摘要
协作频谱感知能在一定程度上消除多径和阴影的影响,然而现有协作频谱感知方案均假设各认知用户处于静止状态,未考虑认知用户在协作感知期间的移动对检测性能的影响。针对上述问题,在集中式频谱检测方法的基础上,提出一种认知用户移动状态下的协作检测模型,使主用户处于静止状态,认知用户以一定速度作匀速直线运动。仿真及分析结果表明,随着移动认知用户速度的增大,运用线性融合规则的移动认知用户与静止认知用户协作检测性能均逐渐降低,因此需选择移动速度较小的认知用户作为协作对象以提高频谱感知的整体检测性能。
Cooperative spectrum sensing can partly eliminate the multi-path and shadow effect. At present,most researches on cooperative spectrum sensing assume that Cognitive User（ CU） is in static state,they do not consider that the CU mobility may make effect on the performance of cooperative spectrum sensing. In this paper,this factor about mobility of CU is considered and a model of dynamic cooperative spectrum sensing is put forw ard based on the centralized spectrum sensing. It makes that Primary User（ PU） is static and some other CU move in a straight line at different speed in the model. Simulation and analysis result show that the dynamic CU can not cooperate w ith the static CU w ell on spectrum sensing by using lineal fusing rule along w ith the CU speed up gradually,so it can choose the CU at low er speed as the cooperative CU to increase the probability of detection.
出处
《计算机工程》
CAS
CSCD
北大核心
2015年第4期77-80,共4页
Computer Engineering
基金
国家自然科学基金资助项目(60972063)
国家科技重大专项基金资助项目(2011ZX03002-004-02)
教育部高等学校博士学科点专项科研基金资助项目(20113305110002)
浙江省杰出青年科学基金资助项目(R1110416)
宁波市科技创新团队基金资助项目(2011B81002)
关键词
认知无线电
频谱感知
协作感知
认知用户
移动性
cognitive radio
spectrum sensing
cooperative sensing
Cognitive User（CU）
mobility
