Physical-layer network coded QAM with trellis shaping for the two-way relay channel

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Title: Physical-layer network coded QAM with trellis shaping for the two-way relay channel
Authors: Donati, DanielaFlanagan, Mark F.
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Date: 9-Nov-2016
Online since: 2019-10-07T14:20:31Z
Abstract: Physical-layer network coding (PNC) allows to improve the throughput on the two-way relay channel (TWRC). PNC systems using higher-order modulation present some challenges regarding how to design the PNC mapping at the relay. With higher-order modulation it is also desirable to use constellation shaping which allows to minimize the average transmitted energy. In this paper, we show how low-complexity trellis shaping can be used to provide constellation shaping both at the user nodes and at the relay node. The proposed technique works specifically for sign bit shaping and M-ary quadrature amplitude modulation (QAM). Simulation results show that the proposed scheme provides a significantly increased performance in terms of the achievable BER, with 5.3dB shaping gain available at a BER of 10-3 in the case of 256-QAM signaling.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: IEEE
Start page: 250
End page: 254
Copyright (published version): 2016 IEEE
Keywords: RelaysQuadrature amplitude modulationConvolutional codesNetwork codingIndexesDetectors
DOI: 10.1109/ACSSC.2016.7869035
Language: en
Status of Item: Peer reviewed
Is part of: Fiftieth Asilomar Conference on Signals, Systems & Computers, November 6-9 2016, Pacficic Grove, California
Conference Details: 2016 50th Annual Asilomar Conference on Signals, Systems, and Computers (ASILOMAR 2016), California, United States of America, 6-9 November 2016
ISBN: 9781538639542
Appears in Collections:Electrical and Electronic Engineering Research Collection

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