优化的最佳中继协作频谱感知

在基于中继的协作频谱感知中，尽管通过引入认知中继可有效提高协作频谱感知性能，然而认知中继的引入也会带来额外的系统开销及复杂度增加问题。为了节约系统开销，本文在前期取得研究成果的基础上，进一步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，同时目标次用户将其检测到的感知信息发送到认知中继；最后，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理论分析。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的前提下，利用所提方案可以获得更高的次系统容量。 

The optimal cooperative spectrum sensing with best relay

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 user’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 throughput. 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.