CN106712820A - Self-interference suppression multi-stream diversity BD precoding method and device - Google Patents
Self-interference suppression multi-stream diversity BD precoding method and device Download PDFInfo
- Publication number
- CN106712820A CN106712820A CN201611137027.0A CN201611137027A CN106712820A CN 106712820 A CN106712820 A CN 106712820A CN 201611137027 A CN201611137027 A CN 201611137027A CN 106712820 A CN106712820 A CN 106712820A
- Authority
- CN
- China
- Prior art keywords
- user
- matrix
- interference
- diversity
- multithread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a self-interference suppression multi-stream diversity BD precoding method and device. The method comprises the steps that a base station acquires all user channel matrixes; the interference matrix of each user receiving antenna is determined to construct the zero space orthogonal basis of all receiving antennas of users; the self-interference suppression equivalent channel matrix of each user is constructed, and then the multi-stream diversity BD precoding and receiving decoding matrix of each user is constructed; multi-stream diversity BD precoding is carried out on original signals sent by a base station to each user, and added signals are transmitted from the base station; users process the received signals through a corresponding received decoding matrix; and data streams received by each user are merged, and original transmission data of the user are estimated. According to the invention, the technical problem of self-interference between receiving end antennas in a MU-MIMO system is solved; multi-user interference is eliminated; self-interference of an equivalent channel is suppressed; multiple data streams are merged to increase the spatial diversity gain; the reliability is improved; and the method and device are used for anti-interference in the field of wireless communication.
Description
Technical field
The invention belongs to wireless communication technology field, more particularly to a kind of multi-user's multiple-input and multiple-output (abbreviation MU-
MIMO) the precoding in system down link, multithread diversity BD method for precoding and device that specifically a kind of self-interference suppresses,
For the anti-interference of wireless communication field.
Background technology
MU-MIMIO systems can send multichannel spatial reuse on identical time and frequency resource block to multiple users
Signal, while the benefit of the cancellation multi-user interference that acquisition power system capacity high and space division multiple access treatment bring.Within the system,
Due to base station (abbreviation BS) while to multiple user's sending signals, multi-user interference (abbreviation MUI) will necessarily be introduced, and because connect
Receive antenna to belong to and cannot carry out collaborative process between different users, user, so needing to carry out sending signal at BS ends pre-
Coding suppresses or is completely eliminated MUI.
The precoding of MU-MIMO is divided into nonlinear precoding and linear predictive coding from type.Nonlinear precoding is for example dirty
Paper code (abbreviation DPC), because complexity is high, is difficult application in practice although optimal systematic function can be realized.Line
Property precoding such as BD precodings realize the systematic function of suboptimum, but due to relatively low complexity, therefore in MU-MIMO systems
It is widely adopted in system.BD method for precoding can utilize the channel condition information (CSI) of all users, and MUI is completely eliminated, but
Do not consider that itself is disturbed.
BD precodings widely used in existing MU-MIMO system, BS ends obtain the channel matrix of all users first；So
Construction expects the interference matrix of user afterwards, and the pre-coding matrix and decoding matrix for expecting user are obtained according to interference matrix；Base station
Precoding is carried out to the primary signal for sending using the pre-coding matrix for obtaining, the signal after precoding is gone out by Base Transmitter
Go；User is received signal and is decoded using decoding matrix, obtains primary signal.Because BD precodings expect user in construction
The channel matrix of other users is only considered during interference channel matrix, does not consider to expect the interference between user's its own antenna, because
This causes bit error rate performance to decline when multiplex data stream is sent.
Secondly as the equivalent channel gain of different data streams is different in BD precodings, if sending multichannel identical data
Stream, receiving terminal is merged to multiplex data stream, and bit error rate performance depends on worst equivalent channel situation, therefore does not consider hair
The situation of multichannel identical data flow is sent to improve the reliability of system.
BD method for precoding of the prior art only considered MUI interference when interference channel is constructed, and consider certainly
Self-interference between body antenna, when user has multiplex data stream, bit error rate performance is poor.
The content of the invention
When the purpose of the present invention is directed to BD method for precoding of the prior art in the presence of multiplex data stream is sent, the bit error rate
A kind of problem of poor-performing, there is provided the multithread diversity BD precodings that self-interference with more preferable error rate of system performance suppresses
Method and apparatus.
The present invention is the multithread diversity BD method for precoding that a kind of self-interference suppresses, it is characterised in that include following step
Suddenly：
Step 1：All subscriber channel matrixes are determined, base station obtains the down channel matrix of each user, it is determined that institute is useful
Family channel matrixHkIt is the down channel matrix of user k, k=1,2 ..., K, K are in system
Number of users, []TThe transposition of representing matrix；
Step 2：Determine the kernel orthogonal basis of user's reception antenna, the interference square of every reception antenna of each user is constructed first
Battle array, then calculates the kernel orthogonal basis of the interference matrix of every reception antenna of each user, so as to obtain all reception antennas of each user
Kernel orthogonal basis, by taking user k as an example, the interference matrix of i-th reception antenna of user k is
WhereinIt is the down channel matrix H of family kkRemove the channel matrix after the i-th row, i.e., the interference matrix both includes other users
Channel condition information, and comprising own channel status information；
Step 3：Construction equivalent channel matrix, Linear precoding matrix and reception decoding matrix, according to all of each user
The kernel orthogonal basis of the interference matrix of reception antenna and the down channel matrix of user, the self-interference for constructing each user suppress
Equivalent channel matrix, and equivalent channel matrix is suppressed according to self-interference, construct Linear precoding matrix and the reception of each user
Decoding matrix；
Step 4：Multithread diversity BD precodings are carried out to base station sending signal, using the Linear precoding matrix of construction to each
The sending signal of individual user carries out multithread diversity BD precodings, and the signal after multithread diversity BD precodings is added, and passes through
Base station end antenna is launched；
Step 5：User's docking is collected mail and number enters row decoding, merges and estimate, expects user to the signal that is received from base station
Decoding matrix is received with corresponding multithread diversity BD to be processed, the expectation that multithread diversity BD is received after decoding matrix treatment is used
The data flow at family is merged, and space diversity gain is provided using a plurality of data flow, estimates originally transmitted data.
The multithread diversity BD pre-coding apparatus that of the invention or a kind of self-interference suppresses, it is characterised in that at signal
Reason flow is connected with turn：Channel matrix acquisition module, kernel orthogonal basis constructing module, pre-coding matrix and reception decoding square
Battle array constructing module, precoding processing module, reception signal processing module, each module are described below：
Channel matrix acquisition module, the channel matrix for obtaining all users, is input into the channel matrix for each user,
It is output as the channel matrix of all users；
Kernel orthogonal basis constructing module, for obtaining each user's reception antenna kernel orthogonal basis, is input into as useful
The channel matrix at family, is output as the kernel orthogonal basis of all reception antennas of each user；
Pre-coding matrix and receive decoding matrix constructing module, for obtain user multithread diversity BD pre-coding matrixes and
Multithread diversity BD receives decoding matrix, is input into the kernel orthogonal basis of all reception antennas for each user, is output as each user
Multithread diversity BD pre-coding matrixes and multithread diversity BD receive decoding matrix；
Precoding processing module, for the primary signal of all users will to be sent to using described pre-coding matrix construction
The pre-coding matrix of mould module structure carries out multithread diversity BD precoding processings, and by after all user's multithread diversity BD precodings
Signal sum up, launched by base station end, be input into be sent to the primary signal of user, be output as multithread diversity BD
Signal after precoding；
Signal processing module is received, for receiving connecing for decoding matrix treatment user using the above-mentioned multithread diversity BD for trying to achieve
The collection of letters number, and the customer traffic obtained after multithread diversity BD reception decoding matrix treatment is merged, estimate initial data.
The signal that the input of signal processing module is received for user by antenna is received, base station is output as and is sent to the original of expectation user
Signal is estimated.
Compared with prior art, the present invention has the advantage that：
1. the main purpose of existing BD method for precoding solves in construction interference matrix and expects to use to eliminate multi-user interference
During the pre-coding matrix at family, only consider that other users to expecting the interference of user, i.e., only include other users in interference matrix
Channel condition information, and the present invention, while introducing the channel condition information for expecting user, constructs every when interference matrix is constructed
The interference matrix of reception antenna, therefore the present invention effectively eliminates inter-user interference, while eliminating expectation user itself day again
Self-interference between line, reduces the bit error rate.
2. existing BD method for precoding is when user has multiplex data stream, the equivalent channel gain gap between different data streams
Than larger, error rate of system performance depends on worst equivalent channel situation, therefore considers that folding improves system reliability
Property.The present invention by eliminating user antenna between self-interference balance the equivalent channel gain of different data streams, and sent out by base station
Send multichannel identical data flow, the method that user terminal carries out multiplex data stream merging to increased space diversity gain, improve and be
System reliability.
Brief description of the drawings
Fig. 1 is MU-MIMO system down link structure schematic diagram；
Fig. 2 is the FB(flow block) of method for precoding of the present invention；
Fig. 3 is the composition schematic diagram of pre-coding apparatus of the present invention；
Fig. 4 is the composition schematic diagram of kernel orthogonal basis constructing module in pre-coding apparatus of the present invention；
Fig. 5 is the composition schematic diagram of reception signal processing module in pre-coding apparatus of the present invention；
Fig. 6 be it is of the invention with existing BD method for precoding about the Performance comparision curve map of wrong bitrate.
Specific embodiment
Below in conjunction with the accompanying drawings to the detailed description of the invention
Embodiment 1
Precoding in existing MU-MIMO system mainly has nonlinear precoding and the major class of linear predictive coding two.Wherein, it is non-
Linear predictive coding can provide more preferably systematic function, but because implementation complexity is high, range of application is limited.Linear predictive coding with
Nonlinear precoding is compared, due to lower complexity, although showing slightly worse in aspect of performance, widely should still obtain
With such as BD precodings.However, block diagonalization BD precodings only eliminate the interference between multi-user, itself day is not considered
Self-interference between line, when user has multiplex data stream, bit error rate performance declines.The present invention launches research and creates with regard to this problem
Newly, the multithread diversity BD method for precoding that self-interference suppresses is proposed, by constructing during interference matrix, introduces own channel state letter
Breath, while multi-user interference is eliminated, it is suppressed that self-interference between antenna.And multichannel same data stream is sent by base station end
Mode, the merging of multichannel data is carried out in user terminal, increased space diversity gain, improves the reliability of system.
The present invention is the multithread diversity BD method for precoding that a kind of self-interference suppresses, and referring to Fig. 1, Fig. 1 is MU-MIMO system
Down link structure schematic diagram.A base station is simultaneously for K user provides service in system.There is N base stationTRoot transmitting antenna, uses
Family k has NRkRoot reception antenna, system meets NT≥NR, whereinI.e. Base Transmitter antenna number is more than or equal to all
User's reception antenna number sum.The signal that base station sends be after all user's precodings signal plus and, base station is sent to user's
Data fluxion is equal with the reception antenna number of user.According to the channel reciprocity under tdd mode, base station can know all users
Channel matrix.The channel matrix of user k is designated as Hk, therefore the signal that user k is received is
xkThe primary signal of user k, F are sent to for base stationkIt is the pre-coding matrix of user k, nkIt is zero-mean and the additivity of unit variance
White Gaussian noise.Equal sign the right Section 1 represents the useful signal of user k in above formula, and equal sign the right Section 2 represents MUI.
Referring to Fig. 2, the multithread diversity BD method for precoding that self-interference of the present invention suppresses includes having the following steps：
Step 1：Determine all subscriber channel matrixes.
Base station obtains the down channel matrix of each user, determines all subscriber channel matrixesHk
It is the down channel matrix of user k, k=1,2 ..., K, K are the number of users in system, []TThe transposition of representing matrix.
Base station obtains the channel condition information of user, can carry out pre-encode operation in base station end using the information, reduces
User terminal detection operation, reduces the hardware complexity of user terminal.
Step 2：Determine the kernel orthogonal basis of user's reception antenna.
The interference matrix of every reception antenna of each user is constructed first；Then the interference of every reception antenna of each user is calculated
The kernel orthogonal basis of matrix, so as to obtain the kernel orthogonal basis of all reception antennas of each user.By taking user k as an example, user k
The interference matrix of i-th reception antenna isWhereinIt is descending for family k
Channel matrix HkRemove the channel matrix after the i-th row, i.e., the interference matrix both includes other users channel condition information, includes again
Own channel status information.
The interference matrix of every reception antenna of each user of present invention construction, introduces expectation user's own channel state letter
Breath, it is ensured that required kernel orthogonal basis eliminate multi-user interference while, also eliminate expectation user's its own antenna between from
Interference.Expect each user in user i.e. system, user when signal is received as user is expected, for interference use by other users
Family.In the present invention, each user in system, can participate in calculating the kernel orthogonal basis of its own antenna as user is expected.
Step 3：Construction equivalent channel matrix, Linear precoding matrix and reception decoding matrix.
The interference matrix of every reception antenna of each user is merged, the interference of each all reception antennas of user is formed
Matrix, the kernel orthogonal basis of the interference matrix according to all reception antennas of user and the down channel matrix of user, construction are every
The self-interference of individual user suppresses equivalent channel matrix, and suppresses equivalent channel matrix according to self-interference, constructs many of each user
Flow point collection BD pre-coding matrixes and multithread diversity BD receive decoding matrix, and the self-interference of each user suppresses equivalent channel matrix letter
Claim equivalent channel matrix, multithread diversity BD pre-coding matrix abbreviation Linear precoding matrixes, multithread diversity BD receives decoding matrix
Referred to as receive decoding matrix.
Construction equivalent channel matrix, Linear precoding matrix and reception decoding matrix, specifically include：
3.1：By the kernel orthogonal basis and the channel matrix structure of user k of the interference matrix of all reception antennas of user k
Make self-interference and suppress equivalent channelIt is signal after user's precoding etc. that wherein self-interference suppresses equivalent channel
The pseudo channel that passes through of effect, and non-actual existence channel.
3.2：Equivalent channel is suppressed to above-mentioned self-interference and makees singular value decomposition, obtainedWhereinIt isLeft singular vector matrix,It isSingular value matrix,It isRight singular vector matrix,It is the corresponding right singular vector matrix of non-zero singular value,It is the corresponding right singular vector matrix of zero singular value.
The pre-coding matrix of user k takesWhereinExpression takesBefore
NRkArrange, the reception decoding matrix of user k isWhereinExpression takesPreceding NRkRow.
The purpose of singular value decomposition is to obtain the left and right singular matrix that self-interference suppresses equivalent channel, so that it is determined that user
Pre-coding matrix and reception decoding matrix.
3.3：Repeat step 3.1 and step 3.2, it is determined that the pre-coding matrix of all users in addition to user k and reception
Decoding matrix.
Due to constructing interference matrix to every reception antenna of user in step 2, every reception antenna of user itself is obtained
Kernel orthogonal basis, therefore in this step construct equivalent channel realize self-interference suppression.
Step 4：Multithread diversity BD precodings are carried out to base station sending signal.
Multithread diversity BD precodings are carried out to the sending signal of each user using the Linear precoding matrix of construction, to many
Signal after flow point collection BD precodings is added, and is launched by base station end antenna, is specifically included：
4.1：Precoding is carried out to the sending signal of each user using the Linear precoding matrix constructed in step 3：Tool
Body is the primary signal premultiplication multithread diversity BD pre-coding matrixes that user is sent to base station, and by taking user k as an example, user k is carried out
Signal after multithread diversity BD precodings is expressed as Fkxk, complete the multithread diversity BD precodings of each user.
4.2：Base station sums up to the signal after all user's multithread diversity BD precodings, and is sent out by base station end antenna
It is shot out, is expressed asX is base station transmission including the signal after all user's multithread diversity BD precodings, system
In each with the signal can be received per family.
Because base station needs to be communicated with multiple users simultaneously, institute of the signal that base station sends comprising base station service is useful
The information at family, so system has been automatically introduced into the interference between multi-user, in order to eliminate these multi-user interferences, it is necessary to using base
Standing carries out multithread diversity BD precoding processings to the primary signal for being sent to all users.
Step 5：User's docking collection of letters number enters row decoding, merges and estimate.
User terminal is expected to the signal by base station multithread diversity BD precoding processings that receives, with same multithread diversity BD
The corresponding multithread diversity BD of pre-coding matrix receives decoding matrix and enters row decoding treatment, and multithread diversity BD is received at decoding matrix
Data flow after reason is merged, and space diversity gain is provided using a plurality of data flow, estimates originally transmitted data.
Because the present invention design precoding when consider reception antenna between influence, constructed for every reception antenna
The interference matrix of every reception antenna of each user, eliminates self-interference between antenna.When user has a plurality of data flow, different data streams
Equivalent channel gain obtained active balance, therefore, it is possible to utilize folding, a plurality of data flow of user is merged,
A plurality of data flow provides space diversity gain, and then also improves the reliability of MU-MIMO system.
Multithread diversity BD method for precoding of the invention is solved compared with existing BD method for precoding in construction interference matrix
When expecting the pre-coding matrix of user, other users are not only included in the interference matrix of every reception antenna of each user of the invention
Channel condition information, while introducing the channel condition information for expecting user, construction expects the interference square of every reception antenna of user
Battle array, therefore the present invention effectively eliminates inter-user interference, while eliminating self-interference between expectation user's its own antenna again.
Embodiment 2
The multithread diversity BD method for precoding that self-interference suppresses determines user's reception antenna with embodiment 1 wherein in step 2
Kernel orthogonal basis, specifically include：
2.1：Construct i-th interference matrix of reception antenna of any user kShould
Matrix had both included the channel condition information of other users, and comprising own channel status information.
2.2：The kernel orthogonal basis of i-th interference matrix of reception antenna of user k is solved, it is rightCarry out singular value
Decompose, obtainWhereinIt isLeft singular vector matrix,It isIt is strange
Different value matrix,It isRight singular vector matrix,It is the corresponding right singular vector square of non-zero singular value
Battle array,It is the corresponding right singular vector matrix of zero singular value, from the knowledge of matrix theory,ConstituteKernel
Orthogonal basis.
2.3：Solve the kernel of the interference matrix of all reception antennas of user k, all receptions day of traverse user k
Line, repeat step 2.1 and step 2.2, the kernel orthogonal basis for obtaining the interference matrix of all reception antennas of user k isWherein NRkIt is the reception antenna number of user k.
2.4：Repeat step 2.1, step 2.2 and step 2.3, travel through all users, construct the every reception of all users
The interference matrix of antenna, all users are to include all users beyond user k and user k, try to achieve all of each user and connect
Receive the kernel orthogonal basis of antenna interference matrix.
The multithread diversity BD pre-coding matrixes that the present invention is calculated using every reception antenna interference matrix of each user
Fk, multi-user interference is eliminated, while greatly inhibiting the self-interference of equivalent channel, when user has multiplex data stream, have
Effect reduces the bit error rate of system.
Embodiment 3
The multithread diversity BD pre-coding apparatus that of the invention or a kind of self-interference suppresses, referring to Fig. 3, according to signal transacting stream
Journey is connected with turn：Channel matrix acquisition module, kernel orthogonal basis constructing module, pre-coding matrix and reception decoding matrix structure
Modeling block, precoding processing module, reception signal processing module, each module are described below：
Channel matrix acquisition module, the channel matrix for obtaining all users, is input into the channel matrix for each user,
It is output as all subscriber channel matrixes.The instruction of the up-link received by base station for tdd systems, subscriber channel matrix
Practice sequence or pilot frequency sequence to obtain；For frequency division duplex system, subscriber channel matrix is obtained by feeding back.
Kernel orthogonal basis constructing module, for obtaining each user's reception antenna kernel orthogonal basis, is input into as useful
The channel matrix at family, is output as the kernel orthogonal basis of all reception antennas of each user.
Pre-coding matrix and receive decoding matrix constructing module, for obtain user multithread diversity BD pre-coding matrixes and
Multithread diversity BD receives decoding matrix, is input into the kernel orthogonal basis of all reception antennas for each user, is output as the user
Multithread diversity BD pre-coding matrixes and multithread diversity BD receive decoding matrix.Wherein pre-coding matrix is used for what base station was sent
Primary signal carries out multithread diversity BD precoding processings, and receive decoding matrix carries out multithread diversity BD for user's docking collection of letters number
Decoding is processed.
Precoding processing module, for the primary signal of all users will to be sent to using described pre-coding matrix construction
The pre-coding matrix of module structure carries out multithread diversity BD precoding processings, and by after all user's multithread diversity BD precodings
Signal is summed up, and is launched by base station end, is input into be sent to the primary signal of user, is output as multithread diversity BD pre-
Signal after coding.Base station sending signal includes all user profile, increases power system capacity.
Signal processing module is received, for receiving connecing for decoding matrix treatment user using the above-mentioned multithread diversity BD for trying to achieve
The collection of letters number, and the customer traffic obtained after multithread diversity BD reception decoding matrix treatment is merged, estimate initial data.
The signal that the input of signal processing module is received for user by antenna is received, base station is output as and is sent to the original of expectation user
Signal is estimated.
Embodiment 4
The composition of the multithread diversity BD pre-coding apparatus that self-interference suppresses with embodiment 3, referring to Fig. 4, wherein kernel just
Base constructing module is handed over to be connected with interference matrix construction submodule and singular value decomposition submodule, each submodule according to signal processing flow
Block is described below：
Interference matrix constructs submodule, for the interference letter of the every reception antenna according to the channel matrix structuring user's for obtaining
Road matrix, the channel condition information of all users obtained by being input into as channel matrix acquisition module, is output as user's reception antenna
Interference matrix, by taking any user k as an example, the interference matrix of i-th reception antenna of user k is
See from above formula, the building method of the interference matrix of every reception antenna of each user is different from tradition BD precodings
Method, the interference matrix had both included that the channel matrix of the other users in addition to user k was used for eliminating multi-user interference, and comprising use
Family k channel condition informations of itself are used for eliminating self-interference between its own antenna.
Singular value decomposition submodule, singular value decomposition is carried out for the interference matrix to every reception antenna of user, is obtained
The kernel orthogonal basis of every reception antenna of each user, and then it is orthogonal to obtain the kernel of all reception antennas of each user
Base, is input into the interference matrix of the every reception antenna of each user obtained for interference matrix construction submodule, is output as to that should do
Disturb the kernel orthogonal basis of matrix.
By taking i-th interference matrix of reception antenna of user k as an example, singular value decomposition is carried out to it, obtain user k i-th
The kernel orthogonal basis of the interference matrix of reception antennaThe interference matrix of all reception antennas of user k can similarly be obtained
Kernel orthogonal basisFor further structuring user's self-interference suppress equivalent channel matrix and
Multithread diversity BD pre-coding matrixes are laid a good foundation.
Embodiment 5
The composition of the multithread diversity BD pre-coding apparatus that self-interference suppresses with embodiment 3-4, referring to Fig. 5, wherein receiving letter
Number processing module is connected with signal interpretation submodule, data stream merging submodule and signal decision in turn according to signal processing flow
Submodule, each submodule is described below：
Signal interpretation submodule, the reception signal for decoding user, is input into the reception signal for user, is output as decoding
Multiplex data stream afterwards, user utilizes and receives decoding matrix DkDock the collection of letters number enters row decoding, signal after being decodedData flow after the decoding received for user k, LkTo be sent to the number of data streams of user k,
ykIt is the reception signal of user k.
Data stream merging submodule, by the L of the user k after decodingkData stream is merged, and is input into as user k is decoded
Multiplex data stream afterwards, is output as the merging signal after multiplex data stream merges.
Folding can using etc. than merging method, maximum-ratio combing method, selection combining method, or several conjunctions
And the independent assortment of method.
Signal decision submodule, makes decisions to the signal after merging, is input into the merging signal for user, is output as base station
It is sent to the estimation of the primary signal of user.
A more complete example is given below, the present invention is described in more detail：
Embodiment 6
Self-interference suppress multithread diversity BD method for precoding with embodiment 1-2, as shown in Fig. 2 precoding of the invention
Method, including step：
Step 1：All subscriber channel matrixes are determined, base station obtains the down channel matrix of each user, it is determined that institute is useful
Family channel matrixFor tdd systems, the training of the up-link received by base station or
Pilot frequency sequence is obtained；For frequency division duplex system, then can be obtained by feeding back；HkIt is the down channel matrix of user k, k
=1,2 ..., K, K are the number of users in system, []TThe transposition of representing matrix.
Step 2：Determine the kernel orthogonal basis of user's reception antenna, first, construct the interference square of each every reception antenna of user
Battle array, then calculates the kernel orthogonal basis of the interference matrix of every reception antenna of each user, so as to obtain all reception antennas of each user
Kernel orthogonal basis, by taking user k as an example, the interference matrix of i-th reception antenna of user k is
WhereinIt is the down channel matrix H of family kkRemove the channel matrix after the i-th row, i.e., the interference matrix both includes other users
Channel condition information, and comprising own channel status information；It is specific as follows step by step：
2.1：Construct i-th interference matrix of reception antenna of any user kThis
Interference matrix in invention had both included the channel condition information of other users, and comprising user's k own channel status informations.
2.2：The kernel orthogonal basis of i-th interference matrix of reception antenna of user k is solved, it is rightCarry out singular value
Decompose, obtainWhereinIt isLeft singular vector matrix,It isIt is strange
Different value matrix,It isRight singular vector matrix,It is the corresponding right singular vector square of non-zero singular value
Battle array,It is the corresponding right singular vector matrix of zero singular value, from the knowledge of matrix theory,ConstituteIt is zero empty
Between orthogonal basis.
2.3：Solve the kernel of the interference matrix of all reception antennas of user k, all receptions day of traverse user k
Line, repeat step 2.1 and step 2.2, obtain the interference matrix of all reception antennas of user k kernel it is orthogonal hand over base beWherein NRkIt is the reception antenna number of user k.
2.4：Repeat step 2.1, step 2.2 and step 2.3, travel through all users, user of the construction in addition to user k
The every interference matrix of reception antenna, tries to achieve the kernel orthogonal basis of all reception antenna interference matrix of each user.User k
And its user in addition constitutes all users.
Step 3：The kernel orthogonal basis of the interference matrix of all reception antennas according to each user and the descending letter of user
Road matrix, the self-interference for constructing each user suppresses equivalent channel matrix, and suppresses equivalent channel matrix, construction according to self-interference
The multithread diversity BD pre-coding matrixes and multithread diversity BD of each user receive decoding matrix；It is specific as follows step by step：
3.1：The self-interference of structuring user's k suppresses equivalent channel matrix.Channel matrix and the institute of user k using user k
The self-interference that the null space matrix for having antenna obtains user k suppresses equivalent channel matrixWhereinIt is the null space matrix of all reception antennas of user k；WillLaunch, be expressed as
Form
Self-interference suppresses the blocking diagonal form of equivalent channel matrix, i.e., the building method of interference matrix effectively disappears in step 2
Except equivalent channel self-interference, wherein hkIt is HkRow k.
3.2：Determine that the multithread diversity BD pre-coding matrixes and multithread diversity BD of user k receive decoding matrix.It is rightEnter
Row SVD is decomposedWhereinIt isLeft singular vector matrix,It isSingular value matrix,It isRight singular vector matrix；It is the corresponding right singular vector matrix of non-zero singular value,It is zero strange
The corresponding right singular vector matrix of different value；The pre-coding matrix of user k takesWherein
Expression takesPreceding NRkRow；The receiving matrix of user k isWhereinExpression takes's
Preceding NRkRow.
3.3：Repeat step 3.1 and step 3.2, travel through all users, determine the multithread diversity BD precodings of all users
Matrix and multithread diversity BD receive decoding matrix.
Step 4：To base station sending signal precoding.
4.1：Multithread diversity BD is carried out to the sending signal of each user using the Linear precoding matrix constructed in step 3
Precoding：Specifically to the signal premultiplication multithread diversity BD pre-coding matrixes of user, by taking user k as an example, user's k multithread diversity BD
Signal after precoding is expressed as Fkxk。
4.2：Base station is added to the signal after all user's multithread diversity BD precodings, and is sent out by base station end antenna
It is shot out, is expressed asX is signal after the multithread diversity BD precodings that base station sends.
Step 5：User terminal is to the signal after the base station multithread diversity BD precodings that receive with corresponding multithread diversity BD
Receive decoding matrix to be processed, the data flow that will receive the user after decoding matrix treatment is merged, and estimates user's
Originally transmitted data.It is specific as follows step by step：
5.1：The reception signal that decoding matrix processes user is received using the multithread diversity BD of the user of above-mentioned acquisition, is obtained
Signal after decodingData flow after the decoding received for user k, LkFor base station is sent to user k
Data flow number, ykFor the signal that user k is received.
5.2：By the L of the user k after decodingkData stream is merged, it is assumed that the weighting per circuit-switched data stream when merging
It is plural number { ω to be worthn, n=1,2 ..., Lk, the signal after weighting merges is expressed asFolding can be used
Deng than merging method, maximum-ratio combing method, selection combining method, or several merging method independent assortments.
5.3：To the signal after mergingMake decisions, obtain to base station the estimation of the initial data for being sent to userIt is complete
The multithread diversity BD precodings suppressed into self-interference and reception process, obtain accuracy rate signal higher.
The multithread diversity BD precoding active balances of the invention equivalent channel gain of different data streams, it is suppressed that equivalent
Channel self-interference, multichannel identical data flow is sent by base station, and user terminal carries out the merging of multiplex data stream, increased space
Diversity gain, improves system reliability.
Embodiment 7
The multithread diversity BD method for precoding and device of self-interference suppression are done certainly to of the invention below with embodiment 1-6
The multithread diversity BD method for precoding and the wrong bitrate performance of BD method for precoding of the prior art for disturbing suppression are imitated
Really compare.
Fig. 6 is the multithread diversity BD method for precoding and BD precoding sides of the prior art that self-interference of the invention suppresses
The comparing analogous diagram of the wrong bitrate performance of method.Transverse axis represents the received signal to noise ratio of user, and the longitudinal axis represents wrong bitrate.
Simulated conditions are：MU-MIMO system, there is a base station in system, antenna for base station number is 6, the reception of each user
Antenna number is 2, and number of users is 3, and channel model is modeled as perfect list footpath rayleigh fading channel, using Monte-Carlo Simulation side
Method, participates in the multithread diversity BD method for precoding and tradition BD method for precoding that have self-interference of the invention to suppress of emulation.Hair
The number of delivering letters is modulated using QPSK, and the bit error rate is the statistical average bit error rate of many experiments.
As shown in fig. 6, the multithread diversity BD method for precoding of self-interference suppression of the invention and traditional BD precoding sides
Method is compared, and has obvious advantage in performance of BER, when the bit error rate is 10-3When, the multithread that self-interference of the invention suppresses
Diversity BD method for precoding obtains the gain of about 1.5dB compared with traditional BD method for precoding.And with received signal to noise ratio
Increase, the multithread diversity BD method for precoding that self-interference of the invention suppresses is believed relative to traditional BD method for precoding in identical
Make an uproar than under, bit error rate is lower, that is to say, that the advantage of bit error rate performance is more obvious.Carried out with technical scheme many
Flow point collection BD precoding processings, can make system obtain more preferably error performance, and improve the transmission reliability of system.
In sum, self-interference disclosed by the invention suppresses multithread diversity BD method for precoding and device, the method bag
Include：Base station obtains the down channel matrix of each user, it is determined that total subscriber channel matrix；Base station end determines that each user receives day
The kernel orthogonal basis of the interference channel matrix of line；The kernel orthogonal basis of all reception antenna interference matrix according to user with
The down channel matrix of user, the self-interference for constructing each user suppresses equivalent channel matrix, and according to equivalent channel matrix, structure
The multithread diversity BD pre-coding matrixes and multithread diversity BD for making each user receive decoding matrix；All users are sent to base station
Primary signal carry out multithread diversity BD precodings, and the signal after precoding is added, launch from base station end antenna；With
Family end receives decoding matrix reception processing to the signal for receiving with corresponding multithread diversity BD, after each user's reception processing
Data flow is merged, and estimates originally transmitted data.The multithread diversity BD precoding sides that the self-interference that the present invention is provided suppresses
Method, solves the technical problem of self-interference between receiving terminal antenna in MU-MIMO system, while eliminating multi-user interference, greatly
Inhibit the self-interference of equivalent channel, and merging by multiplex data stream increased space diversity gain, improve system
Reliability.For the anti-interference of wireless communication field.
Claims (5)
1. the multithread diversity BD method for precoding that a kind of self-interference suppresses, it is characterised in that including having the following steps：
Step 1：Determine all subscriber channel matrixes, base station obtains the down channel matrix of each user, determine all user's letters
Road matrixHkIt is the down channel matrix of user k, k=1,2 ..., K, K are the user in system
Number, []TThe transposition of representing matrix；
Step 2：Determine the kernel orthogonal basis of user's reception antenna, the interference matrix of every reception antenna of each user constructed first,
Then the kernel orthogonal basis of the interference matrix of every reception antenna of each user is calculated, so as to obtain all reception antennas of each user
Kernel orthogonal basis, by taking user k as an example, the interference matrix of i-th reception antenna of user k is
WhereinIt is the down channel matrix H of family kkRemove the channel matrix after the i-th row, i.e., the interference matrix both includes other users
Channel condition information, and comprising own channel status information；
Step 3：Construction equivalent channel matrix, Linear precoding matrix and reception decoding matrix, according to all receptions of each user
The kernel orthogonal basis of the interference matrix of antenna and the down channel matrix of user, the self-interference for constructing each user suppress equivalent
Channel matrix, and equivalent channel matrix is suppressed according to self-interference, construct the Linear precoding matrix of each user and receive decoding
Matrix；
Step 4：Multithread diversity BD precodings are carried out to base station sending signal, each is used using the Linear precoding matrix of construction
The sending signal at family carries out multithread diversity BD precodings, the signal after multithread diversity BD precodings is added, by base station
End antenna is launched；
Step 5：User's docking is collected mail and number enters row decoding, merges and estimate, expects user to the signal that is received from base station with right
The multithread diversity BD for answering receives decoding matrix and is processed, and multithread diversity BD is received into the expectation user's after decoding matrix treatment
Data flow is merged, and space diversity gain is provided using a plurality of data flow, estimates originally transmitted data.
2. the multithread diversity BD method for precoding that self-interference according to claim 1 suppresses, it is characterised in that step 2 institute
The kernel orthogonal basis for determining user's reception antenna is stated, is specifically included：
2.1：Construct i-th interference matrix of reception antenna of any user kShould
Interference matrix had both included the channel condition information of other users, and comprising own channel status information；
2.2：The kernel orthogonal basis of i-th interference matrix of reception antenna of user k is solved, it is rightCarry out singular value decomposition,
ObtainWhereinIt isLeft singular vector matrix,It isSingular value
Matrix,It isRight singular vector matrix,It is the corresponding right singular vector matrix of non-zero singular value,It is the corresponding right singular vector matrix of zero singular value, from the knowledge of matrix theory,ConstituteKernel just
Hand over base；
2.3：Solve the kernel of the interference matrix of all reception antennas of user k, all reception antennas of traverse user k, weight
Step 2.1 and step 2.2 are answered, the kernel orthogonal basis for obtaining the interference matrix of all reception antennas of user k isWherein NRkIt is the reception antenna number of user k；
2.4：Repeat step 2.1, step 2.2 and step 2.3, travel through all users, construct the every reception antenna of all users
Interference matrix, try to achieve the kernel orthogonal basis of all reception antenna interference matrix of each user.
3. the multithread diversity BD pre-coding apparatus that a kind of self-interference suppresses, it is characterised in that connect successively according to signal processing flow
It is connected to：Channel matrix acquisition module, kernel orthogonal basis constructing module, pre-coding matrix and reception decoding matrix constructing module,
Precoding processing module, reception signal processing module, each module are described below：
Channel matrix acquisition module, the channel matrix for obtaining all users is input into the channel matrix for each user, output
It is the channel matrix of all users；
Kernel orthogonal basis constructing module, for obtaining each user's reception antenna kernel orthogonal basis, it is all users' to be input into
Channel matrix, is output as the kernel orthogonal basis of all reception antennas of each user；
Pre-coding matrix and reception decoding matrix constructing module, multithread diversity BD pre-coding matrixes and multithread for obtaining user
Diversity BD receives decoding matrix, is input into the kernel orthogonal basis of all reception antennas for each user, is output as many of each user
Flow point collection BD pre-coding matrixes and multithread diversity BD receive decoding matrix；
Precoding processing module, the primary signal for will be sent to all users constructs mould mould using described pre-coding matrix
The pre-coding matrix of block construction carries out multithread diversity BD precoding processings, and by the letter after all user's multithread diversity BD precodings
Number sum up, launched by base station end, be input into be sent to the primary signal of user, be output as multithread diversity BD and prelist
Signal after code；
Signal processing module is received, the reception for being received decoding matrix treatment user using the above-mentioned multithread diversity BD for trying to achieve is believed
Number, and the customer traffic obtained after multithread diversity BD reception decoding matrix treatment is merged, estimate initial data.Receive
The signal that the input of signal processing module is received for user by antenna, is output as base station and is sent to the primary signal for expecting user
Estimate.
4. the multithread diversity BD pre-coding apparatus that self-interference according to claim 3 suppresses, it is characterised in that described zero is empty
Between orthogonal basis constructing module according to signal processing flow be connected with interference matrix construction submodule and singular value decomposition submodule, respectively
Submodule is described below：
Interference matrix constructs submodule, for the interference channel square of the every reception antenna according to the channel matrix structuring user's for obtaining
Battle array, the channel condition information of all users obtained by being input into as channel matrix acquisition module is output as the interference of user's reception antenna
Matrix, by taking any user k as an example, the interference matrix of i-th reception antenna of user k is
Singular value decomposition submodule, singular value decomposition is carried out for the interference matrix to every reception antenna of user, obtains each
The kernel orthogonal basis of every reception antenna of user, and then the kernel orthogonal basis of all reception antennas of each user is obtained, it is defeated
Enter the interference matrix of every reception antenna of each user obtained for interference matrix construction submodule, be output as to should interference matrix
Kernel orthogonal basis.
5. the multithread diversity BD pre-coding apparatus that self-interference according to claim 3 suppresses, it is characterised in that the reception
Signal processing module is connected with signal interpretation submodule, data stream merging submodule and signal decision according to signal processing flow
Module, each submodule is described below：
Signal interpretation submodule, signal is received for decoding user, is input into as user receives signal, is output as many ways after decoding
According to stream, user utilizes and receives decoding matrix DkDock the collection of letters number enters row decoding, signal after being decoded
Data flow after the decoding received for user k, LkTo be sent to the number of data streams of user k, ykIt is the reception signal of user k；
Data stream merging submodule, by the L of the user k after decodingkData stream is merged, many after being input into as user k decodings
Circuit-switched data stream, is output as the merging signal after multiplex data stream merges；
Signal decision submodule, makes decisions to the signal after merging, is input into the merging signal for user, is output as base station transmission
To the estimation of the primary signal of user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611137027.0A CN106712820B (en) | 2016-12-12 | 2016-12-12 | Self-interference-suppressed multi-stream diversity BD precoding method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611137027.0A CN106712820B (en) | 2016-12-12 | 2016-12-12 | Self-interference-suppressed multi-stream diversity BD precoding method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106712820A true CN106712820A (en) | 2017-05-24 |
| CN106712820B CN106712820B (en) | 2020-02-07 |
Family
ID=58936644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611137027.0A Active CN106712820B (en) | 2016-12-12 | 2016-12-12 | Self-interference-suppressed multi-stream diversity BD precoding method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106712820B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417447A (en) * | 2018-04-27 | 2019-11-05 | 中兴通讯股份有限公司 | Method for precoding, base station and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227217A (en) * | 2008-02-04 | 2008-07-23 | 浙江大学 | Method and system for random wave packet forming based on multi-aerial receiver |
| CN102970103A (en) * | 2012-10-10 | 2013-03-13 | 西安交通大学 | Inter-user interference rejection pre-coding method for multi-user joint transmission |
| CN102025462B (en) * | 2010-12-16 | 2013-04-03 | 电子科技大学 | Block diagonalization precoding method used in MU-MIMO (Multiuser-Multiple Input Multiple Output) system down link |
| US9300501B2 (en) * | 2013-04-12 | 2016-03-29 | Broadcom Corporation | Spatial null creation using massive MIMO (M-MIMO) |
| US20160204914A1 (en) * | 2000-06-13 | 2016-07-14 | Comcast Cable Communications, Llc | Transmission of data using a plurality of radio frequency channels |
-
2016
- 2016-12-12 CN CN201611137027.0A patent/CN106712820B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160204914A1 (en) * | 2000-06-13 | 2016-07-14 | Comcast Cable Communications, Llc | Transmission of data using a plurality of radio frequency channels |
| CN101227217A (en) * | 2008-02-04 | 2008-07-23 | 浙江大学 | Method and system for random wave packet forming based on multi-aerial receiver |
| CN102025462B (en) * | 2010-12-16 | 2013-04-03 | 电子科技大学 | Block diagonalization precoding method used in MU-MIMO (Multiuser-Multiple Input Multiple Output) system down link |
| CN102970103A (en) * | 2012-10-10 | 2013-03-13 | 西安交通大学 | Inter-user interference rejection pre-coding method for multi-user joint transmission |
| US9300501B2 (en) * | 2013-04-12 | 2016-03-29 | Broadcom Corporation | Spatial null creation using massive MIMO (M-MIMO) |
Non-Patent Citations (1)
| Title |
|---|
| 刘祖军: "多小区多用户TDDMIMO下行链路干扰抑制预编码算法", 《通信学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417447A (en) * | 2018-04-27 | 2019-11-05 | 中兴通讯股份有限公司 | Method for precoding, base station and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106712820B (en) | 2020-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102983934B (en) | The method of multiuser mimo system neutral line precoding and device | |
| CN103312389B (en) | A kind of multiuser interference suppression method, terminal and base station | |
| Vaze et al. | Transmission capacity of ad-hoc networks with multiple antennas using transmit stream adaptation and interference cancellation | |
| CN101427485A (en) | Reduced complexity beam-steered MIMO OFDM system | |
| Ju et al. | Bi-directional use of spatial resources and effects of spatial correlation | |
| CN102546488B (en) | Interference elimination method based on effective channel parameter semi-orthogonal | |
| CN101442351B (en) | Multiuser MIMO system with combined block diagonalization and united channel analyze feedback algorithm | |
| CN105515625B (en) | Multiuser downstream transmission method based on receiving end spatial modulation | |
| CN110086515B (en) | Uplink precoding design method of MIMO-NOMA system | |
| CN101252383A (en) | System and method of multi-user multi-aerial transmission | |
| CN102404031A (en) | Self-adaptive user scheduling method based on maximum throughput | |
| CN107171709A (en) | A kind of extensive mimo system method for precoding being applied under aggregate users scene | |
| CN102215073B (en) | Multipoint-multiuser uplink low-complexity MIMO (Multiple Input Multiple Output) detection method | |
| CN104113399B (en) | User choosing method based on Matrix condition number in multi-user MIMO system | |
| CN103516486A (en) | Vector selection modulation-based multi-antenna transmission method, receiving method and device | |
| CN102711135B (en) | Method, system, base station and the user terminal of suppression interference combined by transceiver | |
| CN102332946B (en) | Cooperated multipoint (CoMP) downlink joint transmission method capable of eliminating inter-cell interference and inter-flow interference at same time | |
| CN102006146B (en) | User scheduling method for multiple-user multiple input multiple output (MU-MIMO) system downlink | |
| CN106712820A (en) | Self-interference suppression multi-stream diversity BD precoding method and device | |
| CN108418619B (en) | Signal detection method and device | |
| CN106209186B (en) | Downlink precoding method of multi-user distributed MIMO multi-antenna system | |
| CN105099530B (en) | AF panel method for precoding based on cognitive user leakage power in cognitive radio MIMO-OFDM systems | |
| CN105790804B (en) | A kind of double cell cooperative force zero method for precoding based on local channel correlation | |
| Xiao et al. | MIMO precoding of CDMA systems | |
| US8649251B2 (en) | Multi-user multiplexing method and transmission device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |