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中文摘要：
认知无线电是一种可通过与其运行环境交互而改变其发射机参数的无线电，它可以提高频谱的利用率，特别是可让未授权用户使用授权用户的频谱，此外，它还为网络及终端提供了更高的灵活性。文中在描述认知无线电定义和概念模型的基础上，分析其特点和性能评估参数，结合已有研究，讨论了干扰温度、频谱汇聚共享、动态频谱管理等关键问题，并介绍了目前的研究进展。最后，针对应用需求，提出了几点研究设想。
英文摘要：
A cognitive radio （CR） is a radio that can change its transmitter parameters based on interaction with the environment where it operates. It can be used to improve the spectrum access and efficiency of spectrum use; especially it enables unlicensed users to use licensed spectrums. It also makes networks and terminals more flexible. This paper describes the definition and concept models of cognitive radio, analyzes its characteristics and performance assessing parameters, and discusses such key issues as interference temperature, spectrum pooling ＆ sharing, and dynamic spectrum management, introduces the current progress of the study. Finally, it provides a few research ideas according to application requirements.
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