NDLI: A partial coherent detector for orthogonal modulations in two-way relay communications with physical network coding and fading

Content Provider	IEEE Xplore Digital Library
Author	Li, Xiaobin Ho, Paul
Copyright Year	2014
Description	Author affiliation: School of Engineering Science, Simon Fraser University, Burnaby, BC, Canada V5A 1S6 (Li, Xiaobin; Ho, Paul)
Abstract	We present in this paper a partial coherent receiver for detecting (at the relay) the modulo-2 sum bit of the uplink orthogonal modulations in a two-way relay communication system with physical network coding and fading. The detector exploits the availability of implicit pilot symbols in every signaling interval of an orthogonal modulation and is able to provide reasonably accurate data recovery without the need of sending pilot symbols. Using the characteristic function approach, we were able to derive a tight analytical upper bound on the bit-error-rate (BER) of the detector. The first component in the upper bound tells us that when the uplink symbols from the two users are identical, the BER approaches that of conventional point-to-point coherent detection, i.e. the multiple-access interference arising from physical network coding has no effect on the BER when the two data bits are identical. On the other hand, the second component in the upper bound shows that when the data from the two users are different, the BER increases dramatically. In essence, the BER of the proposed partial coherent detector is the average of those of the coherent and non-coherent detectors. We also outline in the paper a simple technique for achieving full coherent detection at the relay without resorting to transmitting any pilot symbols.
Starting Page	630
Ending Page	634
File Size	136160
Page Count	5
File Format	PDF
ISBN	9781479958320
DOI	10.1109/ICCS.2014.7024879
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-11-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Relays Bit error rate Fading Modulation Network coding Coherence partial coherent detection two-way relaying physical network coding orthogonal modulations implicit pilot symbols
Content Type	Text
Resource Type	Article

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