Turbo-like Iterative Multi-user Receiver Design for 5G Non-orthogonal Multiple Access

TL;DR

This paper reviews NoMA transceiver development for 5G, emphasizing turbo-like iterative multi-user receivers, and highlights EPA with hybrid PIC as an efficient solution with fast convergence and low complexity.

Contribution

It provides an overview of NoMA transceiver progress in 3GPP and identifies EPA with hybrid PIC as a promising low-complexity, fast-converging MU receiver.

Findings

EPA with hybrid PIC achieves fast convergence.

EPA with hybrid PIC has similar performance to MPA.

EPA with hybrid PIC offers lower complexity.

Abstract

Non-orthogonal multiple access (NoMA) as an efficient way of radio resource sharing has been identified as a promising technology in 5G to help improving system capacity, user connectivity, and service latency in 5G communications. This paper provides a brief overview of the progress of NoMA transceiver study in 3GPP, with special focus on the design of turbo-like iterative multi-user (MU) receivers. There are various types of MU receivers depending on the combinations of MU detectors and interference cancellation (IC) schemes. Link-level simulations show that expectation propagation algorithm (EPA) with hybrid parallel interference cancellation (PIC) is a promising MU receiver, which can achieve fast convergence and similar performance as message passing algorithm (MPA) with much lower complexity.