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Hybrid Digital-Analog Source-Channel Coding with One-to-Three Bandwidth Expansion

Summary: Hybrid Digital-Analog Source-Channel Coding with
One-to-Three Bandwidth Expansion
Ahmad Abou Saleh, Fady Alajaji, and Wai-Yip Chan
Abstract--We consider the problem of bandwidth expansion
for lossy joint source-channel coding over a memoryless Gaussian
channel. A low delay 1:3 bandwidth expansion hybrid digital-
analog coding system, which combines a scalar quantizer and
a 1:2 nonlinear analog coder, is proposed. It is shown that
our proposed system outperforms the 1:3 generalized hybrid
scalar quantizer linear coder in terms of signal-to-distortion ratio
(SDR). A lower bound on the system SDR is also derived.
The traditional approach for analog source transmission
is to use separate source and channel coders. This separa-
tion is optimal given infinite delay and complexity in the
coders [1]. In practice, joint source-channel coding (JSCC)
can achieve better performance when delay and complexity are
constrained. A common approach for JSCC design is to jointly
optimize the components of a tandem system with respect to
the channel and source characteristics. Another approach based


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


Collections: Engineering