Summary: IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 52, NO. 8, AUGUST 2006 3757
Hybrid Digital­Analog Source­Channel Coding for
Bandwidth Compression/Expansion
Mikael Skoglund, Senior Member, IEEE,
Nam Phamdo, Senior Member, IEEE, and
Fady Alajaji, Senior Member, IEEE
Abstract--An approach to hybrid digital­analog (HDA) source­channel
coding for the communication of analog sources over memoryless Gaussian
channels is introduced. The HDA system, which exploits the advantages of
both digital and analog systems, generalizes a scheme previously presented
by the authors, and can operate for any bandwidth ratio (bandwidth com-
pression and expansion). It is based on vector quantization and features
turbo coding in its digital component and linear/nonlinear processing in its
analog part. Simulations illustrate that, under both bandwidth compres-
sion and expansion modes of operation, the HDA system provides a robust
and graceful performance with good reproduction fidelity for a wide range
of channel conditions.
Index Terms--Additive white Gaussian noise (AWGN) channels, broad-
casting, Gaussian sources, hybrid digital­analog coding, robust coding,
source­channel coding, turbo codes, vector quantization.

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

Collections: Engineering