认知无线电中频谱检测技术研究

摘要

认知无线电系统可以通过检测周围的频谱环境，有效地利用空闲频谱。频谱检测是认知无线电的关键技术之一，通过搜寻频谱空洞，为高层决策提供辅助。针对认知无线电中的多窗谱估计和加权交叠分段平均法等频谱检测算法进行了简要介绍。对多窗谱估计算法的性能进行了仿真，分析了算法中重要参数对估计能力的影响。对频谱检测算法的硬件实现进行了验证，结果表明算法达到了比较理想的性能。%The cognitive radio system can effectively utilize the idle spectrum by detecting the surrounding spectrum environment. The spectrum detection,as one of the key technologies in cognitive radio system,can search spectrum holes and provide assistance for higher level decision.In this paper,the spectrum detection algorithms in cognitive radio system such as multi-taper method and weighted overlapped segment averaging method are introduced.The performance simulations of multi-taper method are carried out,and the impact of important parameters on estimation capability in this method is analyzed. Finally the hardware implementation of spectrum detection algorithms is verified,and the results show that the performance of algorithms is ideal.