优化的最佳中继协作频谱感知

The Optimal Cooperative Spectrum Sensing with Best Relay

在基于中继的协作频谱感知中,通过引入认知中继可有效提高协作频谱感知性能。为了节约系统开销,本文在前期取得研究成果的基础上,提出了一种基于删余的最佳中继协作频谱感知方案,只有当次用户检测到主用户信号且目标次用户的报告信道衰落严重时,才申请认知中继的协作传输;分别从检测性能和次系统可获得的容量角度对所提方案下的协作频谱感知性能进行了分析。分析和仿真结果表明,所提方案可以有效提高检测性能,当确保主用户受到足够保护时,利用所提方案可以获得更高的次系统容量。

In the relay-based cooperative spectrum sensing, the cooperative spectrum sensing performance can be effectively improved by introducing relay＇ s cooperation. In order to save the system cost, we propose a censoring based cooperative spectrum sensing with best relay on the basis of the prior work. Only when the secondary user has detected the primary us- er＇ s signal and its reporting channel is destructively faded, it will apply for the cognitive relay＇ s cooperation. We analyzed the cooperative spectrum sensing performance from the point of detection performance and the achievable secondary through- put. Both the theoretical analysis and simulation results show that the improved detection performance can be obtained by the proposed scheme, and when assuring sufficient protection to the primary user, the achievable secondary throughput can also be improved by the proposed scheme.