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708 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 48, NO. 3, MARCH 2002 Design and Performance of VQ-Based Hybrid
 

Summary: 708 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 48, NO. 3, MARCH 2002
Design and Performance of VQ-Based Hybrid
Digital­Analog Joint Source­Channel Codes
Mikael Skoglund, Member, IEEE, Nam Phamdo, Senior Member, IEEE, and Fady Alajaji, Senior Member, IEEE
Abstract--A joint source­channel hybrid digital­analog (HDA)
vector quantization (VQ) system is presented. The main advan-
tage of the new VQ-based HDA system is that it achieves excellent
rate-distortion-capacity performance at the design signal-to-noise
ratio (SNR) while maintaining a "graceful improvement" charac-
teristic at higher SNRs. It is demonstrated that, within the HDA
framework, the parameters of the system can be optimized using
an iterative procedure similar to that of channel-optimized vector
quantizer design. Comparisons are made with three purely dig-
ital systems and one purely analog system. It is found that, at high
SNRs, the VQ-based HDA system is superior to the other investi-
gated systems. At low SNRs, the performance of the new scheme
can be improved using the optimization procedure and using soft
decoding in the digital part of the system. These results demon-
strate that the introduced scheme provides an attractive method
for terrestrial broadcasting applications.

  

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

 

Collections: Engineering