Summary: Performance of COVQ over AWGN/Rayleigh Channels
with Soft­Decision BPSK Modulation y
Nam Phamdo ? and Fady Alajaji z
? Department of Electrical Engineering
State University of New York at Stony Brook, Stony Brook, NY 11794­2350
z Department of Mathematics and Statistics
Queen's University, Kingston, Ontario K7L 3N6, Canada
ABSTRACT
A channel­optimized vector quantizer (COVQ) scheme
that exploits the channel soft­decision information is pro­
posed. The scheme is designed for stationary memory­
less Gaussian and Gauss­Markov sources transmitted over
BPSK­modulated additive white Gaussian noise (AWGN)
or Rayleigh fading channels. It is demonstrated that cod­
ing gains of up to 2 dB can be achieved at low channel
signal­to­noise ratios over COVQ systems designed for dis­
crete (hard­decision demodulated) channels. Finally, this
scheme is compared with the soft Hadamard column de­
coder of Skoglund and Hedelin.
1. INTRODUCTION

Source: Alajaji, Fady - Department of Mathematics and Statistics, Queen's University (Kingston)

Collections: Engineering