DocumentCode :
3499604
Title :
Exploiting memory and soft-decision information in channel optimized quantization for correlated fading channels
Author :
Shahidi, Shervin ; Alajaji, Fady ; Linder, Tamás
Author_Institution :
Dept. of Electr. & Comput. Eng., Queen´´s Univ., Kingston, ON, Canada
fYear :
2011
fDate :
17-20 May 2011
Firstpage :
66
Lastpage :
69
Abstract :
A channel optimized vector quantizer (COVQ) scheme is studied and evaluated for a recently introduced discrete binary-input 2q-ary-output channel with Markovian ergodic noise based on a finite queue. This channel can effectively model binary-modulated correlated Rayleigh fading channels with output quantization of resolution q. It is shown that the system can successfully exploit the channel´s memory and soft-decision information. Signal-to-distortion gains of up to 2.3 dB are obtained for only 2 bits of soft-decision quantization over COVQ schemes designed for a hard-decision (q = 1) demodulated channel. Furthermore, gains as high as 4.6 dB can be achieved for a highly correlated channel, in comparison with systems designed for the ideally interleaved (memoryless) channel. Finally, the queue-based noise model is validated as an effective approximation of correlated fading channels by testing a COVQ trained using this model over the Rayleigh fading channel.
Keywords :
Rayleigh channels; queueing theory; vector quantisation; Markovian ergodic noise; binary-modulated correlated Rayleigh fading channels; channel memory; channel optimized quantization; channel optimized vector quantizer; correlated fading channels; discrete binary-input 2q-ary-output channel; effective approximation; finite queue; hard-decision demodulated channel; highly correlated channel; ideally interleaved memoryless channel; queue-based noise model; signal-to-distortion; soft-decision information; soft-decision quantization; word length 2 bit; Channel coding; Channel models; Fading; Numerical models; Signal to noise ratio; Training;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory (CWIT), 2011 12th Canadian Workshop on
Conference_Location :
Kelowna, BC
Print_ISBN :
978-1-4577-0743-8
Type :
conf
DOI :
10.1109/CWIT.2011.5872125
Filename :
5872125
Link To Document :
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