基于调制宽带转换器的自适应频谱感知研究  

Research on adaptive spectrum sensing based on modulated broadband converter

作　　者：廖小斌 余江[1] LIAO Xiaobin;YU Jiang(School of Information,Yunnan University,Kunming 650500,China)

机构地区：[1]云南大学信息学院,云南昆明650500

出　　处：《现代电子技术》2020年第7期25-28,共4页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(61162004)。

摘　　要：在基于调制宽带转换器(MWC)的频谱感知中,存在主用户数不确定而难以确定信号处理的通道数问题,为解决此问题提出一种能够自动调整通道数的自适应调制宽带转换器(AMWC)系统。同时,引入信号稀疏度自适应匹配追踪(AOMP)算法,结合AMWC系统,在信号子带数、稀疏度和最大带宽都未知的情况下,实现自适应的频谱感知。仿真实验结果证明,AMWC结合AOMP算法不仅能够快速、准确地恢复宽带稀疏信号的频谱,而且能够灵活地匹配信号子带数与通道之间的关系,可以应用在认知无线电中。In the spectrum sensing based on modulated wideband converter(MWC),there is a problem that the number of primary users is uncertain and it is difficult to determine the number of channels for signal processing.Therefore,an adaptive modulated wideband converter(AMWC)that can automatically adjust the channel number is proposed.The signal sparsity adaptive matching pursuit(AOMP)algorithm is introduced to realize adaptive spectrum sensing in combination with AMWC,when the number of signal sub-bands,sparsity and maximum bandwidth are unknown.The results of simulation experiment show that AMWC combined with AOMP algorithm can not only recover the spectrum of broadband sparse signal quickly and accurately,but also can flexibly match the relationship between signal sub-band quantity and channel,which can be applied to cognitive radio.

关 键 词：频谱感知 自适应调制宽带转换器 AOMP算法 稀疏信号 通道数 认知无线电 

分 类 号：TN761-34[电子电信—电路与系统]