Open AccessSelective physical layer network coding in bidirectional relay channel
Author(s) -
Mahdavi Ala,
Jamshidi Ali,
KeshavarzHaddad Alireza
Publication year - 2017
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2017.0642
Subject(s) - relay , rayleigh fading , linear network coding , computer science , throughput , channel (broadcasting) , relay channel , phase shift keying , fading , computer network , node (physics) , channel state information , topology (electrical circuits) , bit error rate , wireless , telecommunications , physics , engineering , electrical engineering , power (physics) , quantum mechanics , network packet
In this paper, the authors show that using physical layer network coding (PNC) in wireless relay systems does not always increase throughput performance, and to achieve maximum throughput, PNC should be exploited intelligently regarding to the channel conditions. In this study, they propose a selective PNC (SPNC) scheme in bidirectional relay systems for binary phase shift keying. In the proposed scheme, the relay chooses either to detect network‐coded data from superimposed signal by PNC scheme or single source data by a so‐called single node detection (SND) scheme, based on which offers more end‐to‐end throughput for current channel realisation. They analytically determine the region of channel state plane in which SPNC selects SND scheme. Also, they obtain expressions for instantaneous bit error rates (BERs) of PNC and SND protocols. Moreover, they derive upper bounds in closed‐form for average BERs of PNC and SND schemes during multiple access phase at the relay. Then, they investigate SPNC with high‐order modulations. Simulations and analytical results confirm that SPNC achieves considerable throughput gain over PNC in Rayleigh fading channels.