Optimal subchannel allocation scheme in multicell OFDMA systems

Abstract

In this paper, subcarrier allocation schemes for cellular orthogonal frequency division multiple access (OFDMA) systems with adaptive modulation and coding (AMC) is considered. An LP formulation with the constraints of quality-of-service (QoS) and limited bandwidth was made to achieve optimal system throughput. We propose an optimal subcarrier allocation scheme which allows cell coordination to assign subcarrier reuse factor and modulation scheme for each subcarrier. Also, to reduce computational complexity, a simplified cell coordination scheme is suggested. The capacity increase can be achieved by properly selecting modulation scheme and reuse factor of the subcarrier, which is validated by simulations.