Title :
Soft-decision COVQ for Rayleigh-fading channels
Author :
Alajaji, Fady I. ; Phamdo, Nam C.
Author_Institution :
Dept. of Math. & Stat., Queen´´s Univ., Kingston, Ont., Canada
fDate :
6/1/1998 12:00:00 AM
Abstract :
A channel-optimized vector quantizer (COVQ) scheme that exploits the channel soft-decision information is proposed. The scheme is designed for stationary memoryless Gaussian and Gauss-Markov sources transmitted over BPSK-modulated Rayleigh-fading channels. It is demonstrated that substantial coding gains of 2-3 dB in channel signal-to-noise ratio (SNR) and 1-1.5 dB in source signal-to-distortion ratio (SDR) can be achieved over COVQ systems designed for discrete (hard-decision demodulated) channels.
Keywords :
Gaussian processes; Markov processes; Rayleigh channels; channel coding; decoding; fading; memoryless systems; phase shift keying; rate distortion theory; source coding; vector quantisation; 1 to 1.5 dB; 2 to 3 dB; BPSK modulation; COVQ; Gauss-Markov sources; Rayleigh fading channels; SDR; SNR; channel signal-to-noise ratio; channel-optimized vector quantizer; coding gains; combined source-channel coding; soft-decision decoding; soft-decision information; source signal-to-distortion ratio; stationary memoryless Gaussian sources; Binary phase shift keying; Communication channels; Decoding; Demodulation; Gain; Gaussian channels; Phase shift keying; Rayleigh channels; Signal design; Signal to noise ratio;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.681359
