Re-Transmission Diversity Multiple Access based on SIC and HARQ-IR

TL;DR

This paper introduces a novel multiple access scheme combining re-transmission diversity with SIC and HARQ-IR, improving decoding success and outperforming existing schemes in multi-user communication systems.

Contribution

It proposes new RTxD random access schemes utilizing SIC and HARQ-IR, with derived conditions for successful decoding and performance analysis.

Findings

Proposed schemes outperform existing RTxD methods in simulations.

Derived decoding conditions ensure successful multi-user reception.

Schemes utilize multichannel access in power and rate domains.

Abstract

We consider multiple access with re-transmission diversity (RTxD) based on a hybrid automatic request (HARQ) protocol with incremental redundancy (IR) in this paper. In order to mitigate multiple access interference (MAI), we employ successive interference cancellation (SIC) at a receiver and derive conditions that all the signals from active users can be successfully decoded within a certain number of re-transmissions of IR blocks. We consider two special cases, and based on them we derive two multichannel random access schemes that have subchannels in the power and rate domains. Through the analysis and simulations, we can show that the proposed RTxD random access schemes can outperform other existing similar RTxD random access schemes.