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Summary: A Discrete Queue-Based Model for Soft-Decision
Demodulated Correlated Fading Channels
Cecilio Pimentel, Fady Alajaji, Pedro Melo
Department of Electronics and Systems, Federal University of Pernambuco
Recife, PE, 50711-970, Brazil Email: cecilio@ufpe.br, pmelo@hotmail.com
Department of Mathematics and Statistics, Queen's University
Kingston, ON K7L 3N6, Canada Email: fady@mast.queensu.ca
Abstract--A discrete fading channel (DFC) consisting of a
binary modulated time-correlated Rayleigh fading channel used
in conjunction with coherent soft-decision demodulation of res-
olution q is considered. The capacity of the binary input 2q
-ary
output DFC, which can be explicitly expressed in terms of a
non-binary noise discrete channel with stationary ergodic 2q
-ary
noise, is evaluated in terms of q and the fading parameters. It
is observed that considerable capacity gains can be achieved due
to the channel's statistical memory and the use of as few as
2 bits for soft-decision over interleaving the channel (to render
it memoryless) and hard-decision demodulation (q = 1). The
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