Simulation of dynamic resource allocation in OFDMA systems

Adaptive resource allocation is an active study direction for OFDMA systems, which needs to satisfy both high spectrum utilization and QoS requirements in wireless channel environment. Proportionality fairness resource allocation algorithms were studied to keep user fairness while optimizing system capacity as possible. Simulation results show that under the proportional rate constraints, after the first turn of subcarrier allocation in each OFDM symbol, giving priority to the user with lower data rate to choose its optimal subcarrier can achieve higher system capacity compared with assigning the rest resource to the higher data rate user, or to the user whose data rate will achieve to a higher peak among all users. The discussed algorithms function well to keep proportional fairness with relatively small complexity.