A relay selection scheme based on geometric optimum in cooperative cognitive systems over mixed channels  

作　　者：李静叶 Luo Tao Shao Yubin Yue Guangxin 

机构地区：[1]Beijing Key Laboratory of Network System Architecture and Convergence,Beijing University of Posts and Telecommunications [2]School of Information Engineering and Automation,Kunming University of Science and Technology

出　　处：《High Technology Letters》2013年第3期321-326,共6页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.61271184);New Century Excellent Talents in University(NCET-110594);Fundamental Research Funds for the Central Universities(No.2013RC1001)

摘　　要：This paper proposes a relay selection scheme based on geometric optimum principle to maximize the cognitive link＇ s connectivity with limited interference to primary user in cooperative cognitive systems. A dual-hop cognitive relay system is considered, in which the channel impulse response follows independent non-identical distribution （i. n. d. ） each hop, such as Rician, Rayleigh and Nakagami-m distribution. Then, closed-form expressions in terms of outage probability and average bit error rate （ABER） are obtained using amplify-and-forward （AF） relaying protocol over such mixed fading channels. Furthermore, the best range of the relay is derived. Extensive simulation re- suits are conducted to verify the theoretical analysis, which is useful to the network optimal design.This paper proposes a relay selection scheme based on geometric optimum principle to maximize the cognitive link's connectivity with limited interference to primary user in cooperative cognitive systems.A dual-hop cognitive relay system is considered,in which the channel impulse response follows independent non-identical distribution(i.n.d.)each hop,such as Rician,Rayleigh and Nakagami-m distribution.Then,closed-form expressions in terms of outage probability and average bit error rate(ABER)are obtained using amplify-and-forward(AF)relaying protocol over such mixed fading channels.Furthermore,the best range of the relay is derived.Extensive simulation results are conducted to verify the theoretical analysis,which is useful to the network optimal design.

关 键 词：cognitive radio （CR） RELAY outage probability average bit error rate （ABER） mixed channels 

分 类 号：TN925[电子电信—通信与信息系统]