Optimal Power Allocation for Real-Time Services in OFDM-Based Cognitve Radio Systems
In this paper, the adaptive power allocation problem on the downlink of a multiuser orthogonal frequency division multiplexing (OFDM) based cognitive radio (CR) systems with real-time (RT) services is investigated. The objective is to minimize the total transmit power of all CR users with satisfying the minimum bit rate requirements for RT services and limiting the interference to primary users (PUs) bands below a given threshold. The problem is formulated using convex optimization method and an optimal algorithm is proposed by efficient iteration to search the optimal solution, and the performance of the proposed algorithm is also estimated and compared with that of other methods by numerical simulations.
cognitive radio power allocation water-filling orthogonal frequency division multiplexing
Jian He Changqing Xu Li Li
Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, P.R.China
国际会议
北京
英文
196-199
2010-09-26（万方平台首次上网日期，不代表论文的发表时间）