认知无线电系统中搜索空闲信道的平均时间优化算法  

Optimization Scheme of Average Time for Finding Idle Channel in Cognitive Radio System

作　　者：乔培[1] 肖丽媛[1,2,3] 韩妍妍[4] 高岭[1] 

机构地区：[1]西北大学,陕西西安710127 [2]西安电子科技大学,陕西西安710071 [3]中央编办事业发展中心,北京100028 [4]北京电子科技学院,北京100070

出　　处：《系统仿真学报》2016年第3期727-732,共6页Journal of System Simulation

基　　金：国家自然科学基金(61373176);国家科技支撑计划(2012BAH16B00);信息安全国家标准(2013bzzd-WG1-005)

摘　　要：为了保证主用户在传输数据过程中不受次级用户的干扰,认知无线电系统中次级用户采用了周期频谱检测技术来检测空闲信道。假设系统中存在多条主用户信道,当检测出当前使用的主用户信道被占用时,次级用户进行频谱切换。频谱切换过程中搜索空闲信道的时间是个随机变量。为了加速频谱切换,采用等增益合并合作频谱检测模式来进行空闲信道的检测,这种模式优化单个信道的检测时间,可以达到使搜索空闲信道平均时间最短的效果。研究了在不同仿真参数的情况下,系统存在相应的最优单个信道检测时间,以及对应最短搜索空闲信道的平均时间。In cognitive radio system, periodic spectrum sensing was taken by secondary users to prevent the interference to primary users. Supposed that there are many primary user channels, when the current primary user occupies channel, secondary users do spectrum handover. During spectrum handover, the time of finding an idle channel is a random variable. In order to speed up spectrum handover, the system used equal gain combining cooperative spectrum sensing to inspect an idle channel. This pattern optimized the sensing time of the single user channel, in order to get the best effect of the average time in finding idle channel Using different simulation parameters, there are accordingly optimal sensing times of the single channel, and the corresponding different shortest average time of finding idle channel

关 键 词：认知无线电 频谱检测 频谱切换 软合并 优化 

分 类 号：TN911.23[电子电信—通信与信息系统]