WLC32-1: ARQ for MIMO OFDM Systems with Non-Linear Preprocessing

In this paper, we develop a selective-repeat automatic-repeat-request (SR-ARQ) transmission scheme for multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems with non-linear preprocessing assuming perfect channel state information at both the transmitter and the receiver. In such a system in every time slot for ARQ transmission, there are a group of parallel channels of equal rate and differing error probability available between the transmitter and the receiver. Based on the knowledge of the signal to noise ratio (SNR) of these parallel channels, which is known to both the transmitter and the receiver, we first propose a dynamic parallel channel grouping rule to group parallel channels into effective channels, over which one packet is transmitted in one time slot, and we prove that this dynamic channel grouping rule will achieve maximum throughput. Furthermore, we adopt the dynamic channel assignment rule introduced by Shacham and Shin to assign packets to the effective channels in order to reduce resequencing delay. simulations in a frequency selective fading channel demonstrate the advantage of the proposed dynamic SR- ARQ transmission scheme over systems with a static parallel channel grouping rule and a static channel assignment rule in terms of throughput and resequencing delay.