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Non–linear network coding for two–way discrete channels
School of Engineering and Applied Sciences, Harvard University, 33 Oxford Street, Cambridge, MA 02138, U.S.A.
Ericsson Research, Isafjordsgatan 14E, 164 93 Kista, Sweden.
Department of Communication Technology, Aalborg University, Niels Jernes Vej 12, DK-9220 Aalborg, Denmark.
School of Engineering and Applied Sciences, Harvard University, 33 Oxford Street, Cambridge MA 02138, U.S..
2009 (English)In: International Conference on Wireless Communications & Signal Processing 2009, 2009Conference paper (Refereed)
Abstract [en]

In this paper, we present optimal network coding which can maximize achievable rate region in two-way relaying discrete channels, where there are two communicating nodes and one relaying node. We focus on a low-complexity relaying protocol termed the detect-and-forward (DtF) scheme, in which the relaying node does not require channel decoding but detection. We first analyze the achievable rate region of any digital network coding function including non-linear types. We then search for the optimal network code in favor of maximizing two kinds of performance measures: the sum rate and the product rate. For high SNR regimes, linear network codes like the exclusive-or (XOR) function can offer the maximum-achievable rate region. Whereas, for low SNR regimes, it is verified that non-linear network codes like the negate-or (NOR) function can outperform linear codes due to the effect of error occurrence at the intermediate relaying node.

Place, publisher, year, edition, pages
Keyword [en]
network coding, bidirectional relaying, two-way channel
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-66971DOI: 10.1109/WCSP.2009.537175ISBN: 978-1-4244-4856-2OAI: diva2:484786
QC 20120210Available from: 2012-01-27 Created: 2012-01-27 Last updated: 2012-02-10Bibliographically approved

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Larsson, Peter
Communication Systems

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ReferencesLink to record
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