认知无线电技术是目前无线传输领域的主要研究热点之一。对认知无线电的不同定义进行了讨论,并从认知无线电系统组成及认知无线电与其他无线电（特别是自适应无线电和智能无线电）的关系2方面分析了其内涵,重点介绍了无线频谱感知、智能资源管理、自适应传输和跨层设计等认知无线电系统主要关键技术;最后给出了认知无线电可能的应用场景。%Cognitive radio is one of the hot research topics in the wireless transmission domain.This paper first discusses the existing different definitions of the cognitive radio,and then analyzes the content of the cognitive radio according to the components of the cognitive radio system and the relationship between the cognitive radio and other radios.The paper mainly introduces the key technologies of the cognitive radio system such as spectrum sensing,intelligent resource management,adaptive transmission and cross-layer design,finally this paper presents the possible application scenarios for the cognitive radio.
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