﻿ 基于认知无线电通信系统的最优中继集合选择方案 A Best Relay Set Selection Scheme for Cooperative Transmission in Cognitive Radio Network

Hans Journal of Wireless Communications
Vol.05 No.01(2015), Article ID:14819,6 pages
10.12677/HJWC.2015.51004

A Best Relay Set Selection Scheme for Cooperative Transmission in Cognitive Radio Network

Shunlan Liu, Chunxia Wang, Jie Yu, Wei Fang

Department of Communication Engineering, Hangzhou Dianzi University, Hangzhou Zhejiang

Email: wcx1506@163.com

Received: Jan. 22nd, 2015; accepted: Feb. 6th, 2015; published: Feb. 10th, 2015

ABSTRACT

In this paper, a best relay set selection scheme based on Decode and Forward and received SNR maximization is proposed for cooperative communication in Cognitive Radio system, and the closed-form expression of outage probability based on the proposed scheme is derived. Furthermore, the proposed scheme is compared with traditional direct communication scheme and the random relay selection scheme in terms of outage probability through numerical experimentation. Numerical results illustrate that the proposed scheme can greatly decrease outage probability.

Keywords:Cognitive Radio, Cooperative Communication, Relay Set Selection, Decode and Forward, Outage Probability

Email: wcx1506@163.com

1. 引言

2. 系统模型

Figure 1. Cooperative model based on CR system

(1)

(2)

1) 当时，若假设在中我们选择最优中继集合来转发信号，则SD接收信号为

(3)

(4)

PD在第一阶段的接收信号为

(5)

(6)

(7)

(8)

(9)

(10)

2) 当时，ST重复发射在第一阶段发射的信号，即SD在第二阶段接收到的信号为

(11)

(12)

3. 基于CR通信系统的最优中继集合选择方案

(13)

(14)

(15)

(16)

(17)

(18)

(19)

(20)

(21)

(22)

(23)

(24)

4. 仿真分析

Figure 2. The comparison of outage probability under different threshold

Figure 3. The comparison of outage probability under different rate R

5. 总结

A Best Relay Set Selection Scheme for Cooperative Transmission in Cognitive Radio Network. 无线通信,01,21-27. doi: 10.12677/HJWC.2015.51004

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