CN107154818B - Co-channel full duplex bi-directional relaying transmission method while based on single carrier frequency domain equalization - Google Patents

Co-channel full duplex bi-directional relaying transmission method while based on single carrier frequency domain equalization Download PDF

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CN107154818B
CN107154818B CN201710225019.XA CN201710225019A CN107154818B CN 107154818 B CN107154818 B CN 107154818B CN 201710225019 A CN201710225019 A CN 201710225019A CN 107154818 B CN107154818 B CN 107154818B
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source node
signal
node
relay node
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CN107154818A (en
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刘毅
戴悦
肖玲玲
康策
马莹
张海林
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Xian University of Electronic Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0256—Channel estimation using minimum mean square error criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03617—Time recursive algorithms
    • H04L2025/03624—Zero-forcing

Abstract

Co-channel full duplex bi-directional relaying transmission method while the present invention discloses one kind based on single carrier frequency domain equalization mainly solves the problems, such as to increase relay node complexity because handling remaining self-interference in prior art.Its technical solution includes: 1) to estimate channel parameter；2) optimal relay node is selected using the channel coefficients that estimation obtains；3) the optimal amplification factor of optimal relay node is calculated；4) the optimal equivalent multipath channel of relay node is constructed；5) source node modulate emission signal；6) optimal relay node forwarding source node emits signal；7) source node carries out frequency domain equalization to signal is received using the equivalent multipath channel of optimal relay node；8) the reception signal after source node demodulation is balanced, recovery obtain source signal.This invention simplifies relay node treatment processes, improve system Signal to Interference plus Noise Ratio most possibly, to improve while the reliability of co-channel full duplex bidirectional relay system, can be used for the distributed collaborative Transmission system wirelessly communicated.

Description

Co-channel full duplex bi-directional relaying transmission method while based on single carrier frequency domain equalization
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of full duplex bi-directional relaying transmission method can be used for The distributed collaborative Transmission system of wireless communication promotes the reliability and the availability of frequency spectrum of cooperation communication system.
Background technique
As signals in wireless communications bandwidth is more and more wider, corresponding frequency spectrum resource is fewer and fewer, and people gradually start Research can maximally utilize the algorithm and technology of frequency spectrum resource.Full duplex technology carries out signal on same time and same frequency range Transmitting and reception, therefore it can improve the frequency spectrum resource utilization rate of future wireless system network most possibly, but it exists Serious self-interference problem, is promoted which has limited full duplex system performance.Cooperative communication technology utilizes the free time in communication network Node realizes Virtual space diversity as relaying to fight the multipath fading of wireless channel, cooperating relay communication is because relaying cloth The advantages that office is flexible, at low cost has become one of the key technology of current and future Development of Wireless Communications.
Document 1, Two-Way Full-Duplex Amplify-and-Forward Relaying, MILCOM 2013- To complete double in 2013IEEE Military Communications Conference, San Diego, CA, 2013, pp.1-6. Work order relaying bidirectional transmission system model is analyzed, and to a fixed relay is relied on, is in the case where no relay selection The parameters such as system transmission rate, capacity, outage probability are emulated.But requirement of single relay transmission method to transmission environment compared with Height, different objects stop the shadow fading to be formed that can all produce a very large impact to the transmission of information in transmission process, and system is reliable Property is lower.
Document 2, Relay Selection for Two-Way Full Duplex Relay Networks With Amplify-and-Forward Protocol,in IEEE Transactions on Wireless Communications, A kind of relay selection strategy is proposed for more relay scenes in vol.13, no.7, pp.3768-3777, July2014., and right The performances such as full duplex relaying error rate of system, outage probability are analyzed.But shortcoming existing for this method is to have ignored Remaining self-interference signal is relayed the fact relaying Infinite Cyclic iteration between dual-mode antenna, remaining self-interference channel will be relayed and built Mould is single diameter Rayleigh flat fading channel, cannot objectively react full duplex relaying residue self-interference completely to the shadow of its performance It rings.
Document 3, in the patent of its application, " asynchronous space -time code is compiled in full-duplex cooperative communication system for Xian Electronics Science and Technology University One kind is proposed in decoding system and method " (patent No.: ZL201210199103.6 publication number: CN 102724027B) to be based on The full duplex relaying transmission method of asynchronous space -time code, this method using asynchronous space -time code encoding and decoding technique to relay node residue from Interference signal is inhibited and is eliminated, and this full duplex relaying transmission method is disadvantageous in that: full duplex collaboration communication system Relay node is increased to the complexity of remaining self-interference signal treatment process using asynchronous space -time code decoding method in system.
Summary of the invention
It is an object of the invention to overcome the shortcomings of above-mentioned prior art, propose a kind of based on the same of single carrier frequency domain equalization When co-channel full duplex bi-directional relaying transmission method promoted complete with simplifying relay node to the treatment process of remaining self-interference signal The reliability of duplexing bi-directional relaying cooperation communication system.
To achieve the above object, technical scheme is as follows:
(1) two source node S 1, S2 and relay node R1,R2,…,Ri,…,RNSystem channel is joined using training sequence Number carries out Minimum Mean Squared Error estimation, obtains following parameter:
The channel coefficients h of first source node S, 1 to i-th relay node1iWith 2 to i-th relay node of the second source node S Channel coefficients h2i, the remaining self-interference channel coefficient h of the first source node S 1S1Believe with the remaining self-interference of the second source node S 2 Road coefficient hS2And relay node residue self-interference channel coefficientI=1,2 ..., N, N are relaying number；
(2) optimal relay node R is selectedk, wherein k indicates the inferior horn scale value of optimal relay node；
(3) optimal relay node R is calculatedkOptimal amplification factor βk:
When | h2k|2≥|h1k|2When,
When | h1k|2> | h2k|2When,
Wherein, h1kIndicate that the first source node S 1 arrives the channel coefficients of optimal relay node, h2kIndicate that the second source node S 2 arrives The channel coefficients of optimal relay node,Indicate the noise variance of the first source node S 1,Indicate making an uproar for the second source node S 2 Sound variance,Indicate the noise variance of optimal relay node, Indicate the remaining word interference of optimal relay node Channel coefficients, L indicate the circulating prefix-length of source node transmitting signal addition；
(4) the optimal big amplification factor β of optimal relay node is utilizedk, construct the equivalent multipath channel of optimal relay node Channel coefficient matrix hk:
hk=[h (0) ..., h (l) ..., h (L-1)],
Wherein, h (l)=βk(hLIkβk)lIndicate the channel coefficients of l diameter equivalent channel, 0≤l≤L；
After (5) first source node Ss 1 and the second source node S 2 are respectively modulated respective source signal, then add and follow Ring prefix obtains respective transmitting signal x1And x2, and by respective transmitting signal x1And x2It is sent to optimal relay node Rk；
(6) optimal relay node RkSignal x is emitted to the two1And x2Processing is amplified, optimal relay node is obtained The transmitting signal t [m] of m time slot:
Wherein, x1[m-j] indicates the transmitting signal of 1 m-j time slot of the first source node S, x2[m-j] indicates the second source node The transmitting signal of S2 m-j time slot, nk[m-j] indicates the noise signal of optimal relay node m-j time slot, j=1,2 ... ∞；
(7) first source node Ss 1 and the second source node S 2 receive the transmitting signal t [m] of optimal relay node, obtain respectively Reception signal y1And y2, then removal receives signal y respectively1And y2Cyclic prefix obtain the letter to be equalized of the first source node S 1 Number y'1With the signal y' to be equalized of the second source node S 22；
(8) first source node Ss 1 and the second source node S 2 are respectively to respective signal y' to be equalized1And y'2It is equal to carry out frequency domain Weighing apparatus, obtains the signal to be demodulated of the first source node S 1With the signal to be demodulated of the second source node S 2
(9) first source node Ss 1 are to its signal to be demodulatedIt is demodulated, the source signal a as the second source node S 22, Second source node S 2 is to its signal to be demodulatedIt is demodulated, the source signal a as the first source node S 11。
The invention has the following advantages over the prior art:
First, the remaining self-interference channel of relay node is equivalent to L diameter multipath channel by the present invention, and is utilized in source node SC-FDE anti-multipath technical antagonism relays the multipath effect that remaining self-interference is formed, to simplify relay node to remaining from dry The treatment process for disturbing signal reduces the complexity of relay node.
Second, present invention uses relay selection technology, i.e. source node selects one most from multiple candidate relay nodes Excellent relaying carries out collaboration communication and improves the reliability of system to improve the Signal to Interference plus Noise Ratio of source node.
Detailed description of the invention
Fig. 1 is co-channel full duplex two-way communication schematic diagram of a scenario while the present invention uses；
Fig. 2 is implementation flow chart of the invention；
Fig. 3 is the bit error rate contrast simulation figure of the present invention and existing method.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Of the invention is realized under the scene of Fig. 1.
In Fig. 1, includes two source nodes and N number of relay node, respectively there is two channels, source between source node and each relaying Node and relay node respectively have a remaining self-interference channel, in which:
S1 indicates that the first source node, S2 indicate the second source node, R1,R2,…Ri,…,RNIndicate N number of relay node, i= 1,2 ... N, N indicate relaying number；Solid line indicates that the transmission channel between source node and relay node, dotted line indicate each in Fig. 1 Node residue self-interference channel.
Source node and relay node all work co-channel full duplex mode at the same time, and two source nodes are simultaneously with frequency to relaying Node transmitting signal simultaneously receives the transmitting signal of relay node, and relay node is also simultaneously with reception frequently from two source nodes Emit signal, relay node uses amplification forwarding agreement, the reception signal of a upper time slot is transmitted to source after enhanced processing The remaining self-interference signal of node, source node and relay node refers to using remaining after active or passive self-interference technology for eliminating Remaining self-interference signal.
Referring to Fig. 2, the present invention completes the realization of co-channel full duplex bi-directional relaying collaboration communication simultaneously, and steps are as follows:
Step 1, estimate channel parameter.
Two source node Ss 1, S2 and relay node R1,R2,…,Ri,…,RNUsing training sequence to system channel parameter into Row Minimum Mean Squared Error estimation obtains following parameter:
The channel coefficients h of first source node S, 1 to i-th relay node1iWith the letter of the second source node S 2 to i-th relaying Road coefficient h2i, the remaining self-interference channel coefficient h of the first source node S 1S1With the remaining self-interference channel system of the second source node S 2 Number hS2And relay node residue self-interference channel coefficientI=1,2 ..., N, N is relaying number, and source node and relaying save Channel information between point is symmetrical, i.e. channel coefficients h of i-th of the relay node to the first source node S 1i1With the first source node S 1 To the channel coefficients h of i-th of relay node1iIt is equal, channel coefficients h of i-th of relay node to the second source node S 2i2With The channel coefficients h of two source node Ss 2 to i-th relaying2iIt is equal, h1i=hi1, h2i=hi2。
Step 2, optimal relay node is selected.
2.1) the channel coefficients h of 1 to i-th relay node of the first source node S is utilized1iWith the second source node S 2 to i-th The channel coefficients h of relaying2i, calculate the inferior horn scale value of optimal relay node:Wherein, | | table To show and seeks parameter modulus value, min () expression takes minimum value in two parameters,Expression takes maximum value in N number of parameter；
2.2) according to k-th of relay node R of the inferior horn scale value k of optimal relay node selectionkFor optimal relay node.
Step 3, optimal relay node R is calculatedkOptimal amplification factor βk。
3.1) the Signal to Interference plus Noise Ratio ψ of the first source node S 1 is calculated1With the Signal to Interference plus Noise Ratio ψ of the second source node S 22:
Wherein, h1kIndicate that the first source node S 1 arrives the channel coefficients of optimal relay node, h2kIndicate that the second source node S 2 arrives The channel coefficients of optimal relay node,Indicate that the remaining self-interference channel coefficient of optimal relay node, β indicate optimal relaying The amplification factor of node,Indicate the noise variance of the first source node S 1,Indicate the noise variance of the second source node S 2,Indicate that the noise variance of optimal relay node, L indicate the circulating prefix-length of source node transmitting signal addition；
3.2) system Signal to Interference plus Noise Ratio is enabled to obtain the optimal amplification factor β of maximum valuekExpression formula are as follows:
Wherein,Expression takes the value for the amplification factor β for making expression formula reach maximum value；
By the Signal to Interference plus Noise Ratio ψ of the first source node S 11With the Signal to Interference plus Noise Ratio ψ of the second source node S 22Bring optimal amplification factor β intok Expression formula, be derived by optimal amplification factor βkClosed solutions:
When | h2k|2≥|h1k|2When,
When | h1k|2> | h2k|2When,
Wherein,
Step 4, the equivalent multipath channel of optimal relay node is constructed.
The remaining self-interference channel of optimal relay node is equivalent to L diameter multipath channel, most using optimal relay node Excellent amplification factor βk, construct the channel coefficient matrix h of the equivalent multipath channel of optimal relay nodek:
hk=[h (0) ..., h (l) ..., h (L-1)],
Wherein,Indicate the channel coefficients of l diameter equivalent channel, 0≤l≤L.
Step 5, source node modulates source signal.
First source node S 1 is to source signal a1It is modulated, then by modulated signal sequence s1Cyclic prefix is added, is obtained To the transmitting signal of the first source node:And by transmitting signal x1It is sent to optimal relay node Rk；
Second source node S 2 is to source signal a2It is modulated, then by modulated signal sequence s2Cyclic prefix is added, is obtained To the transmitting signal of the second source node:And by transmitting signal x2It is sent to optimal relay node Rk,
Wherein, IPIndicate that the unit matrix of M × M dimension, M indicate modulation postamble sequence s1And s2Length, I ' is by unit Matrix IPRear L row constitute matrix, L indicate source node transmitting signal addition circulating prefix-length, L < M.
Step 6, the transmitting signal of optimal relay node forwarding source node.
The reception signal r [m] of optimal relay node m time slot:
Wherein, x1[m] indicates the transmitting signal of 1 m time slot of the first source node S, x2When [m] indicates the second 2 m of source node S The transmitting signal of gap, t [m] indicate the transmitting signal of optimal relay node m time slot, nkWhen [m] indicates optimal relay node m The noise signal of gap；
Optimal relay node uses the operating mode of amplification forwarding, amplifies to the reception signal r [m-1] of its m-1 time slot βkTimes, obtain the transmitting signal t [m] of optimal relay node m time slot:
T [m]=βkR [m-1],
Wherein,x1[m-1] indicates the first source The transmitting signal of node S1 m-1 time slot, x2[m-1] indicates the transmitting signal of 2 m-1 time slot of the second source node S, t [m-1] table Show the transmitting signal of optimal relay node m-1 time slot, nk[m-1] indicates the noise signal of optimal relay node m-1 time slot；
It brings the expression formula that optimal relay node m-1 time slot receives signal r [m-1] into t [m] expression formula, obtains t [m] Expansion:
From the above equation, we can see that relaying remaining self-interference signal can form infinitely between the transmitting terminal and receiving end of relay node The process of loop iteration；Therefore single-carrier wave frequency domain equalization technology can be recycled using cyclic prefix confrontation multipath effect in above formula Signal within prefix length L diameter regards useful signal, and L+1 diameter and later signal regard self-interference signal.
Step 7, source node receives the transmitting signal of optimal relay node.
7.1) the first source node S 1 and the second source node S 2 receive the transmitting signal t [m] of optimal relay node, obtain respectively The reception signal y of m time slot1[m] and y2[m]:
y1[m]=h1kt[m]+hS1x1[m]+nS1[m],
y2[m]=h2kt[m]+hS2x2[m]+nS2[m],
Wherein, x1[m] indicates the transmitting signal of 1 m time slot of the first source node S, x2When [m] indicates the second 2 m of source node S The transmitting signal of gap, nS1[m] indicates the noise signal of 1 m time slot of the first source node S, nS2[m] indicates 2 m of the second source node S The reception signal of time slot；
7.2) two source nodes remove respectively respectively receives signal y1And y2Cyclic prefix, obtain the first source node S 1 Signal y' to be equalized1With the signal y' to be equalized of the second source node S 22:
y'1=[T IP]y1,
y'2=[T IP]y2,
Wherein, T indicates that M × L ties up null matrix, IPIndicate that M × M ties up unit matrix, M indicates modulation postamble sequence s1And s2's Length, L indicate the circulating prefix-length of source node transmitting signal addition, L < M, y1Indicate the reception signal of source node S 1, y2Source The reception signal of node S2, y'1Indicate that the first source node S 1 removes the signal to be equalized after cyclic prefix, y'2Indicate that the second source is saved Point S2 removes the signal to be equalized after cyclic prefix.
Step 8, source node signal to be equalized carries out frequency domain equalization, obtains signal to be demodulated.
The method of frequency domain equalization includes zero forcing equalization and least mean-square error equilibrium etc., and two source nodes use in this example The method of zero forcing equalization, implementation step are as follows:
8.1) the first source node S 1 and the second source node S 2 are respectively to respective signal y' to be equalized1And y'2Carry out Fourier Transformation, obtains the frequency-domain received signal Y' of the first source node S 11With the frequency-domain received signal Y' of the second source node S 22；
8.2) using zero forcing equalization respectively to frequency-domain received signal Y'1And Y'2Carry out balanced, the reception letter after being equalized Number Y1And Y2:
Y1=Y '1W,
Y2=Y '2W,
Wherein,Indicate that zero forcing equalization matrix, H (l) indicate l diameter etc. Imitate the frequency domain response of channel coefficients h (l), 0≤l≤L-1；
8.3) the first source node S 1 and the second source node S 2 are respectively to the reception signal Y after equilibrium1And Y2It is inverse to carry out Fourier Transformation, obtains the signal to be demodulated of the first source node S 1With the signal to be demodulated of the second source node S 2
Step 9, source node demodulated received signal.
First source node S 1 is to its signal to be demodulatedIt is demodulated, the source signal a as the second source node S 22, the Two source node Ss 2 are to its signal to be demodulatedIt is demodulated, the source signal a as the first source node S 11, complete entire complete double Work bi-directional relaying transmission process.
Effect of the invention is described in detail below with reference to emulation.
1. simulated conditions
Emulation experiment of the invention is carried out under 7.11 software of MATLAB.In emulation experiment of the invention, source section Point is modulated source signal using the method for quadrature amplitude modulation, the transmitting signal frame length M=128 modulated, circulation The length L=32 of prefix.The remaining self-interference channel of source node to channel and each node between relay node is that Rayleigh is flat The remaining self-interference size of smooth fading channel, relay node and two source nodes is -40dB, and each node noise variance is equal, It and is -40dB.Emulation SNR ranges are 0~18dB, and simulation times are 10000 times.
2. emulation content and simulation result
It is two-way to the full duplex using control methods and the mentioned method of the present invention in the mentioned method of document 2 as control methods The bit error rate performance of relay transmission system carries out simulation comparison, as a result as shown in Figure 3.As seen from Figure 3, when relaying number is When 3, the present invention improves about 4dB than the bit error rate performance of control methods, when relaying number is 5, the present invention and control methods Compared to the raising that its bit error rate performance has 5dB,
Simulation result shows: using the full duplex bi-directional relaying Transmission system of the method for the present invention, its bit error rate performance is obviously excellent In the bit error rate performance for the full duplex bi-directional relaying Transmission system for using control methods, illustrate that the present invention is simplifying relaying residue certainly While interfering treatment process, system reliability is improved.

Claims (5)

1. one kind is based on co-channel full duplex bi-directional relaying transmission method while single carrier frequency domain equalization, comprising:
(1) two source node S 1, S2 and relay node R1,R2,…,Ri,…,RNSystem channel parameter is carried out using training sequence Minimum Mean Squared Error estimation obtains following parameter:
The channel coefficients h of first source node S, 1 to i-th relay node1iWith the letter of 2 to i-th relay node of the second source node S Road coefficient h2i, the remaining self-interference channel coefficient h of the first source node S 1S1With the remaining self-interference channel system of the second source node S 2 Number hS2And relay node residue self-interference channel coefficientN is relaying number；
(2) optimal relay node R is selectedk, wherein k indicates the inferior horn scale value of optimal relay node；
(3) optimal relay node R is calculatedkOptimal amplification factor βk:
When | h2k|2≥|h1k|2When,
When | h1k|2> | h2k|2When,
Wherein, h1kIndicate that the first source node S 1 arrives the channel coefficients of optimal relay node, h2kIt is optimal to indicate that the second source node S 2 arrives The channel coefficients of relay node,Indicate the noise variance of the first source node S 1,Indicate the noise side of the second source node S 2 Difference,Indicate the noise variance of optimal relay node, Indicate the remaining self-interference channel of optimal relay node Coefficient, L indicate the circulating prefix-length of source node transmitting signal addition；
(4) the optimal big amplification factor β of optimal relay node is utilizedk, construct the channel system of the equivalent multipath channel of optimal relay node Matrix number hk:
hk=[h (0) ..., h (l) ..., h (L-1)],
Wherein,Indicate the channel coefficients of l diameter equivalent channel, 0≤l < L；
After (5) first source node Ss 1 and the second source node S 2 are respectively modulated respective source signal, then before adding circulation Sew to obtain respective transmitting signal x1And x2, and by respective transmitting signal x1And x2It is sent to optimal relay node Rk；
(6) optimal relay node RkSignal x is emitted to the two1And x2Processing is amplified, when obtaining optimal relay node m The transmitting signal t [m] of gap:
Wherein, x1[m-j] indicates the transmitting signal of 1 m-j time slot of the first source node S, x2[m-j] indicates the second source node S 2 the The transmitting signal of m-j time slot, nk[m-j] indicates the noise signal of optimal relay node m-j time slot, j=1,2 ... ∞；
(7) first source node Ss 1 and the second source node S 2 receive the transmitting signal t [m] of optimal relay node, obtain respective connect Collection of letters y1And y2, then removal receives signal y respectively1And y2Cyclic prefix obtain the signal y ' to be equalized of the first source node S 11 With the signal y ' to be equalized of the second source node S 22；
(8) first source node Ss 1 and the second source node S 2 are respectively to respective signal y ' to be equalized1With y '2Frequency domain equalization is carried out, is obtained To the signal to be demodulated of the first source node S 1With the signal to be demodulated of the second source node S 2
(9) first source node Ss 1 are to its signal to be demodulatedIt is demodulated, the source signal a as the second source node S 22, second Source node S 2 is to its signal to be demodulatedIt is demodulated, the source signal a as the first source node S 11。
2. wherein selecting optimal relay node R in step (2) according to method described in claims 1k, as follows into Row:
(2a) utilizes the channel coefficients h of 1 to i-th relay node of the first source node S1iIt is relayed with the second source node S 2 to i-th Channel coefficients h2i, calculate the inferior horn scale value of optimal relay node:Wherein, | | expression is asked Parameter modulus value, min () expression take minimum value in two parameters,Expression takes maximum value in N number of parameter；
(2b) selects k-th of relay node R according to the inferior horn scale value k of optimal relay nodekFor optimal relay node.
3. wherein two source nodes follow the addition of modulated signal in step (5) according to method described in claims 1 Ring prefix carries out according to the following formula:
Wherein, s1Indicate the modulated signal of the first source node S 1, x1Indicate the transmitting signal of the first source node S 1, s2Indicate the The modulated signal of two source node S 2, x2Indicate the transmitting signal of the second source node S 2, IPIndicate the unit matrix of M × M dimension, M table Show modulation postamble sequence s1And s2Length, I ' is by IPRear L row constitute matrix, L indicate source node transmitting signal addition Circulating prefix-length, L < M.
4. according to method described in claims 1, wherein in step (7) before the circulation of two source node removal reception signals Sew, carry out according to the following formula:
y′1=[T IP]y1,
y′2=[T IP]y2,
Wherein, T indicates that M × L ties up null matrix, IPIndicate that M × M ties up unit matrix, M indicates modulation postamble sequence s1And s2Length, L indicates the circulating prefix-length of source node transmitting signal addition, L < M, y1Indicate the reception signal of source node S 1, y2Source node S 2 Reception signal, y '1Indicate that the first source node S 1 removes the signal to be equalized after cyclic prefix, y '2Indicate that the second source node S 2 is gone Signal to be equalized after falling cyclic prefix.
5. wherein the first source node S 1 in step (8) and the second source node S 2 are divided according to method described in claims 1 It is other to respective signal y ' to be equalized1With y '2Frequency domain equalization is carried out, is carried out as follows:
(8a) the first source node S 1 and the second source node S 2 treat equalizing signal y ' respectively1With y '2Fourier transformation is carried out, is obtained The frequency-domain received signal Y ' of first source node S 11With the frequency-domain received signal Y ' of the second source node S 22；
(8b) is respectively to two frequency-domain received signal Y ' of (8a)1With Y '2Equilibrium is carried out, after obtaining 1 equilibrium of the first source node S Receive signal Y1With the reception signal Y after 2 equilibrium of the second source node S2:
Y1=Y '1W,
Y2=Y '2W,
Wherein,Indicate that zero forcing equalization matrix, H (l) indicate the equivalent letter of l diameter The frequency domain response of road coefficient h (l), 0≤l≤L-1；
(8c) the first source node S 1 and the second source node S 2 are respectively to the reception signal Y after respective equilibrium1And Y2It is inverse to carry out Fourier Transformation, obtains the signal to be demodulated of the first source node S 1With the signal to be demodulated of the second source node S 2
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