Universal channel coding for general output alphabet

TL;DR

This paper introduces two universal channel coding schemes suitable for channels with possibly continuous output alphabets, analyzing their error decay and capacity approximation using information spectrum and type methods.

Contribution

It presents novel universal coding strategies for general output alphabets, providing explicit error bounds and capacity approximations with second-order analysis.

Findings

Error probability decays exponentially with explicit bounds

Achieves epsilon-capacity with second-order term characterization

Unified analysis for discrete and continuous output channels

Abstract

We propose two types of universal codes that are suited to two asymptotic regimes when the output alphabet is possibly continuous. The first class has the property that the error probability decays exponentially fast and we identify an explicit lower bound on the error exponent. The other class attains the epsilon-capacity the channel and we also identify the second-order term in the asymptotic expansion. The proposed encoder is essentially based on the packing lemma of the method of types. For the decoder, we first derive a R\'enyi-relative-entropy version of Clarke and Barron's formula the distance between the true distribution and the Bayesian mixture, which is of independent interest. The universal decoder is stated in terms of this formula and quantities used in the information spectrum method. The methods contained herein allow us to analyze universal codes for channels with continuous and discrete output alphabets in a unified manner, and to analyze their performances in terms of the exponential decay of the error probability and the second-order coding rate.