认知OFDM网络中基于中断概率约束的功率分配  

Power Allocation for Cognitive OFDM Radio Networks under Primary User's Outage Probability Constraint

作　　者：唐伦[1,2] 王欢[2] 陈前斌[2] 曾孝平[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044 [2]重庆邮电大学移动通信技术重点实验室,重庆400065

出　　处：《北京邮电大学学报》2010年第1期120-123,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家科技重大专项项目(2008ZX03003-005);新世纪优秀人才支持计划项目(NCET-06-0778);重庆市教育委员会科学技术研究项目(KJ090501)

摘　　要：研究了认知正交频分复用(OFDM)系统的容量极限及最优功率分配策略.为限制主用户中断概率,建立了在主用户接收端中断概率受限下最大化认知用户传输速率的数学优化问题,并利用拉格朗日乘数法得到该问题的最优解.仿真结果表明,所提算法将主用户中断概率限制在其可容忍范围内的同时,最大化了认知用户的传输速率.The optimal power allocation strategy of cognitive orthogonal frequency division multiplexing （OFDM） system is studied. In order to limit primary user＇s outage probability, the optimization is formulated maximizing the capacity of cognitive user under the constraint of outage probability at the primary receiver, and the optimal solution to the problem is obtained by utilizing the Lagrange method. Simulation shows that this scheme can efficiently limit primary user＇s outage probability to its tolerable range while maximizing secondary user＇s transmission rate.

关 键 词：认知无线电 正交频分复用 功率分配 凸优化 

分 类 号：TN929.5[电子电信—通信与信息系统]