Evolutionary Approach for Efficient Resource Allocation in Multi-User OFDM Systems

Orthogonal Frequency Division Multiplexing is a promising technology for high data rate transmission in wideband wireless systems for achieving high downlink capabilities in the future cellular systems. To minimize the overall transmit power, the genetic algorithm approach was proposed for adaptive subcarrier and bit allocation based on channel state information. This is done by assigning one subcarrier for one user and each user a set of subcarriers and by determining the number of bits and the transmit power level for each subcarrier. The simulation results show that genetic algorithm approach produces better results compared to conventional algorithms in optimum power allocation. The results further conclude that genetic search helps fast convergence and can handle large allocations of subcarriers to users (many subcarriers to one user) without performance degradation.