Turbo Codes with Non-Uniform Constellation

Turbo Codes with Non-Uniform Constellation. Fragouli, C., Wesel, R. D., Sommer, D., & Fettweis, G. P. ICC 2001, Helsinki, Finland, vol. 1:pages 70–73, 2001.
abstract bibtex

This paper presents parallel concatenated turbo codes that employ a non-uniform constellation to achieve shaping gain. The output signal approximates the Gaussian distribution by using equally likely signals with unequal spacing (a non-uniform constellation). The small distance of points near the center of the constellation may lead to a small overall free distance and thus a high error floor for turbo codes. We avoid this situation by a two-step design procedure, that first creates an interleaver, and then identifies the constituent encoders that maximize the turbo code free distance. Simulation results for 4 bits/sec/Hz show that this use of shaping can offer an improvement of approximately 0.2 dB for turbo codes.

@article{fragouli_turbo_2001-1,
 abstract = {This paper presents parallel concatenated turbo codes that employ a non-uniform constellation to achieve shaping gain. The output signal approximates the Gaussian distribution by using equally likely signals with unequal spacing (a non-uniform constellation). The small distance of points near the center of the constellation may lead to a small overall free distance and thus a high error floor for turbo codes. We avoid this situation by a two-step design procedure, that first creates an interleaver, and then identifies the constituent encoders that maximize the turbo code free distance. Simulation results for 4 bits/sec/Hz show that this use of shaping can offer an improvement of approximately 0.2 dB for turbo codes.},
 type={4},
 author = {Fragouli, C. and Wesel, R. D. and Sommer, D. and Fettweis, G. P.},
 journal = {ICC 2001, Helsinki, Finland},
 pages = {pages 70--73},
 tags = {channel_coding},
 title = {Turbo {Codes} with {Non}-{Uniform} {Constellation}},
 volume = {vol. 1},
 year = {2001}
}

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