Fundamental capacity for peak interference power constrained cognitive radio relay networks  

作　　者：谢先斌 Guo Wei Li Xinshan 

机构地区：[1]National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,P.R.China

出　　处：《High Technology Letters》2012年第2期173-178,共6页高技术通讯（英文版）

摘　　要：A Cognitive radio communication link is possible to be interrupted easily when its physical channel suffers severe fading. Relay technology is an effective way to mitigate the fading effect of wireless channels in a network. Based on the highest achievable rate of the relay channels, this paper considers a cognitive radio relay network where the secondary transmitter communicates with the receiver through the best relay node under the peak power constraint of a primary receiver. Intuitively, the secondary transmission can benefit from an intermediate relay node chosen from N possible nodes. To quantify this benefit, outage probability of cognitive radio relay networks is derived and also the closed-form expressions for outage capacity and ergodic capacity of cognitive radio relay networks are obtained in Rayleigh fading channels. Numerical simulation results are provided to show that the outage capacity and ergodic capacity benefit tremendously by properly increasing the number of relaying nodes.

关 键 词：cognitive radio relay networks （CRRN） outage probability outage capacity ergodic capacity peak interference power constrained 

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]