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Semi-Blind Dual-Hop Relay Selection based on the First Relaying Hop

Authors:
John F. An
Sheng Yang
Sheng Yuan Wu

Keywords: Relaying network; dual-hop; outage probability; maximum a posteriori probability; Rayleigh fading.

Abstract:
In this paper, we propose a novel relay selection scheme based on the maximum a posteriori (MAP) decision criterion for a dual-hop semi-blind (DHSB) amplify-and-forward (AF) relaying, where only long-term channel statistics at the first relaying hops are taken into consideration. The observed channel gain vectors across the cluster of the first hops are provided to the selection algorithm, which then selects the relay node which has the “most likely highest probability of channel power gain distribution” using a posteriori likelihood ratio over a burst time period. The other selection scheme based on the maximum first-hop signal-to-noise power ratio (SNR) is also compared, taking into account sample mean of channel power gain. Fixed gain relaying is adopted to constrain our DHSB system for both MAP and first-hop SNR based relay selection schemes. The outage performance of max-min sense end-to-end SNR relay selection, as a conventional scheme and benchmark, is compared to our proposed schemes. Simulation results demonstrate that, in terms of outage performance, our proposed MAP-based relay selection scheme is particularly appropriate for a DHSB relaying network.

Pages: 349 to 354

Copyright: Copyright (c) IARIA, 2012

Publication date: June 24, 2012

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-203-5

Location: Venice, Italy

Dates: from June 24, 2012 to June 29, 2012