摘要
为获得最佳感知,系统在n个备选用户中选择最佳中继进行协作感知。但实际系统可能由于各种原因选择了第二佳或乃至更为一般的第N佳中继。为此,提出基于第N佳中继选择的协作频谱感知,推导了其在瑞利平坦衰落下的检测概率,并给出闭合表达式。数值计算表明,随着N的增加,系统检测概率不断下降,乃至低于任意选择;随着n的增加,基于最佳或接近最佳选择的系统检测概率明显提高,而基于最差或接近最差选择的系统检测概率则有所下降。
In the cognitive radio system,the optimal relay would be selected from the n available ones to obtain the best sensing performance.However,in actual systems,the secondary or even the more general Nth best relay may be selected for various reasons.Therefore,the cooperative spectrum sensing based on the Nth best relay selection was proposed.The closed-form expression of the detection probability was derived in Rayleigh fading channels.Numerical results show that the detection probability declines continuously even below the one of the arbitrary selection as N increases,and that the one based on the optimal or suboptimal selection increases obviously but the one based on the worst or near worst selec-tion decreases slightly as n increases.
出处
《通信学报》
EI
CSCD
北大核心
2011年第11期176-182,共7页
Journal on Communications
基金
国家自然科学基金资助项目(60872002
61071086)
南通市应用研究计划基金资助项目(BK2011064)
江苏省高校自然科学基金资助项目(11KJB510021
11KJB510020)~~
关键词
认知无线电
协作频谱感知
多用户分集
检测概率
cognitive radio
cooperative spectrum sensing
multiuser diversity
detection probability