【摘要】 随着信息技术的发展,无线通信得到广泛的应用,但同时人们面对频谱资源越来越匮乏的挑战。对授权用户而言,其频谱利用率极低,而对非授权用户而言,却找不到可以使用的频谱,这是导致频谱匮乏的重要原因之一。认知无线电作为无线通信的热点研究领域,它为提高频谱利用效率、解决频谱匮乏问题提供了技术支持,使研究人员看到了希望。文中分析认知无线电研究现状,讨论认知无线电研究的主要技术难题和最新进展,并提出新的发展方向。更多还原

【Abstract】 With the development of information technology,wireless communication has been extensively applied,thus causing a shortage of spectral resource.For granted users,their spectrum is not used effectively,while for ungranted users,they could not find the available spectrum.This is one of the principal causes for shortage of spectral resource.Cognitive radio,as the focus in wireless communication research,provides a technology for making full use of spectral resource and overcoming the problem of spectral shortage.This paper analyzes the current situation of cognitive radio reseach,discusses the main challenge and the new progress,including the future development of cognitive radio.更多还原