Fernando Pérez-Fontán

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In this paper, a statistical model for the land mobile satellite (LMS) channel is presented. The model is capable of describing both narrowand wide-band conditions. Other relevant characteristic is that it can be used to study links with geostationary as well as nongeostationary satellites. The model is of the generative type, i.e., it is capable of(More)
The land mobile satellite (LMS) propagation channel is frequently described using statistical models. These models usually make different assumptions regarding the behavior of the direct signal, the diffuse multipath component and the shadowing effects. This paper analyzes the theoretical formulation and implementation of time-series synthesizers based on(More)
This paper reviews the state of the art and current trends towards 3G and 3GC mobile satellite systems that are being planned in parallel or within the International Mobile Telecommunications (IMT-2000) framework. The subject is firstly approached by introducing the key and enabling technologies both for satellites and high altitude platform stations. After(More)
Retractile mesenteritis is a rare disorder characterized by either focal or diffuse thickening of the mesentery due to chronic inflammation and fibrosis. Six cases are reported in which stenosis of the colon, an uncommon complication of retractile mesenteritis, was the predominant radiologic finding. Diagnosis was suggested by the tapered, serrated(More)