CN103199959B - A kind of network coding method in collaboration communication - Google Patents
A kind of network coding method in collaboration communication Download PDFInfo
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- CN103199959B CN103199959B CN201310127519.1A CN201310127519A CN103199959B CN 103199959 B CN103199959 B CN 103199959B CN 201310127519 A CN201310127519 A CN 201310127519A CN 103199959 B CN103199959 B CN 103199959B
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Abstract
The invention discloses the network coding method in a kind of collaboration communication, the method includes: without direct channel between two source nodes, they intercourse information, repeated node relay forwarding, two the source node bpsk signals received are simulated multiplying by relay point, as the network code signal of two source node bpsk signals, analogue multiplication operation result is respectively sent to the other side's source node, and two source nodes go out, according to the signal extraction that this locality sends, the signal that the other side's source node sends.The via node of the present invention need not, to source node signal interpretation, therefore protect the information security of source node signal.
Description
Technical field
The present invention relates generally to radio communication physical-layer techniques, more particularly, relate to physical layer collaborative network coding techniques and receive Technology of Judgment.
Background technology
In the physical layer of radio communication, use MIMO technology can improve the capacity of wireless communication system, obtain certain space diversity gain.But mobile terminal is limited by volume, it is not suitable for using multiple antennas, therefore A.Sendonaris, J.N.Laneman et al. propose to use cooperative communication technology in the physical layer of radio communication respectively, and this technology utilizes the via node collaborative work of multiple free time, it is achieved " virtual " MIMO.In collaboration communication, owing to needing via node source node the to be forwarded signal of free time, therefore the handling capacity of communication system reduces.Research shows, by network coding technique and collaboration communication, can effectively improve the handling capacity of cooperation communication system.In the collaboration communication using network code, idle relay node, the signal of multiple source nodes is carried out network code, then forwards.Owing to, in traditional collaboration communication, via node once forwards the signal of a source node, throughput of system reduces 50%, and uses network coding technique, and via node once can forward the signal of multiple source node, therefore can improve at throughput of system.
Realize network code it is crucial that via node carries out allied signal process to the signal of multiple source nodes.Current cooperative network code implementation method can be divided into digital method based on XOR and analogy method based on additive operation two kinds.Wherein in digital method, two source signals need to be demodulated receiving by via node, can eliminate noise accumulation, improves the reception error performance of system, but it is high to realize technical sophistication degree, and, once via node receives and makes mistakes, and can reduce systematic function on the contrary.Analogy method realizes simple, and the reception error performance of its system is slightly worse than digital method；Via node cannot carry out power control to signal, it is impossible to realizes the optimization of systematic function；Simultaneously when the technology of software radio realizes, the technical difficulty that its demodulation receives is bigger.
The present invention uses multiplying to realize analog network coding in cooperation communication system.
Summary of the invention
It is an object of the invention to provide and a kind of realize the new method of network coding technique in wireless co-operative communication.Compared with existing network coding method, performance is suitable, it is achieved simple.Weak point is that the present invention needs wireless communication system to be time division multiplex system.
Realize the technical scheme is that the network coding method in a kind of collaboration communication, without direct channel between two source nodes, they intercourse information, repeated node relay forwarding, two the source node bpsk signals received are simulated multiplying by relay point, as the network code signal of two source node bpsk signals, analogue multiplication operation result is respectively sent to the other side's source node, and two source nodes go out, according to the signal extraction that this locality sends, the signal that the other side's source node sends.
As a further improvement on the present invention, after described relay point carries out power adjustments to network code signal, retransmit to the other side's source node.
The present invention provides a kind of in wireless co-operative communication system, uses the method that analogue multiplication computing realizes network coding technique.Using analogue technique to realize the network code of two bpsk signals, the demodulation simultaneously using simple technology can realize signal at receiving terminal receives.
To BPSK modulating system, source node SiSend binary information code and be represented by di(m) ∈ 0,1}, wherein m=1,2 ..., M, M are that each time slot sends data length, then systems baseband transmitting signal is represented by si(m)=1-2di(m).Such as node SiLaunch signal, SjReceive signal, then S in radio communicationjThe signal received is represented by:
rij(m)=hij(m)si(m)+nij(m) (1)
H in formulaijM () is the fading coefficients of channel, nijM channel additive white noise that () is.
Assume that source node is respectively S in a wireless cooperation system1、S2, via node is S3, then in traditional network code, via node first has to the signal to source node and decodes respectively or joint decoding, obtains the XOR value of two source node identification codes, then forwards.And the two source node signals received directly are done multiplication operation by via node of the present invention, obtain:
s'3=r13r23(2)
=heq3s1s2+neq3
H in formulaeq3=h13h23For relaying the equivalent channel fading coefficients of signal, neq3=(h13s1n23+h23s2n13+n13n23) for relaying the equivalent noise of signal.Due in BPSK modulating systemI.e. the product of bpsk signal is equal to the XOR of its information bit, and therefore formula (2) can regard amplification as is heq3Network code signal.
Due to the multiplication algorithm of two signals in (2) formula, Analog Electronics Technique can be used in a wireless communication system to realize, the complexity of its algorithm is more greatly simplified than traditional digital method.
Beneficial effect: the present invention provides a kind of new simple wireless cooperative network coded method, realizes from solution principle and technology, the method have the advantages that
(1) a kind of new method using multiplication algorithm to realize Wireless Network Coding is proposed.
(2) Analog Electronics Technique can be used to realize, algorithm is simple, it is easy to technology realizes.
(3) via node need not, to source node signal interpretation, therefore protect the information security of source node signal.
Accompanying drawing explanation
Fig. 1 shows the two-way cooperative relay system that can implement the present invention.
Fig. 2 shows the error performance of inventive algorithm.
Fig. 3 shows the impact on inventive algorithm performance of the different channels characteristic.
Detailed description of the invention
The present invention provides a kind of Wireless Network Coding method based on multiplying, in the cooperation communication system of the wireless two-way that can be used for Fig. 1, two source node S in Fig. 11And S2Between without direct channel, they intercourse information, need repeated node S3Relay forwarding.h13For S1-S3 channel fading power coefficient, h23For S2-S3 channel fading power coefficient, h31For S3-S1 channel fading power coefficient, h32For S3-S2 channel fading power coefficient.
Specific implementation method includes:
(1) collaboration communication agreement is set up.Using BPSK modulation system, use time division multiplex cooperation scheme, a Frame has 3 time slots, the first source node S1, the second source node S2First and second time slots at Frame send data to via node respectively；
(2) via node S3Carry out network code.Via node S3To receive from the first source node S1, the second source node S2Signal s1、s2, use formula (2) to carry out multiplying, it is achieved analog network coding.
s'3=r13r23(2)
=heq3s1s2+neq3
H in formulaeq3=h13h23For relaying the equivalent channel fading coefficients of signal, neq3=(h13s1n23+h23s2n13+n13n23) for relaying the equivalent noise of signal.
(3) amplification forwarding agreement is set up.For controlling the transmitting power of via node, amplification-forwarding (AF) coordination strategy need to be used, the network code signal of formula (2) is carried out power adjustments.Having kinds of schemes selective, the average emitted power generally controlling via node is 1.Assume the noise n of each channelij(m) be variance be NijAdditive white Gaussian noise, then via node transmitting baseband signal can be enlarged into:
s3=s'3(Neq3+|heq3|2)-1/2(3)
Wherein Neq3=|h13|2N23+|h23|2N13+N13N23。
(4) decoding is received.At the 3rd time slot via node S3Forward relay node transmitting baseband signal s3, first, second source node S simultaneously1、S2Receive signal respectively, utilize local signal, the first source node S1, the second source node S2Can be from network code signal s3Middle acquisition receives signal.With source node S1Reception signal as a example by illustrate decoding algorithm:
Source node S1Reception signal be
r31=h31s3+n31(4)
=heq1s1s2+neq1
H in formulaeq1=h31heq3(Neq3+|heq3|2)-1/2, neq1=h31(Neq3+|heq3|2)-1/2neq3+n31, neq1Variance Neq1=|h31|2(Neq3+|heq3|2)-1Neq3+N31.S in formula (4)1Signal is launched, for known signal, therefore source node S for this locality1Do following judgement, can be about s2Reception signal:
Fig. 2 and Fig. 3 is shown in the performance evaluation of this embodiment, as comparing the result giving theory analysis, and the result (NCR) of digital network coding.The inventive method (AFNCR) and digital network coded method (NCR) have suitable error performance as seen from Figure 2.In the case of middle SNR (0dB < SNR < 20dB in such as figure), owing to AFNCR uses analogue technique to realize, there is noise storage when forwarding in via node, the performance of NCR is slightly better than the performance of AFNCR；Along with SNR becomes big, the impact of noise storage reduces, and the performance of AFNCR is improved；And along with SNR reduces, NCR increases in the network code mistake of via node, the error code of NCR is caused to increase, so at low SNR, two schemes performance is almost identical.It addition, in the case of high SNR (10dB < SNR in such as figure), notional result and simulation result have the most identical.Using the identical situation of two channel SNR as reference in Fig. 3, the most respectively by h13And h23SNR reduce half, compare the error performance in the case of 3 kinds.As seen from the figure, h13SNR to S1Receptivity have large effect, this point and theoretical analysis result to be identical.
Particular embodiments described above; purpose, technical scheme and the beneficial effect of invention is further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; it is not restricted to the present invention; all within present invention spirit and principle, any amendment of being made, equivalent etc., should be included within the scope of the present invention.
Claims (3)
1. the network coding method in a collaboration communication, without direct channel between two source nodes, they intercourse information, repeated node relay forwarding, it is characterized in that, two source node bpsk signals that relay point will receive are simulated multiplyings, and as the network code signal of two source node bpsk signals, analogue multiplication operation result is respectively sent to the other side's source node, and two source nodes go out the signal of the other side's source node transmission according to the signal extraction that this locality sends.
Network coding method in collaboration communication the most according to claim 1, is characterized in that, after described relay point carries out power adjustments to network code signal, retransmits to the other side's source node.
Network coding method in collaboration communication the most according to claim 1, is characterized in that, the method specifically includes following steps:
(1) using BPSK modulation system, use time division multiplex cooperation scheme, a Frame has 3 time slots, the first source node (S1), the second source node (S2) respectively first and second time slots at Frame send data to via node；
(2) via node S3To receive from the first source node S1, the second source node S2Signal s1、s2, use formula (2) to carry out multiplying, it is achieved analog network coding；
s′3=r13r23(2)
=heq3s1s2+neq3
In formula, r13Represent the first source node S1Transmitting, via node S3The signal received, r23Represent S2Node is launched, via node S3The signal received, heq3=h13h23For relaying the equivalent channel fading coefficients of signal, neq3=h13s1n23+h23s2n13+n13n23For relaying the equivalent noise of signal, h13For S1-S3Channel fading power coefficient, h23For S2-S3Channel fading power coefficient, h31For S3-S1Channel fading power coefficient, h32For S3-S2Channel fading power coefficient, n13For S1-S3Channel additive white noise, n23For S2-S3Channel additive white noise；
(3) the network code signal of formula (2) is carried out power adjustments, obtain via node transmitting baseband signal s3；
(4) at the 3rd time slot via node S3Forward relay node transmitting baseband signal s3, first, second source node S simultaneously1、S2Receive signal respectively, utilize local signal, the first source node S1, the second source node S2From network code signal s3' middle acquisition respective reception signal.
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