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中文摘要：
认知无线电（Cognitive Radio）是能够高效利用无线频谱资源和显著提高通信性能的智能无线通信技术，对于无线通信的发展具有积极作用和深远影响。本文首先介绍了认知无线电的提出背景、幕本概念和技术特点。其次，说明了认知无线电的工作机理并详细探讨了涉及的关键技术。最后，概述了认知无线电的标准化进展并展望了今后的工作。
英文摘要：
Cognitive Radio （CR） is an intelligent wireless communication technology which can utilize wireless spectrum resource efficiently and improve communication performance notably and it has positive effect and profound influence on the development of wireless communication. In this paper, backgrounds, concepts and characteristics of CR are introduced firstly. Then, working principles of CR is explained and key technologies are discussed. Finally, standardization process of CR is surveyed and future works are predicted.
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