1,721,130 research outputs found
The scattering function of the mobile radio channel in the presence of three-dimensional diffuse multipath
No full textThe paper provides analytical expressions for the scattering function of the mobile radio channel modelled as a WSSUS channel, in the presence of 3-D diffuse multipath. In particular, the paper concentrates on the Doppler spectrum in both cases of mobile-to-radio base and of mobile-to-mobile radio link. When only one terminal is non stationary in an urban environment, and is equipped with a half-wave dipole antenna, the Doppler spectrum presents two peaks going to infinity at v = f fd (max Doppler shift), contrary to what is generally deemed for a 3-D multipath scenario and similarly to the classical 2-D behaviour
Statistical channel modelling and performance evaluation in satellite personal communications
No full textThis paper is concerned with channel modelling for satellite personal communications and with the associated problem of performance evaluation. Channel characteristics for personal communications tend to differ from those traditionally accepted for vehicular communications. In this paper we report on modelling aspects for both wideband and narrowband personal communications. Then we consider performance evaluation for low-altitude earth orbit (LEO) satellite systems in terms of bit error probability and outage probability. To evaluate the outage probability for LEO systems, a tight and simple upper bound is finally provided. © 1998 John Wiley & Sons, Ltd
Generalised rice-lognormal channel model for wireless communications
No full textThe Rice-lognormal (RLN) channel model is generalised to include an additive diffuse-multipath component having constant average power. The generalised RLN (GRLN) model includes as limiting cases many well-known narrowband models, e.g. Rayleigh, Rice, lognormal and Loo. The GRLN probability density functions of both envelope and phase are evaluate
A satellite system for multimedia personal communications at Ka-band and beyond
No full textThe main characteristics of the satellite extremely high frequency (EHF) communication of multimedia mobile services (SECOMS) system are given and the results of the preliminary analysis are included. The SECOMS provides a first generation Ka band system with coverage over Western Europe, in order to satisfy business user needs of very large bandwidths and terminal mobility. The satellite system also provides a second generation EHF enhanced system with increased capacity and enlarged coverage, to serve all of Europe and the nearby countries
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