p次方检测器协作频谱感知系统性能优化

Optimization of cooperation spectrum sensing system performance using p-th detector

为了提高认知无线电频谱感知系统可靠性,在考虑无线瑞利感知信道和有一定错误率的报告信道条件下,提出采用p次方检测器的协作频谱感知方案.通过考虑单天线上的采样信号数和OR融合准则,联合优化p次方检测器的指数p和最佳感知门限λ以使总错误概率最小.理论分析与仿真结果表明,在满足总错误率最小条件下,最佳指数p和感知门限λ同时存在.并且有当采样信号数越大时,指数p越来越大且有上界,最佳感知门限λ越来越小且有下界.

In order to improve the reliability of cognitive radio spectrum sensing system, we propose the coop- erative spectrum sensing method with p - th power detector. It is proposed in condition of using Rayleigh sensing channel and the reported channel with a fixed error rate. Considering the sampling signals on a single antenna and OR fusion rule, we joint optimize the p - th power of p - th power detector and best sensing threshold A to make the total error rate minimum. Theoretical analysis and simulation results show that there is the best p and sensing threshold A to satisfy the minimum total error rate. Meanwhile, when the number of sampling signal is larger and larger,p -th power is larger and larger and a upper bound, and sensing threshold A is smaller and smaller and a lower bound.