认知无线电系统中频谱感知方法的研究  

Methods to Spectrum Sensing in Cognitive Radio

作　　者：邓韦[1] 朱琦[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《通信技术》2007年第11期76-77,80,共3页Communications Technology

基　　金：江苏省工业高科技研究项目(编号:BG2006039);江苏省高校自然科学研究计划(编号:05KJB510090)

摘　　要：由于无线通信技术的飞速发展,因此无线资源频谱日趋紧张。而另一方面现有无线通信网络采用的固定频谱分配策略导致许多已分配的频段在大多数情况下未能被充分利用。认知无线电技术的出现为提高频谱利用率提供了一条新的思路。认知无线电的一个重要要求就是能够动态的感知并接入频段,这就需要人们能够感知出空闲频段。论文主要介绍了认知无线电系统中的频谱感知方法,并运用能量检测法对对OFDM信号进行了仿真分析。With the rapid development of wireless communications technology, radio spectrum has become a scare resource. On the other hand, many frequency bands are not used efficiently in most time due to the fixed spectrum assignment policy of today＇ s wireless networks. Cognitive Radio is a novel approach for improving the utilization of radio spectrum. An important requirement of cognitive radio devices is to sense and use in a dynamic way the frequencies for network access, which is done by autonomous detection of idle bands in the spectrum radio. This paper focuses on various methods for detecting a signal embedded in the noise by specifying their advantages and their drawbacks. Thus, an energy detection method is applied in the detection of free channels.

关 键 词：认知无线电 频谱感知 能量检测 

分 类 号：TN911[电子电信—通信与信息系统]