On a novel subcarrier allocation scheme based on Hungarian method for OFDMA system

This paper investigated the subcarrier allocation problem in Orthogonal frequency division multi-plexing access (OFDMA) system, which is crucial to realize the multiplexing access of users and improvement of system performance. In modern communication system with increasing rich multimedia contents, users require different target data rates corresponding to various kinds of services. Therefore, the proportionality of data rates among users poses a challenge for the traditional subcarrier allocation methods for OFDMA system. To achieve the proportional fairness among users, this paper proposed a novel subcarrier allocation scheme based on Hungarian method. Moreover, the proposed scheme was further improved in two ways-subset based and group based allocation-to achieve even better performance in terms of proportionality and computational complexity. Simulation results show that the proposed scheme can offer more accurate proportional distribution of capacity among users and the computational complexity could be reduced with small performance degradation.