Joint power control and relay selection scheme for cognitive two-way relay networks

被引:0
|
作者
Dingcheng Yang [1 ]
Lin Xiao [1 ]
Jisheng Xu [2 ]
Wengang Li [3 ]
机构
[1] Information Engineering School, Nanchang University
[2] School of Electronics and Information, Wuhan University
[3] National Key Lab of ISN, Xidian University
基金
中国国家自然科学基金;
关键词
cognitive radio; two-way relay; power control; relay selection;
D O I
暂无
中图分类号
TN925 [无线电中继通信、微波通信];
学科分类号
080402 ; 080904 ; 0810 ; 081001 ;
摘要
A joint power control and relay selection scheme is considered for a cooperative and cognitive radio system where a secondary network shares spectrum with the primary network. In the secondary network, two secondary users (SUs) communicate with each other via an assist relay. The main point is to provide the best system performance to SUs while maintaining the interference power at primary user (PU) under a certain level. Using convex optimization, a closed-form solution is obtained when optimizing the power allocation among the two nodes and relay. Based on this result, a joint power control and relay selection scheme with fewer variable dimensions is proposed to maximize the achievable rate of the secondary system. Simulation results demonstrate that the sum rate of the cognitive two-way relay network increases compared with a random relay selection and fixed power allocation.
引用
收藏
页码:571 / 578
页数:8
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