Performance analysis on subcarrier allocation algorithm for utility fairness in OFDMA systems

Utility theory based subcarrier allocation algorithms for OFDMA systems are discussed in this paper. Two suboptimal subcarrier allocation algorithms (UPF and NBS) under the utility proportional fairness criterion and Nash bargaining solution criterion are given, which both consider the tradeoff between utility fairness of users and system capacity. Furthermore, compared with rate proportional fairness scheduling algorithm (named RPF) and subcarrier allocation algorithm for utility sum maximization (named USM), the performance of utility based subcarrier allocation algorithms is analyzed. In the mixed traffic of non real-time video and best effort scenario, the simulation results show that, UPF and NBS not only can provide utility fairness among users with different applications, but also can guarantee the quality of service of users.