A joint adaptive packet size and modulation scheme combined with SR-ARQ over correlated fading channels

Abstract

Conventional adaptive transmission schemes perform poorly in wireless correlated slow-fading channels. In this paper, a joint adaptive packet size and modulation (APSM) scheme combined with selective repeat automatic repeat request (SR-ARQ) is proposed. We apply a multi-state Markov system model for analyzing the performance of APSM/SR-ARQ systems and optimizing the selection of modulation levels and packet sizes in correlated fading channels, which is also described by a finite-state Markov chain. A general closed-form expression of the average throughput for APSM/SR-ARQ is presented. Numerical results show that our adaptive scheme combined with SR-ARQ can obtain a good performance in correlated fading channels.