A Comparative Study of Full-Duplex Relaying Schemes for Low Latency Applications

TL;DR

This paper compares full-duplex relay schemes, AF and SDF, for low latency applications, analyzing their performance in different transmission modes to guide optimal scheme selection.

Contribution

It provides an exhaustive comparison of AF and SDF relaying schemes in full-duplex systems across two transmission modes, focusing on low latency performance.

Findings

AF is better in combining mode

SDF is better in non combining mode

Relays improve low latency communication

Abstract

Various sectors are likely to carry a set of emerging applications while targeting a reliable communication with low latency transmission. To address this issue, upon a spectrally-efficient transmission, this paper investigates the performance of a one full-dulpex (FD) relay system, and considers for that purpose, two basic relaying schemes, namely the symbol-by-symbol transmission, i.e., amplify-and-forward (AF) and the block-by-block transmission, i.e., selective decode-and-forward (SDF). The conducted analysis presents an exhaustive comparison, covering both schemes, over two different transmission modes, i.e., the non combining mode where the best link, direct or relay link is decoded and the signals combining mode, where direct and relay links are combined at the receiver side. While targeting latency purpose as a necessity, simulations show a refined results of performed comparisons, and reveal that AF relaying scheme is more adapted to combining mode, whereas the SDF relaying scheme is more suitable for non combining mode.