认知无线电中的协作频谱感知技术

The technology of cooperative spectrum sensing in cognitive radio

频谱资源匮乏是目前通信领域遇到的一个难题,缓解频谱资源短缺的一个有效方法是频谱感知技术,它可以实现频谱的动态利用,提高频谱的利用率。首先介绍了能量检测法、匹配滤波检测法以及循环平稳特性检测法3种单用户谱感知技术,然后研究了协作频谱感知技术的系统结构和感知模型,最后基于能量检测法的协作频谱感知中的“K-N”融合准则进行仿真,结果表明,当K=|N+1/2|时,协作频谱感知的性能达到最优。

The lack of spectrum resources is a difficult problem in the communication field.An effective method to alleviate the shortage of spectrum resources is spectrum sensing technology,which can realize the dynamic utilization of spectrum and improve the utilization of spectrum.Firstly,this paper introduces three single-user spectrum sensing techniques:energy detection method,matched filter detection method and cyclostationary characteristic detection method.Then,the system structure and perception model of cooperative spectrum sensing technology are studied.Finally,the cooperative spectrum sensing of the"K-N"fusion criterion based on energy detection method is simulated,the simulation results show that cooperative spetrum sensing performance is optimal when K=|N+1/2|.