WO2018119896A1

WO2018119896A1 - Encoding method and device

Info

Publication number: WO2018119896A1
Application number: PCT/CN2016/113075
Authority: WO
Inventors: 马骏; 陈一; 李昆
Original assignee: 华为技术有限公司
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2018-07-05
Also published as: CN109565754B; CN109565754A

Abstract

Disclosed in the present application is an encoding method for a multiple-input-multiple-output (MIMO) system. The MIMO system is an N×M MIMO system, and the method comprises: performing channel estimation on received signals, wherein the signals comprise k target signals and k × (k-1) interference signals, and k is min(N, M); acquiring, according to the channel estimation of the signals, estimated phases of the interference signals; acquiring, according to the estimated phases of the interference signals, a coupled power ratio of the interference signals; acquiring, according to the coupled power ratio of the interference signals, a coupled power ratio of the target signals; and feeding the coupled power ratio of the target signals and the coupled power ratio of the interference signals back to a coupling encoder. The present invention enables an MIMO system to employ a fixed antenna spacing to adapt to different transmission distances, thus solving the problem in which a transmission volume is influenced by the transmission distance.

Description

Coding method and device

Technical field

The present application relates to the field of communications technologies, and in particular, to an encoding method and apparatus for a multiple input multiple output MIMO system.

Background technique

As is well known, a multiple input multiple output (MIMO) transmission system in a wireless transmission system refers to a multiple transmission and reception transmission system in which both a transmitter and a receiver have multiple antennas. The wireless MIMO system is mainly used for the same-frequency multiplex transmission to improve the transmission capacity. Under the premise of the same signal bandwidth and signal-to-noise ratio, the maximum transmission capacity of the wireless MIMO of the N transmit antennas and the N receive antennas can reach only one transmit antenna. It is N times the transmission capacity of a wireless single-input single-output (SISO) transmission system composed of one receiving antenna.

In a MIMO system (referred to as an N×M MIMO system) composed of a transmitter having N transmit antennas and a receiver having M receive antennas, the transmission capacity is composed of N transmit antennas or adjacent antennas among M receive antennas The spacing d is determined. Taking the 2×2 MIMO system shown in FIG. 1 as an example, if the transmission capacity of the 2×2 MIMO system is to be twice the transmission capacity of the SISO system, the spacing d needs to satisfy:

Where c is the speed of light, f is the carrier frequency, and R is the transmission distance between the transmitting antenna and the receiving antenna. The d that satisfies this formula is called the antenna Rayleigh distance. It can be seen from the above equation that if R changes, the corresponding adjustment interval d is required to maximize the transmission capacity.

However, in a wireless mobile communication MIMO system, it is assumed that the MIMO system includes a base station and a terminal device, and the spacing between adjacent antennas in the base station and the spacing between adjacent antennas in the terminal device are fixed, but the base station and The transmission distance between terminal devices is constantly changing, therefore, It is not possible to keep the spacing of adjacent antennas at all times to satisfy the antenna Rayleigh distance, resulting in a decrease in the transmission capacity of the MIMO system.

Summary of the invention

The present application provides an encoding method for a MIMO system, which solves the problem that the spacing of adjacent antennas cannot be maintained at all times to satisfy the antenna Rayleigh distance, resulting in a decrease in transmission capacity of the MIMO system.

In a first aspect, an encoding method for a MIMO system is provided, the MIMO system comprising N transmit antennas and M receive antennas, comprising: performing channel estimation on the received signal, wherein the signal includes k targets a signal and k×(k−1) interference signals, k is min(N,M); obtaining an estimated phase of the interference signal according to a channel estimation value of the signal; and obtaining an estimated phase according to the interference signal a coupling power ratio of the interference signal, wherein the coupling power ratio is a ratio of a signal power coupled to the second channel to a signal power on the first channel to a total power of the signal on the first channel, the first The channel and the second channel are respectively connected to the first antenna and the second antenna; obtaining a coupling power ratio of the target signal according to a coupling power ratio of the interference signal; coupling power ratio of the target signal and the The coupled power ratio of the interfering signal is fed back to the coupled encoder.

In the embodiment of the present application, the relationship between the antenna spacing and the antenna Rayleigh distance when the transmission capacity is maximum can be changed by changing the coupling power ratio; in the case where the antenna Rayleigh distance changes due to the change of the transmission distance, the antenna spacing does not need to be changed. The transmission capacity of the MIMO system can be maintained.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the coupled power ratio of the interference signal is obtained according to the estimated phase of the interference signal, and specifically includes: estimating an estimated phase according to the interference signal The difference between the phases is expected to obtain the phase change amount of the interference signal, wherein the expected phase is the phase of the interference signal obtained when the transmission efficiency is maximum; the phase change amount according to the interference signal and the interference signal The first phase, the actual phase of the interference signal is obtained, wherein, when the current phase estimation is the first time, the first phase of the interference signal is the expected phase; when the current phase estimation is not the first time, The first phase of the interference signal is an actual phase obtained by the interference signal in the previous phase estimation; and the coupling power of the interference signal is obtained according to the actual phase of the interference signal and the corresponding relationship between the phase and the coupling power ratio. ratio.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the coupling power ratio of the interference signal is obtained according to the estimated phase of the interference signal, and specifically, according to the estimated phase of the interference signal, And a corresponding relationship between the phase and the coupled power ratio, the coupled power ratio change amount of the interference signal is obtained; and the interference signal is obtained according to the coupled power ratio change amount of the interference signal and the first coupled power ratio of the interference signal Coupling power ratio, wherein the first coupling power ratio of the interference signal is 0 when the current coupling power ratio is calculated for the first time; when the current coupling power ratio is not calculated for the first time, the interference signal is The first coupling power ratio is a coupling power ratio obtained by the interference signal at the last calculation.

The above two embodiments are two implementations for obtaining the coupled power ratio of the interference signal by the estimated phase of the interference signal, and the coupling power ratio of the interference signal that maximizes the transmission capacity can be obtained.

In conjunction with the first aspect or the first or second possible implementation of the first aspect, in a third possible implementation of the first aspect, the coupled encoder is located in a transmitter or a receiver.

In conjunction with the first aspect or any one of the first to third possible implementations of the first aspect, in the fourth possible implementation of the first aspect, the target signal is obtained After the coupled power ratio, the method further includes normalizing the coupled power ratio of the target signal and the coupled power ratio of the interference signal, respectively. By normalizing the coupled power ratio and then transmitting it to the coupled encoder in the transmitter and/or receiver, the transmit power can be more evenly balanced, further improving the signal-to-noise ratio.

With reference to the first aspect or any one of the possible implementation manners of the first to fourth possible implementations of the first aspect, in a fifth possible implementation manner of the first aspect, the phase and the coupled power The manner of obtaining the correspondence relationship includes: changing the antenna spacing, setting the coupling power ratio of the signal to 0, wherein the antenna spacing is a transmitting antenna spacing or a receiving antenna spacing; and performing channel estimation on the received signal. Obtaining an estimated phase of the interference signal according to a channel estimation value of the signal; selecting an estimated phase of any interference signal to compare with an expected phase, if an estimated phase of the selected interference signal is not equal to the expected phase, The coupled power ratio of the selected interference signal is adjusted such that the estimated phase of the selected interference signal is the same as the expected phase, and the adjusted coupling power ratio and the selected dry before adjustment The estimated phase of the scrambled signal corresponds to a phase of the interfering signal obtained when the transmission efficiency is maximum.

In a second aspect, an encoding apparatus for a multiple input multiple output MIMO system is provided, the MIMO system comprising N transmit antennas and M receive antennas, including: a channel estimation module, a processing module, and a feedback module, the channel estimation a module, configured to perform channel estimation on the received signal, and obtain an estimated phase of the interference signal according to the channel estimation value of the signal, where the signal includes k target signals and k×(k-1) Interference signal, k is min (N, M); the processing module is configured to obtain a coupling power ratio of the interference signal according to an estimated phase of the interference signal, where the coupling power ratio is on the first channel The signal is coupled to the ratio of the signal power on the second channel to the total power of the signal on the first channel, the first channel and the second channel being respectively connected to the first antenna and the second antenna; Obtaining a coupling power ratio of the target signal according to a coupling power ratio of the interference signal; and the feedback module is configured to compare a coupling power ratio of the target signal with a coupling power of the interference signal Coupled to the encoder.

The encoding apparatus provided by the embodiment of the present application can change the relationship between the antenna spacing and the antenna Rayleigh distance when the transmission capacity is maximum by changing the coupling power ratio; in the case of the antenna Rayleigh distance change caused by the transmission distance change, there is no need to change The antenna spacing can also maintain the transmission capacity of the MIMO system.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the processing module obtains a coupling power ratio of the interference signal according to an estimated phase of the interference signal, specifically: according to the interference signal a difference between the estimated phase and the expected phase, the phase change amount of the interference signal obtained, wherein the expected phase is a phase of the interference signal obtained when the transmission efficiency is maximum; and a phase change amount according to the interference signal a first phase of the interference signal, the actual phase of the interference signal is obtained, wherein, when the current phase estimation is the first time, the first phase of the interference signal is the expected phase; the current phase estimation is not the first The first phase of the interference signal is the actual phase obtained by the interference signal in the previous phase estimation; the interference is obtained according to the actual phase of the interference signal and the correspondence between the phase and the coupling power ratio. The coupled power ratio of the signal.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the processing module obtains a coupling power ratio of the interference signal according to an estimated phase of the interference signal, where Obtaining: a coupling power ratio change amount of the interference signal according to an estimated phase of the interference signal, and a corresponding relationship between a phase and a coupling power ratio; a coupling power ratio change amount according to the interference signal and the interference signal a first coupling power ratio, the coupling power ratio of the interference signal is obtained, wherein, when the current coupling power ratio is calculated as the first time, the first coupling power ratio of the interference signal is 0; When the calculation is not the first time, the first coupling power ratio of the interference signal is the coupling power ratio obtained by the interference signal in the previous calculation.

In conjunction with the second aspect or the first or second possible implementation of the second aspect, in a third possible implementation of the second aspect, the coupled encoder is located in a transmitter or a receiver.

With reference to the second aspect or any one of the first to third possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the processor is The coupling power ratio of the target signal is further used to: normalize the coupling power ratio of the target signal and the coupling power ratio of the interference signal, respectively. By normalizing the coupled power ratio and then transmitting it to the coupled encoder in the transmitter and/or receiver, the transmit power can be more evenly balanced, further improving the signal-to-noise ratio.

With reference to the second aspect or any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the phase and the coupled power The manner of obtaining the correspondence relationship includes: changing the antenna spacing, setting the coupling power ratio of the signal to 0, wherein the antenna spacing is a transmitting antenna spacing or a receiving antenna spacing; and performing channel estimation on the received signal. Obtaining an estimated phase of the interference signal according to a channel estimation value of the signal; selecting an estimated phase of any interference signal to compare with an expected phase, if an estimated phase of the selected interference signal is not equal to the expected phase, The coupled power ratio of the selected interference signal is adjusted such that the estimated phase of the selected interference signal is the same as the expected phase, and the adjusted coupling power ratio is compared with the estimated phase of the selected interference signal before the adjustment. Correspondingly, wherein the expected phase is a phase of the interference signal obtained when the transmission efficiency is maximum.

In a third aspect, a computer readable storage medium is provided, where computer executed instructions are stored, and when the at least one processor of the device executes the computer to execute an instruction, the device performs the first aspect or the first aspect The encoding method provided by any of the possible implementations.

In a fourth aspect, a computer program product is provided, the computer program product comprising computer executable instructions stored in a computer readable storage medium; at least one processor of the device can read the computer from a computer readable storage medium Executing the instructions, the at least one processor executing the computer to execute the instructions causes the apparatus to implement the encoding method provided by the first aspect or any of the possible implementations of the first aspect.

The encoding method provided by the embodiment of the present application can change the relationship between the antenna spacing and the antenna Rayleigh distance when the transmission capacity is maximum by changing the coupling power ratio; in the case of the antenna Rayleigh distance change caused by the transmission distance change, there is no need to change The antenna spacing can also maintain the transmission capacity of the MIMO system.

DRAWINGS

1 is a schematic structural diagram of a 2×2 MIMO system;

2 is a schematic diagram of a wireless mobile communication network to which the solution of the present application can be applied;

FIG. 3 is a flowchart of an encoding method according to an embodiment of the present application;

4 is a schematic structural diagram of a 2×2 MIMO system with a coupled encoder;

5 is a simulation result diagram showing a correspondence relationship between a phase of a signal and a coupling power ratio of the signal;

FIG. 6 is a schematic diagram of an encoding apparatus according to another embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a MIMO system with an encoding apparatus provided by another embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

FIG. 2 shows a wireless mobile communication network 200 to which the solution of the present application can be applied. Network 200 includes an access point (AP) 210 and a plurality of mobile stations 220. AP 210 can include the ability to pass Mobile station 220 establishes uplink connections (dash lines) and/or downlink connections (dashed lines) and any components that provide wireless access, such as base stations, enhanced base stations (eNBs), femtocells, and other wireless enabled devices. Mobile station 220 can include any component capable of establishing a wireless connection with AP 210, such as a User Equipment (UE), as well as terminal devices such as mobile phones and tablets.

In the network shown in FIG. 2, both the AP 210 and the mobile station 220 may have multiple transmit antennas and multiple receive antennas, forming a MIMO system, between multiple transmit antennas (or receive antennas) in the AP 210. The spacing and the spacing between the plurality of receiving antennas (or receiving antennas) in the mobile station 220 are pre-set and are not easily changed, but the location of the mobile station 220 is not fixed and affects the transmission capacity of the MIMO system.

The solution provided by the present application is to change the coupling power ratio of the signal to adapt the change of the transmission distance and maintain the transmission capacity of the MIMO system when the antenna spacing is constant. Specifically, when the coupled power ratio is 0, the first ratio (the ratio of the antenna spacing to the antenna Rayleigh distance) is 1, which can maximize the transmission capacity; when the coupling power ratio is changed, the transmission capacity is maximized. The ratio will also change. By using the above relationship, when the antenna Rayleigh distance changes due to the change of the transmission distance R, by adjusting the coupling power ratio, the first ratio is equal to the antenna spacing and the current antenna Rayleigh distance under the condition that the antenna spacing is constant. The ratio is thus kept to maximize transmission capacity.

The present application provides an encoding method for a MIMO system, where the MIMO system includes N transmit antennas and M receive antennas, and N and M are both positive integers. The coding method is as shown in FIG. 3, and includes:

301. Perform channel estimation on the received signal.

Specifically, the signal includes k target signals and k×(k-1) interference signals, k is min(N,M); the maximum capacity of the N×M MIMO system is equivalent to k times of the SISO transmission system, The multiplexing is only part of the k×k antenna of the MIMO system, and more than k antennas (whether the transmitting antenna or the receiving antenna) are used for diversity. To put it simply, multiplexing is to transmit different data on multiple independent paths, make full use of system resources, and improve system transmission capacity; diversity transmits the same data on multiple independent paths, and the receiving end resists channel fading through diversity combining technology. Improve transmission reliability and reduce bit error rate. The solution of the present application is to increase the transmission capacity of the system, so only the multiplexing portion in the MIMO system is considered. Among them, each transmitting antenna has a corresponding receiving antenna, for example, the first transmitting antenna corresponds to the first receiving antenna, and the first channel includes a channel connected to the first transmitting antenna and a channel connected to the second transmitting antenna, and the signal received from the first channel is For the target signal, the signal from the first channel to the other channel belongs to the interference signal, so the signal includes k target signals and k × (k-1) interference signals.

302. Obtain an estimated phase of the interference signal according to the channel estimation value of the signal.

Further, it is assumed that the channel estimation value is represented by h, and the channel estimation value is a complex number, which can be expressed as -h - ^{xe iθ} , where θ is phase information. Therefore, after obtaining the channel estimation value, the estimated phase of each interference signal in the signal can be obtained according to the above manner.

303. Obtain a coupling power ratio of the interference signal according to the estimated phase of the interference signal.

Specifically, the coupling power ratio is a ratio of a signal power coupled to the second channel to a total power of the signal on the first antenna, and the first channel and the second channel are respectively coupled to the first antenna and the second antenna. Connected, wherein the channel connected to the first transmitting antenna or the first receiving antenna is the first channel, and the channel connected to the second transmitting antenna or the second receiving antenna is the second channel. Taking a coupled encoder in a 2×2 MIMO system as an example, as shown in FIG. 4, the coupled encoder 400 of the transmitter couples a part of the signals of the first channel by the beam splitter 401 according to the power ratio η, and then reverses the phase. The combiner 402 and the combiner 403 superimpose the coupled signal (phase rotation 180 degrees) onto the second transmission channel, and couple a part of the signal of the second channel to the power transmission ratio η to be inversely superimposed on the first transmission channel. The same operation is performed on the coupled encoder in the receiver, and details are not described herein again.

Optionally, according to the estimated phase of the interference signal, the coupled power ratio of the interference signal is obtained, and the following two methods may be used:

(1) Obtaining a phase change amount of the interference signal according to a difference between the estimated phase and the expected phase of the interference signal, wherein the expected phase is a phase of the interference signal obtained when the transmission efficiency is maximum; optionally, the expected phase is 0.5. π. Obtaining the actual phase of the interference signal according to the phase change amount of the interference signal and the first phase of the interference signal, wherein, when the current phase estimation is the first time, the first phase of the interference signal is the expected phase; the current phase estimation is not the first In the second time, the first phase of the interference signal is the actual phase obtained by the interference signal in the previous phase estimation; wherein the phase change amount of the interference signal can be understood as the actual phase of the interference signal in the current calculation. A change based on a phase. According to the actual phase of the interference signal, as well as the phase and The corresponding relationship of the coupled power ratios gives the coupled power ratio of the interfering signals.

Specifically, assuming that the first phase of the interference signal is 0.15π, the estimated phase of the interference signal is 0.6π, and the expected phase is 0.5π, the phase change amount of the interference signal is 0.1π; After the last adjustment of the coupling amplitude ratio, the phase of the interference signal has been adjusted to 0.5π, and the actual phase corresponding to the interference signal is increased by 0.1π in this calculation, so the actual phase is 0.25π. The correspondence between the phase and the coupled power ratio is as shown in FIG. 5, and the coupling power ratio of the interference signal can be obtained to be about 0.35.

It should be noted that if the estimated phase of the interference signal is smaller than the expected phase, the actual phase of the interference signal is reduced, and the estimated phase of the first phase of the interference signal needs to be subtracted to calculate the interference signal. Actual phase.

Optionally, the correspondence between the phase and the coupled power ratio is obtained as follows:

Changing the antenna spacing, setting the coupling power ratio of the signal to 0, wherein the antenna spacing is the transmitting antenna spacing or the receiving antenna spacing; receiving the signal, performing channel estimation on the signal, and obtaining the interference signal according to the channel estimation value of the signal. Estimating the phase; selecting an estimated phase of any of the interference signals to compare with the expected phase, and if the estimated phase of the selected interference signal is not equal to the expected phase, adjusting the coupled power ratio of the selected interference signal to make the selected interference signal The estimated phase is the same as the expected phase, and the adjusted coupling power ratio corresponds to the estimated phase of the selected interference signal before the adjustment, wherein the expected phase is the phase of the interference signal obtained when the transmission efficiency is maximum.

It should be understood that when calculating the correspondence between the phase and the coupled power ratio, both the transmitter and the receiver in the MIMO system may have a coupled encoder, and the transmitter and the receiver may also have a coupled encoder, FIG. 5 is The transmitter and the receiver are obtained in the presence of a coupled encoder.

Alternatively, a 2×2 MIMO system can be used to calculate the correspondence between the phase and the coupled power ratio, which is the simplest MIMO system in which only two interfering signals exist in the received signal, and the first channel is opposite to the second channel. The interference signal and the interference signal of the second channel to the first channel, when the coupling power ratio is the same, the estimated phase of the interference signal between the two channels is the same, and an interference signal is selected for comparison, and the interference signal is obtained. After the relationship between the estimated phase and the coupled power ratio, the coupling power ratio is changed to 0, the antenna spacing is changed, and then an interference is selected. The signals are compared, wherein the first channel includes a channel connected to the first transmitting antenna and a channel connected to the first receiving antenna, and the second channel includes a channel connected to the second transmitting antenna and a channel connected to the second receiving antenna.

Further, a larger-scale MIMO system can also be used, and the interference signal in the received signal will increase. For example, in a 3×3 MIMO system, there are six interfering signals in the received signal, that is, three channels. Interference signals between each other, in the case of the same coupling power ratio, the estimated phase of the interference signal between each two channels is the same, so there are three different estimated phases; in this case, one of the interference signal estimates needs to be selected. The phase adjusts the coupled power ratio of the interfering signal compared to the expected phase such that the estimated phase of the interfering signal is the same as the expected phase. Then, the coupling power ratio is changed to 0, and another interference signal having a different estimated phase from the previously selected interference signal is selected for comparison or the antenna spacing is changed, and then an interference having a different estimated phase from the previously selected interference signal is selected. The signals are compared.

(2) According to the estimated phase of the interference signal and the corresponding relationship between the phase and the coupling power ratio, the coupling power ratio variation of the interference signal is obtained; according to the coupling power ratio variation of the interference signal and the first coupling power ratio of the interference signal, The coupling power ratio of the interference signal, wherein, when the current coupling power ratio is calculated for the first time, the first coupling power ratio of the interference signal is 0; when the current coupling power ratio is not calculated for the first time, the interference signal is first The coupled power ratio is the coupled power ratio obtained by the interference signal at the last calculation. Specifically, the amount of change in the coupling power ratio of the interference signal can be understood as a change based on the first coupling power ratio of the interference signal.

For example, if the first phase of the interference signal is still assumed to be 0.15π, the estimated phase of the interference signal is 0.6π, and the expected phase is 0.5π, according to FIG. 5, the coupling power ratio of the interference signal is changed by about 0.15. The first coupling power ratio of the interference signal is about 0.5. Since the estimated phase and the first phase are on both sides of the expected phase, the difference between the two is taken as an absolute value, that is, -0.5-0.15-=0.35.

It should be noted that if the estimated phase and the first phase of the interference signal are both greater than or less than the expected phase, the coupling power ratio of the interference signal is added to the first coupling power ratio of the interference signal.

In the above two schemes for calculating the coupled power ratio, the scheme (1) first determines the current actual phase, and calculates the coupled power ratio according to the actual phase, so that the coupled power ratio can be accurately obtained; Case (2) is the relationship between the phase and the coupled power ratio obtained by the simulation, that is, Figure 5, which is similar to the linear relationship, so the phase change can be directly mapped to the change of the coupled power ratio, and the current application should be adopted. Coupling power ratio.

304. Obtain a coupling power ratio of the target signal according to a coupling power ratio of the interference signal.

Specifically, assuming that the signal in the first channel is a target signal, and the first channel includes a portion of the transmitter connected to the first transmitting antenna and a portion of the receiver connected to the first receiving antenna, a coupling power ratio of the target signal η _nm can be calculated by the following formula:

or

Where η _ni represents the coupling power ratio of the signal on the nth channel to the i-th channel, and η _in represents the coupling power ratio of the signal on the i-th channel coupled to the n-th channel, where n, m, and i are both greater than zero. A positive integer.

It should be understood that since the interference is reciprocal, the energy of the signals transmitted on each channel is similar, and the channel conditions are also the same. In the case where the initial coupling power ratios are the same, the mutual interference between any two channels can be It is considered to be the same, so the values of η _ni and η _in are the same; therefore, based on the coupling power ratio from those interfering signals from the same channel as the target signal or those interfering signals that interfere with the channel in which the target signal is located The coupling power ratio of the target signal can be obtained.

Optionally, after step 304, the method further comprises: normalizing the coupled power ratio of the target signal and the coupled power ratio of the interference signal, respectively. By normalizing the coupled power ratio and then transmitting it to the coupled encoder in the transmitter and/or receiver, the transmit power can be more evenly balanced, further improving the signal-to-noise ratio.

305. Feed the coupled power ratio of the target signal and the coupled power ratio of the interference signal to the coupled encoder.

Specifically, taking the coupled encoder in the 3×3 MIMO system as an example, assuming that the input signals of the coupled encoder are x1, x2, and x3, respectively, and the output signals are y1, y2, and y3, respectively, the coupled encoder receives the target signal. After the coupling power ratio and the coupling power ratio of the interference signal, the output signal y1=x1×η ₁₁ +x2×η ₂₁ +x3×η ₃₁ , y2=x1×η ₁₂ +x2×η ₂₂ +x3×η ₃₂ , y3= X1 × η ₁₃ + x 2 × η ₂₃ + x 3 × η ₃₃ , wherein η ₁₁ , η ₂₂ , η ₃₃ are the coupling power ratio of the target signal, and η ₂₁ is the coupling power ratio of the second channel coupled to the first channel, η ₃₁ is the coupled power ratio of the third channel coupled to the first channel, and so on.

Optionally, the coupled encoder may be present in the transmitter; the coupled encoder may also be present in the receiver; the coupled encoder may also be present in both the transmitter and the receiver, as shown in FIG. The functions of the above three cases are the same, the only difference is that the third case is smaller than the first two cases, when the same phase change amount is faced, the coupling power ratio is changed less.

Another embodiment of the present application provides an encoding apparatus 600 for a MIMO system, where the MIMO system includes N transmitting antennas and M receiving antennas, N and M are both positive integers, and the encoding apparatus 600 is as shown in FIG. The method includes: a channel estimation module 601, a processing module 602, and a feedback module 603,

The channel estimation module 601 is configured to perform channel estimation on the received signal, and obtain an estimated phase of the interference signal according to the channel estimation value of the signal.

Wherein, the signal comprises k target signals and k×(k-1) interference signals, and k is min(N, M). The problem of the number of the target signal and the interference signal included in the signal has been described in the foregoing method embodiments, and details are not described herein again. In addition, the channel estimation value is a complex number. Assuming that the complex number h is used to represent the channel estimation value, the complex number h can be expressed as -h - ^{xe iθ} , where θ is phase information. Therefore, after obtaining the channel estimation value, the estimated phase of each interference signal in the signal can be obtained according to the above manner.

The processing module 602 is configured to obtain a coupling power ratio of the interference signal according to the estimated phase of the interference signal, where the coupling power ratio is that the signal on the first channel is coupled to the signal power on the second channel to account for the total signal on the first channel. a ratio of power, the first channel and the second channel are respectively connected to the first antenna and the second antenna; and is further configured to obtain a target signal according to a coupling power ratio of the first interference signal of the k×(k-1) interference signals The coupled power ratio, wherein the first interference signal and the target signal are from the same channel, forming interference to other channels.

Specifically, the first channel includes a channel connected to the first transmitting antenna and a channel connected to the first receiving antenna, and the second channel includes a channel connected to the second transmitting antenna and a channel connected to the second receiving antenna.

Further, the processing module 602 obtains the coupling power ratio of the interference signal according to the estimated phase of the interference signal in two ways:

(1) Obtaining an interference signal based on the difference between the estimated phase and the expected phase of the interference signal The phase change amount of the number, wherein the expected phase is the phase of the interference signal obtained when the transmission efficiency is maximum; alternatively, the expected phase is 0.5π. Obtaining the actual phase of the interference signal according to the phase change amount of the interference signal and the first phase of the interference signal, wherein, when the current phase estimation is the first time, the first phase of the interference signal is the expected phase; the current phase estimation is not the first In the second time, the first phase of the interference signal is the actual phase obtained by the interference signal in the previous phase estimation; wherein the phase change amount of the interference signal can be understood as the actual phase of the interference signal in the current calculation. A change based on a phase. The coupling power ratio of the interference signal is obtained according to the actual phase of the interference signal and the correspondence between the phase and the coupling power ratio.

It should be understood that in calculating the correspondence between the phase and the coupled power ratio, both the transmitter and the receiver in the MIMO system employed may have a coupled encoder, and the transmitter and the receiver may also have a coupled encoder.

Optionally, after obtaining the coupled power ratio of the target signal, the processor 602 is further configured to normalize the coupled power ratio of the target signal and the coupled power ratio of the interference signal, respectively. Coupling work After the ratio is normalized, it is sent to the coupled encoder in the transmitter and/or receiver to make the transmit power more balanced and further improve the signal-to-noise ratio.

The feedback module 603 is configured to feed back the coupled power ratio of the target signal and the coupled power ratio of the interference signal to the coupled encoder.

Alternatively, the coupled encoder may be located in the transmitter or in the receiver; in addition, the transmitter and the receiver may have a coupled encoder at the same time, as shown in FIG. The functions of the above three cases are the same, the only difference is that the third case is smaller than the first two cases, when the same phase change amount is faced, the coupling power ratio is changed less.

Another embodiment of the present application provides an encoding apparatus 700, including a receiver 701, a processor 702 and a transmitter 703; a receiver 701 for receiving signals; a processor 702 for performing steps 301-304; and a transmitter 703 for Go to step 305. Specifically, a schematic structural diagram of a MIMO system with an encoding device 700 is shown in FIG. 7.

In addition, according to the estimated phase of the interference signal, the manner of obtaining the coupling power ratio of the interference signal, and the manner of obtaining the target signal coupling power ratio according to the coupling power ratio of the interference signal are all described in detail in the previous embodiment, the present application The embodiments are not described herein again.

Another embodiment of the present application provides a computer readable storage medium, where computer execution instructions are stored, and when at least one processor of the device executes the computer to execute an instruction, the device executes the encoding method shown in FIG. .

Another embodiment of the present application provides a computer program product comprising computer executed instructions stored in a computer readable storage medium; at least one processor of the device can be read from a computer readable storage medium The computer executes instructions that the at least one processor executes to cause the device to perform the encoding method illustrated in FIG.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

An encoding method for a multiple-input multiple-output MIMO system, where the MIMO system includes N transmit antennas and M receive antennas, including:

Performing channel estimation on the received signal, wherein the signal includes k target signals and k×(k-1) interference signals, k is min(N, M);

Obtaining an estimated phase of the interference signal according to a channel estimation value of the signal;

Obtaining a coupling power ratio of the interference signal according to an estimated phase of the interference signal, wherein the coupling power ratio is that a signal on the first channel is coupled to a signal power on the second channel to occupy the first channel a ratio of a total power of the signal, wherein the first channel and the second channel are respectively connected to the first antenna and the second antenna;

Obtaining a coupling power ratio of the target signal according to a coupling power ratio of the interference signal;

A coupling power ratio of the target signal and a coupling power ratio of the interference signal are fed back to the coupled encoder.
The method according to claim 1, wherein the coupling power ratio of the interference signal is obtained according to the estimated phase of the interference signal, and specifically includes:

Obtaining a phase change amount of the interference signal according to a difference between an estimated phase and an expected phase of the interference signal, wherein the expected phase is a phase of an interference signal obtained when a transmission efficiency is maximum;

Obtaining an actual phase of the interference signal according to a phase change amount of the interference signal and a first phase of the interference signal, wherein, when the current phase estimation is the first time, the first phase of the interference signal is the Expected phase; when the current phase estimation is not the first time, the first phase of the interference signal is the actual phase obtained by the interference signal in the previous phase estimation;

The coupling power ratio of the interference signal is obtained according to the actual phase of the interference signal and the corresponding relationship between the phase and the coupling power ratio.
The method according to claim 1, wherein the coupling power ratio of the interference signal is obtained according to the estimated phase of the interference signal, and specifically includes:

Obtaining a coupling power ratio change amount of the interference signal according to an estimated phase of the interference signal and a correspondence relationship between a phase and a coupling power ratio;

a coupling power ratio change according to the interference signal and a first coupling power of the interference signal Rate ratio, the coupling power ratio of the interference signal is obtained, wherein, when the calculation of the current coupling power ratio is the first time, the first coupling power ratio of the interference signal is 0; the calculation of the current coupling power ratio is not the first The second coupling power ratio of the interference signal is the coupling power ratio obtained by the interference signal in the previous calculation.
Method according to any of the claims 1 to 3, characterized in that the coupled encoder is located in a transmitter or receiver.
The method according to any one of claims 1 to 4, wherein after the coupling power ratio of the target signal is obtained, the method further comprises:

The coupling power ratio of the target signal and the coupling power ratio of the interference signal are respectively normalized.
The method according to claim 2 or 3, wherein the obtaining the correspondence between the phase and the coupling power ratio comprises:

Changing the antenna spacing, setting a coupling power ratio of the signal to 0, wherein the antenna spacing is a transmitting antenna spacing or a receiving antenna spacing;

Performing channel estimation on the received signal, and obtaining an estimated phase of the interference signal according to a channel estimation value of the signal;

Selecting an estimated phase of any one of the interference signals to be compared with an expected phase, and if the estimated phase of the selected interference signal is not equal to the expected phase, adjusting a coupled power ratio of the selected interference signal to cause the selected interference signal The estimated phase is the same as the expected phase, and the adjusted coupling power ratio corresponds to the estimated phase of the selected interference signal before the adjustment, wherein the expected phase is the phase of the interference signal obtained when the transmission efficiency is maximum .
An encoding apparatus for a multiple-input multiple-output MIMO system, where the MIMO system includes N transmit antennas and M receive antennas, including: a channel estimation module, a processing module, and a feedback module,

The channel estimation module is configured to perform channel estimation on the received signal, and obtain an estimated phase of the interference signal according to the channel estimation value of the signal, where the signal includes k target signals and k×(k-1) The interference signal, k is min(N, M);

The processing module is configured to obtain a coupling power ratio of the interference signal according to an estimated phase of the interference signal, where the coupling power ratio is coupled to a signal on a first channel to a second a signal power on the channel occupies a ratio of a total power of the signal on the first channel, the first channel and the second channel being respectively connected to the first antenna and the second antenna; and further configured to be used according to the interference signal Coupling the power ratio to obtain a coupling power ratio of the target signal;

The feedback module is configured to feed back a coupling power ratio of the target signal and a coupling power ratio of the interference signal to a coupled encoder.
The apparatus according to claim 7, wherein the processing module obtains a coupling power ratio of the interference signal according to an estimated phase of the interference signal, specifically:

Obtaining a phase change amount of the interference signal according to a difference between an estimated phase and an expected phase of the interference signal, wherein the expected phase is a phase of an interference signal obtained when a transmission efficiency is maximum;

Obtaining an actual phase of the interference signal according to a phase change amount of the interference signal and a first phase of the interference signal, wherein, when the current phase estimation is the first time, the first phase of the interference signal is the Expected phase; when the current phase estimation is not the first time, the first phase of the interference signal is the actual phase obtained by the interference signal in the previous phase estimation;

The coupling power ratio of the interference signal is obtained according to the actual phase of the interference signal and the corresponding relationship between the phase and the coupling power ratio.
The apparatus according to claim 7, wherein the processing module obtains a coupling power ratio of the interference signal according to an estimated phase of the interference signal, specifically:

Obtaining a coupling power ratio change amount of the interference signal according to an estimated phase of the interference signal and a correspondence relationship between a phase and a coupling power ratio;

Obtaining a coupling power ratio of the interference signal according to a coupling power ratio change amount of the interference signal and a first coupling power ratio of the interference signal, where the interference is calculated when the current coupling power ratio is calculated for the first time The first coupling power ratio of the signal is 0; when the current coupling power ratio is not calculated for the first time, the first coupling power ratio of the interference signal is the coupling power ratio obtained by the interference signal in the previous calculation.
Apparatus according to any one of claims 7 to 9, wherein the coupled encoder is located in a transmitter or receiver.
The apparatus according to any one of claims 7 to 10, wherein the processor is further configured to: after obtaining a coupling power ratio of the target signal:

The coupling power ratio of the target signal and the coupling power ratio of the interference signal are respectively normalized.
The device according to claim 8 or 9, wherein the manner of obtaining the correspondence between the phase and the coupling power ratio comprises:

Changing the antenna spacing, setting a coupling power ratio of the signal to 0, wherein the antenna spacing is a transmitting antenna spacing or a receiving antenna spacing;

Performing channel estimation on the received signal, and obtaining an estimated phase of the interference signal according to a channel estimation value of the signal;

Selecting an estimated phase of any one of the interference signals to be compared with an expected phase, and if the estimated phase of the selected interference signal is not equal to the expected phase, adjusting a coupled power ratio of the selected interference signal to cause the selected interference signal The estimated phase is the same as the expected phase, and the adjusted coupling power ratio corresponds to the estimated phase of the selected interference signal before the adjustment, wherein the expected phase is the phase of the interference signal obtained when the transmission efficiency is maximum .