Channel Reliability Metrics for Flat Rayleigh Fading Channels Without Channel State Information

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Asri Shaheem, Hans-Jürgen Zepernick, Manora Caldera
Title: Channel Reliability Metrics for Flat Rayleigh Fading Channels Without Channel State Information
Conference name: IEEE Symposium on Trends in Communications
Year: 2004
Pagination: 58-61
Publisher: IEEE
City: Bratislava, Slovakia
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (*** Error ***)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Authors e-mail: shaheema@watri.org.au, hans-jurgen.zepernick@bth.se, caldera@watri.org.au
Language: English
Abstract: In this paper, iterative decoding of block turbo codes
(BTCs) over flat Rayleigh fading channels is considered. The
signal is modulated using binary phase shift keying (BPSK) and
coherently detected. An exact channel reliability metric that
should be passed to the iterative decoder to achieve optimum
performance, when no channel state information (CSI) is available
at the receiver, is developed. A low complexity cubic
approximation to the exact metric, which has no performance loss,
is presented. The numerical results obtained using (10,9)^2
single parity check (SPC) BTC, show that the conventional
approach, which uses a linear approximation to the channel
reliability metric, results in a 27dB penalty at BER of
10^-5 compared to the case where perfect CSI is available. On
the other hand, the use of the proposed reliability metric
outperforms the existing metric and results in only a 1.1dB
performance loss at BER of 10^-5 compared to the use of the
metric when the CSI is perfectly known.
Subject: Telecommunications\Coding Theory
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