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IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 48, NO. 9, SEPTEMBER 2000 1499 Soft-Decision Demodulation Design for COVQ over
 

Summary: IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 48, NO. 9, SEPTEMBER 2000 1499
Soft-Decision Demodulation Design for COVQ over
White, Colored, and ISI Gaussian Channels
Nam Phamdo, Senior Member, IEEE, and Fady Alajaji, Senior Member, IEEE
Abstract--In this work, the design of a -bit (scalar and vector)
soft-decision demodulator for Gaussian channels with binary
phase-shift keying modulation is investigated. The demodulator is
used in conjunction with a soft-decision channel-optimized vector
quantization (COVQ) system. The COVQ is constructed for an
expanded ( 1) discrete channel consisting of the concatenation
of the modulator, the Gaussian channel, and the demodulator.
It is found that as the demodulator resolution increases, the
capacity of the expanded channel increases, resulting in an
improvement of the COVQ performance. Consequently, the
soft-decision demodulator is designed to maximize the capacity
of the expanded channel. Three Gaussian channel models are
considered as follows: 1) additive white Gaussian noise channels;
2) additive colored Gaussian noise channels; and 3) Gaussian
channels with intersymbol interference. Comparisons are made
with a) hard-decision COVQ systems, b) COVQ systems which

  

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

 

Collections: Engineering