Resource allocation for OFDMA downlink with QOS consideration

Performance optimization of communication networks with quality of services (QOS) considerations for all active users is highly desirable. Using minimum data rate as the primary criterion for the QOS, in this paper, we provide a resource allocation solution for an OFDMA downlink which gets to be optimum when the number of subcarriers goes infinity and the proposed algorithm satisfies QOS of all users. We analyze the complexity of this solution and propose a sub-optimum solution with much less complexity. These solutions are compared using simulation results.