Application of Improved Genetic Algorithm in the Channel Allocation of OFDMA System

OFDMA (Orthogonal Frequency Division Multiple Access) is the key technology of the fourth-generation mobile communication and has been applied to many communication standards. In this paper, genetic algorithm (GA) is applied to channel allocation of OFDMA system and is improved from three aspects: initial population, fitness function and user fairness. At the same time, combining improved genetic algorithm with greedy algorithm, Max-Min algorithm to do further improvement. Throughsimulation and comparison, author has found improved genetic algorithm can be used to compensate for defects of other algorithms in channel allocation, such as improve system throughput, ensure user fairness and reduce system time, which makes channel allocation scheme better and has certain practical application value in wireless communication system.