CN104363036A - Signal alignment method for multi-user two-way relay system - Google Patents
Signal alignment method for multi-user two-way relay system Download PDFInfo
- Publication number
- CN104363036A CN104363036A CN201410693142.0A CN201410693142A CN104363036A CN 104363036 A CN104363036 A CN 104363036A CN 201410693142 A CN201410693142 A CN 201410693142A CN 104363036 A CN104363036 A CN 104363036A
- Authority
- CN
- China
- Prior art keywords
- user
- design
- alignment
- singular value
- relaying
- 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
- 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
- H04B7/0426—Power distribution
- H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides an opportunity signal alignment method in a multi-user two-way relay scene. The method is used for the following scene which involves a two-way communication system comprising a multi-antenna relay and multiple pairs of multi-antenna users, wherein the number of antennas of the relay is larger than or equal to the number of antennas of the users, and at the moment, the number of the antennas of the users is not enough to support a classic signal space alignment algorithm. The method includes the following two operating steps of (1), the user beam forming vector design stage and (2), the user scheduling stage. In the user wave beam forming vector design stage, beam forming vectors of each pair of the users which conduct information interaction are designed in a joint mode and are made to be aligned in one direction as much as possible under the limited condition. In the user scheduling stage, user scheduling is conducted through singular values acquired in the beam forming design process, and a relay processing matrix is designed. Beam forming design at the receiving end can be conducted with reference to the uplink design. The rate of the method is greatly improved compared with that of opportunity alignment of single-antenna users. When alterative users are adequate, the freedom degree reached by the scheme can approach the maximum reachable freedom degree of the system.
Description
Technical field
The present invention relates to a kind of transmission plan for multi-user's bidirectional relay system, exactly, be beamforming vectors design and the user scheduling conceptual design of multiple antennas user, belong to wireless communication technology field.
Background technology
In recent years, two-way wireless communication technology effectively improves because of it concern that spectrum efficiency causes people, and is applied to the multiple fields such as adaptive network and cell mobile communication systems.Generally, for bi-directional relaying communication, information transmission was formed primarily of two stages: multichannel access (MAC) stage and broadcast (BC) stage.At first stage, namely the MAC stage, information is sent to relaying by user simultaneously.In the BC stage, all user profile received are carried out processing and are sent to all users by relaying.User eliminates the interference of self information after receiving information and decoding obtains required information.
Owing to can obtain the higher degree of freedom (DoF) in multi-user interference channel, interference alignment (IA) technology is introduced in bidirectional relay system.In the scene of MIMO Y-channel, someone proposes the technology that one is called signal space alignment (SSA), and signal alignment technology and bilateral relay network combine by this technology, in the hope of reaching higher DoF.Under the program, in the MAC stage, three users send signal to relaying simultaneously, and the information of carrying out a pair user of information interaction snaps to a direction in relay.In the BC stage, the signal of alignment is sent to receiving terminal by relaying.Can prove, when user configures M root antenna, link deployment N root antenna, and number of antennas meets
time, it is 3M that system reaches optimum DoF.After this, SSA technology is applied to several scenes again.
In order to realize actual application under the condition of low complex degree, people propose more actual chance interference alignment (OIA) technology in singly entering in multi-output system of K community.Can prove, in the interference channel of three users, as long as alternative user is abundant, even if user uses accidental beam shaping, when reception user is abundant, when providing the chance disturbed and can align, system can reach optimum DoF.Someone considers the multi-user's gain in multi-user's bidirectional relay system, propose channel alignment scheme (CAPS) and semi-orthogonal channel alignment scheme (SCAPS), by introducing multi-user diversity, the channel of the often couple of user that aligns decreases the internal interference of user.
For existing method only in the problem that single-antenna subscriber is suitable for, under the present invention proposes a kind of user's multiaerial system, combine the method for beamforming design and user scheduling.
Summary of the invention
In view of this, the object of this invention is to provide the method for united beam form finding design in a kind of multi-user's bidirectional relay system and user scheduling.Within the system, user and relaying all configure multiple antennas.The present invention will introduce multi-user's gain, and align with signal space and combine, and propose the scheme of a kind of united beam form finding design and user scheduling.When user can not meet the alignment of perfect signal space, make its alignment as far as possible by beamforming design, in multi-user, then select the good user of degree of registration comparatively speaking, complete beamforming design and user scheduling.Institute's extracting method aligns compared with the chance of single-antenna subscriber and speed has a distinct increment, and when alternative user is enough large, the degree of freedom can reach the degree of freedom close to maximum.
In order to achieve the above object, the invention provides the opportunity signal alignment schemes under a kind of multi-user's bi-directional relaying scene, for following scene: the intercommunication system comprising a relaying and multiple user, relaying and with configuring multiple antennas per family, and the antenna number of relaying and user antenna quantity meet certain condition, now perfectly signal space alignment is no longer applicable.Described method comprises following two operating procedures:
(1) the beamforming vectors design phase: co-design often pair carries out the beamforming vectors of the user of information interaction, it is made to snap to as much as possible under the limited conditions on a direction.Thus reach the object of often pair of signal alignment as far as possible.
To put forward the concrete steps of beamforming vectors design as follows: first all users is simultaneously to repeat transmitted signal, and relaying obtains CSI H
i, the channel matrix of often couple of user is formed a new matrix, is defined as just to channel matrix A
i=[H
i,-H
i+K], for reaching the object of alignment as far as possible, singular value decomposition (SVD) is carried out to matrix A i, namely has
after SVD decomposes, select those row that minimum singular value in orthogonal matrix is corresponding, i.e. B
i=(Q
i)
2M, as the beamforming vectors of this user.
(2) in the user scheduling stage: after the beamforming design of completing user, the singular value utilizing the svd algorithm of beamforming design to obtain carries out user scheduling, and completes the design of relay process matrix.The beamforming design of receiving terminal can with reference to up design.
(21) in the beamforming vectors design phase, carried out the design of user wave beam shaping by svd algorithm, now often couple of user correspond to a singular value
i=1 ..., K.Based on this, the method united beam shaping vector design carries out user scheduling.Because often couple of user now correspond to the singular value λ after a channel matrix SVD decomposition
i, utilize the selection of this singular value completing user here.From K singular value λ
iin select minimum N number of.Namely in all alternative user, select the minimum N corresponding to N number of singular value to user as communication user.
(22) after completing user scheduling, select the user allowing communication, allow user's logarithm of communication equal with the antenna number that relaying is equipped with here.Owing to not having perfect alignment, often pair of user profile vector now not snaps on a direction, definition
i=1 ..., K is as the equivalent signal of often pair of signal after opportunity signal spatial alignment.Go out a reasonable direction as this equivalent directions to user.And design relay process matrix with this, select brokenly zero (ZF) to process here, i.e. W=β W
hw, wherein W=G
-1, G=[G
1..., G
n].
This completes ascender, the beamforming vectors design of the receiving terminal in descending is similar principle to up.
The present invention is a kind of opportunity signal spatial alignment method, co-design beamforming vectors and user scheduling scheme of being applicable to multi-user's bidirectional relay system.Its advantage is: under user's multiple antennas condition, improve the capacity of system, and under the condition that alternative user is abundant, system can reach maximum and reach DoF.The innovation key of the inventive method is: in multi-user's bidirectional relay system, when user antenna number can not settling signal spatial alignment time, introduce multi-user diversity, making up can not the defect of perfect alignment, when alternative user is abundant, reach the system DoF under signal space alignment as far as possible, the DoF that the maximum possible that namely communicates reaches.By SVD scheme, complete the design of united beam shaping vector sum user scheduling scheme, reach the object of opportunity signal spatial alignment.Thus, improve the capacity of system, and when alternative user is abundant, user reaches the maximum DoF that system can reach.
Accompanying drawing explanation
Fig. 1 is application scenarios of the present invention: the bidirectional relay system of multi-user.
Fig. 2 is the flow chart of opportunity signal spatial alignment method of the present invention.
Fig. 3 is in the embodiment of the present invention, and alternative user is different, the analogous diagram that channel capacity changes along with signal to noise ratio.
Fig. 4 is in the embodiment of the present invention, and user configures the antenna of varying number, the analogous diagram that channel capacity changes along with signal to noise ratio.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
See Fig. 1, first introduce the application scenarios of the inventive method: the bidirectional relay system comprising a relaying and multiple user, wherein link deployment N root antenna, user configures M root antenna, and a total K, to alternative user, completes the information interaction of N to user.Main consider that perfect signal space aligns irrealizable scene here, that is, user is now satisfied with the antenna amount of relaying
condition.Use H
irepresent the channel matrix of i-th user to relaying, 1≤i≤K.V
irepresent the beamforming vectors of i-th user.Communication completes in two stages, i.e. multichannel access (MAC) stage and broadcast (BC) stage.In the MAC stage, all K send information to relay to user simultaneously, and the CSI of the overall situation known by relaying; In the BC stage, relaying is selected and will be carried out the N of information transmission to user, and designs relay process matrix, selects ZF scheme in relay.
See Fig. 2, introduce following two operating procedures of the inventive method:
(1) the beamforming vectors design phase: co-design often pair carries out the beamforming vectors of the user of information interaction, it is made to snap to as much as possible under the limited conditions on a direction.Thus reach as far as possible by the object of signal alignment.
Due to the condition of now signal space alignment
Can not meet, in order to settling signal spatial alignment as much as possible, so make as far as possible
Level off to 0, namely the condition of approach signal spatial alignment as much as possible, obtains
Utilize SVD to try to achieve to meet the beamforming vectors of this condition.Conveniently, make
Here
to A
icarry out singular value decomposition, namely
then B is selected
i=(Q
i)
2N, B now
icorresponding is singular value minimum after SVD.This singular value also will be used in user scheduling.
(2) estimation stages: after the beamforming design of completing user, the singular value utilizing the svd algorithm of beamforming design to obtain carries out user scheduling, and completes the design of relay process matrix.The beamforming design of receiving terminal can with reference to up design.Concrete steps are as follows:
(21) in the beamforming vectors design phase, carried out the design of user wave beam shaping by svd algorithm, now often couple of user correspond to a singular value
i=1 ..., K.Based on this, the method united beam shaping vector design carries out user scheduling.Because often couple of user now correspond to the singular value λ after a channel matrix SVD decomposition
i, utilize the selection of this singular value completing user here.From K singular value λ
iin select minimum N number of.Namely in all alternative user, select the minimum N corresponding to N number of singular value to user as communication user.
(22) after completing user scheduling, select the user allowing communication, allow user's logarithm of communication equal with the antenna number that relaying is equipped with here.Owing to not having perfect alignment, often pair of user profile vector now not snaps on a direction, definition
i=1 ..., K is as the equivalent signal of often pair of signal after opportunity signal spatial alignment.Go out a reasonable direction as this equivalent directions to user.And design relay process matrix with this, select brokenly zero (ZF) to process here, i.e. W=β W
hw, wherein W=G
-1, G=[G
1..., G
n].
In order to show the Practical Performance of the inventive method, applicant carried out Multi simulation running and implementing test.Network configuration models in pilot system is the application scenarios shown in Fig. 1.The result of l-G simulation test as shown in Figure 3 and Figure 4, emulates in different two.
As seen from Figure 3, the capacity that the inventive method obtains is along with the change of SNR, and when alternative user increases, the performance of system has obvious lifting.Fig. 4 shows, the channel capacity that the inventive method obtains has obvious lifting than CAPS and SCAPS and random ZF scheme.
The foregoing is only preferred embodiments of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (3)
1. the opportunity signal alignment schemes under multi-user's bi-directional relaying scene, for following scene: the intercommunication system comprising a relaying and multiple user, relaying and with configuring multiple antennas per family, and the antenna number of relaying and user antenna quantity meet certain condition, namely, the antenna number of relaying is more than or equal to user's multiple antennas number, and the limited support classical signals spatial alignment transmission method that is not enough to of the antenna number of user, now perfectly signal space alignment is no longer applicable.Described method comprises following two operating procedures:
(1) in the user wave beam shaping vector design stage: co-design often pair carries out the beamforming vectors of the user of information interaction, make it snap to as much as possible under the limited conditions on a direction, thus reach the object of at utmost being alignd by signal.
(2) in the user scheduling stage: after the beamforming design of completing user, this algorithm utilizes the singular value obtained in user wave beam form finding design process to carry out user scheduling, and completes the design of relay process matrix.The beamforming design of receiving terminal can with reference to up design.
2. method according to claim 1, is characterized in that:
To put forward the concrete steps of beamforming vectors design as follows: first all users is simultaneously to repeat transmitted signal, and relaying obtains channel information (CSI) H of the system overall situation
i, the channel matrix of often couple of user is formed a new matrix, is defined as just to channel matrix A
i=[H
i,-H
i+K].For reaching the object of alignment as far as possible, align channel matrix A
icarry out singular value decomposition (SVD), namely have
after SVD decomposes, select those row that minimum singular value in orthogonal matrix is corresponding, i.e. B
i=(Q
i)
2M, as the beamforming vectors of this user.
3. method according to claim 1, described step (2) comprises following content of operation further
(21) in the beamforming vectors design phase, carried out the design of user wave beam shaping by svd algorithm, now often couple of user correspond to a singular value
based on this, the method united beam shaping vector design carries out user scheduling.Because often couple of user now correspond to the singular value λ after a channel matrix SVD decomposition
i, utilize the selection of this singular value completing user here.From K singular value λ
iin select minimum N number of.Namely in all alternative user, select the minimum N corresponding to N number of singular value to user as communication user.
(22) after completing user scheduling, select the user allowing communication, allow user's logarithm of communication equal with the antenna number that relaying is equipped with here.Owing to not having perfect alignment, often pair of user profile vector now not snaps on a direction, definition
as the equivalent signal of often pair of signal after opportunity signal spatial alignment.Go out a reasonable direction as this equivalent directions to user.And design relay process matrix with this, select brokenly zero (ZF) to process here, i.e. W=β W
hw, wherein W=G
-1, G=[G
1..., G
n].
This completes ascender, the beamforming vectors design of the receiving terminal in descending is the same principle with up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410693142.0A CN104363036B (en) | 2014-11-26 | 2014-11-26 | A kind of signal alignment method for multi-user's bidirectional relay system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410693142.0A CN104363036B (en) | 2014-11-26 | 2014-11-26 | A kind of signal alignment method for multi-user's bidirectional relay system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104363036A true CN104363036A (en) | 2015-02-18 |
| CN104363036B CN104363036B (en) | 2018-11-16 |
Family
ID=52530267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410693142.0A Active CN104363036B (en) | 2014-11-26 | 2014-11-26 | A kind of signal alignment method for multi-user's bidirectional relay system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104363036B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694628A (en) * | 2012-05-07 | 2012-09-26 | 西安电子科技大学 | Interference suppression method for multi-user MIMO collaborative relay system |
| CN102710395A (en) * | 2012-06-06 | 2012-10-03 | 西安电子科技大学 | Cooperative transmission method based on united beam forming |
| CN102868433A (en) * | 2012-09-10 | 2013-01-09 | 西安电子科技大学 | Signal transmission method based on antenna selection in multiple-input multiple-output Y channel |
| CN103152086A (en) * | 2013-02-05 | 2013-06-12 | 上海交通大学 | Method for processing beam forming robustness signal on relay end of bi-direction multi-relay system |
-
2014
- 2014-11-26 CN CN201410693142.0A patent/CN104363036B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694628A (en) * | 2012-05-07 | 2012-09-26 | 西安电子科技大学 | Interference suppression method for multi-user MIMO collaborative relay system |
| CN102710395A (en) * | 2012-06-06 | 2012-10-03 | 西安电子科技大学 | Cooperative transmission method based on united beam forming |
| CN102868433A (en) * | 2012-09-10 | 2013-01-09 | 西安电子科技大学 | Signal transmission method based on antenna selection in multiple-input multiple-output Y channel |
| CN103152086A (en) * | 2013-02-05 | 2013-06-12 | 上海交通大学 | Method for processing beam forming robustness signal on relay end of bi-direction multi-relay system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104363036B (en) | 2018-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8937899B2 (en) | Amplify-and-forward relaying in communication systems | |
| CN103117970B (en) | The system of selection of full-duplex antenna in mimo system | |
| CN102983934A (en) | Method and device for linear precoding in multi-user multiple input multiple output system | |
| CN105634571A (en) | Pilot frequency pollution reduction method based on partial pilot frequency multiplexing in large-scale MIMO system | |
| CN103248414B (en) | A kind of based on interference alignment and many relayings double bounce transmission method of wave beam forming | |
| CN103312389A (en) | Multiuser interference suppression method, terminal and base station | |
| KR102306100B1 (en) | Apparatus for processing transmission/reception signal for interference alignment in a mu-mimo interference broadcasting channel and method thereof | |
| CN106060950A (en) | Opportunity interference alignment-based method for data transmission in cellular downlink channel | |
| CN105429709B (en) | A kind of MU MISO visible light communication systems ZF pre-coding matrix determines method | |
| CN105515625B (en) | Multiuser downstream transmission method based on receiving end spatial modulation | |
| US8891643B2 (en) | Method and apparatus for allocating transmission power in multi input multi output system | |
| Ban et al. | A practical antenna selection technique in multiuser massive MIMO networks | |
| CN102510324B (en) | Signal transmission method based on network coding in multi-input and multi-output Y channel | |
| CN104378146A (en) | Method for pairing user equipment in uplink MU-MIMO system | |
| CN103384228B (en) | Continuous precoding and the user of a kind of multiuser MIMO broadcast channel select unified algorithm | |
| CN105007108A (en) | Distributed interference alignment method based on transmit antenna selection | |
| CN101286823A (en) | Data-transmission method and system for MIMO system | |
| CN102457324A (en) | Downlink multi-user multi-path beamforming method and device in FDD (Frequency Division Duplexing) system | |
| CN104113399B (en) | User choosing method based on Matrix condition number in multi-user MIMO system | |
| CN106357570A (en) | A Time Division Interference Alignment Method for Full-duplex Base Station Cellular Network | |
| CN103269242B (en) | A kind of uplink coordinated junction waves beam forming method based on convex optimization | |
| CN103346867B (en) | Multiple cell multi-user's co-channel interference suppression method based on triangle decomposition and SLNR algorithm | |
| CN106230493B (en) | A kind of selection of multiuser MIMO uplink antenna and user scheduling method | |
| CN106209186B (en) | Downlink precoding method of multi-user distributed MIMO multi-antenna system | |
| CN102624433B (en) | Multipath beam-forming method and realize the terminal of multipath beam shaping |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |