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IEEE COMMUNICATIONS LETTERS, VOL. 5, NO. 6, JUNE 2001 257 Soft-Decision COVQ for Turbo-Coded AWGN and
 

Summary: IEEE COMMUNICATIONS LETTERS, VOL. 5, NO. 6, JUNE 2001 257
Soft-Decision COVQ for Turbo-Coded AWGN and
Rayleigh Fading Channels
Guang-Chong Zhu and Fady I. Alajaji, Senior Member, IEEE
Abstract--A robust soft-decision channel-optimized vector
quantization (COVQ) scheme for Turbo-coded additive white
Gaussian noise (AWGN) and Rayleigh fading channels is pro-
posed. The log likelihood ratio (LLR) generated by the Turbo
decoder is exploited via the use of a -bit scalar soft-decision
demodulator. The concatenation of the Turbo encoder, modulator,
AWGN channel or Rayleigh fading channel, Turbo decoder,
and -bit soft-decision demodulator is modeled as an expanded
discrete memoryless channel (DMC). A COVQ scheme for this
expanded discrete channel is designed. Numerical results indicate
substantial performance improvements over traditional tandem
coding systems, COVQ schemes designed for hard-decision de-
modulated Turbo-coded channels ( = 1), as well as performance
gains over a recent soft decoding COVQ scheme by Ho.
Index Terms--AWGN channels, channel-optimized vector
quantization, joint source-channel coding, Rayleigh fading chan-

  

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

 

Collections: Engineering