Source and Physical-Layer Network Coding for Correlated Two-Way Relaying

TL;DR

This paper introduces novel source and relay compression schemes combined with physical-layer network coding for correlated two-way relay channels, significantly improving error performance and throughput.

Contribution

It proposes two new compression schemes (SCPNC and RCPNC) for correlated two-way relay channels, with analytical error rate expressions and demonstrated performance gains.

Findings

Both schemes outperform non-compression methods in error rate.

Significant throughput improvements are achieved.

Closed-form BLER expressions are validated through simulations.

Abstract

In this paper, we study a half-duplex two-way relay channel (TWRC) with correlated sources exchanging bidirectional information. In the case, when both sources have the knowledge of correlation statistics, a source compression with physical-layer network coding (SCPNC) scheme is proposed to perform the distributed compression at each source node. When only the relay has the knowledge of correlation statistics, we propose a relay compression with physical-layer network coding (RCPNC) scheme to compress the bidirectional messages at the relay. The closed-form block error rate (BLER) expressions of both schemes are derived and verified through simulations. It is shown that the proposed schemes achieve considerable improvements in both error performance and throughput compared with the conventional non-compression scheme in correlated two-way relay networks (CTWRNs).