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Relay selection method based on threshold and maximum safe capacity

A security capacity and threshold technology, which is applied in the field of wireless communication, can solve the problems of no guarantee of communication security transmission, high signal-to-noise ratio received by eavesdroppers, etc., to achieve both channel security and reliability, ensure security, and ensure reliability Effect

Active Publication Date: 2015-12-09
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relay node that maximizes the receiving SNR of the destination node D may also maximize the receiving SNR of the eavesdropper, so that the transmission signal is intercepted by the eavesdropper E
This method also does not guarantee the secure transmission of communication

Method used

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  • Relay selection method based on threshold and maximum safe capacity
  • Relay selection method based on threshold and maximum safe capacity
  • Relay selection method based on threshold and maximum safe capacity

Examples

Experimental program
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Embodiment 1

[0024] Such as figure 1 It is shown that the first specific implementation of the present invention is a relay transmission method based on threshold and maximum safety capacity criterion, and its steps are as follows:

[0025] A. A source node (S), multiple relay nodes (R k ) and a destination node (D) constitute a two-hop cooperative relay network, the number of relay nodes is K, in addition, there is an eavesdropper (E) to intercept the signal of relay network communication, and all nodes are equipped with a root antenna.

[0026] B. In the first time slot of communication, the source node (S) sends all relay nodes (R k ) to send a useful signal x, at this time, any relay node (R k ) received signal is y SRk ;

[0027] Specifically, in the first time slot of communication, the source node (S) sends all relay nodes (R k ) sends a useful signal x, then any relay node (R k ) received signal is in for the relay (R k Noise at ), h 1k is the first hop link (S→R k ) ...

Embodiment 2

[0035] The method in this example is basically the same as that in Example 1, the difference is only:

[0036] The magnification of the relay node in the two steps of C and E is

[0037] The method in this example is applicable to a multi-relay network with variable gain (change in amplification factor).

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Abstract

The invention relates to a relay selection method based on a threshold and maximum safe capacity criterion. According to the relay selection method, a signal source node S transmits signals to relay nodes, and the signals are forwarded to a target node D; then a set of relay nodes corresponding to the target node D with received signal-to-noise ratios which are more than a fixed signal-to-noise ratio threshold value when the signals are transmitted through a main link (S to Rk to D) is selected; an eavesdropper E also can receive the signals which are amplified and forwarded by the relay nodes; the corresponding received signal-to-noise ratio of the eavesdropper E is obtained in the candidate relay node set; the safe capacity of a whole communication system is obtained by using the received signal-to-noise ratios of the target node D and the eavesdropper E; and the relay with the maximum safe capacity is selected from the candidate relay node set. The relay selection method overcomes respective defects of two previous methods. According to the relay selection method, the communication reliability of the main link and the safety of the whole communication system are ensured, the optimum performance of the multi-relay system is played, and both the safety and reliability of the channel are covered.

Description

technical field [0001] The invention relates to a cooperative relay system with eavesdroppers, belonging to the technical field of wireless communication, in particular to a relay selection method based on a threshold and maximizing security capacity. Background technique [0002] In recent years, with the rapid development of global mobile wireless communication technology, people will have higher and higher requirements for wireless communication transmission performance indicators. However, due to the fading caused by the multipath transmission of wireless signals, the Doppler frequency shift caused by the fast movement of the mobile station, and the interference between multiple users caused by simultaneous communication of multiple users, the future broadband wireless communication system is limited. Effective improvement of transmission rate and reliability. The emergence of cooperative relay technology can improve the transmission performance of wireless communicatio...

Claims

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Application Information

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IPC IPC(8): H04W40/22
CPCH04W40/22Y02D30/70
Inventor 杨睛陈蕾鲍实胡学龙颜彪
Owner YANGZHOU UNIV
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