Abstract–Orthogonal Frequency Division Multiplexing is apromising technology for high data rate transmission inwideband wireless systems for achieving high downlinkcapabilities in the future cellular systems. To minimize theoverall transmit power, the genetic algorithm approach wasproposed for adaptive subcarrier and bit allocation basedon channel state information. This is done by assigning onesubcarrier for one user and each user a set of subcarriersand by determining the number of bits and the transmitpower level for each subcarrier. The simulation results showthat genetic algorithm approach produces better resultscompared to conventional algorithms in optimum powerallocation. The results further conclude that genetic searchhelps fast convergence and can handle large allocations ofsubcarriers to users (many subcarriers to one user) withoutperformance degradation.

Index Terms–adaptive power allocation, Genetic Algorithm,fitness, subcarrier, OFDM, frequency, bit error rate

Cite: Yenumula B. Reddy and Nandigam Gajendar, "Evolutionary Approach for Efficient Resource Allocation in Multi-User OFDM Systems," Journal of Communications, vol. 2, no. 5, pp. 42-48, 2007.