CN109818661A - A kind of communication means based on signal space alignment - Google Patents
A kind of communication means based on signal space alignment Download PDFInfo
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- CN109818661A CN109818661A CN201910084632.3A CN201910084632A CN109818661A CN 109818661 A CN109818661 A CN 109818661A CN 201910084632 A CN201910084632 A CN 201910084632A CN 109818661 A CN109818661 A CN 109818661A
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Abstract
The present invention provides a kind of communication means based on signal space alignment, which comprises each user passes through coded treatment to information to be sent, generates and sends signal, and the transmission signal is sent to relay node；It is executed in the relay node: receiving the transmission signal and simultaneously generate reception signal, and obtained after being encoded to the reception signal and signal；Signal receiving end eliminates the interference message received, obtains useful signal.Using the embodiment of the present invention, using major network as Y-channel, secondary net is X channel and to deposit two-way single relay node of network be system model figure, according to the physical layer network coding technique under broad sense signal alignment, the scheme for improving multiplex network gain and improving system performance can be obtained for the illustraton of model that primary and secondary net is any number of users.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly to a kind of communication means based on signal space alignment.
Background technique
The purpose of image defogging is the interference in order to reduce mist as far as possible from the image obscured by mist, restores scene mesh
Mark enhances the contrast and clarity and the details for recovering image of image, improves image viewability etc..Current defogging
Algorithm is applied to the occasions such as land scene, especially traffic monitoring mostly, and the defogging for specializing in this special occasions of sea fog is calculated
Method, which is not much, sees.
Communication Development so far, from wire communication gradually to wireless communication transition.It is successfully demonstrated from Marconi in 1897
Till now, extensive research has been obtained in wireless communication technique to radiotelegram.It wirelessly communicates and develops from pure mobile call
To the radio multimedium application platform for being able to carry out file transmission and audio-video function, and such as file transmits, and audio-video etc. is mutual
The extensive use of dynamic content can put forward higher requirements network quality.In order to meet these demands, following wireless communication system
System needs to provide better flexibility and scalability to meet the needs of various.Currently, using relay node in the wireless network
Technology can be improved the system performance of network, expand the coverage area, and promote the availability of frequency spectrum, save Internet resources.And relay section
The multiple antennas characteristic of point can make wireless network form mimo system, so that system performance be made to further increase.Present communications
The main focus of aspect has the new technologies such as MIMO and network code.
MIMO technology is proposed in the Marconi by Italy in 1908, is mainly used to solve declining in wireless channel
Fall problem.It can be made to constitute MIMO to the relay node and mobile station equipment mutiple antennas in traditional mobile communication system
Communication link thus can be improved the power system capacity of link between relay node and mobile station, greatly improve system communication
Efficiency.MIMO technology is combined with distributing antenna system, can not only inherit the advantage of the latter, is reduced in signals transmission
Path loss, weaken shadow effect, the capacity of system can also be greatly improved.Compared to traditional single antenna systems, mimo system
Channel capacity can be greatly improved, it is made to approach shannon capacity, to solve the problems, such as that the capacity requirement of big data business provides
Prospect.
The superfast rate of information throughput of future broadband wireless communication systems proposes very big choose to existing communication network structure
War.The problem more nervous for existing radio spectrum resources, following cordless communication network may frequency of use be higher than
The frequency band of 3GHz, decaying of the wireless signal when high band wireless medium is propagated can be than more serious, thus the coverage area of base station
It will will be greatly reduced.In order to guarantee transmission rate, need that transmission power is significantly increased in mobile terminal.However, mobile terminal is sent out
The increase for penetrating power will certainly promote the radiation risk of mobile terminal user, while being also required to improve existing battery capacity and deposit
Storage technology.Relay node transmission technology can be good at solving the above problems, and core concept is that cloth is set low in cellular cell
The relay node of cost and low-power consumption can extend the coverage area of cell signals with lifting system handling capacity, more particularly to
Improve the signal quality close to cell boundary users.
In double-direction radio relay node channel, two nodes send respective data packet by different time slots respectively, in
Two packet combinings are sent respectively to respective node at a network packet after node.Physical layer network coding technique requirement
Stringent time synchronization allows two nodes while sending data packet, so as to save time slot, will lead to antenna resources waste
Deficiency and frequency spectrum resource utilization rate it is lower.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of based on signal space alignment
Communication means, using major network as Y-channel, secondary net is X channel and to deposit two-way single relay node of network be system model figure, according to wide
Physical layer network coding technique under adopted signal alignment can obtain improvement net for the illustraton of model that primary and secondary net is any number of users
Network spatial multiplexing gain and the scheme for improving system performance.
In order to achieve the above objects and other related objects, the present invention provides a kind of communication party based on signal space alignment
Method, in major network, for any one user M, the information number that user M is sent is M* (M-1), in secondary net, for any one
The information number that a user N, user N are sent is N/2, wherein M is more than or equal to 3, N more than or equal to 4, in major network, for any one
It is a to be sent and received with being able to carry out information per family, in secondary net, for any one user in 2N can only carry out signal transmission,
Any one user in 2N-1 can only carry out signal reception；The described method includes:
Each user passes through coded treatment to information to be sent, generates and sends signal, and the transmission signal is sent to
Relay node；
It is executed in the relay node: receiving the transmission signal and generate reception signal, and to the reception signal
It is obtained after being encoded and signal；
Signal receiving end eliminates the interference message received, obtains useful signal.
It is described to receive the transmission signal and generate the step of receiving signal in specific implementation of the invention, comprising:
Receive the transmission signal；
Determine receiving matrix, signal-to-noise ratio；
Based on the transmission receiving matrix and the signal-to-noise ratio, generates and receive signal.
In specific implementation of the invention, generates and receives embodying for signal are as follows:
Wherein, y[r]To receive signal, r is relay node, and N is number of users, H[N,r]The channel square of user N to relay node r
Battle array, VNSet of the user i to user's j precoding vectors, SNIt is set of the user i to user's j transmission signal vector, n[r]For relaying
The signal-to-noise ratio of node r.
It is described and signal to embody in specific implementation of the invention are as follows:
Wherein, M is main network users number, and N is time network users number, sM,M-1For the transmission signal of user M and user M-1.
In specific implementation of the invention, efficient message that the user 1 of master network receives are as follows:
The efficient message that the user 1 of secondary network receives are as follows:
Wherein, y11For major network useful signal,For secondary net useful signal, u1Represent 1 receiving matrix of major network user, n1Generation
The signal noise of table major network user 1, U1The receiving matrix of time network users 1 is represented,Represent the noise of time network users 1.
As described above, a kind of communication means based on signal space alignment provided in an embodiment of the present invention, it is intended to first with half
Duplexing relay node is reference, and transmitted in both directions process is divided into uplink phase and downlink phase, in the MAC stage mutually
In signal alignment to same dimension between the user of communication, relay node by interactive signal alignment to one convert subspace
And it designs relay node processing array and is broadcasted message in the BC stage.Therefore, in multi user wireless communication network, due to
Interference, data efficiency caused by multiple source node simultaneous transmissions can sharply decline.Using major network as Y-channel, secondary net is X channel and deposits
Two-way single relay node of network is system model figure, can be with according to the physical layer network coding technique under broad sense signal alignment
The scheme for improving multiplex network gain and improving system performance is obtained for the illustraton of model that primary and secondary net is any number of users.
Detailed description of the invention
Fig. 1 is a kind of a kind of flow diagram of communication means based on signal space alignment of the embodiment of the present invention.
Fig. 2 is a kind of another flow diagram of communication means based on signal space alignment of the embodiment of the present invention.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to Fig. 1-2.It should be noted that only the invention is illustrated in a schematic way for diagram provided in the present embodiment
Basic conception, only shown in schema then with related component in the present invention rather than component count, shape when according to actual implementation
Shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its component cloth
Office's kenel may also be increasingly complex.
As depicted in figs. 1 and 2, embodiment provides a kind of communication means based on signal space alignment, institute when of the invention
The method of stating includes:
S101, each user pass through coded treatment to information to be sent, generate and send signal, and the transmission signal is sent out
It send to relay node.
Based on each node there is global channel status information to remain unchanged, and node works in the feelings of semiduplex mode
Under condition, if relay node has Nr root antenna, each user has Nt root antenna, sends M-1 independent message.Whole process consumption 2
A time slot: uplink (MAC) stage and downlink (BC) stage.I-th of left side user sends to j-th of the right user
Signal is denoted as S[i,j].Then in the MAC stage, all nodes send message to relay node, and relay node will receive primary and secondary
Network M (M-1)+NN/2 independent signal in total.Calculate separately out the expression formula that primary and secondary net sends signal:
Major network sends signal representation:
Secondary net sends signal representation:
Wherein, v[j+1,i]Indicate the precoding vectors of the signal of user i to user j+1, s[j+1,i]Indicate user i to user j
+ 1 signal, M are the number of users of major network, and N is time number of users of net.
S102 is executed in the relay node: being received the transmission signal and is generated reception signal, and to the reception
Signal obtains after being encoded and signal.
In the MAC stage, the transmission signal of terminal is then sent to relay node by precoding, then relay node connects
The collection of letters number are as follows:
Wherein,Indicate that i-th of user to the channel matrix between relay node, and obeys mean value and be
Zero, variance σ2Multiple Gauss random distribution.n[r]∈CNr×1, indicate that mean value is zero, variance σ2Additive white Gaussian noise.
In the embodiment of the present invention, during signal is received, comprising: receive the transmission signal；Determine receiving matrix,
Signal-to-noise ratio；Based on the transmission receiving matrix and the signal-to-noise ratio, generates and receive signal.
Specifically, signal-to-noise ratio is preset according to channel, then relaying, which generates, receives embodying for signal are as follows:
Wherein, y[r]For relay reception signal, r is relay node, H[N,r]Channel matrix of the user N to relay node r, VN
Represent set of the user i to user's j precoding vectors, SNRepresent set of the user i to user's j transmission signal vector, n[r]For in
After the signal-to-noise ratio of node r.
At relay node, relay node is by receiving matrix A to y[r]Carry out linear process, it may be assumed that
Can be obtained according to physical-layer network coding theory at relaying between two two users couple to hair message and signal,
Then need to construct the receiving matrix A of relaying in relaying, with a1For, by taking master network as an example, by user 1 and 2 pairs of the user letters sent out
NumberIt is placed on the kernel for being made of matrix other channels and eliminates interference, it may be assumed that
The kernel that other users (user 1 and 3, user 1 and 4 etc.) constitute matrix to hair message is as follows:
By taking secondary network as an example, by user 1 and 2 pairs of the user signals sent outVector is placed on other channels and constitutes matrix
Kernel in and eliminate the interference between other channels, it may be assumed that
And so on, (such as user 1 and 4, user 1 and 6 etc.) between every two user is placed on other to the message vector of hair
Channel is constituted in the kernel of matrix to eliminate the interference from other channels, then is had:
By physical layer network compile in theory, carry out between two users information exchange and signal needs relaying
Place obtains, then the expression formula of relay reception signal can be rewritten as:
In the BC stage, relaying is intended to send signal required for obtaining, and needs successively to encode network, precoding vectors
Optimize processing, then again by amplification forwarding by the MAC stage connect in receive and handle and signalIt is broadcast to every
A receiving end.Then it is eliminated by the interference message that channel force zero receives each user, so that each user be made only to receive
The message sent to itself and itself received efficient message of needs.
If the transmission signal of relaying is Xr, it may be assumed that
Wherein, α is the amplification forwarding coefficient of relaying.The receiving matrix U that receiving end is constructed at receiving end utilizes reception square
U is to the signal processing received for battle array.By taking primary and secondary network users 1 as an example, receiving matrix treated the signal output of user 1 are as follows:
Wherein master network U1=[v[2,1],v[3,1]v[4,1]...v[M,1]]T, secondary network U1=[v[2,1],v[4,1],v[6,1]...v[N,1]]T,
Therefore primary and secondary net receives the expression formula of signal are as follows:
S103, signal receiving end eliminate the interference message received, obtain useful signal.
It is understood that obtaining effectively sending signal and broadcast, a kind of realization side of the invention based on described and signal
In formula, efficient message that the user 1 of master network receives are as follows:
The efficient message that the user 1 of network receives are as follows:
It is eliminated by the interference message that channel force zero receives each user, so that each user be made to receive only itself
The message of transmission and itself received efficient message of needs.
Complexity is for measuring system performance important indicator, by complexity it can be seen that antenna amount used
The benifit that spatial multiplex gains are improved.In the method for broad sense signal alignment GSA, to processing user between message interference and
The antenna of configuration user and relay node has used zero forcing algorithm.According to matrix theory: being the m * n matrix of r for order
A progress broad sense is inverted or singular value decomposition, and complexity is o (mnr)；If counted to the complexity of two matrix multiples
It calculates, and assumes that A matrix is the matrix of m × n, B matrix is the matrix of n × p, then its complexity is o (mnp).
Total complexity of MAC stage transmitting terminal are as follows:
CT1=CT11+CT12=o (M5+N5)
The BC stage acquires the total complexity of master network transmitting terminal are as follows:
CT=MCT1+CT2=o (M6+N5)
Receiving end is relay node in the MAC stage, the linear predictive coding of relay node from channel matrix and beam forming to
Moment matrix, which is multiplied, to be realized.The total complexity of relay node are as follows:
oR1=o (M5+N5)
Total complexity in the BC stage are as follows:
oR21=o (M5+N5)
The complexity of secondary network receiving terminal are as follows:
oR22=o (N5)
Total complexity in BC stage is C=CT+CRFormula substitutes into and handles to obtain:
C=CT+CR=o (M6+N5)
In the present invention, all channels are each assumed to perfect channel i.e. non-rayleigh fading channel, and transmitting terminal needs to meet
Power limitation condition, it is assumed that it is P that it, which sends power, so that each user acquisition noise variance is equal and is σ2.The BC stage, in
After treatment after the message that node is sent to each user, the received signal to noise ratio of each efficient message of user i and rate point
Not are as follows:
Rj=log2(1+SINRj)
In conclusion in the embodiment of the present invention, in multi user wireless communication network, due to multiple source node simultaneous transmissions
Caused interference, data efficiency can sharply decline.Using major network as Y-channel, secondary net is X channel and the two-way single relaying section for depositing network
Point is system model figure, can be any use for primary and secondary net according to the physical layer network coding technique under broad sense signal alignment
The illustraton of model of amount obtains the scheme for improving multiplex network gain and improving system performance.
Firstly, based on each node there is global channel status information to remain unchanged, and node works in half-duplex mould
In the case where formula, if relay node has Nr root antenna, each user has Nt root antenna, sends M-1 independent message.Whole process
Consume 2 time slots: uplink (MAC) stage and downlink (BC) stage.I-th of left side user is to j-th of the right user
The signal of transmission is denoted as S[i,j].Then in the MAC stage, all nodes send message to relay node, and relay node will receive
To primary and secondary network M (M-1)+NN/2 independent signal in total.The each user of major network sends information and generates transmission by precoding
Signal, all signals are then sent to relay node by precoding, and relay node, which generates, receives signal, and relay node is by connecing
Linear process is carried out to the reception signal generated at relay node by matrix to obtain and signal.Then the sum obtained at relay node
Signal carries out physical-layer network coding, then precoding processing obtains the transmission signal of relay node, finally in the BC stage by putting
By relay node, treated that message is broadcast to all users for big forwarding.Therefore, using the embodiment of the present invention, compared in traditional list
After the two-way single network of node, the present invention has studied the object for having and depositing channel relay node network model broad sense signal alignment algorithm
Layer network coding is managed, and analyzes two kinds of complexities being changed under broad sense signal alignment algorithm, calculates the calculation of broad sense signal alignment
Under method system and rate, through analysis shows, broad sense signal alignment algorithm with more improve system performance advantage.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (5)
1. a kind of communication means based on signal space alignment, which is characterized in that in major network, for any one user M, use
The information number that family M is sent is M* (M-1), and in secondary net, for any one user N, the information number that user N is sent is N/2,
Wherein, M is more than or equal to 3, N and is more than or equal to 4, in major network, is sent and received for any one with being able to carry out information per family, secondary
In net, signal transmission can only be carried out for any one user in 2N, any one user in 2N-1 can only carry out signal
It receives, which comprises
Each user passes through coded treatment to information to be sent, generates and sends signal, and the transmission signal is sent to relaying
Node；
It is executed in the relay node: receiving the transmission signal and generate reception signal, and the reception signal is carried out
It is obtained after coding and signal；
Signal receiving end eliminates the interference message received, obtains useful signal.
2. a kind of communication means based on signal space alignment according to claim 1, which is characterized in that the reception institute
It states and sends signal and generate the step of receiving signal, comprising:
Receive the transmission signal；
Determine receiving matrix, signal-to-noise ratio；
Based on the transmission receiving matrix and the signal-to-noise ratio, generates and receive signal.
3. a kind of communication means based on signal space alignment according to claim 2, which is characterized in that generate and receive letter
Number embody are as follows:
Wherein, y[r]To receive signal, r is relay node, and N is number of users, H[N,r]The channel matrix of user N to relay node r,
VNSet of the user i to user's j precoding vectors, SNIt is set of the user i to user's j transmission signal vector, n[r]For relaying section
The signal-to-noise ratio of point r.
4. a kind of communication means based on signal space alignment according to claim 3, which is characterized in that described and signal
Embody are as follows:
Wherein, M is main network users number, and N is time network users number, sM,M-1For the transmission signal of user M and user M-1.
5. a kind of communication means based on signal space alignment according to claim 4, which is characterized in that effective letter
Number embody and include:
Wherein,For major network useful signal,For secondary net useful signal, u1Represent 1 receiving matrix of major network user, n1Represent master
The signal noise of network users 1, U1The receiving matrix of time network users 1 is represented,Represent the noise of time network users 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821362A (en) * | 2006-10-17 | 2012-12-12 | 华为技术有限公司 | Method and system for controlling multicast broadcast service |
| US20110151874A1 (en) * | 2009-12-17 | 2011-06-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Link report relay in access division multiplexing systems |
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