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Confidential transmission method for dual-cognitive relay communication system

A technology of cognitive relay and transmission method, applied in the field of wireless cognitive relay communication, which can solve problems affecting the stable transmission of system data and heavy system burden, so as to reduce the complexity of implementation, improve confidentiality, and facilitate stable transmission Effect

Inactive Publication Date: 2015-08-19
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the opportunistic branch selection technology needs to estimate the channel parameters of the two branches in each transmission frame, which brings a heavy burden to the system.
In addition, opportunistic branch selection frequently switches between two branches, seriously affecting the stable transmission of system data

Method used

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  • Confidential transmission method for dual-cognitive relay communication system
  • Confidential transmission method for dual-cognitive relay communication system
  • Confidential transmission method for dual-cognitive relay communication system

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this implementation records a secure transmission method for a dual-cognitive relay communication system, and the method includes the following steps:

[0033] S1: If the previous frame used cognitive relay R 1 link for data communication, go to step S2; if the previous frame uses cognitive relay R 2 The link then enters step S3;

[0034] S2: Estimate the current frame relay R 1 The channel parameters of the link, judge the relay R 1 Can the link provide secure communication, if so, relay R 1 If the link branch resides, go to step S4; otherwise, perform branch switching and estimate the current frame relay R 2 The channel parameter of the link, enter step S4;

[0035] S3: Estimate the current frame relay R 2 The channel parameters of the link, judge the relay R 2 Can the link provide secure communication, if so, relay R 2 If the link branch resides, go to step S4; otherwise, perform branch switching and estimate the current frame rela...

Embodiment 2

[0047] A confidential transmission method of a dual cognitive relay communication system described in this implementation uses a Monte Carlo computer to simulate the confidentiality interruption probability and branch resident probability of the method proposed in the present invention under the Matlab simulation environment. In the simulation experiment, the links between the system nodes obey the flat Rayleigh fading. The two-hop channel average gain of the main channel is modeled using the path attenuation model, where the attenuation coefficient is 4. Assume that the distance between the source node and the target node is 1, and two cognitive relays are between the source node and the target node. respectively with D 1 、D 2 Indicates source node to relay R 1 , R2 The distance between, correspondingly, with R 1 The average strength of the connected two-hop main channel is D 1 -4 , (1-D 1 ) -4 ; with R 2 The average strength of the connected two-hop main channel is ...

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Abstract

The invention relates to a confidential transmission method for a dual-cognitive relay communication system. The confidential transmission method includes the following steps that: S1, the method enters S2 if a last frame uses a relay R1 link to perform communication, and if the last frame uses a relay R2 link, the method enters S3; S2, the channel parameter of a relay R1 link of a current frame is estimated, and whether the relay R1 link can provide a confidential channel is judged, if the relay R1 link can provide a confidential channel, the relay R1 link stays, and the method enters S4, otherwise, the relay R1 link is switched, the channel parameter of a relay R2 link of the current frame is estimated, and the method enters S4; S3, the channel parameter of the relay R2 link of the current frame is estimated, and whether the relay R2 link can provide a confidential channel is judged, if the relay R2 link can provide a confidential channel, the relay R2 link stays, and the method enters S4, otherwise, the relay R2 link is switched, and the channel parameter of the relay R1 link of the current frame is estimated, and the method enters S4; and S4, a source node transmits confidential data to a target node through selected links until termination. With the confidential transmission method of the invention adopted, data can be transmitted reliably and secretively, and the complexity of the implementation of the system can be decreased.

Description

technical field [0001] The present invention relates to the technical field of wireless cognitive relay communication, in particular to a secret transmission method of a cognitive relay communication system based on branch handover and resident combination technology. Background technique [0002] In recent years, wireless communication technology is changing with each passing day, and wireless services have experienced explosive growth, which has brought a heavy burden to the spectrum resources of the system. In order to alleviate the depletion of radio spectrum resources, researchers have proposed cognitive communication technology, from which communication users can share the spectrum resources of primary users, thus making full use of the idle spectrum in actual communication scenarios and greatly improving the utilization of spectrum resources. usage efficiency. Integrating relay technology into the cognitive relay communication system formed by cognitive communication...

Claims

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Application Information

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IPC IPC(8): H04W12/02
CPCH04W12/02
Inventor 范立生周雯李旭涛陈银东
Owner SHANTOU UNIV
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