为了在认知无线电网络中有效地感知出授权用户,通过在无线通信网络中对多分支协作分集方式的研究,提出了在3个认知用户组成的认知无线电网络中,2个认知用户作为1个认知用户的中继用户,采用多分支协作分集方式感知授权用户。对其检测性能进行了理论分析,表明该方法是一种有效的感知方法,并且在低信噪比环境下,也可以有效地提高检测概率和降低检测时间从而提高网络的敏捷度增益。实验仿真结果证明,在低信噪比的环境下,该方法也可以获得较好的性能。

In order to sense effectively primary user in cognitive radio networks,the multi-branch cooperative diversity in wireless communication networks is studied.A cooperative network composed of three cognitive users,two cognitive users acting as relay users for one cognitive user,using multi-branch cooperative diversity protocol to detect primary user in cognitive radio networks is proposed.The performance of this spectrum sensing method is analyzed.Theoretical analysis results show that this cooperative method can effectively sense primary user,and the method can also improve the detection probability,reduce the detection time,improve the network agility gain and help to improve the detection performance under low signal-to-noise ratio(SNR).Simulation results support the analysis conclusions.

TN929.5

国家自然科学基金资助项目