Energy-efficient resource allocation for OFDMA relay systems with imperfect CSIT  

作　　者：WANG XiaoMing ZHENG FuChun ZHU PengCheng MENG Chao YOU XiaoHu 

机构地区：[1]National Mobile Communications Research Laboratory, Southeast University [2]School of Systems Engineering, University of Reading

出　　处：《Science China(Information Sciences)》2015年第8期126-138,共13页中国科学（信息科学）（英文版）

基　　金：supported by National Basic Research Program of China(973 Program)(Grant No.2012CB316004);National Natural Science Foundation of China(Grant Nos.61231009,61101086,61221002);National Hightech R&D Program of China(863 Program)(Grant No.2012AA011401)

摘　　要：In this paper, we propose an energy-efficient resource allocation scheme for the downlink of decode- and-forward relay-assisted orthogonal frequency division multiple access systems. The resource allocation is designed based on imperfect channel state information at the transmitter. We jointly optimize the power allocation, data rate allocation, and subcarrier allocation to maximize the system energy efficiency （EE）. We formulate the EE problem as a probabilistic mixed non-convex optimization problem, in which the individual power constraints and the outage probability requirements are considered. An iterative algorithm based on bisection method is given to transform the optimization problem into a standard concave form. Also, we consider a proportional fairness design for the EE maximization problem. Simulation results illustrate the effectiveness of the proposed algorithm.In this paper, we propose an energy-efficient resource allocation scheme for the downlink of decode- and-forward relay-assisted orthogonal frequency division multiple access systems. The resource allocation is designed based on imperfect channel state information at the transmitter. We jointly optimize the power allocation, data rate allocation, and subcarrier allocation to maximize the system energy efficiency （EE）. We formulate the EE problem as a probabilistic mixed non-convex optimization problem, in which the individual power constraints and the outage probability requirements are considered. An iterative algorithm based on bisection method is given to transform the optimization problem into a standard concave form. Also, we consider a proportional fairness design for the EE maximization problem. Simulation results illustrate the effectiveness of the proposed algorithm.

关 键 词：energy efficiency relay systems OFDMA DECODE-AND-FORWARD imperfect CSIT 

分 类 号：TN929.5[电子电信—通信与信息系统]