Advances in Cognitive Radio Networks: A Survey
Advances in Cognitive Radio Networks: A Survey
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DOI：
10.1109/jstsp.2010.2093210
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发表时间：
2011-02-01
影响因子：
7.5
通讯作者：
Liu, K. J. Ray
中科院分区：
文献类型：
--
作者：
Wang, Beibei;Liu, K. J. Ray
随着新的无线设备和应用的快速部署，过去十年见证了对无线无线电频谱日益增长的需求。然而，固定频谱分配策略成为更有效地利用频谱的瓶颈，在这种情况下，很大一部分许可频谱严重未得到充分利用。有限频谱资源的低效利用促使频谱监管机构重新审视其政策，并开始寻求创新的通信技术，以更智能、更灵活的方式利用无线频谱。认知无线电的概念是为了解决频谱效率问题而提出的，近年来受到越来越多的关注，因为它使无线用户能够根据与周围无线电环境的交互来最优地调整他们的操作参数。在过去的几年里，认知无线电有了许多重大的发展。本文综述了认知无线电相关研究的最新进展。首先介绍了认知无线电技术的基本原理、认知无线电网络结构及其应用。回顾了现有的频谱感知工作，并对动态频谱分配和共享中的重要问题进行了深入研究。
With the rapid deployment of new wireless devices and applications, the last decade has witnessed a growing demand for wireless radio spectrum. However, the fixed spectrum assignment policy becomes a bottleneck for more efficient spectrum utilization, under which a great portion of the licensed spectrum is severely under-utilized. The inefficient usage of the limited spectrum resources urges the spectrum regulatory bodies to review their policy and start to seek for innovative communication technology that can exploit the wireless spectrum in a more intelligent and flexible way. The concept of cognitive radio is proposed to address the issue of spectrum efficiency and has been receiving an increasing attention in recent years, since it equips wireless users the capability to optimally adapt their operating parameters according to the interactions with the surrounding radio environment. There have been many significant developments in the past few years on cognitive radios. This paper surveys recent advances in research related to cognitive radios. The fundamentals of cognitive radio technology, architecture of a cognitive radio network and its applications are first introduced. The existing works in spectrum sensing are reviewed, and important issues in dynamic spectrum allocation and sharing are investigated in detail.