基于认知无线电的合作频谱感知算法研究

摘要

Cognitive radio users need detective the existence of authorized users and idle band accurately and real-time in the cognitive radio networks. In the cognitive radio, cooperative spectrum sensing is similar to the distributed decision of wireless sensor network, that each sensor makes local decision and report these decision results to the fusion center, then making the final decision according to a certain fusion rule. Fusion rule is mainly divided into OR rule and AND rule. All cognitive user are involved in cooperation in the traditional cooperative spectrum sensing. This paper, through analysising the deficiency of the traditional cooperative spectrum detection, propose to choose those cognitive users that have higher SNR (Signal to Noise Ratio). We call this method for optimal cooperative spectrum detection. The detection performance by this method is better than the traditional cooperative detection algorithm.%在认知无线电网络中,认知无线电用户需要准确、实时地检测到授权用户的存在以及闲置的频带.认知无线电中的合作频谱感知类比于无线传感网络中的分布式决策,即每一个传感器做出本地判决并将这些判决结果汇报给融合中心,再根据某种融合准则做出最终的判决.融合准则主要分为OR规则和AND规则.传统合作频谱感知是指所有的认知用户都参与合作.文中通过分析传统合作频谱检测的不足之处,提出只选择具有较高信噪比的认知用户参与合作.从仿真结果看出,此方法的检测性能较之传统的合作检测算法有了很大的提高.