Abstract This study provides a systematic comparative analysis of seven common cross-national measures state capacity by focusing on three measurement issues: convergent validity, interchangeability, and case-specific disagreement. The author finds that the validity is high, but interchangeability low. means even highly correlated can lead to completely different statistical inferences. cause t...

Doubly-selective wireless communication channels, i.e., those with significant selectivity in both time and frequency domains, arise in applications operating over wide bandwidths, at high carrier frequencies, and under high mobility conditions. Many systems designed to communicate over such channels are OFDMbased and employ large block lengths to combat capacity loss resulting from the use of ...

This paper introduces the concept of equivalent channel for mutual information performance analysis of multiplesymbol differential MPSK (M -phase shift keying) over timecorrelated, time-varying flat-fading communication channels. It is proven that differential detection scheme theoretically preserves the channel information capacity when the observation interval approaches infinity. A state spa...

We construct a class of quantum channels in arbitrary dimensions for which entanglement enhances the mutual information. The channels have correlated noise and when the level of correlation passes a critical value we see a sharp transition in the optimal input states, states which maximize the mutual information or minimize the output entropy, from separable states to maximally entangled states...