Physical layer network coding for the multiple access relay channel

Muralidharan, Vijayvaradharaj T. ; Sundar Rajan, B. (2013) Physical layer network coding for the multiple access relay channel In: 2013 IEEE International Conference on Communications (ICC), 9-13 June 2013, Budapest, Hungary.

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Official URL: http://ieeexplore.ieee.org/document/6655053/

Related URL: http://dx.doi.org/10.1109/ICC.2013.6655053

Abstract

We consider the two-user wireless Multiple Access Relay Channel (MARC), in which nodes A and B want to transmit messages to a destination node D with the help of a relay node R. For the MARC, Wang and Giannakis proposed a Complex Field Network Coding (CFNC) scheme. As an alternative, we propose a scheme based on Physical layer Network Coding (PNC), which has so far been studied widely only in the context of two-way relaying. For the proposed PNC scheme, transmission takes place in two phases: (i) Phase 1 during which A and B simultaneously transmit and, R and D receive, (ii) Phase 2 during which A, B and R simultaneously transmit to D. At the end of Phase 1, R decodes the messages xA of A and xB of B, and during Phase 2 transmits f(xA, xB), where f is many-to-one. Communication protocols in which the relay node decodes are prone to loss of diversity order, due to error propagation from the relay node. To counter this, we propose a novel decoder which takes into account the possibility of an error event at R, without having any knowledge about the links from A to R and B to R. It is shown that if certain parameters are chosen properly and if the map f satisfies a condition called exclusive law, the proposed decoder offers the maximum diversity order of two. Also, it is shown that for a proper choice of the parameters, the proposed decoder admits fast decoding, with the same decoding complexity order as that of the CFNC scheme. Simulation results indicate that the proposed PNC scheme performs better than the CFNC scheme.

Item Type:Conference or Workshop Item (Paper)
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
ID Code:110095
Deposited On:08 Dec 2017 10:19
Last Modified:08 Dec 2017 10:19

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