Open AccessGeneralised selection at multi‐antenna sources in two‐way relay networks
Author(s) -
Wang Xinjie,
Yang Nan,
Zhang Hao,
Hoang Tiep Minh,
Gulliver Thomas Aaron
Publication year - 2016
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.2015.0110
Subject(s) - relay , rayleigh fading , antenna (radio) , ergodic theory , upper and lower bounds , beamforming , diversity gain , selection (genetic algorithm) , topology (electrical circuits) , maximal ratio combining , transmission (telecommunications) , computer science , mathematics , telecommunications , fading , mimo , power (physics) , combinatorics , physics , mathematical analysis , channel (broadcasting) , quantum mechanics , artificial intelligence
A generalised selection transmission (GST) and generalised selection combining (GSC) scheme is proposed for two‐way relay networks where two multi‐antenna sources exchange information via a single‐antenna relay. New exact and asymptotic expressions are derived for the outage probability and symbol error rate (SER) in Rayleigh fading. Moreover, a tight upper bound on the ergodic sum‐rate is presented. These results are used to demonstrate that the proposed GST/GSC scheme preserves the full diversity order, which equals the minimum number of antennas at the two sources. It is also shown that the impact of the number of selected antennas lies in the array gain only. Furthermore, the GST/GSC scheme significantly improves the performance relative to single‐antenna selection, and only incurs a negligible reduction in performance relative to all‐antenna beamforming. Finally, the optimal relay location that minimises the SER is determined analytically. It is observed that the optimal relay location shifts towards one source when the number of selected or available antennas at the other source increases.