As submitted in project proposal

In a mobile communication environment the channel is not time invariant and is slowly varying. This characteristic feature of the channel leads to a phenomenon called Fading. Fading channels induce rapid amplitude fluctuations in the received signal. If they are not compensated for then this will lead to serious performance degradation. In this paper simulations have been conducted to study the...

This paper provides a brief introduction to the various types of Diversity systems in wireless systems. Stepping into the new generation of mobile communication it is of concern to increase the performance of the mobile terminals and their antennas to be able to answer to the demand of faster and more various communicational services. Still, the issue of signal fading in a multi-path environmen...

The propagation of seismic waves in an open borehole is reviewed. The principal wave types are the refracted P and S waves and the two guided waves pseudo-Rayleigh and Stoneley. The dispersion properties of the gUided waves are analyzed. An efficient method of computing synthetic microseismograms is described. The relative effects of the borehole. fluid and formation properties on the propagati...

This paper proposes an analytical study that aims at evaluating the power-control error statistics in wireless direct-sequence code-division multiple-access (DS-CDMA) cellular systems based on an ideal variable step closed-loop power-control scheme. In particular, the cumulative distribution function and the correlation coefficient of the power control error are derived through a first-order Ta...

The purpose of this paper is to propose a simple (one or two parameter) multiphase flow model, suitable for the description of Rayleigh–Taylor and Richtmyer–Meshkov mixing layers. We justify model closure assumptions in this model by comparison to Rayleigh–Taylor and Richtmyer–Meshkov simulation data. We show that the relative errors related tomodel closure terms are about 10%, and are about tw...

This paper presents an experimental study devoted to the understanding of break-up mechanisms of liquid sheets. A shear instability develops at the interface liquid/gas resulting in an undulated motion of the liquid sheet. These undulations trig a Rayleigh-Taylor instability leading to azimuthal thickness modulations. A model including the development of both instabilities allows us to predict ...

This paper presents new envelope probability density functions (pdfs) that describe small-scale, local area fading experienced by narrow-band wireless receivers. The paper also develops novel pdfs that describe the local area fading of two specular multipath components in the presence of other diffusely propagating waves. These pdfs are studied in the context of classical fading pdfs such as th...