Joint subcarrier and power allocation with threshold in cooperative multiuser networks  

作　　者：Tang Mingwei Wang Xiaoxiang 

机构地区：[1]Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, P.R.China

出　　处：《High Technology Letters》2011年第4期360-365,共6页高技术通讯（英文版）

基　　金：Supported by the National High Technology Research and Development Programme of China （No. 2009AA01Z247, No. 2007AA01Z265）, and the National Natural Science Foundation of China （No. 60972076）

摘　　要：In this paper, we investigate a resource allocation issue in OFDMA-based decode-and-forward cooperative multiuser networks and propose joint subcarrier and power allocation schemes. The optimal solution of this combinable allocation shows high computational complexity, so we allocate subcarriers and power separately. At firstly, we distribute subcarriers to relays and users under the assumption of equal power distribution. Here, we propose an equal capacity increment （ECI） allocation strategy to achieve tradeoff between total throughput and fairness. To further improve the system performance, we introduce threshold into ECI strategy, named ECI strategy with threshold （ECI-T）, where subcarriers with bad performance are prevented from transmitting. Subsequently, a water-filling method is adopted to distribute the power to cooperative links in order to fully utilize the limited power. Simulation results show that system performance of the proposed schemes is significantly enhanced compared with an existing resource allocation scheme. Besides, the resource allocation schemes with the water- filling method notably outperform schemes with equal power allocation.

关 键 词：cooperative communication orthogonal ~equency division multiplexing access （OFDMA） resource allocation THRESHOLD 

分 类 号：TN929.533[电子电信—通信与信息系统] TP308[电子电信—信息与通信工程]