Average Throughput Link Adaptation using HARQ Information and MIMO Systems

In this article, we discuss about link adaptation (LA) for multiple-input multiple-output (MIMO) wireless systems. We present a cross-layer approach that takes into account a hybrid automatic repeat request (HARQ) information which is a medium access control layer (MAC) layer information. The expected throughput is then used in order to evaluate the influence of retransmissions in the average throughput. Therefore, we propose a modulation, coding and antenna scheme (MCAS) selection using HARQ information aiming to maximize the average throughput considering two different MIMO schemes: Alamouti and Bell labs layered space-time (BLAST).