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64 IEEE COMMUNICATIONS LETTERS, VOL. 6, NO. 2, FEBRUARY 2002 Turbo Codes for Nonuniform Memoryless Sources
 

Summary: 64 IEEE COMMUNICATIONS LETTERS, VOL. 6, NO. 2, FEBRUARY 2002
Turbo Codes for Nonuniform Memoryless Sources
Over Noisy Channels
Guang-Chong Zhu and Fady Alajaji, Senior Member, IEEE
Abstract--This work addresses the problem of designing Turbo
codes for nonuniform binary memoryless or independent and
identically distributed (i.i.d.) sources over noisy channels. The
extrinsic information in the decoder is modified to exploit the
source redundancy in the form of nonuniformity; furthermore,
the constituent encoder structure is optimized for the considered
nonuniform i.i.d. source to further enhance the system perfor-
mance. Some constituent encoders are found to substantially
outperform Berrou's (37, 21) encoder. Indeed, it is shown that the
bit error rate (BER) performance of the newly designed Turbo
codes is greatly improved as significant coding gains are obtained.
Index Terms--AWGN and Rayleigh channels, joint
source-channel coding, nonuniform i.i.d. sources, turbo codes.
I. INTRODUCTION
IN CHANNEL coding, the source is usually assumed to be a
binary memoryless Bernoulli (1/2) source, i.e., it generates

  

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

 

Collections: Engineering