概率反馈动态频谱分配策略及性能分析  

Dynamic spectrum allocation strategy with probabilistic feedback mechanism and performance analysis

作　　者：金顺福[1,2] 葛世英[1,2] 霍占强[3] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004 [2]河北省计算机虚拟技术与系统集成重点实验室,河北秦皇岛066004 [3]河南理工大学计算机科学与技术学院,河南焦作454000

出　　处：《通信学报》2015年第7期10-17,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(61472342;11201408);河北省自然科学基金资助项目(2012203093)~~

摘　　要：为了折衷认知用户吞吐量与平均时延,并适应多种网络业务需求,在认知无线电网络中引入概率反馈机制和能量检测阈值,提出一种新的动态频谱分配策略。针对认知用户的非理想感知结果,建立一种2类用户可能相互干扰的优先级排队模型,并构造状态转移概率矩阵。采用矩阵几何解方法求出系统的稳态分布,给出信道利用率、认知用户吞吐量、认知用户平均延迟及授权用户干扰率等性能指标的表达式。通过数值实验和系统仿真验证所提动态频谱分配策略性的有效性,并给出能量检测阈值的优化设置方案。By introducing probabilistic feedback mechanism and energy detection threshold to cognitive radio networks, a novel dynamic spectrum allocation strategy is proposed to trade off the throughput and average delay of secondary users, as well as meet various network requirements. Considering the imperfect sensing results of secondary users, a kind of priority queueing model is established, in which two classes of users may interfere with each other, then the state transition probability matrix is constructed. Employing the method of matrix-geometric solution, the stationary distribution of system model is derived. Accordingly, the expressions for the performance measures in terms of channel utilization, throughput of secondary users, average delay of secondary users and interference ratio of primary users are given. With numerical experiments and system simulations, the effectiveness of the proposed dynamic spectrum allocation strategy is verified. Finally, the optimal design of energy detection threshold is provided.

关 键 词：认知无线电网络 动态频谱分配策略 概率反馈 非理想感知 优先级排队模型 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]