Turbo codes with non-uniform constellations

  title={Turbo codes with non-uniform constellations},
  author={Christina Fragouli and Richard D. Wesel and Dirk Sommer and Gerhard P. Fettweis},
Absrract-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… CONTINUE READING
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