponding to the tth sending time slot; t is a positive integer, and i is not more than N;

a sending symbol determining unit 603, configured to perform precoding on modulation symbol vectors respectively corresponding to each sending time slot according to a precoding codebook, to obtain sending symbol vectors respectively corresponding to each sending time slot; the precoding codebook comprises a polarization precoding codebook and a capacity maximization precoding codebook;

a signal transmitting unit 604, configured to sequentially transmit the transmission symbol vectors corresponding to the respective transmission slots to a signal receiving end.

Optionally, the symbol vector determining unit 602 is specifically configured to:

Optionally, each transmission slot corresponds to at least one symbol stream; the symbol vector determining unit 602 is specifically configured to:

Corresponding to the above-mentioned signal receiving method for MIMO transmission system based on polarization transformation, an embodiment of the present invention provides a signal receiving apparatus for MIMO transmission system based on polarization transformation, the structure of which is shown in fig. 7, and the signal receiving apparatus is applied to a signal receiving end in the MIMO transmission system, and the signal receiving apparatus includes:

a vector obtaining unit 701, configured to obtain received symbol vectors corresponding to the N sending timeslots, respectively; the receiving symbol vector corresponding to the tth sending time slot is determined according to the channel response matrix corresponding to the tth sending time slot and the sending symbol vector corresponding to the tth sending time slot sent by the signal sending end; n is a positive integer, t is a positive integer, and t is less than or equal to N;

a result determining unit 702, configured to determine symbol stream detection results respectively corresponding to the N sending timeslots respectively; wherein, the determination method of the symbol stream detection result corresponding to the tth sending time slot in the N sending time slots is as follows: and determining a symbol stream detection result corresponding to the tth sending time slot according to the receiving symbol vector corresponding to the tth sending time slot.

Optionally, the result determining unit 702 is specifically configured to:

The technical carrier involved in payment in the embodiments of the present specification may include Near Field Communication (NFC), WIFI, 3G/4G/5G, POS machine card swiping technology, two-dimensional code scanning technology, barcode scanning technology, bluetooth, infrared, Short Message Service (SMS), Multimedia Message (MMS), and the like, for example.

The biometric features related to biometric identification in the embodiments of the present specification may include, for example, eye features, voice prints, fingerprints, palm prints, heart beats, pulse, chromosomes, DNA, human teeth bites, and the like. Wherein the eye pattern may include biological features of the iris, sclera, etc.

It should be noted that the method of one or more embodiments of the present disclosure may be performed by a single device, such as a computer or server. The method of the embodiment can also be applied to a distributed scene and completed by the mutual cooperation of a plurality of devices. In such a distributed scenario, one of the devices may perform only one or more steps of the method of one or more embodiments of the present disclosure, and the devices may interact with each other to complete the method.

The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the modules may be implemented in the same one or more software and/or hardware implementations in implementing one or more embodiments of the present description.

The apparatus of the foregoing embodiment is used to implement the corresponding method in the foregoing embodiment, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.

Fig. 8 is a schematic diagram illustrating a more specific hardware structure of an electronic device according to this embodiment, where the electronic device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 are communicatively coupled to each other within the device via bus 1050.

The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present disclosure.

The Memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory 1020 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called to be executed by the processor 1010.

The input/output interface 1030 is used for connecting an input/output module to input and output information. The i/o module may be configured as a component in a device (not shown) or may be external to the device to provide a corresponding function. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.

The communication interface 1040 is used for connecting a communication module (not shown in the drawings) to implement communication interaction between the present apparatus and other apparatuses. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, Bluetooth and the like).

Bus 1050 includes a path that transfers information between various components of the device, such as processor 1010, memory 1020, input/output interface 1030, and communication interface 1040.

It should be noted that although the above-mentioned device only shows the processor 1010, the memory 1020, the input/output interface 1030, the communication interface 1040 and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.

Computer-readable media of the present embodiments, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.

In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure one or more embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the understanding of one or more embodiments of the present description, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the one or more embodiments of the present description are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that one or more embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.

It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present disclosure are intended to be included within the scope of the present disclosure.

Claims

1. A signal sending method of a MIMO transmission system based on polarization transformation is characterized in that a signal sending end applied to the MIMO transmission system comprises the following steps:

sequentially sending the sending symbol vectors respectively corresponding to the sending time slots to a signal receiving end in the MIMO transmission system;

the determining a transmission symbol vector corresponding to the tth transmission slot according to the symbol stream corresponding to the tth transmission slot includes:

for a tth sending time slot, determining a polar code block corresponding to each symbol code block in a symbol stream of the tth sending time slot, and determining a modulation symbol vector corresponding to the tth sending time slot according to each polar code block corresponding to the tth sending time slot;

each transmission time slot corresponds to at least one symbol stream; the determining the polar code blocks respectively corresponding to each symbol code block in the symbol stream of the tth transmission time slot, and determining the modulation symbol vector corresponding to the tth transmission time slot according to each polar code block corresponding to the tth transmission time slot includes:

2. The method for transmitting signals of the MIMO transmission system based on polarization transformation as claimed in claim 1, wherein the precoding codebook is determined according to a channel response matrix H and a precoding selection principle of the MIMO transmission system; wherein the channel response matrix H has a size N_r×N_tMatrix H, N of_tNumber of transmitting antennas of the signal transmitting terminal, N_rThe number of receiving antennas at a signal receiving end in the MIMO transmission system; the precoding selection principle corresponding to the polarized precoding codebook is a maximum polarization effect criterion, and the polarized precoding codebook is a data stream displacement codebook; the precoding selection principle corresponding to the capacity maximization precoding codebook is a minimum norm criterion or a maximum system capacity criterion, and the capacity maximization precoding codebook is a DFT codebook or a Hadamard codebook.

3. A signal transmitting device of a MIMO transmission system based on polarization transformation is characterized in that, the signal transmitting device is applied to a signal transmitting end in the MIMO transmission system, and comprises:

a symbol vector determining unit, configured to determine the transmission symbol vectors corresponding to the N transmission slots, respectively; wherein, the determination method of the transmission symbol vector corresponding to the tth transmission slot in the N transmission slots is as follows: determining a sending symbol vector corresponding to the tth sending time slot according to a symbol stream corresponding to the tth sending time slot; t is a positive integer and is less than or equal to N; wherein, the determining a transmission symbol vector corresponding to the tth transmission slot according to the symbol stream corresponding to the tth transmission slot includes: for a tth sending time slot, determining a polar code block corresponding to each symbol code block in a symbol stream of the tth sending time slot, and determining a modulation symbol vector corresponding to the ith sending time slot according to each polar code block corresponding to the tth sending time slot; each transmission time slot corresponds to at least one symbol stream; the determining the polar code blocks respectively corresponding to each symbol code block in the symbol stream of the tth transmission time slot, and determining the modulation symbol vector corresponding to the tth transmission time slot according to each polar code block corresponding to the tth transmission time slot includes: determining modulation symbol vectors respectively corresponding to each symbol stream of the tth sending time slot; wherein, the determination method of the modulation symbol vector corresponding to the ith symbol stream in the tth transmission slot is as follows: for an ith symbol stream, coding according to each symbol code block in the ith symbol stream to obtain a polar code block corresponding to each symbol code block in the ith symbol stream respectively, and determining a modulation symbol vector corresponding to the ith symbol stream according to the polar code block corresponding to each symbol code block in the ith symbol stream respectively; i is a positive integer; respectively corresponding modulation symbol vectors of all symbol streams of the tth sending time slot as modulation symbol vectors corresponding to the tth sending time slot;

4. A signal receiving method of a MIMO transmission system based on polarization transformation is characterized in that the signal receiving end applied to the MIMO transmission system comprises the following steps:

respectively determining symbol stream detection results respectively corresponding to the N sending time slots; wherein, the determination method of the symbol stream detection result corresponding to the tth sending time slot in the N sending time slots is as follows: determining a symbol stream detection result corresponding to a tth sending time slot according to a receiving symbol vector corresponding to the tth sending time slot;

the determining a symbol stream detection result corresponding to the tth transmission time slot according to the received symbol vector corresponding to the tth transmission time slot includes:

taking the symbol stream detection results respectively corresponding to all the symbol streams of the tth sending time slot as the symbol stream detection results corresponding to the tth sending time slot;

the determining, for an ith symbol stream, a symbol stream detection result corresponding to the ith symbol stream according to the likelihood probability of the modulation symbol corresponding to the ith symbol stream and each polar code block in the ith symbol stream includes:

5. The signal receiving method of the MIMO transmission system based on polarization transformation according to claim 4, wherein said performing successive interference cancellation detection processing on each symbol stream in the t-th transmission slot according to the received symbol vector corresponding to the t-th transmission slot for the t-th transmission slot to obtain the likelihood probability of the modulation symbol corresponding to each symbol stream comprises:

6. A signal receiving apparatus of a MIMO transmission system based on polarization transformation, which is applied to a signal receiving end in the MIMO transmission system, comprising:

a result determining unit, configured to determine symbol stream detection results respectively corresponding to the N sending timeslots respectively; wherein, the determination method of the symbol stream detection result corresponding to the tth sending time slot in the N sending time slots is as follows: determining a symbol stream detection result corresponding to a tth sending time slot according to a receiving symbol vector corresponding to the tth sending time slot; the determining a symbol stream detection result corresponding to the tth transmission time slot according to the received symbol vector corresponding to the tth transmission time slot includes: for the t-th sending time slot, according to the receiving symbol vector corresponding to the t-th sending time slot, serial interference elimination detection processing is respectively carried out on each symbol stream in the t-th sending time slot, and the likelihood probability of the modulation symbol corresponding to each symbol stream is obtained; respectively determining the symbol stream detection results respectively corresponding to the symbol streams; wherein, the determination method of the symbol stream detection result corresponding to the ith symbol stream in the tth transmission slot is as follows: for an ith symbol stream, determining a symbol stream detection result corresponding to the ith symbol stream according to the likelihood probability of a modulation symbol corresponding to the ith symbol stream and each polar code block in the ith symbol stream; taking the symbol stream detection results respectively corresponding to all the symbol streams of the tth sending time slot as the symbol stream detection results corresponding to the tth sending time slot; the determining, for an ith symbol stream, a symbol stream detection result corresponding to the ith symbol stream according to the likelihood probability of the modulation symbol corresponding to the ith symbol stream and each polar code block in the ith symbol stream includes: for a first polar code block in the ith symbol stream, demodulating the first polar code block in the ith symbol stream according to the likelihood probability of a modulation symbol corresponding to the ith symbol stream to obtain a log-likelihood ratio vector corresponding to the first polar code block; decoding the first polarized code block according to the log-likelihood ratio vector corresponding to the first polarized code block to obtain a decoding code word corresponding to the first polarized code block; for each non-first polar code block in the ith symbol stream, demodulating the non-first polar code block according to the likelihood probability of the modulation symbol corresponding to the ith symbol stream and the decoding code word respectively corresponding to each polar code block before the non-first polar code block in the ith symbol stream to obtain a log-likelihood ratio vector corresponding to the non-first polar code block; decoding the non-first polarized code block according to the log-likelihood ratio vector corresponding to the non-first polarized code block to obtain a decoding code word corresponding to the non-first polarized code block; and taking the decoding code words respectively corresponding to the polarization code blocks in the ith symbol stream as the symbol stream detection results corresponding to the ith symbol stream.