Schemes for Maximal Throughput and Fairness in Downlink OFDMA Systems

Orthogonal frequency division multiple access (OFDMA) systems emerge as potential choices for the development of the next generation (4G) mobile communications system mainly due to their bandwidth efficiency and capability of inter symbol interference (ISI) combat. Recently, dynamic resource allocation (DRA) technique is intensively studied to enhance system performance such as throughput maximization, power minimization, fairness and so forth. However, the tradeoff between maximal throughput and fairness gets more attention since it adapts to varying wireless network conditions as well as provides reasonable fairness among users. In this paper, we focus on achieving the tradeoff in the downlink case. A comparison between several DRA schemes is given to illustrate how to get the tradeoff in a downlink OFDMA system.