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

作　　者：Dingcheng Yang Lin Xiao Jisheng Xu Wengang Li 

机构地区：[1]Information Engineering School, Nanchang University [2]School of Electronics and Information, Wuhan University [3]National Key Lab of ISN, Xidian University

出　　处：《Journal of Systems Engineering and Electronics》2013年第4期571-578,共8页系统工程与电子技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (61250005);Jiangxi Postdoctoral Science Foundation(2013KY07)

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.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.

关 键 词：cognitive radio two-way relay power control relay selection. 

分 类 号：TN925[电子电信—通信与信息系统]