NDLI: Physical layer network coding for the multiple access relay channel

Content Provider	IEEE Xplore Digital Library
Author	Muralidharan, V.T. Rajan, B.S.
Copyright Year	2013
Description	Author affiliation: Dept. of ECE, IISc, Bangalore, India (Muralidharan, V.T.; Rajan, B.S.)
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 $x_{A}$ of A and $x_{B}$ of B, and during Phase 2 transmits $f(x_{A},$ $x_{B}),$ 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.
Starting Page	3292
Ending Page	3296
File Size	246191
Page Count	5
File Format	PDF
ISBN	9781467331227
ISSN	15503607
DOI	10.1109/ICC.2013.6655053
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-09
Publisher Place	Hungary
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decoding Relays Network coding Complexity theory Wireless communication Signal to noise ratio Physical layer
Content Type	Text
Resource Type	Article

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