Adjustable multi-relay selection method and system for cooperative communication network
A cooperative communication and network technology, applied in the direction of diversity/multi-antenna system, baseband system components, transmitter/receiver shaping network, etc., can solve the problem of small performance gain of system bit error rate, increased energy consumption, and reduced system Spectrum efficiency and other issues
Active Publication Date: 2018-12-25
HARBIN INST OF TECH AT WEIHAI
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However, the existing research on multi-relay selection schemes assumes that the channel state information between all nodes is known at the receiving end
In addition, although the multi-relay selection scheme can obtain considerable performance gains, when the number of cooperative nodes exceeds a certain value, the performance gain of the bit error rate of the system is very small, and it is possible to select more nodes than required
Moreover, studies have shown that increasing the number of relay nodes will reduce the spectral efficiency of the system and increase energy consumption
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[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0048] as attached figure 1 As shown, the present invention proposes an adjustable multi-relay selection method used in a cooperative communication network, with figure 1 It is a simple system model of the present invention, the multi-relay cooperative network system includes a source node S, a destination node D, and multiple relay nodes R between the source node S and the destination node D i , where source node S, destination node D and relay node R i (i=1, 2, ... N R ) contain only one transmitting antenna and one receiving antenna, which are in half-duplex mode and cannot receive and transmit signals at the same time. Suppose the relay works in the amplification and forwarding (AF) mode and all the relays have the same average power limit. Then each transmission process of sending information from the source node S to the destination node D in...
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The present invention relates to the technical field of wireless communication, in particular to an adjustable multi-relay selection method and system used in a cooperative communication network, which is characterized in that the source node sends a data packet to all relay nodes, and the relay node The received signal is amplified and forwarded to the destination node in a time-sharing manner, and the equalization detector processes the received signal to obtain the corresponding output signal-to-noise ratio SNRSRiD, and the relay sorting can be completed according to the SNRSRiD size comparison, and then according to the sorting result, the cooperative node Compared with the prior art, the present invention achieves a better compromise between spectral efficiency, bit error rate performance and energy consumption, and can adaptively adjust the number of cooperative nodes according to the comparison of the combined signal-to-noise ratio under different cooperative node numbers , and finally obtain the optimal number of cooperating nodes No (optimum means using the smallest number of coordinating nodes No to obtain the maximum combined signal-to-noise ratio).
Description
technical field [0001] The present invention relates to the field of wireless communication technology, in particular to a cooperative communication network that can adaptively adjust the number of relay nodes participating in cooperation and obtain low energy consumption and high performance, and is especially suitable for use in a cooperative communication network using an orthogonal relay channel. An adjustable multi-relay selection method and system in a cooperative communication network. Background technique [0002] Since cooperative communication has the advantages of eliminating the influence of wireless channel fading and gaining space diversity gain, it has attracted extensive attention from academic and industrial circles. At present, a large number of cooperation schemes have been proposed, and the performance analysis of these schemes has been made. Through the analysis and comparison of these schemes, the relay selection scheme has attracted considerable atten...
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IPC IPC(8): H04B7/04H04L25/03
CPCY02D30/70
Inventor 刘志勇张钦宇曹斌
Owner HARBIN INST OF TECH AT WEIHAI