Scalar Quantize-and-Forward for Symmetric Half-duplex Two-Way Relay Channels

TL;DR

This paper investigates scalar Quantize-and-Forward schemes for symmetric half-duplex two-way relay channels, comparing approaches, proposing a simplified coding scheme, and optimizing quantizer design through a numerical algorithm, supported by simulations.

Contribution

It introduces a new QF scheme that avoids Slepian-Wolf coding at the relay and develops a numerical optimization method for quantizer design.

Findings

Proposed a QF scheme without Slepian-Wolf coding.

Derived a Blahut-Arimoto-like algorithm for quantizer optimization.

Validated results through simulations.

Abstract

Scalar Quantize & Forward (QF) schemes are studied for the Two-Way Relay Channel. Different QF approaches are compared in terms of rates as well as relay and decoder complexity. A coding scheme not requiring Slepian-Wolf coding at the relay is proposed and properties of the corresponding sum-rate optimization problem are presented. A numerical scheme similar to the Blahut-Arimoto algorithm is derived that guides optimized quantizer design. The results are supported by simulations.