Robust Receiver Design for Non-orthogonal Multiple Access

TL;DR

This paper proposes a robust NOMA receiver that uses FEC code diversity to improve decoding performance and eliminate BER flooring, enhancing massive connectivity in future wireless networks.

Contribution

A novel NOMA receiver design employing FEC code diversity, which significantly improves BER performance over existing methods.

Findings

Substantial BER performance improvement

Elimination of BER flooring with proper interleaving

Enhanced robustness for massive connectivity

Abstract

Non-orthogonal multiple access (NOMA) has been proposed for massive connectivity in future generations of wireless communications. A dominant NOMA scheme is based on power optimization, in which decoding of target user is assumed to be perfect. In this work, rather than optimize on power domain, we are aimed to propose a robust receiver that can detect and decode the data streams of target user by FEC code diversity. Compared with existing NOMA receivers, our novel receiver substantially improves the bit-error-rate (BER) performance, and BER flooring can even be eliminated by assigning proper interleaving patterns to different users.