双选择性衰落信道下的频谱感知  

Spectrum Sensing over Doubly-Selective Fading Channels

作　　者：朱翠涛[1] 刘文博[1] 

机构地区：[1]中南民族大学电子信息工程学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2015年第1期89-92,共4页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(61103248);湖北省自然科学基金资助项目(2013CFB448)

摘　　要：为提高双选择性衰落信道环境下频谱感知性能,提出了一种基于改进的复指数基扩展模型进行信道建模的频谱检测方法.该方法是在一般的复指数基扩展模型的基础上,采用一种能自适应移动速度的基函数,在恒虚警概率条件下,利用接收信号的循环特征,对授权用户的频谱进行感知.实验结果表明,在低信噪比和认知用户移动速度不断变化的环境下该方法有较好的检测性能.To improve the spectrum sensing performance over doubly-selective fading channels,this paper puts forward a spectrum detection method for channel modeling based on the modified complex exponential basis expansion model. For better reflecting the facticity of the channel,on the basis of complex exponential basis expansion model,we adopt the basis function which can be adaptive to mobile speed. Under the conditions of constant false alarm rate,the spectrum detection of authorized user is getting by using the cyclostationary feature of received signal. The simulation results show that the proposed method will get better detection performance in the low SNR and the dynamic moving speed environment for CR users.

关 键 词：认知无线电 双选择性衰落信道 频谱感知 基扩展模型 自适应速度 

分 类 号：TN911[电子电信—通信与信息系统]