CN108306663A - One is based on MIMO Y-channels physical layer simple network coded system and method - Google Patents
One is based on MIMO Y-channels physical layer simple network coded system and method Download PDFInfo
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- 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
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- 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
Abstract
The invention discloses one to be based on MIMO Y-channels physical layer simple network coded system and method, and in a double bounce, multi-user, multiple antennas MIMO Y-channels, the relay nodes Relay of one and only one N antenna has K to have MiThe mutual information user node User of antennai, i=1 ..., K；All communications realize that communication shows in two kinds of channels that multiple access channel is denoted as MAC, and broadcast channel is denoted as BC via Relay；In MAC, all user node UseriCommunicate information to Relay；In BC, recodification information is sent to User by Relayi；In MAC into BC repeating process, Relay is converted by network code based on mutual information relational matrix, global channel information matrix, the user node precoding of system agreement and decoding rule, is realized communication.The present invention provides an easy physical layer pre-coding matrix V to the useriCreate-rule, an easy physical layer decoding matrix WiCreate-rule, an easy transform coding matrix F rule from the MAC stages to the BC stages.
Description
Technical field
The invention belongs to wireless communication technology field, it is related to MIMO Y in a kind of multi-user, multiple antennas, double bounce wireless communication
Channel physical layer simple network coded system and method.
Technical background
Multiple antennas, multi-hop, multi-user wireless network are a kind of important supplements to current commercial network in a organized way, and
Internet of Things, sensor network, the Next-Generations such as family's heterogeneous network enter one of important deployment form of network.Multi-user without
Gauze network is a kind of citation form of current commercial network deployment；Multiple antennas attribute, derived from raising user node anti-interference ability
A kind of important means.Therefore it is based on multi-user, multihop network and next generation wireless network the deployment form of multiple antennas are ground
Study carefully emphasis.But still have many technical difficulties.Wherein main difficulty is, in multi user wireless communication network, communication is certainly
By the realization spent.Current multi-user wireless communication system is still interference-limited.And in inorganization network, without center
The utilization ratio of the coordination of node, the communication resource can also substantially reduce.Its difficulty is, such as how relatively low communication cost,
Fast simple acquisition multi-user communication degree of freedom as possible.Although it is current some studies have shown that theoretically MIMO Y-channels, can be with
It realizes and maximizes degree of freedom.Based on the Relay nodes in MIMO Y-channels, tissue network characteristics are had concurrently, and in tuple knitmesh network
Relay node is flexible, there is the ability for making full use of acquired all channel informations.It realizes interference alignment thought, that is, eliminates user
Between interference.
There are two class nodes, relay node one to be denoted as Relay and user node K, note in MIMO Y-channel systems
For Useri, i=1 ..., K.There are two basic status, multiple access access states to be denoted as MAC and broadcast state for MIMO Y-channels,
It is denoted as BC.All communications are realized via only Relay, in MAC, all user node Useri, i=1 ..., K pass information
Give Relay；In BC, recodification information is sent to User by Relayi, i=1 ..., K.
But it is currently based on the research of MIMO Y-channels, although proposing the possibility of maximum communication degree of freedom acquisition,
It is that can not propose that one kind having actual operation method.And research conclusion is realized based on local interference alignment thought,
It has ignored (operation) characteristic to global system to consider, there is no in view of under global channel information condition, these are assumed may
It cannot achieve at all, and not perfect.
Invention content
In order to solve the above technical problem, the present invention provides be based in a kind of multi-user, multiple antennas, multi-hop wireless communication
MIMO Y-channels physical layer simple network coded system and method.
Technical solution is used by the system of the present invention：One based on MIMO Y-channel physical layer simple networks coding system
System, it is characterised in that：In a double bounce, multi-user, multiple antennas MIMO Y-channels, the relaying knot of one and only one N antenna
Point Relay has K to have MiThe mutual information user node User of antennai, i=1 ..., K；All communications are realized via Relay, are led to
Letter is shown in two kinds of channels, first, multiple access channel, is denoted as MAC, first, broadcast channel, is denoted as BC；In MAC, institute
There is user node UseriCommunicate information to Relay；In BC, recodification information is sent to User by Relayi；In MAC to BC
In repeating process, Relay is based on mutual information relational matrix, global channel information, global volume precoding create-rule, passes through network
Code conversion realizes communication.
Technical solution is used by the method for the present invention：One is based on MIMO Y-channel physical layer simple network coding staffs
Method, in a double bounce, multi-user, multiple antennas MIMO Y-channels, the relay nodes Relay of one and only one N antenna has K
It is a to have MiThe mutual information user node User of root antennai, i=1 ..., K；All communications realize that communication shows two via Relay
In kind channel, first, multiple access channel, is denoted as MAC, first, broadcast channel, is denoted as BC；
It is characterized in that, the described method comprises the following steps：Step 1：In the MAC stages, user carries out network precoding；
Specific implementation includes following sub-step：
Step 1.1：By training sequence, Relay obtains all channel information estimations, obtains system physical layer mutual information and closes
It is matrix A, and preferably pre- encoding and decoding and decoding rule f1.2And f3.1；And distribute A and optimizing code and decode rule f1.2、f3.1It gives
All users；When network topology is constant, when precoding and constant decoding rule, initialization step 1.1 is only used in be run for the first time；
UseriChannel estimation training sequence can be selected in MAC, and the BC stages carry completion；
Step 1.2：User UseriAccording to the physical layer mutual information relational matrix A that Relay is issued, utilize what is arranged in advance
Optimized Coding Based rule function f1.2, A and UseriThe corresponding only node location number m in AiAs parameter, its overall situation is obtained
Pre-coding matrix Vi, Vi←f1.2(A,mi)；
Step 1.3：User UseriAccording to its pre-coding matrix ViAnd UseriPrepare the letter sent to other all users
BreathGenerate the global information matrix X after precodingi=ViSi；WhereinRefer to i-th of user UseriPrepare to remove i to other
All user Σ in additioniThe information of transmission；
Step 1.4：In MAC channels, all user Useri, i=1 ..., K, by unified time beat by respective XiIt sends
To Relay；
Step 2：In the MAC stages into BC stage conversions, Relay carries out global network recodification；
Specific implementation includes following sub-step：
Step 2.1：Relay receives the X that all users sendiSuperposition after channel transformation exports YR, i.e.,Wherein Hi,RRefer to from i-th of user UseriTo the channel gain of the Relay of relay node.
Step 2.2：Relay estimates according to all channel informations are obtained, including MAC global channel information HΣ,R, BC channels
Global channel information HR,Σ, system physical layer mutual information relational matrix A, and preferably pre- encoding and decoding and decoding rule f1.2And f3.1,
Generate Vi←f1.2(A,mi), i=1 ..., K calculate Relay mutual informations code conversion matrix F ← f2.1(A,f1.2,HΣ,R,HR,Σ)；
Step 2.3：Based on Relay mutual information code conversion matrix Fs, pass through the information V received from MA channelsR, generate
Broadcast message XR=FYR, and in BC channels broadcast information XR；
Step 3：In the BC stages, user generates global reception decoding matrix by network code decoding matrix create-rule, and
It obtains all nodes and is sent to user UseriInformation estimation
Specific implementation includes following sub-step：
Step 3.1：User UseriAccording to the system physical layer mutual information relational matrix A of Relay publications, decoding rule
f3.1, form global reception decoding matrix Wi←f3.1(A,mi)；Wherein, miIt is UseriCorresponding only node location is compiled in A
Number；
Step 3.2：User UseriBased on WiDecode the X receivedRSample obtains other users used and gives user Useri
Information is estimated
The method existence rules are：AndIn the presence of；Wherein
P+Expression is the generalized inverse of matrix P；It is identical by describing order with system physical layer mutual information relational matrix A
User it is corresponding, the overall situation receives decoding matrix WiThe diagonal matrix that sequence is formed；It is by mutual with system physical layer
It is corresponding that information relationship matrix A describes the identical user of order, global pre-coding matrix ViThe diagonal matrix that sequence is formed；HR,Σ,
HΣ,RIt is BC and MAC global channel information matrixs respectively.
Preferably, F ← f2.1(A,f1.2,H∑,R,HR,∑) computation rule is：
The method of the present invention has the advantages that following and advantageous effect compared with prior art：
(1) present invention is that the encoding and decoding carried out based on global mutual information relational matrix A and global channel information are set
Meter, thus it is operable very strong, and there is no because being based on localized design, cause the inoperable problem in mathematical computations；
(2) present invention is in user side, and nothing is it is understood that channel information feature, it is only necessary to based on global mutual information relational matrix
A carries out precoding, is carried out with the preferred codec design rule of system, and operation is simple, requires also reduce to node capacity；
(3) present invention can obtain channel matrix in the sides Relay by training sequence, based on global mutual information relationship
Matrix A carries out, and is carried out with preferred codec design rule of uniting, you can obtains information transition matrix coding, simplifies operation step
Suddenly；
(4) the present invention is based on current conditions, realize simple physical-layer network coding；
(5) coding existence condition and coding rule, including F, V are clearly providedi, Wi；
(6) encoding and decoding rule adequately optimizes space to system optimization, is compatible with to other coding methods, it is only necessary to meet base
This rule.
Description of the drawings
Fig. 1 is the system architecture diagram of the embodiment of the present invention；
Fig. 2 is the method flow diagram of the embodiment of the present invention.
Specific implementation mode
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and embodiments to this hair
It is bright to be described in further detail, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
Referring to Fig.1, one provided by the invention is based on MIMO Y-channel physical layer simple network coded systems, it is assumed that channel
Estimated using MAC, BC channel and training sequence information by improving, and has (compared with) ideal channel estimation, such as
In the case that SNR conditions are relatively good；Entire encode is divided into three phases, MAC pre-coding stages, the network code stage of Relay,
And BC decoding stages, it is abbreviated as MAC, NC, BC stages respectively.Three phase communications press MAC, and NC, BC sequential is alternately；System
Allow full-duplex communication, allows in the different channels such as different time-divisions, frequency division, space division are independent or mixing divides, there are multiple communications
Cycle MAC, NC, BC by identical or different time beat and are deposited, and the system of the present embodiment is primarily directed to one of channel
MAC, NC, BC process；In the MAC stages of system, all user nodes, Useri(i=1 ..., K) to sending informationWith pre-
Encoder matrix ViPrecoding is carried out, X is obtainedi, and same time beat is pressed, by encoded infonnation XiIt is sent to relay node Relay
Convergence is YR；In the MAC stages into BC phase transitions, the docking of Relay nodes, which is collected mail, described in system ceases YR, according to global channel
Information and preset all pre-coding matrix Vi, recodification matrix F is generated, with F to YRNetwork code recodification is carried out to generate
XR；After the NC stages, that is, enter BC stages, this stage, Relay broadcast datas Y described in systemR, each user node UseriIt receives
To the information of oneself, user is according to pre-coding matrix ViInformation is generated to receiving decoding matrix Wi, the docking collection of letters, which ceases, to be decoded
Complete primary complete independent communication.The present invention essentially consists in, and based under this system channel model, i.e., commonly referred to as MIMO Y believe
Road model, to F, Vi, WiStructural theory and practice innovation.
For example is described in detail, the present embodiment is as follows with the system symbol system more refined：Relay has N root antennas, K a
User, each user have K-1 root antennas；ViIn refinement prelist code submatrix, be expressed as V[i,j], indicate from user Useri, refer to
To user UserjPre-coding matrix；s[i,j]It indicatesIn from user UseriIt is directed toward user UserjInformation；Y[Σ,R]It indicates
All K users issue Relay, the information received by Relay；That is subscript [A, B] expression is sent out from A, and target is the parameter of B,
Σ indicates all users, ΣiIt indicates to remove UseriAll users in addition, R indicate Relay；Other H indicate channel information, similarly H[Σ,R]Indicate that K user issues Relay global channel information, i.e., aforementioned HΣ,R；F indicates the slave Y that Relay is executed[Σ,R]To X[R,Σ]'s
Transition matrix；M indicates decoding matrix, W[i,j]Indicate decoding from user Useri, it is directed toward user UserjInformation decoding matrix.
A is overall intercommunication relational matrix.
See Fig. 2, a kind of simple network volume for realizing interference alignment based on MIMO Y-channel physical layers provided by the invention
Code method, including three big steps, 9 small steps.
Step 1：In the MAC stages, user carries out network precoding；
Step 1.1：By training sequence, Relay obtains all channel information estimations, obtains system physical layer mutual information and closes
It is matrix A, and distributes A to all users；Distribution simultaneously to be the condition that meets have preferred pre- encoding and decoding and a decoding rule f1.2
And f3.1.When network topology is constant, when precoding and constant decoding rule, initialization step 1.1 is only used in be run for the first time；
UseriChannel estimation training sequence can be selected in MAC, and the BC stages carry completion；Because channel estimation is maturation method at this
In repeat no more, only assume respective channel information matrix is obtained by correlation method.For example, when information condition ideal,
Such as high SNR, K with other K-1 users through MIMO Y-channel mutual trusts when,
At this moment channel
Map functionBe equivalent to fromBecome
It changes toDirect operation；It is equivalent to operate
Wherein 01×(K-1)Indicate 1 row (K-1) row null matrix.The operation of this cost is system physical layer mutual information relationship square
Battle array, i.e.,：
This is under ideal conditions the antenna M it is assumed that when channel is more satisfactoryiIt is not only determination, needs according to reality
Mapping relations, still have fromIt arrivesEquivalent mapping relations A, only form have difference.
Step 1.2：User UseriAccording to the physical layer mutual information relational matrix A that Relay is issued, utilize what is arranged in advance
Optimized Coding Based rule function f1.2, A and UseriThe corresponding only node location number m in AiAs parameter, its overall situation is obtained
Pre-coding matrix Vi, Vi←f1.2(A,mi)；Here it is as example, if mi=i；IfTherefore, the condition of satisfaction need only be set
.Concrete form requirementDo not amplify original signal power.For example, can setUnder ideal assumed condition, i.e., there are K-1 root antennas, every antenna pair per user
When answering user's transmitting, and not considering Space Time Coding.When system has other Space Time Coding requirements, it is only necessary in conjunction with space -time code
It is required that with sets requirement.More satisfactory hypothesis is similar, and only structure needs to be set according to antenna relationship, rather than ideal square formation
Structure.
Step 1.3：User UseriAccording to each pre-coding matrix V with informationi, i.e.,It generates to each individually mutual
The precoding vectors of information, according to send information,s[i,j]Middle i ≠ j generates precoding
Global information matrix X afterwardsi, i.e.,
Step 1.4：In MAC channels, all user UseriGlobal information after encoding is sent by unified time beatTo Relay；
Step 2：In the MAC stages into BC stage conversions, Relay carries out global network recodification；
Step 2.1：Relay receives the X that all users sendi, i=1 ..., K, whereinIt obtains
Step 2.2：Relay estimates according to all channel informations are obtained, including MAC global channel information HΣ,R, BC channels
Global channel information HR,Σ, system physical layer mutual information relational matrix A, and preferably pre- encoding and decoding and decoding rule f1.2And f3.1,
Generate Vi←f1.2(A,mi), i=1 ..., K calculate Relay mutual informations code conversion matrix F ← f2.1(A,f1.2,HΣ,R,HR,Σ)；
It enablesAccording to it is assumed that enablingThere are F=(BH[R,Σ])+(H[Σ,R]BT)+, wherein (BH[R,Σ])+BH is sought in expression[R,Σ]Generalized inverse matrix, when wide
In the absence of adopted inverse matrix, coding is invalid；
Step 2.3：Based on Relay mutual information code conversions matrix F=(BH[R,Σ])+(H[Σ,R]BT)+, by from MA channels
The information received is i.e.Generate the broadcast letter in BC stages
Breath is X[R,Σ]=FY[Σ,R]And it sends；
Step 3：In the BC stages, user carries out network code decoding matrix create-rule and generation method, and is owned
Node is sent to user UseriInformation estimation
Step 3.1：The physical layer information A that user issues according to Relay, decoding rule f3.1, form the system overall situation and receive solution
Code matrix, this example are
Step 3.2：User UseriBased on WiThe X for decoding and receivingRSample, i.e. code Y[R,i]=H[R,i]X[R,Σ]+ N, then
Decoding obtains
The existence rules of the method for the present invention are：：AndIt deposits
.Wherein P+Expression is the generalized inverse of matrix P；It is by being described with system physical layer mutual information relational matrix A
The identical user of order is corresponding, and the overall situation receives decoding matrix WiThe diagonal matrix that sequence is formed；Be by with system
It is corresponding that physical layer mutual information relational matrix A describes the identical user of order, global pre-coding matrix ViSequence is formed diagonal
Battle array；HR,Σ, HΣ,RIt is BC and MAC global channel information matrixs respectively.
All of above coding carries out under following criterion：
UseriPre-coding matrix with receive decoding criterion be：Wherein,
A, that is, system physical layer mutual information relational matrix,It is to describe the identical user's overall situation of order with A to receive decoding square
Battle array WiThe diagonal matrix that sequence is formed；It is to describe the identical user's overall situation of order with A to receive pre-coding matrix ViSequence
Arrange the diagonal matrix formed；Function Vi←f1.2(A, i), Wi←f3.1(A, i) must satisfy the above rule.
F←f2.1(A,f1.2,H∑,R,HR,∑) computation rule be：
The present invention is based on MIMO Y-channel systems, and assumed condition can be achieved：There is (compared with) ideal channel estimation, such as
In the case that SNR conditions are relatively good；All users have identical antenna number and mutual information association protocol (step 1.1).By complete
Making full use of for office's property channel information, proposes operable MIMO Y-channels network coding method.Main feature i.e. of the present invention exists
In design an easy physics is provided to the user in the MAC stages based on achievable it is assumed that based on overall intercommunication relational matrix
Layer pre-coding matrix create-rule, an easy physical layer decoding matrix create-rule is provided to the user in the BC stages, and
An easy transform coding matrix F rule and corresponding system operation rule from the MAC stages to the BC stages is provided for Relay
Then.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this
The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention
Profit requires under protected ambit, can also make replacement or deformation, each fall within protection scope of the present invention, this hair
It is bright range is claimed to be determined by the appended claims.
Claims (3)
1. one is based on MIMO Y-channel physical layer simple network coded systems, it is characterised in that：A double bounce, multi-user,
In multiple antennas MIMO Y-channels, the relay nodes Relay of one and only one N antenna has K to have MiThe mutual information user of antenna
Node Useri, i=1 ..., K；All communications realize that communication is shown in two kinds of channels, first, multiple access via Relay
Channel is denoted as MAC, first, broadcast channel, is denoted as BC；In MAC, all user node UseriCommunicate information to Relay；
In BC, recodification information is sent to User by Relayi；In MAC into BC repeating process, Relay is based on mutual information relationship square
Battle array, the user node precoding of global channel information matrix, system agreement and decoding rule, are converted by network code, are realized
Communication.
2. one is based on MIMO Y-channel physical layer simple network coding methods, in a double bounce, multi-user, multiple antennas MIMO Y
In channel, the relay nodes Relay of one and only one N antenna has K to have MiThe mutual information user node User of antennai, i=
1,…,K；All communications realize that communication is shown in two kinds of channels via Relay, first, multiple access channel, is denoted as MAC,
First, broadcast channel, is denoted as BC；
It is characterized in that, the described method comprises the following steps：
Step 1：In the MAC stages, user carries out network precoding；
Specific implementation includes following sub-step：
Step 1.1：By training sequence, Relay obtains all channel information estimations, obtains system physical layer mutual information relationship square
Battle array A and pre- encoding and decoding and decoding rule f1.2And f3.1；And distribute A and encoding and decoding rule f1.2、f3.1To all users；When
Network topology is constant, precoding and decoding rule it is constant when, initialization step 1.1 be only used in for the first time run；UseriChannel is estimated
Training sequence selection is counted in MAC, the BC stages carry completion；
Step 1.2：User UseriAccording to the physical layer mutual information relational matrix A that Relay is issued, compiled using the optimization arranged in advance
Code rule function f1.2, A and UseriThe corresponding only node location number m in AiAs parameter, its global precoding is obtained
Matrix Vi, Vi←f1.2(A,mi)；
Step 1.3：User UseriAccording to its pre-coding matrix ViAnd UseriPrepare the information sent to other all users
Generate the global information matrix X after precodingi=ViSi；WhereinRefer to i-th of user UseriPrepare to other in addition to i
All user ΣiThe information of transmission；
Step 1.4：In MAC channels, all user Useri, i=1 ..., K, by unified time beat by respective XiIt is sent to
Relay；
Step 2：In the MAC stages into BC stage conversions, Relay carries out global network recodification；
Specific implementation includes following sub-step：
Step 2.1：Relay receives the X that all users sendiSuperposition after channel transformation exports YR, i.e.,Wherein Hi,RRefer to from i-th of user UseriTo the channel gain of the Relay of relay node；
Step 2.2：Relay estimates according to all channel informations are obtained, including MAC global channel information HΣ,R, BC channels the overall situation
Channel information HR,Σ, system physical layer mutual information relational matrix A and pre- encoding and decoding and decoding rule f1.2And f3.1, generate Vi←
f1.2(A,mi), i=1 ..., K calculate Relay mutual informations code conversion matrix F ← f2.1(A,f1.2,HΣ,R,HR,Σ)；
Step 2.3：Based on Relay mutual information code conversion matrix Fs, pass through the information Y received from MA channelsR, generate broadcast letter
Cease XR=FYR, and in BC channels broadcast information XR；
Step 3：In the BC stages, user generates global reception decoding matrix by network code decoding matrix create-rule, and obtains
All nodes are sent to user UseriInformation estimation
Specific implementation includes following sub-step：
Step 3.1：User UseriAccording to the system physical layer mutual information relational matrix A of Relay publications, decoding rule f3.1, formed
The overall situation receives decoding matrix Wi←f3.1(A,mi)；Wherein, miIt is UseriThe corresponding only node location number in A；
Step 3.2：User UseriBased on WiDecode the X receivedRSample obtains other users used and gives user UseriInformation is estimated
Meter
3. according to claim 2 be based on MIMO Y-channel physical layer simple network coding methods, which is characterized in that F ←
f2.1(A,f1.2,HΣ,R,HR,Σ) computation rule is：
The method existence rules are：AndIn the presence of；
Wherein P+Expression is the generalized inverse of matrix P；It is by being described with system physical layer mutual information relational matrix A
The identical user of order is corresponding, and the overall situation receives decoding matrix WiThe diagonal matrix that sequence is formed；Be by with system
It is corresponding that physical layer mutual information relational matrix A describes the identical user of order, global pre-coding matrix ViSequence is formed diagonal
Battle array；HR,Σ, HΣ,RIt is BC and MAC global channel information matrixs respectively.
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| US9485063B2 (en) * | 2001-04-26 | 2016-11-01 | Genghiscomm Holdings, LLC | Pre-coding in multi-user MIMO |
| WO2013143099A1 (en) * | 2012-03-29 | 2013-10-03 | Nec(China) Co., Ltd. | Method and apparatus for link adaptation in precoded mimo systems |
| CN105429684A (en) * | 2015-10-29 | 2016-03-23 | 河南理工大学 | Y channel low complexity interference elimination method |
| CN106646394A (en) * | 2017-02-28 | 2017-05-10 | 湖北工业大学 | Method for designing loop-optimization-based emission beam matrix in FDA-MIMO radar |
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