认知无线电中的频谱检测判决融合技术研究
首发时间:2008-12-17
摘要:认知无线电技术可以有效缓解频谱分配与利用之间的矛盾。随着频谱资源日趋紧张,认知无线电技术成为无线通信领域新的研究热点。频谱检测技术是决定认知无线电是否能实现的关键技术之一。本文首先介绍了认知无线电中现有的单节点及多节点频谱检测技术,针对现有多节点频谱检测算法忽视了各个感知节点检测可靠性不同这一问题,本文又分析了一种基于信任度的多节点频谱检测算法。该算法将证据理论引入判决融合中,并以能量检测为例,推导了AWGN信道条件下的检测表达式,并得出结论:考虑各节点检测的可靠性的多节点频谱检测算法,在性能上明显优于现有的多节点频谱检测算法。
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Decision fusion of Spectrum detection in Cognitive Radio
Abstract:With the development of wireless communication technology, spectrum has become a scarce resource. Cognitive radio is a new concept to improve the useability of spectrum ,and spectrum detection is the key technology in Cognitive radio. This paper first introduces the main spectrum detection methods currently used in CR. As the existing cooperative detection methods all ignore the different reliablility between different nodes, this paper analyzes another detection method which is based on credibility of different nodes. By using D-S evidence theory and energy detection, this paper gives the expression of false alarm and detection probability in AWGN channel, and concludes that the performance of credibility-based spectrum detection is better than the currently used spectrum detection methods.
Keywords: Cognitive radio spectrum detection energy detection evidence theory
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No.2666836990412294****
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