Priority Swapping Subcarrier-User Allocation Technique for Adaptive Multicarrier Based Systems

Abstract

The aim of this paper is to discuss the use of adaptive subcarrier-user allocation in a multicellular environment. The paper also proposes a priority swapping based allocation algorithm that can utilise the diversity of the channel selectivity. The channel information required by the base-station for a successful detection of the received signals from the different users can be used by the proposed algorithm to enable the base-station to adaptively and speedily allocate the different subcarriers to its users such that the total throughput is maximised. This type of downlink transmission can best be likened to a frequency hopping (FH) system with the slight difference that the later uses a pseudorandom hopping pattern for each user while the former uses a dynamic-time-varying and channel-dependent orthogonal hopping pattern for each user. It will be shown that the algorithm proposed here has a very high convergence rate and achieves a diversity gain equivalent to that obtained using an optimum allocation algorithm based on the maximum likelihood criterion.