CN106413029B - A kind of more relay selection methods for decoding forwarding bidirectional relay system - Google Patents
A kind of more relay selection methods for decoding forwarding bidirectional relay system Download PDFInfo
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Abstract
The invention discloses a kind of more relay selection methods for decoding forwarding bidirectional relay system.This method comprises: source point 1 and source point 2 mutually pass data using several relay points, it will be properly received the bi-directional relaying composition candidate relay subset of data transmitted by two source points simultaneously；The channel capacity weighted value that source point 1 and source point 2 are respectively relayed into candidate relay subset is calculated separately, after channel capacity weighted value summation, carries out descending descending sort；It selects relaying corresponding to top n channel capacity weighted value to enter from the candidate relay subset after sequence to have chosen after subset；According to normalization thresholding, from the remaining relaying of candidate relay subset, continue to select to relay to enter to have chosen after subset；Finally, the source point data received are respectively sent to source point 1 and source point 2 by the relay point for having chosen stepchild to concentrate, the data completed between source point are mutually passed.The method have the characteristics that the diversity order of Turbo Detection for Cooperative Communication is effectively increased, the situation out-of-date especially suitable for channel state information in Practical Project.
Description
Technical field
The present invention relates to more relay selection methods of decoding forwarding bidirectional relay system.
Background technique
Communication for coordination technology is effective against the wireless fading channel of channel by space diversity.In in Turbo Detection for Cooperative Communication
After due to data forwarding mode difference, it is divided into amplification forwarding relaying (forwarding after amplifying to reception signal) and decoding forwards
Relaying (is re-encoded after being decoded to reception signal and is forwarded).
Each node usually transmits data in a manner of semiduplex in traditional Turbo Detection for Cooperative Communication, and this results in a data
Symbol is sent to destination node from source node and needs to occupy two channels.In order to improve the availability of frequency spectrum, bi-directional relaying collaboration is logical
Letter system is come into being.Since bidirectional relay system has apparent superiority compared with one-way junction system, receive increasingly
More concerns.
In order to reduce the complexity of bidirectional relay system, cooperative relaying selection technique is widely adopted.Cooperative relaying selection
Technology can be divided into single relay selection and more relay selections, basic thought be selected in numerous available relayings some or it is certain
Relay node participates in data forwarding and is effective against the wireless fading channel of channel using space diversity, can not only improve information transmission
Reliability, moreover it is possible to effectively improve the safety of transmission, current research is concentrated mainly on single relay selection.Due to single relaying choosing
Selecting technology only selects a most suitable relaying for data forwarding, therefore compared with more relay selection technologies, single relay selection
Computation complexity it is lower.However, the major defect of single relay selection method is not make full use of space diversity, especially exist
Under time varying channel, the diversity gain of system is only 1.And actual channel is nearly all time varying channel, due to its propagation delay time, in
Channel state information after the channel state information and relay forwarding data moment that select the moment is often inconsistent, i.e. channel status
It is out-of-date that information produces, at this time can extreme influence relay selection scheme performance.Therefore, in practical engineering applications, need pair
It is improved, to improve the diversity gain of system.
Summary of the invention
In view of the problems of above-mentioned prior art, the present invention is mentioned according to the characteristics of forwarding bidirectional relay system is decoded
For a kind of more relay selection methods for decoding forwarding bidirectional relay system, this method effectively increases Turbo Detection for Cooperative Communication
Diversity order, the situation out-of-date especially suitable for channel state information in Practical Project.
What the purpose of the present invention was achieved through the following technical solutions:
A kind of more relay selection methods for decoding forwarding bidirectional relay system characterized by comprising
A, source point 1 and source point 2 mutually pass data using several relay points, will be properly received 2 institute of source point 1 and source point simultaneously
The bi-directional relaying for sending data forms candidate relay subset, if the relaying number of the candidate relay subset is K, and assumes to need
The optimal relaying number first selected in this K relaying is N, meets K >=N；
B, the channel capacity of each relay point into candidate relay subset of source point 1 is calculated, and multiplied by weighting coefficient, obtains channel
Capacity weighted value I1k, k=1 ..., K；Similarly, the channel capacity weighting of each relay point into candidate relay subset of source point 2 is calculated
Value I2k；
C, channel capacity weighted value sums to obtain Ik=I1k+I2k, and by IkCarry out descending descending sort；
D, according to the channel capacity weighted value after sequence, top n I is selected from candidate relay subsetkIt is corresponding it is N number of in
It has chosen after an entrance after subset；
E, according to the n-th channel capacity weighted value I after sequenceN, multiplied by parameter μ ∈ [0,1], obtain normalization thresholding I(N)=μ IN.According to normalization thresholding, in remaining (K-N) a relaying of the candidate relay subset, continues selection relaying and enter
It has chosen after subset；
F, the source point data received are respectively sent to source point 1 and source point 2 by the relay point for having chosen stepchild to concentrate, and are completed
Data between source point mutually pass.
The step A further comprises:
A1, source point 1 and source point 2 click through row data using several bi-directional relayings and mutually pass；
A2, the bi-directional relaying that can be properly received data transmitted by source point 1 and source point 2 simultaneously form candidate relay subset,
If the relaying number of the candidate relay subset is K, and assumes that needing the optimal relaying number first selected in this K relaying is N,
Meet K >=N.
The step B further comprises:
B1, the channel capacity weighted value that source point 1 is respectively relayed into candidate relay subset is calculated, its calculation formula is I1k=|
h2k|2log2(1+SNR|h1k|2), wherein | h1k|2With | h2k|2It is each into candidate relay subset to respectively indicate source point 1 and source point 2
The channel coefficients of relay point, SNR indicate the average signal-to-noise ratio of channel；
B2, the channel capacity weighted value that source point 2 is respectively relayed into candidate relay subset is calculated, its calculation formula is I2k=|
h1k|2log2(1+SNR|h2k|2)。
The step E further comprises:
N-th channel capacity weighted value I after E1, sequenceN, multiplied by parameter μ ∈ [0,1], obtain normalization thresholding I(N)=
μIN；
In E2, candidate relay subset the channel capacity weighted value of remaining (K-N) a relaying successively with I(N)Compare, if greatly
In or be equal to I (N), then relaying corresponding to the channel capacity weighted value enters and has chosen after subset；If be less than I (N), then in this
It has chosen after not can enter after subset.
Detailed description of the invention
Fig. 1 is the schematic diagram of the method for the invention
Fig. 2 is the basic flow chart of the method for the invention
Specific embodiment
The present invention provides a kind of more relay selection methods for decoding forwarding bidirectional relay system.
Basic ideas of the invention are: source point 1 and source point 2 mutually pass data using several relay points, will be correct simultaneously
Receive the bi-directional relaying composition candidate relay subset of data transmitted by two source points；Source point 1 and source point 2 are calculated separately into candidate
Stepchild concentrates the channel capacity weighted value of each relaying, after channel capacity weighted value summation, carries out descending descending
Sequence；From the candidate relay subset after sequence select top n channel capacity weighted value corresponding to relaying enter chosen after
Subset；According to normalization thresholding, from the remaining relaying of candidate relay subset, continue to select to relay to enter to have chosen after subset；
Finally, the source point data received are respectively sent to source point 1 and source point 2 by the relay point for having chosen stepchild to concentrate, source point is completed
Between data mutually pass.This method effectively increases the diversity order of Turbo Detection for Cooperative Communication, especially suitable for channel in Practical Project
The out-of-date situation of status information.
Basic principle of the invention is as follows:
Assuming that including source point 1, source point 2 and M relay node in bidirectional relay system, it is denoted as Rm, m=0,1 ..., M-1.
Assuming that needing mutually to send data between source point 1 and source point 2, and multiple relay nodes are selected from M relay node, for counting
According to forwarding due to actual channel shadow fading it is serious, therefore assume between source point 1 and source point 2 without direct transmission link.
Data exchange between source point 1 and source point 2 needs two time slots.First time slot, source point 1 and source point 2 are sent out respectively
The number of delivering letters x1And x2To M relay node, then any relay point RmThe signal received can indicate are as follows:Wherein, P1And P2Respectively indicate the data transmission power of source point 1 and source point 2；h1mIt indicates
Source point 1 and RmBetween channel, h2mIndicate source point 2 and RmBetween channel；wmIndicate that mean value is zero, variance N0Additivity it is multiple
White Gaussian noise.Assuming that channel meets reciprocity, and source point 1 and source point 2 eliminate self-interference, then in second time slot,
Source point 1 and source point 2 receive the signal of relay forwarding.
The basic flow chart of more relay selection methods of the present invention is as shown in Fig. 2, include the following steps:
Step 20: source point 1 and source point 2 mutually pass data using several relay points, will be properly received source point 1 and source simultaneously
The bi-directional relaying of data transmitted by point 2 forms candidate relay subset, executes step 21；
Step 21: setting the relaying number of candidate relay subset as K, execute step 22；
Step 22: calculating the channel capacity weighted value that source point 1 is respectively relayed into candidate relay subset, its calculation formula is I1k
=| h2k|2log2(1+SNR|h1k|2), wherein | h1k|2With | h2k|2Source point 1 and source point 2 are respectively indicated into candidate relay subset
The channel coefficients of each relay point, k=1 ..., K, SNR indicate the average signal-to-noise ratio of channel, execute step 23；
Step 23: calculating the channel capacity weighted value that source point 2 is respectively relayed into candidate relay subset, its calculation formula is I2k
=| h1k|2log2(1+SNR|h2k|2), execute step 24；
Step 24: channel capacity weighted value sums to obtain Ik=I1k+I2k, and by IkDescending descending sort is carried out,
Execute step 25；
Step 25: according to the channel capacity weighted value after sequence, top n I is selected from candidate relay subsetkCorresponding
N number of relaying, which enters, have been chosen after subset, and step 26 is executed；
Step 26: the n-th channel capacity weighted value after sequence obtains normalization thresholding I multiplied by parameter μ ∈ [0,1](N),
Execute step 27；
Step 27: the channel capacity weighted value of (K-N) a relaying remaining in candidate relay subset successively with I(N)Compare,
If more than or be equal to I (N), then relaying corresponding to the channel capacity weighted value enters and has chosen after subset；If be less than I (N), then
It not can enter and chosen after subset；Execute step 28；
Step 28: the source point data received are respectively sent to source point 1 and source point by the relay point for having chosen stepchild to concentrate
2, the data completed between source point mutually pass.
Claims (1)
1. a kind of more relay selection methods of the bidirectional relay system for decoding forwarding, first select N number of optimal relaying, further according to
Normalization thresholding continues selection relaying, has been chosen with generating after subset characterized by comprising
A, source point 1 and source point 2 mutually pass data using several relay points, will be properly received simultaneously transmitted by source point 1 and source point 2
The bi-directional relaying of data forms candidate relay subset, if the relaying number of the candidate relay subset is K, and assumes to need in this K
The optimal relaying number first selected in a relaying is N, meets K >=N；
B, the channel capacity log of each relay point into candidate relay subset of source point 1 is calculated2(1+SNR|h1k|2), and multiplied by channel system
Number | h2k|2, obtain channel capacity weighted value I1k=| h2k|2log2(1+SNR|h1k|2), wherein k=1 ..., K, | h1k|2With |
h2k|2The channel coefficients of source point 1 and source point 2 each relay point into candidate relay subset are respectively indicated, SNR indicates being averaged for channel
Signal-to-noise ratio；Similarly, the channel capacity weighted value I of each relay point into candidate relay subset of source point 2 is calculated2k=| h1k|2log2(1+
SNR|h2k|2)；
C, channel capacity weighted value sums to obtain Ik=I1k+I2k, and by IkCarry out descending descending sort；
D, according to the channel capacity weighted value after sequence, top n I is selected from candidate relay subsetkCorresponding N number of relay point
Into having chosen after subset；
E, by the n-th channel capacity weighted value I after sequenceN, multiplied by parameter μ ∈ [0,1], obtain normalization thresholding I(N)=μ IN,
By the channel capacity weighted value of (K-N) remaining in candidate relay subset a relaying successively with I(N)Compare, if more than or equal to I(N), then relaying corresponding to the channel capacity weighted value enters and has chosen after subset；If being less than I(N), then the relaying not can enter
It has chosen after subset；
F, the source point data received are respectively sent to source point 1 and source point 2 by the relay point for having chosen stepchild to concentrate, and complete source point
Between data mutually pass.
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| CN105007105A (en) * | 2015-05-26 | 2015-10-28 | 广西师范大学 | Method for antenna selection and relay selection based on node classification |
| CN105282815A (en) * | 2015-09-23 | 2016-01-27 | 广西师范大学 | Multiple relay selection method in DF cooperative network |
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