A Double-Criterion Throughput-Based Sub-carrier Allocation for Multi-user OFDM System

In recent years, Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in many wireless communication systems, including LTE and WiMAX. Bandwidth is always precious over wireless channel, so it is important to have an effective bandwidth arrangement. On a multi-user system, each user needs to share entire bandwidth with others. In order to enhance the transmission rate, how to perform a proper arrangement on wireless channel becomes essential. In this paper, we propose a method which utilizes the estimated Channel State Information (CSI) to achieve this goal. We allocate sub-carrier to each user by double criteria with throughput-based sub-carrier allocation, and use adaptive modulation to maximize data rate. The simulation results show that the proposed method achieves better performance than that of the referred algorithms with the single criterion.