中文摘要：

文中提出了一种认知无线电协作频谱感知改进方法。该方法将基于DS证据理论的融合技术与双门限判决方法的优点结合起来。首先,在本地感知时,根据双门限判决去除可靠性不高的感知用户,让可靠性较高的感知用户向融合中心发送信任度函数值,减少了向融合中心发送的数据,从而降低了系统的协作带宽开销。在融合中心,利用DS融合准则,只对接收到的可靠性较高的数据进行融合判决,从而降低融合中心的计算量。仿真结果表明,该改进方法在降低系统的计算量的同时,既可以保持经典DS证据融合方法的高检测性能,也可以有效地降低协作感知的报告信道带宽。

英文摘要：

An improved cooperative spectrum sensing scheme in cognitive radio networks is proposed,which combines the fusion technology based on Dempster- Shafer evidence theory with the advantage of double threshold decision. In the local sensing period,double threshold decision is introduced to remove the cognitive users with lowreliability and let the cognitive users with high reliability send the trusted function value,decreasing the data sending to the fusion center,so as to reduce report channel bandwidth of cooperation. In the fusion period,just the highly credible sensing results are fused at the fusion center using the Dempster- Shafer theory,which could reduce the calculation of fusion center. The simulation results showthat the novel scheme can keep high detection performance and reduce bandwidth of cooperation with a lowcalculation of cooperative system.