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IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 57, NO. 4, APRIL 2009 997 Hybrid Digital-Analog Coding with Bandwidth
 

Summary: IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 57, NO. 4, APRIL 2009 997
Hybrid Digital-Analog Coding with Bandwidth
Compression for Gaussian Source-Channel Pairs
Yadong Wang, Fady Alajaji, Senior Member, IEEE, and Tamás Linder, Senior Member, IEEE
Abstract--Three hybrid digital-analog (HDA) systems, denoted
by HDA-I, HDA
and HDA-II, for the coding of a memory-
less discrete-time Gaussian source over a discrete-time additive
memoryless Gaussian channel under bandwidth compression are
studied. The systems employ simple linear coding in their analog
component and superimpose their analog and digital signals
before channel transmission. Information-theoretic upper bounds
on the asymptotically optimal mean squared error distortion of
the systems are obtained under both matched and mismatched
channel conditions. Allocation schemes for distributing the chan-
nel input power between the analog and the digital signals are
also examined. It is shown that systems HDA
and HDA-II can
asymptotically achieve the optimal Shannon-limit performance
under matched channel conditions. Low-complexity and low-

  

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