基于STFT-WVD联合的认知无线电频谱感知分析与仿真  

Spectrum Sensing Analysis and Simulation Based on STFT-WVD for Cognitive Radio

作　　者：张纳温[1] 李树彬[1] 李松[1] 张春梅[1] 

机构地区：[1]空军工程大学防空反导学院,陕西西安710051

出　　处：《无线电工程》2016年第5期22-24,98,共4页Radio Engineering

基　　金：航空科学基金资助项目(20120196003)

摘　　要：频谱感知是认知无线电中的一项关键技术,其性能取决于感知节点的本地频谱检测结果的可靠性,在已有的方案中很少考虑。对频谱感知方法进行了讨论,指出了其使用的局限性,提出了采用STFT-WVD联合的频谱感知方法,该方法克服了STFT分辨率低和WVD存在交叉项的问题,得到了时间、频率聚集性很好的时频域分布图。数值分析与仿真结果证明该方案的可行性与可靠性,完全可以完成频谱感知的任务,为频谱决策提供有力的理论依据。Spectrum sensing plays an important role in cognitive radios, its performance depends on the reliability of the local spectrum sensing results from secondary nodes ,which is rarely considered in existing scheme.The conventional spectrum sensing method is discussed and its limitations are pointed out.And then method of using the STFT-WV joint time-frequency analysis to sense spectrum is proposed,this method overcomes not only the lower resolution ratio of STFT but also the WVD cross items, and a better time-frequen- cy clustering is obtained at the same time. The simulation results show this method accomplishes the task of spectrum sensing effectively,which provides the theoretical basis for spectrum decision.

关 键 词：认知无线电 频谱感知 时频域分析 WIGNER-VILLE分布 

分 类 号：TN929.5[电子电信—通信与信息系统]