认知无线电衰落信道的两步协作频谱感知方案

Two Step Cooperative Spectrum Sensing Scheme over Fading Channels for Cognitive Radio

针对单天线单用户频谱感知性能严重恶化的问题.为了进一步提高频谱检测性能,减小感知数据传输开销,提出了两步协作频谱感知方案.仿真结果表明,提出的基于平方率合并的软合并两步协作频谱感知方案,克服了多径衰落、阴影衰落和接收机不稳定的问题,大大提高了频谱检测可靠性,具有软合并协作和硬合并协作的优点,减小了网络负载,同时提高了检测性能.

In the cognitive radio network,the performance of spectrum sensing by a single user with a single antenna may degrade significantly.In order to improve the detection performance and reduce spectrum sensing data transmission overhead,a two step cooperative spectrum sensing scheme was proposed.Simulations show that proposed scheme can significantly improve the detection reliability by overcoming multi-path fading,shadowing and the receiver uncertainty problem.The proposed scheme combines the advantages of the soft combination and the hard combination schemes.In addition,it will reduce the network overload and improves the detection performance.