北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2010, Vol. 33 ›› Issue (1): 120-123.doi: 10.13190/jbupt.201001.120.223

• 研究报告 • 上一篇    下一篇

认知OFDM网络中基于中断概率约束的功率分配

唐伦1,2;王欢2;陈前斌2;曾孝平1   

  1. (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)
  • 收稿日期:2009-09-04 修回日期:2009-11-19 出版日期:2010-02-28 发布日期:2010-02-28
  • 通讯作者: 唐伦

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

TANG Lun1, 2;WANG Huan2;CHEN Qian-bin2;ZENG Xiao-ping1   

  1. (1.College of Communication Engineering, Chongqing University, Chongqing 400044, China; 2.Key Laboratory of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)
  • Received:2009-09-04 Revised:2009-11-19 Online:2010-02-28 Published:2010-02-28
  • Contact: TANG Lun

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.

关键词: 认知无线电, 正交频分复用; 功率分配, 凸优化

Abstract:

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.

Key words: cognitive radio, orthogonal frequency division multiplexing, power allocation, convex optimization