一种基于主用户活动规律的认知OFDM系统功率分配算法  

Power Allocation Algorithm in OFDM-Based Cognitive Radio System Based on Primary User Activity

作　　者：任丙印[1] 李庆[1] 胡捍英[1] 仵国锋[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002

出　　处：《信息工程大学学报》2012年第2期173-177,共5页Journal of Information Engineering University

基　　金：国家科技重大专项资助项目(2009ZX03003-007);国家863计划资助项目(2009AA011504)

摘　　要：针对认知OFDM系统在总功率约束条件下的子载波功率分配问题,借鉴"Risk-Return"模型,并采用泊松过程来描述主用户的活动规律。通过定义损失函数和收益函数,综合考虑主用户到来和离去过程对系统性能的影响,进而给出一种基于主用户活动规律的功率分配算法。仿真结果表明,该算法容量性能优于单纯考虑主用户到来过程的算法。To solve the subcarrier power allocation problem under constraint on total power threshold in OFDM-Based cognitive radio system,this paper introduces ＂Risk-Return＂ model and adopts Poisson Process to describe primary users′ activity.The paper depicts the influence of primary users′ reoccupying and leaving process upon system performance at one time by defining a loss function and profit function,and therefore proposes a power allocation algorithm based on primary user activity.Simulation results show that the algorithm can obtain better capacity than the algorithm which merely considers primary users′ reoccupying.

关 键 词：认知无线电 OFDM 功率分配 主用户活动规律 

分 类 号：O224[理学—运筹学与控制论]