噪声功率不确定下基于能量的频谱检测分析(英文)  

Analysis of energy detection based spectrum sensing in noise of uncertain power

作　　者：崔太平[1] 陈前斌[1] 申滨[2] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]韩国仁荷大学情报通信大学院,韩国仁川402751

出　　处：《重庆邮电大学学报（自然科学版）》2008年第4期397-402,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：the Program for NewCentury Excellent Talents in University(NCET-06-0778)from Ministry of Education of the People's Republic of China

摘　　要：感知无线电是一项有希望提高频谱利用率的技术,在不干扰授权用户的前提下,通过协商或者机会地与授权用户共同占用频谱资源。实现感知无线电技术的关键就是如何可靠地检测授权用户使用的频谱情况。基于能量的频谱检测实现简单,能够快速地检测频谱的占有情况,但是也有很多缺点,比如易受噪声的影响。近几年基于能量的频谱检测得到广泛研究,但是,在噪声功率不确定情况下的频谱检测研究却不多。针对这一问题,从不同的角度分析了在噪声功率不确定情况下的基于能量的频谱检测,分析了最坏情况下的性能。最坏情况下的性能用信噪比、时间带宽积和噪声不确定峰值比的函数表示。从仿真结果中可以看出,即使不确定的噪声功率是一个很小数量,也会造成检测性能的大幅下降,而且在瑞利衰落信道下性能更差。Cognitive radio （CR） is viewed as a promising technology to improve spectrum utilization via negotiated or opportunistic spectrum sharing without interference to primary or licensed users, and the key challenge of the new system implementation is the reliable detection of presence of primary users. Energy detection based spectrum sensing is quite simple and is able to locate spectrum-occupancy information quickly, but it has some limitations such as vulnerability to noise. Energy detection has been studied widely in recent years, but the effect of noise power uncertainty is seldom evaluated in relevant literatures, especially in fading channels. This paper presents an- other look at the problem of energy detection of unknown signals in noise of uncertain power. Worst case performance bounds are provided as a function of input signal-to-noise ratio （ SNR）, time-bandwidth product （TW） and peak-to-peak noise uncertainty （U）. Even with a small fraction of noise-level uncertainty, the performance of detection degrades heavily. An even worse result than is indicated by the standard result is given in Rayleigh fading channels.

关 键 词：能量检测 频谱检测 不确定的噪声功率 感知无线电 

分 类 号：TN929.5[电子电信—通信与信息系统]