Non–linear network coding for two–way discrete channels
2009 (English)In: International Conference on Wireless Communications & Signal Processing 2009, 2009Conference paper (Refereed)
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
network coding, bidirectional relaying, two-way channel
IdentifiersURN: urn:nbn:se:kth:diva-66971DOI: 10.1109/WCSP.2009.537175ISBN: 978-1-4244-4856-2OAI: oai:DiVA.org:kth-66971DiVA: diva2:484786
QC 201202102012-01-272012-01-272012-02-10Bibliographically approved