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A new class of channel models with memory is presented in order to study various kinds of interference phenomena. It is shown, among other things, that when all other parameters are held fixed, channel capacity C is an increasing function of the memory length, while the cutoff rate R₀ generally is a decreasing function. Calculations with various explicit coding schemes indicate that C is better than R₀ as a performance measure for these channel models. As a partial resolution of this C versus R₀ paradox, the conjecture is offered that R₀ is more properly a measure of coding delay rather than of coding complexity.
McEliece et al. (Sun,) studied this question.
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