Relay ARQ strategies for single carrier MIMO broadband amplify-and-forward cooperative transmission

Abstract

Abstract-This paper investigates throughput-efficient relay ARQ protocols for single carrier MIMO systems with amplify-and-forward relaying. We focus on reducing the multiplexing loss due to the half-duplex operation at the relay. We introduce two new relaying protocols where both ARQ and relaying are jointly targeted. Compared to the conventional relaying techniques, the proposed mechanisms require only one time slot duration for transmitting the entire data packet at each ARQ round. We also focus on performance evaluation, and show that the new techniques provide significant improvement in average throughput while maintaining good outage probability performance.Index Terms-Amplify-and-Forward, ARQ, MIMO, cooperative relaying, outage probability, average throughput.

Turbo receiver design for MIMO relay ARQ transmissions

“…Also, each link {A → B} is characterized by the channel energy E AB capturing the effects of path loss and shadowing. To ensure high reliability and throughputefficient transmission, we assume that node S uses the Relay ARQ with slots mapping reversal (SMR) re-transmission strategy proposed recently in [5]. It suggests that node R performs the simple but crucial task of amplify-and-forward under the halfduplex mode.…”

“…We consider that the source node follows the Relay ARQ with slotmapping reversal (SMR) transmission strategy [5], where the ARQ mechanism is seen to be on top of the AF relaying Nabar's protocol I. In this context, we investigate practical turbo receiver design that addresses the above considerations while alleviating the computational load that may arise when the number of ARQ rounds increases.…”

Joint-over-Transmissions Project and Forward Relaying for Single Carrier Broadband MIMO ARQ Systems

“…Under the half-duplex constraint, activating ARQ on the top of relaying function enables the reduction of throughput loss in relay-aided transmissions. Several architectures focusing on the combination of ARQ and relaying have raised recently (see for instance [3] and references therein).…”