A practical physical-layer network coding scheme for the uplink of the two-way relay channel

In this paper, we consider the two-way relay channel with the two-phase protocol. In the first phase, two terminals simultaneously transmit their packets to the relay, creating a multiple-access channel (MAC), while in the second phase the relay sends a network-coded combination of the two packets to both terminals. We focus on the multiple-access phase and propose a practical decoding scheme based on practical binary block codes in order to obtain the combined packet at the relay. This scheme is found to perform well for a wide range of code rates and is superior to lattice coding at low rates.

[1]  Michael Gastpar,et al.  Compute-and-Forward: Harnessing Interference Through Structured Codes , 2009, IEEE Transactions on Information Theory.

[2]  Alexander Sprintson,et al.  Joint Physical Layer Coding and Network Coding for Bidirectional Relaying , 2008, IEEE Transactions on Information Theory.

[3]  Michael Gastpar,et al.  Computation Over Multiple-Access Channels , 2007, IEEE Transactions on Information Theory.

[4]  David Declercq,et al.  Decoding Algorithms for Nonbinary LDPC Codes Over GF$(q)$ , 2007, IEEE Transactions on Communications.

[5]  Dirk Wiibben.  Joint channel decoding and physical-layer network coding in two-way QPSK relay systems by a generalized Sum-Product Algorithm , 2010, ISWCS 2010.

[6]  Dirk Wübben,et al.  Generalized Sum-Product Algorithm for Joint Channel Decoding and Physical-Layer Network Coding in Two-Way Relay Systems , 2010, 2010 IEEE Global Telecommunications Conference GLOBECOM 2010.

[7]  Sae-Young Chung,et al.  Network Coding for Two-Way Relay Channels using Lattices , 2008, 2008 IEEE International Conference on Communications.

[8]  Toshiaki Koike-Akino,et al.  Denoising Maps and Constellations for Wireless Network Coding in Two-Way Relaying Systems , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[9]  Soung Chang Liew,et al.  Physical-layer network coding: Tutorial, survey, and beyond , 2011, Phys. Commun..

[10]  Lajos Hanzo,et al.  Efficient Computation of EXIT Functions for Nonbinary Iterative Decoding , 2006, IEEE Transactions on Communications.

[11]  Deniz Gündüz,et al.  Collision Resolution in Slotted ALOHA with Multi-User Physical-Layer Network Coding , 2011, 2011 IEEE 73rd Vehicular Technology Conference (VTC Spring).

[12]  Michael Gastpar,et al.  Reliable Physical Layer Network Coding , 2011, Proceedings of the IEEE.