The arguable contribution of the odd-even constraint—as an interleaver design criterion—to the performance of turbo trellis-coded modulation is revisited. The question that arises from the literature, remaining still unaddressed, is whether the constraint reduces interleaver gain. In this work, we answer this question in the negative. Moreover, we empirically show and analytically explain that the constraint possesses a spectral-thinning property.
['Konstantinos S. Arkoudogiannis', 'Christos E. Dimakis', 'Konstantinos V. Koutsouvelis']
Turbo trellis-coded modulation: A weight spectrum view at the odd-even constraint