一个新的协作频谱感知算法认知无线电网络.doc

毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文 译文题目： 一个新的协作频谱感知算法认知无线电网络 　　　　　 学生姓名： 学　　号： 专　　业： 通信工程 所在学院： 龙蟠学院 指导教师： 田甜 职　　称： 讲师 2011年 12月 1日 说明： 要求学生结合毕业设计（论文）课题参阅一篇以上的外文资料，并翻译至少一万印刷符（或译出3千汉字）以上的译文。译文原则上要求打印（如手写，一律用400字方格稿纸书写），连同学校提供的统一封面及英文原文装订，于毕业设计（论文）工作开始后2周内完成，作为成绩考核的一部分。 A New Cooperative Spectrum Sensing Algorithm for Cognitive Radio Networks Abstract—spectrum sensing is a critical phase in building a cognitive radio network. However, the bandwidth for reporting secondary users’ sensing results will be insufficient, when the number of secondary user is very large. In this paper, we propose a new cooperative spectrum sensing algorithm to alleviate the bandwidth problem of reporting channel. Compared with conventional method, only the secondary users with reliable information are allowed to report their sensing results. When no user with reliable information, only the secondary user with highest reputation will report its sensing result. Simulation results show that our algorithm achieves better sensing performance and the average number of sensing bits decrease greatly. Keywords—cognitive radio; cooperative spectrum sensing; double threshold; reputation Ⅰ. INTRODUCTION Due to the increasingly development of wireless applications, more and more spectrum resources are needed to support numerous emerging wireless service. However, recent measurements by Federal Communication Commission (FCC) have shown that 70% of the allocated spectrum in US is not utilized [1]. In order to increase the efficiency of spectrum utilization, cognitive radio technology was recently proposed [2], [3]. A requirement of cognitive radios is that their transmission should not cause harmful interference to primary users. Namely, the sec