衰落环境下一种高能效协作频谱感知算法

基于DS证据理论的协作频谱感知改进方法于美婷;赵林靖;李钊【期刊名称】《通信学报》【年(卷),期】2014(35)3【摘要】An improved cooperative spectrum sensing scheme based on dempster-shafer evidence theory in cognitive ra-dio networks was proposed. In the local sensing period, the projection approximation algorithm was introduced to reduce bandwidth for cooperation. In the fusion period, credibility was calculated by the distance between evidence vectors of different secondary users and adopted as the weights to combine different local sensing data. The new scheme reduces channel bandwidth and simulation results show that the new scheme improves the performance under the condition of high level conflict.%提出了一种新的协作频谱感知方法，该方法采用DS证据理论。

首先，在本地感知通过投影近似法分解感知结果以减少次级用户上报至融合中心的感知数据，从而降低协作带宽开销。

其次，在融合中心根据次级用户证据矢量之间的距离计算可信度，以可信度为权重对每个次级用户的基本概率分配进行加权平均来减小高度冲突数据对检测性能的影响。

第31卷第10期电子与信息学报 Vol.31No.10 2009年10月 Journal of Electronics & Information Technology Oct. 2009多天线感知无线电中的协作频谱感知算法杨黎王晓湘赵堃摘(北京邮电大学信息与通信工程学院北京 100876)要：不同于以往单天线感知用户的频谱感知研究，该文提出多天线情形下基于最优功率分配和协作分集的频谱感知算法。

根据信道条件利用奇异值分解(SVD)在每根天线上进行功率注水，并考虑多天线情况下两用户网络协作频谱感知授权用户的判决检测过程，利用基于指数衰减的路径损耗模型，分析多天线感知网络的各态历经容量和检测授权用户的概率及时间。

理论分析及仿真结果表明，多天线感知用户通过最优功率分配和协作频谱感知不仅使感知网络具有最大的各态历经容量，同时改善系统的检测性能。

关键词：感知无线电；协作频谱感知；多天线；功率分配中图分类号：TN92 文献标识码：A 文章编号：1009-5896(2009)10-2338-05 Cooperative Spectrum Sensing Algorithmin Multi-antenna Cognitive RadioYang Li Wang Xiao-xiang Zhao Kun(School of Information and Communication Engineering,Beijing University of Posts and Telecommunications, Beijing 100876, China) Abstract: Being different from previous spectrum sensing research for single-antenna cognitive users, a spectrum sensing algorithm based on optimal power allocation and cooperative diversity under multi-antenna scenario is proposed. It used Sigular Value Decomposition(SVD) to implement power water-filling on each antenna based on channel condition, and the detection process of the cooperative spectrum sensing for the primary user is considered in the two-user network with multi-antenna. The ergodic capacity, detection probability and detection time in cognitive network with multi-antenna are analyzed with path-loss model based on exponential attenuation. Theory analysis and simulation results show that cognitive users with multi-antenna can not only make the cognitive network have maximal ergodic capacity, but also improve detection performance of the system through optimal power allocation and cooperative spectrum sensing.Key words: Cognitive radio; Cooperative spectrum sensing; Multi-antenna; Power allocation1 引言感知无线电是一个实现频谱高利用率的智能无它的一项主要指标就是可靠地检测授线通信系统[1]，权用户的能力。