Optimization of Subcarrier and Power Allocation in Uplink OFDMA Systems

The allocation of subcarriers and power to users is an important issue for exploiting the advantages of OFDMA systems. The main objective of the traditional OFDMA uplink resource allocation focuses on two aspects: one is to maximize the transmission rate of each user, the other is to minimize power. In this paper, we proposed the joint subcarrier and power allocation in the uplink of an OFDMA system thereby increasing the rate sum capacity of the system with low computational burden. The simulation results shows that the power efficiency of the proposed algorithm increases greatly over that of the Maximum marginal Rate subcarrier and WaterFilling power allocation, which is the optimal algorithm to derive the maximum transmission rate and the power utilization can be minimized.