Subcarrier Allocation for Multiuser OFDM System Based on Throughput

Orthogonal frequency division multiple access (OFDMA) becomes one of the high data rate wireless communication systems in recent years, and is a multi-user technique derived from Orthogonal Frequency Division Multiplexing (OFDM). Each user has different channel response due to the propagation path, and uses the proper modulation and allocation on subcarriers to get higher transmission rate. Subcarrier allocation and adaptive modulation techniques are subject to multi-user diversity and feedback channel state information. In this paper, we propose a throughput-based subcarrier allocation, and compare three referred algorithms with the proposed method to those without the proposed method, in different channel states. We propose two algorithms to compare with those algorithms, and the simulation results show that the proposed method achieves better performance than that of the referred algorithms with the maximum data rate.