WO2011147333A1

WO2011147333A1 - Precoding processing method, precoding processing device and base station

Info

Publication number: WO2011147333A1
Application number: PCT/CN2011/075207
Authority: WO
Inventors: 阮亮中; 刘坚能; 杜颖钢; 刘晟
Original assignee: 华为技术有限公司
Priority date: 2010-10-29
Filing date: 2011-06-02
Publication date: 2011-12-01
Also published as: CN102457360B; CN102457360A

Abstract

A precoding processing method, precoding processing device and base station are disclosed in the present invention, wherein the precoding processing method includes: acquiring the correlation parameters of spatial channels of the communication system where the base station locates, and acquiring interference avoidance parameters according to the correlation parameters of the spatial channels (101); acquiring element values of the fixed elements of a precoding matrix to be constructed according to the interference avoidance parameters (102); acquiring the element values of other elements except the fixed elements of the precoding matrix to be constructed according to an algorithm of interference alignment (103); constructing the precoding matrix according to the acquired element values of the fixed elements of the precoding matrix to be constructed and the element values of other elements except the fixed elements in the precoding matrix to be constructed; precoding data streams by the precoding matrix (104). The precoding processing method, precoding processing device and base station provided in the present invention enables to suppress the interference effectively.

Description

Precoding processing method, precoding processing device and base station The present application is filed on October 29, 2010, the Chinese Patent Office, the application number is 201010530342. 6 , and the invention name is "precoding processing method, precoding processing device and base station" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The embodiments of the present invention relate to a multiple input multiple output technology, and in particular, to a precoding processing method, a precoding processing apparatus, and a base station, and belong to the field of communication technologies. Background technique

In the field of wireless communication technology, the interference problem between signals is a key bottleneck affecting its development. At present, it is impossible to completely solve the interference problem between signals through technical means, for example, the capacity problem of two-user Gaussian interference signals has not been solved.

At present, an idea to solve the interference problem is to share the channel information between the signal transmitters instead of sharing the data to be transmitted, and then use the Interference Alignment (IA) method to automatically The interference from the transmitter is summed to the signal space that the corresponding receiver can handle, thereby achieving interference cancellation. The existing interference alignment method assumes an arbitrary Gaussian symbol, the interference is random, and the interference space can be regarded as unstructured. The interference alignment is to align the desired interference to a space of a smaller dimension, and utilize the remaining "clean" "Dimensions to transmit useful signals. An important assumption of the interference alignment method is that when the transmitter has multiple transmit antennas, the corresponding channels of each antenna are independently and equally distributed.

However, in an actual wireless communication system, channels corresponding to antennas of the same transmitter have a certain correlation.消除 Eliminate interference by the above interference alignment, and it can not achieve the purpose of effectively reducing interference and increasing transmission rate. Summary of the invention

The embodiments of the present invention provide a precoding processing method, a precoding processing apparatus, and a base station, which can effectively reduce interference and improve a transmission rate. The present invention provides a precoding processing method, including:

Obtaining a spatial channel correlation parameter of the communication system where the base station is located, and acquiring an interference avoidance parameter according to the spatial channel correlation parameter;

Obtaining an element value of a fixed element of the precoding matrix to be constructed according to the interference avoidance parameter;

Obtaining element values of other elements except the fixed element in the precoding matrix to be constructed according to the interference alignment algorithm;

Constructing a precoding matrix according to the obtained element value of the precoding matrix fixed element to be constructed and element values of other elements in the precoding matrix to be constructed except the fixed element;

The data stream is precoded according to the precoding matrix.

The present invention also provides a precoding processing apparatus, including:

a parameter obtaining module, configured to acquire a spatial channel correlation parameter of a communication system where the base station is located, and obtain an interference avoidance parameter according to the spatial channel correlation parameter;

a first calculating module, configured to acquire an element value of a fixed element of the precoding matrix to be constructed according to the interference avoidance parameter;

a second calculating module, configured to obtain, according to the interference alignment algorithm, an element value of other elements except the fixed element in the precoding matrix to be constructed;

a building block, configured to construct a precoding matrix according to the obtained element value of the precoding matrix fixed element to be constructed and the element value of the element other than the fixed element in the precoding matrix to be constructed;

And an encoding processing module, configured to perform precoding processing on the data stream according to the precoding matrix. The present invention also provides a base station including the above-described precoding processing apparatus.

The precoding processing method, the precoding processing device, and the base station provided by the embodiments of the present invention Obtaining the spatial channel correlation parameter of the communication system where the base station is located, and further obtaining the interference avoidance parameter, calculating the element value of the fixed element of the precoding matrix, and performing interference avoidance; and then calculating and acquiring other elements in the precoding matrix according to the interference The element value is pre-coded by using the pre-encoding matrix obtained above, and the interference avoidance and interference alignment are extracted, which can effectively suppress the interference. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic flowchart of Embodiment 1 of a precoding processing method according to the present invention;

2A is a schematic diagram of interference alignment;

2B is a schematic diagram of interference avoidance;

2C is a schematic diagram of interference avoidance coordination interference alignment;

3 is a schematic flowchart of Embodiment 2 of a precoding processing method according to the present invention;

4 is a schematic flowchart of Embodiment 3 of a precoding processing method according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 1 of a precoding processing apparatus according to the present invention; FIG.

FIG. 6 is a schematic structural diagram of Embodiment 2 of a precoding processing apparatus according to the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. The present invention provides a precoding processing method. FIG. 1 is a schematic flowchart of Embodiment 1 of a precoding processing method according to the present invention. As shown in FIG. 1, the method includes the following steps:

Step 101: Obtain a spatial channel correlation parameter of a communication system where the base station is located, and obtain an interference avoidance parameter according to the spatial channel correlation parameter. In this step, in a communication system having multiple base stations and multiple transmit antennas, each transmission is considered. The channel correlation between the antennas, wherein the spatial channel correlation parameter refers to a parameter of an effective virtual angle class, and the change in the communication system is relatively slow;

Step 102: Acquire an element value of a fixed element of a precoding matrix to be constructed according to the interference avoidance parameter. In this step, based on the foregoing steps, perform interference avoidance calculation according to the interference avoidance parameter to obtain precoding. The data of the fixed element part of the matrix, that is, the base station service user set, the effective virtual transmission angle position set corresponding to the base station, the effective transmit signal position set corresponding to the base station, and the avoidance user set may be considered, and the calculation is performed according to the principle of interference avoidance;

Step 103: Obtain an element value of the element other than the fixed element in the precoding matrix to be constructed according to the interference alignment algorithm. On the basis of the interference avoidance calculation described above, further use the principle of interference alignment to align the interference signal to the user. The interference space that can be processed obtains the element values of the elements other than the above fixed elements in the precoding matrix, so that the precoding matrix obtained in the method considers two factors of interference avoidance and interference alignment;

Step 104: Construct a precoding matrix according to the obtained element value of the fixed element and element values of other elements except the fixed element, and further perform precoding processing on the data stream according to the precoding matrix.

The precoding processing method provided by the foregoing embodiment of the present invention obtains the spatial channel correlation parameter of the communication system where the base station is located, and further acquires the interference avoidance parameter, to calculate the element value of the fixed element of the precoding matrix, and performs interference avoidance; The element values of other elements in the precoding matrix are calculated according to the interference, and the precoding of the data stream by using the precoding matrix obtained above can suppress the interference. In a specific implementation process, the interference avoidance parameter in the foregoing embodiment of the present invention may specifically include a base station service user set, an effective virtual transmission angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, and a evasive user set. It may also include some other interference avoidance parameters, for example, considering the change before and after. The interference avoidance set at this time may further include a change set of the effective virtual transmission angle position corresponding to the base station, and the base station, based on the foregoing four parameters. A set of changes in the position of the corresponding effective transmitted signal, and the like.

In addition, the spatial channel correlation parameter in the foregoing embodiment is relatively fixed. Therefore, the interference avoidance parameter can be obtained in an offline manner according to the spatial channel correlation parameter, and stored in the storage module, where the precoding matrix is obtained according to the interference avoidance parameter. The element value of the fixed element may be an interference avoidance parameter obtained from the storage module; or may be calculated in real time according to the performance coefficient of the communication system to obtain the interference avoidance parameter of the communication system where the base station is located.

In another embodiment, after the element values of the fixed elements in the precoding matrix are obtained according to the interference avoidance parameter, the user of the evasive user group may be further obtained for the data receiving end to receive the data. An equalizer for performing interference cancellation according to the stream; and after acquiring the element values of the elements other than the fixed elements in the precoding matrix according to the interference alignment algorithm, further obtaining the corresponding users of the communication system in the base station where the base station is located, except for the users in the centralized user group The equalizer for causing the data receiving end to perform interference cancellation on the received data stream may specifically calculate the equalizer of the other user by using the minimum interference leakage criterion, and may further include sending the acquired equalizer to The step corresponding to the user's user device. The use of the above equalizer can take into account the processing of the data receiving end. In the cyclic process (especially in the interference alignment process), the data transmitting end can iteratively update the equalizer and the precoder with each other; for the determined equalization vector, after the quantization The data receiving end is notified, and the data receiving end can perform interference cancellation processing on the received data stream according to the equalizer. In the above embodiment, the spatial correlation of the channel matrix is considered, and the pre-coding matrix is obtained by using the interference avoidance and the interference alignment method. On the basis of the above, the pre-coding may be further performed according to the zero-forcing algorithm and/or the minimum mean square error algorithm. The element values of the elements in the matrix are corrected. The technical solution of the present invention will be described below in a specific embodiment. In a wireless communication system, the environment in which the user is located usually has a relatively rich scatterer, and the user's terminal device receives a signal refracted or reflected by a plurality of surrounding scatterers, resulting in correlation in the channel fading process. Under this correlation, not all transmitting antennas contribute to or interfere with the terminal equipment, that is, for a specific user, under certain channel conditions, through corresponding processing, it is possible to make a certain transmitting antenna The user has no influence at all, and the transmitting antenna can transmit signals of other users without being interfered by the specific user, and does not cause interference to the user, that is, the principle of interference avoidance.

Specifically, for a system consisting of G base stations, each base station has N _t transmit antennas, and each base station has K ( K ≥ N _t ) users, each user has N _r antennas, and the base station And the user distribution is expressed as and M _mk , where

N≡ { l , 2,... , G} ,me { l ,2,...,G} ,ke { 1 ,2, ... , K}, from the nth base station to the mth cell The channel of the kth user is ^^, and each base station selects a part of its K users to provide services, that is, SDMA in the traditional sense, and the degree of freedom that each selected user can obtain is (d _f ≤ N _r , that is, processing at most independent data streams) ^ The selected set of service users is

The "μ„ I" operation here is the operation of finding the total number of elements in the "A" set.

In the architecture of an interference channel of three base stations, the available dimension for each user is 4 spaces.

(It can be considered that the receiver has 4 independent antennas and can process 4 signals), and FIG. 2A, FIG. 2B and FIG. 2C are interference processing methods from the base station B ₂ and the base station B ₃ for the user M „ 2A is a schematic diagram of interference alignment, FIG. 2B is a schematic diagram of interference avoidance, and FIG. 2C is a schematic diagram of interference avoidance coordination interference alignment. As shown in FIG. 2A, a channel matrix H from base station B ₂ and base station B ₃ to user Mu ₂ - u and 3⁄4 - _{u are} mutually uncorrelated, and the signals of the base station B ₂ and the base station B ₃ can be aligned in the interference alignment manner at the receiving end of the user B 1 into a dimension of two spaces, so that the user M can smoothly transmit 2 Signal of dimensions; as shown in Figure 2B, Is the idea of interference avoidance, and the equivalent channel is not full rank (if the equivalent channel is full rank, then since the base station B ₂ and the base station B ₃ have already filled the 4D space, the base station will not be able to transmit signals), The spatial presentation correlation, the base station B ₂ to the user's equivalent channel matrix 3⁄4—the zero position appears in the upper right corner, and its rank becomes 3, that is, the base station ^ can use the position without interference to the user Mu (ie, corresponding Spatial dimension) transmission, similarly, B ₃ to the equivalent channel matrix of the user M „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ „ Dimensions) transmission, so the overall effect is that the user can have 2 dimensions of spatial transmission signals. From a mathematical expression point of view, for 3⁄4— and 3⁄4—, there is always a non-zero 1 X 4 vector u ₂ And u ₃ , making 3⁄4—! *u ₂ =H ₃ 11 *u ₃ =0 , taking u ₂ and u ₃ as the first columns of the precoding matrices U ₂ and U ₃ of the base station B ₂ and the base station B ₃ , respectively, ie, rank ([U ₂ i *U ₂ H ₃ ii *U ₃ ] ) <2 , that is, in Figure 2B, at most only 2 spaces in the left column, leaving 2 spaces on the right side to the user M to transmit data. Figure 2C Synthesis in both cases above, according to the principle of first interference avoidance and spatial relevance ¾- "and ¾-" empty out the right two dimensional grid, i.e., using the principle of interference avoidance selecting u ₂₂ and u ₃₂ U ₂ respectively and The second column of U ₃ , and then according to the idea of interference alignment, the interference from the base station B ₂ in the upper left corner is aligned with the interference of the base station B ₃ , that is, 3⁄4 - u *! ^: ! ^ - u *u ₃₁ (corresponding to B ₂ The dimension corresponding to the grid in the upper left corner of B ₃ ), so that the total interference dimension is only rank ([3⁄4—„* ₂ 2⁄4—„*U ₃ ] ) = 1 , so it is possible to transmit signals with 3 space dimensions, which is effective. Increased system throughput.

Figure 2B above uses the idea of interference avoidance, where the equivalent channel is not full rank. If the equivalent channel is full rank, then the base station B ₂ and the base station B ₃ have already filled the 4-dimensional space, and the base station will not be able to transmit. signal. The idea of the embodiment of the present invention shown in FIG. 2C firstly performs interference avoidance according to the spatial correlation of the channel matrix, and then aligns the interference signal to the interference space that the user can process according to the principle of interference alignment, and cannot perform interference. When evasive, the interference alignment is directly performed, that is, the steps of acquiring the elements in the precoding matrix corresponding to steps 102 and 103 in the embodiment shown in FIG. 3 above.

Another assumption is that the antenna spacing between the base station and the user is half wavelength λ/2, then the angle extension vector can be defined. The quantity is:

- , · '' ¹ '" The corresponding origin beam vector is

i i _ ί and ^: end vector is

ΙΪ2(0) L( ),,,, ev ^{A 1} )1 The channel matrix H„ _m and the virtual angle extension channel matrix H ^v have the following correspondences:

H _n — _mk = ^ _R H _n ^v _ _mk A^

Here, the set of locations where the non-zero column vectors in each virtual angle extended channel matrix H _{n mk} are located is defined as the effective virtual angle set E„ ^v _m , (n≠me{l, 2,..., G}, ieA _m (here, G denotes G base stations, A denotes a user set, where A _m and the aforementioned A _n represent a set of users of different base stations, or a set of users of adjacent base stations), E: — = { ² ^ ^} }, where the superscript ν indicates the processing for H„ _m , the same below), the set of effective virtual transmit angle positions corresponding to each base station is Γ (it satisfies | | = , is {1, 2, a subset of ..., N _t }, r = {t„(l),t„ (···} ) , the effective transmit signal position corresponding to each base station (ie the precoding vector corresponding to the stream is not 0) The set is Γ ^ζ T ( T _n ^z = {q:qe{l,2...N _t },u: _q ≠0}, which is the qth column precoding vector of the nth base station), which can be avoided The set of users is M, and the set of users that need to be interfered with is .

In the algorithm flow of this embodiment, considering that the effective virtual angle type parameter changes slowly, the step of obtaining the interference avoidance parameter according to the above parameters can be performed offline, and the precoding and equalizer calculation based on the instantaneous channel state calculation can only pass through the online The operation is performed, so the process can be divided into two parts: an offline part and an online part. FIG. 3 shows a calculation flow of the offline part and the online part, that is, the step of acquiring the interference avoidance parameter corresponding to step 101 in the implementation shown in FIG. As shown in Figure 3, the specific steps are as follows: Step 401, an initialization step, that is, initializing the user set 4, the effective virtual transmission angle position set ^, the effective emission position set _Fn ^u , and M , where ^^:^ ^^ ,... G} , making them all empty sets, defining = { + 1,^+2,. That is the interference space dimension that the kth user of the nth base station can handle;

Step 402: Add a user according to the scheduling principle, that is, add a service user, and corresponding d _f effective virtual transmission angles to form a new user set 4=4^ {k} and new

T = T \}E _sub , where is given by:

"", ,E J = arg min ( V V IE -[λίΤ'^Ε ,))

^L TM ⁶ ” ^3⁄4 " , ₂ ... _{1 , ₂ .. \4,^=( — ^), IJ^, J^ _≠ " ^I "-TM ^M - ^{U SUB} ,,

And updated 7

In this embodiment, "A\B" means that the B element or the B set is removed from the set A, the same below. Step 403: For each selected user Mma _k , according to whether the avoidance condition is established, whether it should belong to the avoidable user set M, the avoidance condition can be expressed as:

Step 404: Determine whether all selected users can use interference avoidance, that is, determine

Whether M^^t/^M^eA} is established, if yes, save the obtained μ„,:Γ,Γ„ ^ζ ,Μ }, and return to step 402, otherwise go to step 405;

Step 405: Update Γ ^ζ , that is, including determining whether all users can be processed by interference alignment, and determining whether all virtual transmission dimensions have been used for alignment, as shown in FIG. 4, where Β is a base station set , Proceed as follows:

Step 4051, initialization, order. ₎ is an empty set, ^Μ _α1 =φ, and updated

Step 4052: Initialize and make the base station set to an empty set, that is, S=, and then select any user.

:}\(M UM _{FL )} ), which represents the result of the previous calculation; The degree of freedom required for it, ie | |+| nE„_ _mi |^„|≥ μ„| is true, where η is defined as w = arg min gate, otherwise the step is executed

{l n mk , if not established step 4054

,2,...,G}\({m}U8)

Step 4056;

Step 4054, determining whether all virtual angles have been used for interference alignment, that is,

T _n ^z ={\,2,..., N , V«e{l,2,... G} is true, if yes, exit the algorithm and output the same result as the last calculation { }{7 }{7 }M , that is, all the base stations have been updated, then the iteration is stopped and the output is output.

Otherwise, perform step ⁴ 0 ⁵⁵ ;

Step 4055, update the effective transmit signal position set {Γ„ ^ζ } = {Γ„ ^ζ }υ }, where n, q by = arg min _z ∑ E: _mk & EUT _n ^z = N _r - simultaneously returns to step 403;

Steps 4056, B, F: _k , where S = SUW, and, if | nE„- _mi | ≥, remove any elements in ^ nE„-, otherwise, update ^ = \ — _m , and from ^ Remove any kl -KnE,

Step 4057, determining whether the interference from all the transmitters has been aligned at the receiver, that is, whether B = {\, 2, ... G}\{ } is established, if yes, executing step 4058, otherwise performing step 4056; 4058. Determine whether all selected receivers have been selected into the avoidance set, or have been confirmed to achieve interference alignment, that is, ^^^/ {M _B Ae^^M^ is established, if yes, execute step 4059, otherwise return Step 4052;

Step 40 ⁵⁹ , store ( , , ^{2 2} }, M _me , and return to step ⁴ 0 ² .

In addition, the calculation of the online part corresponds to step 102 and the steps in the embodiment shown in FIG.

The step of obtaining the value of each element in the precoding matrix may include the following steps: Step 501: Calculate an element value of the fixed element in the precoding matrix according to the { }{7^}{7^} outputted by the offline part. : ⁿ ^ ^J °ifp^&p≠t _n ( _q )

Where { ( , ), €{1, 2...7^}, €{1, 2... }} is a meta-step 502 in the precoding matrix, using the online interference avoidance algorithm to obtain all the evasive users in the middle Corresponding equalizer:

Column q, "} = E„- _m nr„ ^z , n≠m;

Then QR decomposition is performed: H _m ^E _ak =Q _mak UR where ρ _Μ is an orthogonal matrix and R _k is an upper triangular matrix. You can get:

;4^— 十1) ₅ «^"^—Twelve 2).'(1"«3⁄4_ ^ where '- is the qth column of ^;

Step 503: Calculate the remaining part of the precoder and the equalizer of other users by using the principle of interference alignment;

Step 504: Perform interference suppression by using a zero-forcing or MMSE algorithm in the intra-cell SDMA, that is, correct the element values of each element in the pre-coding matrix according to the zero-forcing algorithm and/or the minimum mean square error algorithm.

The precoding processing method provided by the foregoing embodiment of the present invention first performs interference avoidance according to the spatial correlation of the channel matrix, and then aligns the interference signal to the interference space that the user can process according to the principle of interference alignment, and can effectively suppress multiple transmissions. Interference between signals in an antenna communication system.

The embodiment of the present invention further provides a precoding processing apparatus, which is capable of performing the precoding processing method in the foregoing embodiment, and FIG. 5 is a schematic structural diagram of an embodiment of the precoding processing apparatus according to the present invention. The device includes a parameter acquisition module 11, a first calculation module 12, a second calculation module 13, a construction module 14, and an encoding processing module 15, and a parameter acquisition module. The method for obtaining the spatial channel correlation parameter of the communication system where the base station is located, and obtaining the interference avoidance parameter according to the spatial channel correlation parameter; the first calculating module 12 is configured to obtain the precoding matrix to be constructed according to the interference avoidance parameter. The second computing module 13 is configured to obtain an element value of the element other than the fixed element in the precoding matrix to be constructed according to the interference alignment algorithm; the building module 14 is configured to use the pre-built pre-built according to the acquired Constructing a precoding matrix by using an element value of a fixed element of the coding matrix and an element value of the element other than the fixed element in the precoding matrix to be constructed; the encoding processing module 15 is configured to perform precoding processing on the data stream according to the precoding matrix .

The precoding processing apparatus provided by the foregoing embodiment of the present invention obtains the spatial channel correlation parameter of the communication system where the base station is located, and further acquires the interference avoidance parameter, to calculate the element value of the fixed element of the precoding matrix, and performs interference avoidance; The element values of other elements in the precoding matrix are calculated according to the interference, and the precoding of the data stream by using the precoding matrix obtained above can suppress the interference.

The interference avoidance parameter in the foregoing embodiment of the present invention may specifically include a base station service user set, an effective virtual transmit angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, and a evasive user set, and refer to a valid virtual angle class parameter. The change in the communication system is relatively slow, and thus can be obtained and stored in a pre-calculated manner. As shown in FIG. 6, the pre-coding processing apparatus provided in the foregoing embodiment may further include a storage module 19, the storage module 19 For storing the interference avoidance parameter obtained in an offline manner according to the spatial channel correlation parameter, the parameter acquisition module 11 described above may obtain the interference avoidance parameter from the storage module 19.

On the basis of the foregoing embodiment, the first equalizer acquisition module 16 and the second equalizer acquisition module 17 are further included, and the first equalizer acquisition module 16 is configured to acquire the user concentration in the communication system where the base station is located. The equalizer that is used by the user to enable the data receiving end to perform interference cancellation on the received data stream; the second equalizer acquiring module 17 is configured to acquire, in the communication system where the base station is located, other users except the users in the centralized user group, An equalizer for causing the data receiving end to perform interference cancellation on the received data stream. In a specific implementation, the data correction module 18 may be further configured to modify the element values of the elements in the precoding matrix according to the zero forcing algorithm and/or the minimum mean square error algorithm.

The embodiment of the invention further provides a base station, which comprises the precoding processing device provided in the above embodiment. The base station can obtain the spatial channel correlation parameter of the communication system where the base station is located, obtain the interference avoidance parameter according to the spatial channel correlation parameter, and calculate the element value of the fixed element of the precoding matrix to implement the interference avoidance; The element values of other elements in the precoding matrix are calculated and pre-coded by using the precoding matrix obtained above, which can suppress the interference.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk. It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A precoding processing method, comprising:

The data stream is precoded according to the precoding matrix.

2. The precoding processing method according to claim 1, wherein the interference avoidance parameter comprises a base station service user set, an effective virtual transmission angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, and a evasive user. Set; or

The interference avoidance parameter includes a base station service user set, a valid virtual transmission angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, a avoidance user set, a change set of the effective virtual transmit angle position corresponding to the base station, and an effective corresponding to the base station. A set of changes in the position of the transmitted signal.

The precoding processing method according to claim 2, wherein after the obtaining the element value of the fixed element of the precoding matrix to be constructed according to the interference avoidance parameter, the method further includes: acquiring, corresponding to each user in the evasive user set An equalizer for causing the data receiving end to perform interference cancellation on the received data stream;

And after obtaining the element values of the elements other than the fixed elements in the precoding matrix according to the interference alignment algorithm, the method further includes:

Obtaining an equalizer for causing the data receiving end to perform interference cancellation on the received data stream, corresponding to other users in the communication system where the base station is located, except for the users in the user group.

4. The precoding processing method according to claim 1, wherein the basis is The spatial channel correlation parameter obtains the interference avoidance parameter as follows:

Obtaining the interference avoidance parameter in an offline manner according to the spatial correlation parameter.

The precoding processing method according to claim 1, wherein before the precoding processing on the data stream according to the precoding matrix, the method further includes:

The element values of the elements in the precoding matrix are modified according to a zero forcing algorithm and/or a minimum mean square error algorithm.

6. A precoding processing apparatus, comprising:

And an encoding processing module, configured to perform precoding processing on the data stream according to the precoding matrix.

7. The precoding processing apparatus according to claim 6, further comprising: a storage module, configured to store an interference avoidance parameter acquired in an offline manner according to the spatial channel correlation parameter.

The pre-coding processing apparatus according to claim 6, wherein the interference avoidance parameter comprises a base station service user set, an effective virtual transmission angle position set corresponding to the base station, an effective transmit signal position set corresponding to the base station, and a evasive user. The interference avoidance parameter includes a base station service user set, a valid virtual transmission angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, a set of avoidance users, a change set of effective virtual transmit angle positions corresponding to the base station, and a base station. And corresponding to the change set of the effective transmit signal locations, the device further includes: a first equalizer acquiring module, configured to acquire an equalizer corresponding to each user in the communication system of the base station, and configured to enable the data receiving end to perform interference cancellation on the received data stream;

The second equalizer acquiring module is configured to obtain an equalizer corresponding to other users except the user in the communication system of the base station, and configured to enable the data receiving end to perform interference cancellation on the received data stream.

9. The precoding processing apparatus according to claim 6, further comprising: a data correction module, configured to correct an element value of each element in the precoding matrix according to a zero forcing algorithm and/or a minimum mean square error algorithm .

A base station, comprising the precoding processing apparatus according to any one of claims 6-9.