Hexagonal Constellations for Adaptive Physical-Layer Network Coding 2-Way Relaying

We focus on a constellation design for adaptive physical-layer network coding strategy in a wireless 2-way relay channel. It is well known that 4QAM constellations require extended-cardinality network coding adaptation to avoid all singular channel parameters at the Multiple-Access (MA) stage. The c...

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Bibliographic Details
Published in:IEEE communications letters 2014-02, Vol.18 (2), p.217-220
Main Authors: Hekrdla, Miroslav, Sykora, Jan
Format: Article
Language:English
Subjects:
Adaptive systems
Applied sciences
Artificial intelligence
constellation design
Constellation diagram
Exact sciences and technology
Indexing
Lattices
Network coding
Physical-layer network coding
Relays
Switching and signalling
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
wireless two-way relaying
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Summary:We focus on a constellation design for adaptive physical-layer network coding strategy in a wireless 2-way relay channel. It is well known that 4QAM constellations require extended-cardinality network coding adaptation to avoid all singular channel parameters at the Multiple-Access (MA) stage. The cardinality extension is undesirable since it introduces redundancy decreasing the data rates at the broadcast stage. In this paper, we target a design of constellations avoiding all the singularities without the cardinality extension. We show that such a constellation is 4-ary constellation taken from hexagonal lattice (4HEX) which keeps comparable error performance at the MA stage as 4QAM, however without the cardinality extension. The similar properties has been found also by unconventional 3HEX and 7HEX constellations.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2013.122713.132526