认知无线电网络信道选择机制①.PDFVIP

计 算 机 系 统 应 用 2016 年 第 25 卷 第 8 期 ① 认知无线电网络信道选择机制 薛 伟, 刘张超 (江南大学 物联网工程学院, 无锡 214122) 摘 要: 认知无线电网络通过动态频谱接入来提高无线频谱资源利用率, 而节点目标信道选择的优劣直接决定 了频谱接入性能的好坏. 本文首先综合考虑信道增益和空闲时间两种因素, 设计以实现最大化系统容量的目标 信道选择机制, 然后引入信道热度概念, 提出一种多属性决策信道选择机制. 仿真结果表明, 多属性决策信道选 择机制在系统吞吐量和频谱利用率性能上都有明显的提高. 关键词: 认知无线电网络; 动态频谱接入; 目标信道选择; 信道热度; 多属性决策 Channel Selection Mechanism in Cognitive Radio Networks XUE Wei, LIU Zhang-Chao (School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China) Abstract: To improve the utilization of wireless spectrum resource, the dynamic spectrum access is used in the cognitive radio network. However, the advantages and disadvantages of Node target channel selection directly determine the spectrum access performance. Firstly, by comprehensively considering the two factors of the channel gain and spare time, this paper designs a channel selection mechanism so as to realize the goal of maximizing the system throughput. Then this paper introduces the concept of channel heat and puts forward a channel selection mechanism based on multiple attribute decision. The simulation results indicate that channel selection mechanism based on multiple attribute decision apparently improves the system throughput and spectrum utilization performance. Key words: cognitive radio network; the dynamic spectrum access; target channel selection; channel heat; multiple attribute decision 随着无线通信技术的快速发展, 迅速增长的无线 认知无线电技术应用于无线通信网络中形成了认 通信业务需求以及现有静态无线频谱资源的管理、分 知无线电网络 CRN(Cognitive Radio Network)[3]. 它存 配和使用制度使得有限的频谱资源更加稀缺, 各频段 在两种用户: 授权用户 PU(Primary User)和认知用户 间频谱使用率不平衡且平均频谱使用率低下等问题出