CN104301074B - Eliminate the method and apparatus of interference - Google Patents

Abstract

Embodiments of the present invention provide a method and device for eliminating interference. The method includes: the base station acquires J null spaces corresponding to J user equipments, wherein there is a common null space among the J-1 null spaces corresponding to any J-1 user equipments; the base station determines according to the J public null spaces J pieces of precoding information corresponding to J user equipments, and according to the J pieces of precoding information, determine the joint precoding information, and according to the joint precoding information, perform joint precoding on the original downlink information sent to the J user equipments, Determine the downlink information sent to J user equipments; wherein, the downlink channel information of any user equipment in the J user equipments is the same as the J-1 precoding information corresponding to other J-1 user equipments that have a common null space The product is 0, so as to eliminate the interference to the downlink information sent by the base station to any user equipment among the J user equipments when the base station sends downlink information to other J-1 user equipments.

Description

Method and device for eliminating interference

technical field

Embodiments of the present invention relate to communication technologies, and in particular to a method and device for eliminating interference.

Background technique

Multiple Input Multiple Output (MIMO) technology uses multiple antennas in base stations and user equipment to suppress channel fading, thereby greatly improving channel capacity, coverage and spectrum utilization. The MIMO technology includes a Multi-User MIMO MU-MIMO (MU-MIMO for short) technology and a Single-User MIMO SU-MIMO technology.

Compared with the SU-MIMO technology, the MU-MIMO technology can effectively overcome the problems of fewer user equipment antennas and low channel capacity. Therefore, the MU-MIMO technology has been widely used. For MU-MIMO technology, the user equipment generally feeds back the downlink channel information measured by itself to the base station, and then the base station selects a suitable terminal from the terminals that need service according to its own scheduling strategy for pairing. The downlink information of the successfully paired user equipment can be mapped to different spatial information streams through MIMO spatial multiplexing, and transmitted on the same communication resource.

When the downlink information of multiple paired user equipments is transmitted on the same communication resource, it is necessary to deal with the interference caused by spatial multiplexing, including: the interference of information streams between different users and the interference between different information streams in a single user interference. However, in the prior art, in order to eliminate the interference of information flow between different users, the base station will adjust the mapping direction of the information flow fed back by the user equipment, resulting in the degradation of the communication quality of the user equipment.

Contents of the invention

Embodiments of the present invention provide a method and device for eliminating interference, so as to eliminate the interference of information flows between different user equipments and improve the communication quality of the user equipments.

In the first aspect, an embodiment of the present invention provides a method for eliminating interference, including:

The base station acquires J null spaces corresponding to J user equipments, wherein J≥2, J is an integer, and there is a common null space among the J-1 null spaces corresponding to any J-1 user equipments, so The number of public null spaces is J;

The base station determines J pieces of precoding information corresponding to the J user equipments according to the J common null spaces, and determines joint precoding information of the J user equipments according to the J pieces of precoding information;

The base station performs joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determines the downlink information sent to the J user equipments;

Wherein, the product of the downlink channel information of any user equipment among the J user equipments and the J-1 pieces of precoding information corresponding to other J-1 user equipments that have a common null space is 0, so as to eliminate the presence of the base station. When the other J-1 user equipments in the common null space send downlink information, the base station interferes with sending downlink information to any user equipment in the J user equipments.

With reference to the first aspect, in the first possible implementation manner of the first aspect, before the base station obtains J null spaces corresponding to J user equipments, it further includes:

The base station obtains the null spaces of Q user equipments, and obtains Q null spaces;

The base station determines that J null spaces exist in the Q null spaces, where J≤Q, and where Q is an integer.

With reference to the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the base station acquiring the null spaces of Q user equipments includes:

The base station receives channel state information sent by the Q user equipments;

The base station determines the null spaces of the Q user equipments according to the channel state information.

With reference to the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the channel state information includes any of the following:

said null space;

difference information of the null space;

An identifier of a null space codeword corresponding to a quantized null space.

With reference to the first aspect and any one of the first to third possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the base station, according to the joint precoding information, Perform joint precoding on the original downlink information sent to the J user equipments, and determine the downlink information sent to the J user equipments, including:

According to formula (1), determine the downlink information sent to the jth user equipment among the J user equipments;

Wherein, the formula (1) is:

Wherein, Y _j represents the downlink information received by the jth user equipment, H _j represents the downlink channel information of the jth user equipment, P _j represents the jth user equipment in the joint precoding information Precoding information, the S _j represents the original downlink information of the jth user equipment, P _k represents the precoding information of the kth user equipment among the J-1 user equipments in the joint precoding information, S _k represents the original downlink information of the k-th user equipment among the J-1 user equipments, the N _j represents the noise signal corresponding to the j-th user equipment, and j is 0 or a positive integer.

With reference to the fourth possible implementation of the first aspect, in the fifth possible implementation of the first aspect, when J=2, j=0 or 1;

When the j=0, the Y ₀ =H ₀ P ₀ S ₀ +H ₀ P ₁ S ₁ +N ₀ , the H ₀ P ₁ S ₁ =0;

When the j=1, the Y ₁ =H ₁ P ₁ S ₁ +H ₁ P ₀ S ₀ +N ₁ , and the H ₁ P ₀ S ₀ =0.

In a second aspect, an embodiment of the present invention provides a method for eliminating interference, including:

The user equipment obtains the null space of the downlink channel;

The user equipment determines channel state information according to the null space;

The user equipment sends the channel state information to the base station, so that the base station determines the null space according to the channel state information, and eliminates when the user equipment receives downlink information according to the null space, other user equipment Interference of the user equipment.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the user equipment acquiring a null space includes:

The user equipment obtains downlink channel information H ₀ according to the reference signal;

The user equipment obtains the null space V ⁽⁰⁾ _of the downlink channel according to the downlink channel information H0;

where HV ⁽⁰⁾ =0.

With reference to the second aspect or the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the channel state information includes any of the following:

said null space;

difference information of the null space;

An identifier of a null space codeword corresponding to a quantized null space.

In a third aspect, an embodiment of the present invention provides a base station, including:

An acquisition module, configured to acquire J null spaces corresponding to J user equipments, wherein, said J≥2, said J is an integer, and there are common J-1 null spaces corresponding to any J-1 user equipments A null space, the number of the common null spaces is J;

A precoding module, configured to determine J pieces of precoding information corresponding to the J user equipments according to the J common null spaces, and determine joint precoding of the J user equipments according to the J pieces of precoding information information;

A determining module, configured to perform joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determine the downlink information sent to the J user equipments;

Wherein, the product of the downlink channel information of any user equipment among the J user equipments and the J-1 pieces of precoding information corresponding to other J-1 user equipments that have a common null space is 0, so as to eliminate the presence of the base station. When the other J-1 user equipments in the common null space send downlink information, the base station interferes with sending downlink information to any user equipment in the J user equipments.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the acquiring module is further configured to: before acquiring the J null spaces corresponding to the J user equipments, acquire the zero spaces of the Q user equipments space, obtain Q null spaces, determine that there are J null spaces in the Q null spaces, the J≤Q, and the Q is an integer.

With reference to the first possible implementation of the third aspect, in the second possible implementation of the third aspect, the acquisition module is further specifically configured to:

receiving channel state information sent by the Q user equipments;

Determine the null spaces of the Q user equipments according to the channel state information.

With reference to the second possible implementation of the third aspect, in a third possible implementation of the third aspect, the channel state information includes any of the following:

said null space;

difference information of the null space;

An identifier of a null space codeword corresponding to a quantized null space.

In combination with the third aspect and any one of the first to third possible implementations of the third aspect, in a fourth possible implementation of the third aspect, the determining module is specifically configured to:

According to formula (1), determine the downlink information sent to the jth user equipment among the J user equipments;

Wherein, the formula (1) is:

Wherein, Y _j represents the downlink information received by the jth user equipment, H _j represents the downlink channel information of the jth user equipment, P _j represents the jth user equipment in the joint precoding information Precoding information, the S _j represents the original downlink information of the jth user equipment, P _k represents the precoding information of the kth user equipment among the J-1 user equipments in the joint precoding information, S _k represents the original downlink information of the k-th user equipment among the J-1 user equipments, the N _j represents the noise signal corresponding to the j-th user equipment, and j is 0 or a positive integer.

In combination with the fourth possible implementation of the third aspect, in the fifth possible implementation of the third aspect, when J=2, j=0 or 1;

When the j=0, the Y ₀ =H ₀ P ₀ S ₀ +H ₀ P ₁ S ₁ +N ₀ , the H ₀ P ₁ S ₁ =0;

When the j=1, the Y ₁ =H ₁ P ₁ S ₁ +H ₁ P ₀ S ₀ +N ₁ , and the H ₁ P ₀ S ₀ =0.

In a fourth aspect, an embodiment of the present invention provides a user equipment, including:

An acquisition module, configured to acquire the null space of the downlink channel;

A determining module, configured to determine channel state information according to the null space;

A sending module, configured to send the channel state information to a base station, so that the base station determines the null space according to the channel state information, and eliminates other user equipment when the user equipment receives downlink information according to the null space interference to the user equipment.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the acquiring module is specifically configured to:

Obtain downlink channel information H ₀ according to the reference signal;

Obtain the null space V ⁽⁰⁾ _of the downlink channel according to the downlink channel information H0;

where HV ⁽⁰⁾ =0.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the channel state information includes any of the following:

said null space;

difference information of the null space;

An identifier of a null space codeword corresponding to a quantized null space.

Embodiments of the present invention provide a method and device for eliminating interference. The base station obtains J null spaces corresponding to J user equipments, wherein J≥2, J is an integer, and any J-1 user equipments correspond to There is a common null space among the J-1 null spaces, and the number of the common null spaces is J; the base station determines J precodings corresponding to the J user equipments according to the J common null spaces information, and determine the joint precoding information of the J user equipments according to the J pieces of precoding information; the base station performs the original downlink information sent to the J user equipments according to the joint precoding information Joint precoding, determining the downlink information sent to the J user equipments, and eliminating the need for the base station to send any downlink information to any of the J user equipments when the base station sends downlink information to other J-1 user equipments that have a common null space. Interference caused by user equipment sending downlink information.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a flow chart of Embodiment 1 of the method for eliminating interference in the present invention;

FIG. 2 is a schematic diagram of a communication system according to an embodiment of the present invention;

FIG. 3 is a flow chart of Embodiment 2 of the method for eliminating interference of the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

FIG. 1 is a flow chart of Embodiment 1 of a method for eliminating interference according to the present invention. As shown in FIG. 1 , the method for eliminating interference provided by this embodiment of the present invention may be executed by a user equipment. The user equipment can be implemented by software and/or hardware. The method for eliminating interference provided in this embodiment includes:

Step 101, the user equipment acquires the null space of the downlink channel;

Step 102, the user equipment determines channel state information according to the null space;

Step 103, the user equipment sends channel state information to the base station, so that the base station determines the null space according to the channel state information, and eliminates the interference of other user equipment on the user equipment when the user equipment receives downlink information according to the null space.

In the method for eliminating interference provided in the embodiment of the present invention, a base station (Base Station, BS for short) can eliminate interference between user equipments (User Equipment, UE for short). The method for eliminating interference provided in this embodiment may be applied to the communication system shown in FIG. 2 , where FIG. 2 is a schematic diagram of the communication system according to the embodiment of the present invention. As shown in Fig. 2, the communication system is composed of UE0, UE1 and BS. Those skilled in the art can understand that in a specific implementation process, the communication system may include multiple UEs, not limited to UE0 and UE1 in this embodiment.

In the specific implementation process, UE ₀ and UE ₁ measure the downlink channel according to the setting requirements of the communication system, and obtain the downlink channel information H ₀ and H ₁ respectively. Then UE ₀ and UE ₁ respectively obtain their corresponding null spaces according to H ₀ and H ₁ with and according to with Determine channel state information (Channel State Information, CSI for short), and then send the channel state information to the BS, that is, send CSI ₀ and CSI ₁ to the BS. The BS performs interference cancellation between user equipments according to the null space in the CSI sent by multiple UEs.

First, this embodiment describes in detail how the user equipment obtains the null space in step 101 . For ease of description, this embodiment takes UE ₀ as an example to describe in detail how the user equipment obtains the null space.

UE ₀ measures the downlink channel and obtains downlink channel information H ₀ ;

UE ₀ performs Singular Value Decomposition (SVD for short) on the downlink channel information H ₀ to obtain

Among them, H ₀ is an M×N matrix, N is the number of antennas used by the base station, M is the number of antennas used by the user equipment, U is an M×M unitary matrix, V is an N×N unitary matrix, and Σ ₀ is an M×N diagonal matrix , M and N are positive integers, * represents matrix conjugate transpose operation.

The diagonal elements of Σ ₀ are σ ₁ , σ ₂ ,...σ _X , and at the same time, the diagonal elements have the following relationship, σ ₁ ≥σ ₂ , ≥...≥σ _X ≥0, where X=min(M ,N);

V ₀ =[v ₁ , v ₂ ,...v _n ], where v ₁ , v ₂ ,...v _n are N×1 matrices respectively.

Then, UE ₀ determines the null space of Σ ₀ according to the V ₀ and the Σ ₀ , and the specific implementation method is as follows:

When the diagonal element of Σ ₀ is σ _x =0, where 1<x≤X, then σ _x =σ _x+1 =…=σ _X =0;

UE ₀ obtains v _x , v _x+1 , ... v _X corresponding to the diagonal elements σ _x , σ _x+1 , ... σ _X according to the corresponding relationship between V ₀ and Σ ₀ . Those skilled in the art can understand that there is a corresponding relationship between the rows and columns of V ₀ and Σ ₀ .

UE ₀ determines the null space of UE ₀ according to v _x , v x _{+ 1} ,...v _X , and determines the non-zero space of the user equipment according to v _x , v x+1 ,...v _X. Specifically, the vector space composed of v _x ,v _x+1 ,…v _X is called the null space of H ₀ , that is, the null space of UE ₀ , which can be used Represents the null space of UE ₀ ; the vector space composed of v _x , v _x+1 ,...v _X is called the non-zero space of H ₀ , that is, the non-zero space of UE ₀ , which can be used Indicates the non-null space for UE ₀ . According to the definition of null space,

In step 102, UE ₀ according to the null space Determine channel state information, where the channel state information includes any of the following:

null space;

The difference information of the null space;

An identifier of a null space codeword, which corresponds to a quantized null space.

Specifically, UE ₀ can directly set the null space as channel state information; or

UE ₀ determines the determined from the previous moment The difference information includes increment and decrement, and the difference information is used as channel state information. In this way, the overhead of sending CSI ₀ can be further reduced. or

UE ₀ can set the Perform quantization processing, compare with the existing zero-space codebook, find the corresponding zero-space codeword, and use the identifier of the zero-space codeword as channel state information, and the identifier of the zero-space codeword can uniquely correspond to a quantization A null-space codeword in the null-space codebook of . In this way, the overhead of sending CSI ₀ can be further reduced. At the same time, the null space codebook can be determined by modeling and analyzing the space channel and cooperating with information obtained from a large number of simulations/measurements.

In the embodiment of the present invention, the user equipment acquires the null space, and the user equipment sends the null space to the base station, so that the base station can eliminate the interference of other user equipment to the user equipment when receiving downlink information according to the null space. User equipment receives interference from downlink information.

FIG. 3 is a flowchart of Embodiment 2 of the method for eliminating interference according to the present invention. As shown in FIG. 3 , the method for eliminating interference provided by the embodiment of the present invention can be executed by a base station. The base station can be implemented by software and/or hardware. The method for eliminating interference provided in this embodiment includes:

Step 201, the base station obtains J null spaces corresponding to J user equipments, wherein, said J≥2, said J is an integer, and there are common zeros among J-1 null spaces corresponding to any J-1 user equipments space, the number of the public null spaces is J;

Step 202, the base station determines J pieces of precoding information corresponding to the J user equipments according to the J common null spaces, and determines the joint precoding information of the J user equipments according to the J pieces of precoding information;

Step 203, the base station performs joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determines the downlink information sent to the J user equipments;

Wherein, the product of the downlink channel information of any user equipment among the J user equipments and the J-1 pieces of precoding information corresponding to other J-1 user equipments that have a common null space is 0, so as to eliminate the presence of the base station. When the other J-1 user equipments in the common null space send downlink information, the base station interferes with sending downlink information to any user equipment in the J user equipments.

The application scenario of the embodiment of the present invention may be shown in the embodiment in FIG. 1 , and details will not be described here in this embodiment.

In step 201, the base station obtains J null spaces corresponding to J user equipments. Those skilled in the art can understand that each user equipment has a null space belonging to it. The manner in which each user equipment obtains the null space may refer to step 101 in FIG. 1 , which will not be repeated in this embodiment.

In particular, J is an integer greater than or equal to 2. In the specific implementation process, there is a common null space between J-1 null spaces corresponding to any J-1 user equipments relative to other user equipments. The other user equipments refer to user equipments other than J-1 user equipments among the J user equipments. Those skilled in the art can understand that there are J public null spaces in total public null space means that J-1 user equipments have the same null space, and the same null space not only refers to the same null space, but also refers to the same null space codeword when the null space is quantized into a null space codeword .

For example, when J=3, there is a common null space between the two null spaces corresponding to any two user equipments Specifically, for UE ₀ , UE ₁ , and UE ₂ , UE ₀ , UE ₁ correspond to There is a common null space with respect to UE ₂ between corresponding to UE ₀ and UE ₂ There is a common null space with respect to UE ₁ between corresponding to UE ₁ and UE ₂ There is a common null space relative to UE ₀ between At the same time, there are three common null spaces, which are

Optionally, for the jth user equipment among the J user equipments, the null space of J-1 user equipments public null space

In particular, Has the following properties:

Among them, H ₀ to H _J-1 represent downlink channel information of J-1 user equipments respectively, and T represents a matrix transposition operation.

Optionally, before step 201, the base station obtains the null spaces of Q user equipments to obtain Q null spaces; the base station determines that there are J null spaces in the Q null spaces, J≤Q, and Q is an integer.

Specifically, the base station receives channel state information sent by Q user equipments, and determines the null spaces of the Q user equipments according to the channel state information, wherein the channel state information includes any of the following:

null space;

The difference information of the null space;

An identifier of a null space codeword, which corresponds to a quantized null space.

In the specific implementation process, the base station receives the null spaces sent by Q user equipments, the base station determines that there are J null spaces in the Q null spaces, and the basis for determining J null spaces by the base station is: any J-1 user equipments correspond to There is a common null space between the J-1 null spaces of information.

In step 202, the base station determines J pieces of precoding information corresponding to J user equipments according to the J common null spaces, and determines joint precoding information of the J user equipments according to the J pieces of precoding information.

Specifically, for the jth user equipment, the null space of J-1 user equipment public null space base station pass Obtain precoding information P _j of the jth user equipment.

Please continue to refer to the embodiment of J=3, when J=3, the base station according to the public null space Determine the precoding information P ₀ of UE ₀ , according to the public null space Determine the precoding information P ₁ of UE ₁ , according to the public null space Precoding information P ₂ of UE ₂ is determined.

When there are J user equipments, through the above method, there are J pieces of precoding information, respectively P ₀ , P ₁ ,...,P _j-1 ,P _j ,P _j+1 ,...P _J-1 , according to J pieces of precoding information, determine the joint precoding information of J user equipments, and obtain the joint precoding information [P ₀ ,P ₁ ,…,P _j-1 ,P _j ,P _j+1 ,…P _J-1 ] ; In particular, according to the nature of the null space, [H ₀ ,…,H _j-1 , H _j+1 ,…,H _J-1 ] ^T ·P _j =0

In step 203, the base station combines the original downlink information sent to J user equipments according to [P ₀ , P ₁ ,...,P _j-1 ,P _j ,P _j+1 ,...P _J-1 ] Precoding, determining the downlink information sent to J user equipments:

Wherein, Y represents downlink information received by the user equipment, H represents downlink channel information, P represents precoding information, S represents original downlink information, and N represents a noise signal.

Those skilled in the art can understand that S is the original downlink information, and the base station needs to perform joint precoding and other processing on the original downlink information when sending the original downlink information to the user equipment. Therefore, after the user equipment receives the downlink information, it needs to The downlink information is subjected to processing such as denoising and decoding to obtain original downlink information.

In the specific implementation process, for the jth user equipment among the J user equipments, the downlink information sent by the base station is:

Wherein, Y _j represents the downlink information received by the jth user equipment, H _j represents the downlink channel information of the jth user equipment, P _j represents the jth user equipment in the joint precoding information Precoding information, the S _j represents the original downlink information of the jth user equipment, P _k represents the precoding information of the kth user equipment among the J-1 user equipments in the joint precoding information, S _k represents the original downlink information of the k-th user equipment among the J-1 user equipments, the N _j represents the noise signal corresponding to the j-th user equipment, and j is 0 or a positive integer.

because That is, the inter-user interference of other J-1 user equipments on the jth user equipment is eliminated.

Those skilled in the art can understand that this embodiment only shows that the base station determines the downlink information of the jth user equipment. The MIMO technology sends J pieces of downlink information to corresponding user equipments.

For ease of description, this implementation takes two user equipments as an example, that is, when J=2, j=0 or 1;

The base station receives the UE ₀ and UE ₁ sent with is the common null space relative to UE ₁ , is the common null space relative to UE ₀ .

The base station is receiving with Afterwards, the precoding information P ₀ and P ₁ required by the original downlink information S ₀ and S ₁ sent to UE ₀ and UE ₁ are obtained through precoding processing,

P ₀ and P ₁ also have null space characteristics, namely:

H ₀ P ₁ =0,

H ₁ P ₀ =0.

Then the downlink information Y ₀ and Y ₁ received by UE ₀ and UE ₁ can be described by the following publicity:

Y ₀ =H ₀ P ₀ S ₀ +H ₀ P ₁ S ₁ +N ₀

Y ₁ =H ₁ P ₁ S ₁ +H ₁ P ₀ S ₀ +N ₁

For UE ₀ , H ₀ P ₁ S ₁ is the inter-user interference caused by UE ₁ to it. Similarly, H ₁ P ₀ S ₀ is the inter-user interference generated by UE ₀ to UE ₁ . Since zero space information is used as precoding in the transmitter part of the base station, there are H ₀ P ₁ S ₁ =0 and H ₁ P ₀ S ₀ =0, so the interference between users is completely eliminated.

To sum up, in the embodiment of the present invention, the base station obtains J null spaces corresponding to J user equipments, wherein J≥2, J is an integer, and J-1 null spaces corresponding to any J-1 user equipments There are public null spaces between them, and the number of the public null spaces is J; the base station determines J pieces of precoding information corresponding to the J user equipments according to the J public null spaces, and according to the J piece of precoding information to determine the joint precoding information of the J user equipments; the base station performs joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determines the joint precoding information to be sent to the J user equipments The downlink information sent by the J user equipments eliminates the interference that the base station sends downlink information to any user equipment in the J user equipments when the base station sends downlink information to other J-1 user equipments that have a common null space .

FIG. 4 is a schematic structural diagram of Embodiment 1 of the base station of the present invention. As shown in FIG. 4 , the base station 40 provided by the embodiment of the present invention includes an acquisition module 401 , a precoding module 402 and a determination module 403 .

Wherein, the acquiring module 401 is configured to acquire J null spaces corresponding to J user equipments, wherein said J≥2, said J is an integer, and any J-1 null spaces corresponding to J-1 user equipments There is a common null space among them, and the number of said common null spaces is J;

The precoding module 402 is configured to determine J pieces of precoding information corresponding to the J user equipments according to the J common null spaces, and determine the joint precoding information of the J user equipments according to the J pieces of precoding information. coded information;

A determining module 403, configured to perform joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determine the downlink information sent to the J user equipments;

Wherein, the product of the downlink channel information of any user equipment among the J user equipments and the J-1 pieces of precoding information corresponding to other J-1 user equipments that have a common null space is 0, so as to eliminate the presence of the base station. When the other J-1 user equipments in the common null space send downlink information, the base station interferes with sending downlink information to any user equipment in the J user equipments.

The base station provided by the embodiment of the present invention can be used to implement the technical solution of the above method embodiment, and its implementation principle and technical effect are similar, and will not be repeated here.

Optionally, the acquiring module 401 is further configured to: before acquiring the J null spaces corresponding to the J user equipments, acquire the null spaces of the Q user equipments, obtain the Q null spaces, and determine the Q null spaces There are J null spaces in the space, said J≤Q, and said Q is an integer.

Optionally, the obtaining module 401 is further specifically configured to:

receiving channel state information sent by the Q user equipments;

Determine the null spaces of the Q user equipments according to the channel state information.

Optionally, the channel state information includes any of the following:

said null space;

difference information of the null space;

An identifier of a null space codeword corresponding to a quantized null space.

Optionally, the determining module 403 is specifically configured to:

According to formula (1), determine the downlink information sent to the jth user equipment among the J user equipments;

Wherein, the formula (1) is:

Wherein, Y _j represents the downlink information received by the jth user equipment, H _j represents the downlink channel information of the jth user equipment, P _j represents the jth user equipment in the joint precoding information Precoding information, the S _j represents the original downlink information of the jth user equipment, P _k represents the precoding information of the kth user equipment among the J-1 user equipments in the joint precoding information, S _k represents the original downlink information of the k-th user equipment among the J-1 user equipments, the N _j represents the noise signal corresponding to the j-th user equipment, and j is 0 or a positive integer.

Optionally, when the J=2, the j=0 or 1;

When the j=0, the Y ₀ =H ₀ P ₀ S ₀ +H ₀ P ₁ S ₁ +N ₀ , the H ₀ P ₁ S ₁ =0;

When the j=1, the Y ₁ =H ₁ P ₁ S ₁ +H ₁ P ₀ S ₀ +N ₁ , and the H ₁ P ₀ S ₀ =0.

The base station provided by the embodiment of the present invention can be used to implement the technical solution of the above method embodiment, and its implementation principle and technical effect are similar, and will not be repeated here.

FIG. 5 is a schematic structural diagram of the first embodiment of the user equipment of the present invention. As shown in FIG.

Wherein, the obtaining module 501 is used to obtain the null space of the downlink channel;

A determining module 502, configured to determine channel state information according to the null space;

The sending module 503 is configured to send the channel state information to the base station, so that the base station determines the null space according to the channel state information, and eliminates other users when the user equipment receives downlink information according to the null space Interference of the device to the user equipment.

The user equipment provided by the embodiment of the present invention can be used to implement the technical solution of the method embodiment shown in FIG. 1 , and its implementation principle and technical effect are similar, and will not be repeated here.

Optionally, the obtaining module 501 is specifically configured to:

Obtain downlink channel information H ₀ according to the reference signal;

Obtain the null space V ⁽⁰⁾ _of the downlink channel according to the downlink channel information H0;

where HV ⁽⁰⁾ =0.

Optionally, the channel state information includes any of the following:

said null space;

difference information of the null space;

An identifier of a null space codeword corresponding to a quantized null space.

The user equipment provided by the embodiments of the present invention can be used to implement the technical solutions of the above method embodiments, and its implementation principles and technical effects are similar, and will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (12)

1. A method for eliminating interference, characterized in that, comprising: The base station acquires J null spaces corresponding to J user equipments, wherein J≥2, J is an integer, and there is a common null space among the J-1 null spaces corresponding to any J-1 user equipments, so The number of public null spaces is J; The base station determines J pieces of precoding information corresponding to the J user equipments according to the J common null spaces, and determines joint precoding information of the J user equipments according to the J pieces of precoding information; The base station performs joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determines the downlink information sent to the J user equipments; Wherein, the product of the downlink channel information of any user equipment among the J user equipments and the J-1 pieces of precoding information corresponding to other J-1 user equipments that have a common null space is 0, so as to eliminate the presence of the base station. When the other J-1 user equipments in the common null space send downlink information, the base station interferes with sending downlink information to any user equipment in the J user equipments. 2. The method according to claim 1, wherein before the base station acquires J null spaces corresponding to J user equipments, it further comprises: The base station obtains the null spaces of Q user equipments, and obtains Q null spaces; The base station determines that J null spaces exist in the Q null spaces, where J≤Q, and where Q is an integer. 3. The method according to claim 2, wherein the base station obtaining the null spaces of Q user equipments comprises: The base station receives channel state information sent by the Q user equipments; The base station determines the null spaces of the Q user equipments according to the channel state information. 4. The method according to claim 3, wherein the channel state information includes any of the following: said null space; difference information of the null space; An identifier of a null space codeword corresponding to a quantized null space. 5. The method according to any one of claims 1 to 4, wherein the base station performs joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determines The downlink information sent to the J user equipments includes: According to formula (1), determine the downlink information sent to the jth user equipment among the J user equipments; Wherein, described formula (1) is: <mrow><msub><mi>Y</mi><mi>j</mi></msub><mo>=</mo><msub><mi>H</mi><mi>j</mi></msub><msub><mi>P</mi><mi>j</mi></msub><msub><mi>S</mi><mi>j</mi></msub><mo>+</mo><msub><mi>H</mi><mi>j</mi></msub><munderover><mi>&amp;Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>0</mn><mo>,</mo><mi>k</mi><mo>&amp;NotEqual;</mo><mi>j</mi></mrow><mrow><mi>J</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mi>P</mi><mi>k</mi></msub><msub><mi>S</mi><mi>k</mi></msub><mo>+</mo><msub><mi>N</mi><mi>j</mi></msub><mo>-</mo><mo>-</mo><mo>-</mo><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow> Wherein, Y _j represents the downlink information received by the jth user equipment, H _j represents the downlink channel information of the jth user equipment, P _j represents the jth user equipment in the joint precoding information Precoding information, the S _j represents the original downlink information of the jth user equipment, P _k represents the precoding information of the kth user equipment among the J-1 user equipments in the joint precoding information, S _k represents the original downlink information of the k-th user equipment among the J-1 user equipments, the N _j represents the noise signal corresponding to the j-th user equipment, and j is 0 or a positive integer. 6. The method according to claim 5, wherein when said J=2, said j=0 or 1; When the j=0, the Y ₀ =H ₀ P ₀ S ₀ +H ₀ P ₁ S ₁ +N ₀ , the H ₀ P ₁ S ₁ =0; When the j=1, the Y ₁ =H ₁ P ₁ S ₁ +H ₁ P ₀ S ₀ +N ₁ , and the H ₁ P ₀ S ₀ =0. 7. A base station, characterized in that, comprising: An acquisition module, configured to acquire J null spaces corresponding to J user equipments, wherein, said J≥2, said J is an integer, and there are common J-1 null spaces corresponding to any J-1 user equipments A null space, the number of the common null spaces is J; A precoding module, configured to determine J pieces of precoding information corresponding to the J user equipments according to the J common null spaces, and determine joint precoding of the J user equipments according to the J pieces of precoding information information; A determining module, configured to perform joint precoding on the original downlink information sent to the J user equipments according to the joint precoding information, and determine the downlink information sent to the J user equipments; Wherein, the product of the downlink channel information of any user equipment among the J user equipments and the J-1 pieces of precoding information corresponding to other J-1 user equipments that have a common null space is 0, so as to eliminate the presence of the base station. When the other J-1 user equipments in the common null space send downlink information, the base station interferes with sending downlink information to any user equipment in the J user equipments. 8. The base station according to claim 7, wherein the acquiring module is further configured to: acquire the null spaces of Q user equipments before acquiring the J null spaces corresponding to the J user equipments, and obtain Q It is determined that there are J null spaces in the Q null spaces, the J≤Q, and the Q is an integer. 9. The base station according to claim 8, wherein the acquiring module is further specifically configured to: receiving channel state information sent by the Q user equipments; Determine the null spaces of the Q user equipments according to the channel state information. 10. The base station according to claim 9, wherein the channel state information includes any of the following: said null space; difference information of the null space; An identifier of a null space codeword corresponding to a quantized null space. 11. The base station according to any one of claims 7 to 10, wherein the determining module is specifically used for: According to formula (1), determine the downlink information sent to the jth user equipment among the J user equipments; Wherein, described formula (1) is: <mrow><msub><mi>Y</mi><mi>j</mi></msub><mo>=</mo><msub><mi>H</mi><mi>j</mi></msub><msub><mi>P</mi><mi>j</mi></msub><msub><mi>S</mi><mi>j</mi></msub><mo>+</mo><msub><mi>H</mi><mi>j</mi></msub><munderover><mi>&amp;Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>0</mn><mo>,</mo><mi>k</mi><mo>&amp;NotEqual;</mo><mi>j</mi></mrow><mrow><mi>J</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mi>P</mi><mi>k</mi></msub><msub><mi>S</mi><mi>k</mi></msub><mo>+</mo><msub><mi>N</mi><mi>j</mi></msub><mo>-</mo><mo>-</mo><mo>-</mo><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow> Wherein, Y _j represents the downlink information received by the jth user equipment, H _j represents the downlink channel information of the jth user equipment, P _j represents the jth user equipment in the joint precoding information Precoding information, the S _j represents the original downlink information of the jth user equipment, P _k represents the precoding information of the kth user equipment among the J-1 user equipments in the joint precoding information, S _k represents the original downlink information of the k-th user equipment among the J-1 user equipments, the N _j represents the noise signal corresponding to the j-th user equipment, and j is 0 or a positive integer. 12. The base station according to claim 11, wherein when the J=2, the j=0 or 1; When the j=0, the Y ₀ =H ₀ P ₀ S ₀ +H ₀ P ₁ S ₁ +N ₀ , the H ₀ P ₁ S ₁ =0; When the j=1, the Y ₁ =H ₁ P ₁ S ₁ +H ₁ P ₀ S ₀ +N ₁ , and the H ₁ P ₀ S ₀ =0.