Entropy and Telecommunications Systems

Entropy of infinite systems and transformations

The Kolmogorov-Sinai entropy is a far reaching dynamical generalization of Shannon entropy of information systems. This entropy works perfectly for probability measure preserving (p.m.p.) transformations. However, it is not useful when there is no finite invariant measure. There are certain successful extensions of the notion of entropy to infinite measure spaces, or transformations with ...

Entropy operator for continuous dynamical systems of finite topological entropy

In this paper we introduce the concept of entropy operator for continuous systems of finite topological entropy. It is shown that it generates the Kolmogorov entropy as a special case. If $phi$ is invertible then the entropy operator is bounded with the topological entropy of $phi$ as its norm.

Future Mobile Telecommunications Systems

In this paper, we review 2nd and 3rd generation wireless telephony systems, both in terms of technology and service concepts. We point out some of the technical and service issues that may a ect the functionality and performance from the user point of view. In particular, we focus on one technical and one service concept important for long term success of 3rd generation systems: transmit divers...

Circuits and Systems for Radiofrequency and Telecommunications

Fuel Cell Systems for Telecommunications

Standalone power systems for telecommunications are becoming an emergent need, due to environmental problems and their current tendency to be localized in remote places. Along with photovoltaic and wind generators, fuel cells are one of the most mature technologies to be employed in this kind of systems. As they are expensive and complex systems, it is important to simulate their behaviour to s...