Source and physical‐layer network coding for correlated two‐way relaying

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).

Exchange of Correlated Binary Sources in Two-Way Relay Networks Using LDPC Codes

“…To match the compression rates, LXS uses a randomly generated irregular LDPC code of rate N−M N = 1/3 following the degree distributions in [13, Table II] with a maximal left degree of 50 while we use primitive binary BCH codes with approximately the same code rate. The selected BCH codes are the (31, 11) and the (15,5) codes with error correction capabilities (ECCs) of 3 and 5, respectively. Fig.…”

“…This formulation resembles the problem of compression of binary sources with side information [4], which we extend to the case of TWR systems with additive white Gaussian noise (AWGN) channels (instead of a perfect link). SW-based compression has been also adopted in a parallel work [5] to propose source compression with PNC (SCPNC). SCPNC uses a linear block code with a correlation-dependent correction capability that guarantees the ability to retrieve the partner's message.…”

Low‐Complexity Estimation for Spatially Modulated Physical‐Layer Network Coding Systems

“…Recently, two-way relay systems have received much attention [1][2][3][4] as they not only can extend system coverage but also increase transmission efficiency. Among various two-way relay schemes, physical-layer network coding (PNC) [1][2][3][4][5] is known as an effective scheme as it allows the two terminal nodes to transmit at the same time and same frequency during multiple access phase, thus reducing the number of exchange phases to two. As a consequence, throughput and spectral efficiency of the PNC system are higher than those of the traditional network coding (NC) [6].…”