An efficient dynamic resource allocation algorithm for downlink MIMO - OFDMA systems

Abstract

Multiple Input Multiple Output (MIMO) - Orthogonal Frequency Division Multiple Access (OFDMA) systems provide high spectral efficiency due to its integrated space-frequency and multi-user diversity. In this paper a Dynamic Resource Allocation (DRA) scheme has been devised for MIMO - OFDMA systems in a downlink scenario. The scheme optimizes the power distribution and guarantees desired Quality of Service (QoS) to each user. The available channel state information at the Base Station (BS) is utilized in order to help these practical schemes to improve system performance and to satisfy various QoS constraints. Computer simulation results demonstrate the proposed scheme performance with the comparison of previous allocation schemes and the proposed scheme satisfy the proportionality constraints and achieves high system capacity.