衰落信道下基于簇的协作频谱感知分析

摘要

In distributed cooperative sensing network, the channels over which cognitive users send local decision to the fusion centre are fading channels under bandwidth constraints in actual communication environment. In this paper, and-rule fusion cooperative spectrum sensing under fading channels is analyzed at first ,then cluster-based cooperative spectrum sensing method when the channels between each cognitive user are Nakagami channels is proposed. The expressions for detection probability and the normalized average number of sensing bits of the above two schemes are derived. Simulation results show that cluster-based cooperative spectrum sensing algorithm has preferable sensing performance by expending more sensing bits.%在分布式协作频谱感知网络中,认知用户向融合中心上报本地检测的信道是带宽受限的,并且受各种衰落的影响。分析了衰落信道下认知用户通过＂与＂规则进行融合的协作感知策略,提出了认知用户间为Nakagami信道时基于簇理论的协作感知方案,推导得出了2种方法的检测概率和归一化平均感知比特数。仿真结果表明,基于簇理论的协作感知通过牺牲一定的信令开销得到较好的感知性能。