Summary: IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 54, NO. 10, OCTOBER 2006 3935
Channel-Optimized Quantization With Soft-Decision
Demodulation for Space­Time Orthogonal
Block-Coded Channels
Firouz Behnamfar, Member, IEEE, Fady Alajaji, Senior Member, IEEE, and Tamás Linder, Senior Member, IEEE
Abstract--We introduce three soft-decision demodulation
channel-optimized vector quantizers (COVQs) to transmit analog
sources over space­time orthogonal block (STOB)-coded flat
Rayleigh fading channels with binary phase-shift keying (BPSK)
modulation. One main objective is to judiciously utilize the soft
information of the STOB-coded channel in the design of the
vector quantizers while keeping a low system complexity. To
meet this objective, we introduce a simple space­time decoding
structure that consists of a space­time soft detector, followed by
a linear combiner and a scalar uniform quantizer with resolu-
tion . The concatenation of the space­time encoder/modulator,
fading channel, and space­time receiver can be described by a
binary-input, 2 -output discrete memoryless channel (DMC).
The scalar uniform quantizer is chosen so that the capacity of
the equivalent DMC is maximized to fully exploit and capture

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

Collections: Engineering