计算机技术与发展2011，Vol.21Issue(5)：13-16,21,5.
不同衰落信道下的协作感知性能研究
Performance of Cooperative Spectrum Sensing over Different Fading Channels
摘要
Abstract
In cognitive radio network, cooperative spectrum sensing is regarded as an effective scheme to mitigate the degradation of sensing performance, which is brought about by some factors, such as channel fading, shadowing,etc. In this paper,analyze the performance of local spectrum sensing over differenr fading channels in detail, and investigate the performance of cooperative spectrum sensing based on the energy detection and K out of N decision fusion with different numbers of cooperative users. Furtbermore,discuss the effect on the sensing performance due to the spatially correlated shadowing. Finally, from the numerical analysis and simulation results,can get a conclusion that the degradation of local performance is more serious over fading channels than that over AWGN channel, in particular,Suzuki channel provides the worst-case scenario under all the listed channels, and the OR rule is usually the best choice for cooperative sensing performance, which is improved with the number of users increasing. In order to mitigate the unfavorable effect of correlated shadowing, the node distance should be increased. In addition, a fewer number of users but more decentralized cooperation maybe has a beret sensing performance than that in a dense sensing network in a fixed small area.关键词
认知无线电/频谱感知/协作感知/阴影相关性Key words
cognitive radio/ spectrum sensing/ cooperative sensing/ correlated shadowing分类
信息技术与安全科学引用本文复制引用
郭云玮,刘全,高俊..不同衰落信道下的协作感知性能研究[J].计算机技术与发展,2011,21(5):13-16,21,5.基金项目
国家863计划资助项目(2009AAJ208,2009AAJ116) （2009AAJ208,2009AAJ116）
