New Optimal Power Allocation for Bidirectional Communications in Cognitive Relay Network Using Analog Network Coding  

作　　者：LU Luxi JIANG Wei XIANG Haige LUO Wu 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems ＆ Networks School of EECS, Peking University, Beijing, 100871, China

出　　处：《China Communications》2010年第4期144-148,共5页中国通信（英文版）

基　　金：Acknowledgements The work was supported by National Natural Science Foundation of China （Grant No.60972008）. The corresponding author is Jiang Wei.

摘　　要：Cognitive radio and cooperative communication can greatly improve the spectrum efficiency in wireless communications.We study a cognitive radio network where two secondary source terminals exchange their information with the assistance of a relay node under interference power constraints.In order to enhance the transmit rate and maintain fairness between two source terminals,a practical 2-phase analog network coding protocol is adopted and its optimal power allocation algorithm is proposed.Numerical results verify the superiority of the proposed algorithm over the conventional direct transmission protocol and 4-phase amplify-and-forward relay protocol.Cognitive radio and cooperative communication can greatly improve the spectrum efficiency in wireless communications. We study a cognitive radio network where two secondary source terminals exchange their information with the assistance of a relay node under interference power constraints. In order to enhance the transmit rate and maintain fairness between two source terminals, a practical 2-phase analog network coding protocol is adopted and its optimal power allocation algorithm is proposed. Numerical results verify the superiority of the proposed algorithm over the conventional direct transmission protocol and 4-phase amplify-and-forward relay protocol.

关 键 词：Cognitive Radio Cooperative Communication Analog Network Coding Bidirectional Communications Interference power constraint 

分 类 号：TN92[电子电信—通信与信息系统] TP393[电子电信—信息与通信工程]