Iv. CHARACTERIZA’I’1ON OF MOBILE SATELLITE COMMUNICATIONS CHANNELS IN THE PRESENCE OF ROADSIDE BLOCKAGE WHEN INTERLEAVING AND FEC CODING ARE IMPLEMENTED

1. INTRODUCTION This paper presents the view point of a system engineer regarding the format of propagation information and models suitable for the design of mobile and portable satellite communications systems for the following services: auclio broadcast, two way voice, and packet data. The propagation experiments conducted by the University of Texas [1] for the NASA/VOA DBS-R Program have provided critical information on l'he overall signal attenuation into buildings and the variation of such attenuation with frequency, '1'he fine signal structure (spatial. and spectral) inside buildings. However these measurements have the following limitations:. Measurements were conducted over the 0.75 to 1.8 GHz and the results extrapolated to 3.0 GHz, it would be very useful to extend the measurements to 3.0 GHZ.. Measurements were conducted using a low gain antenna, corresponding information regarding moderate gain antennas (6-12 dBic) is needed.. Measurements were conducted using a transmitter atop a mast to simulate the satellite signal, validation using a satellite signal. is needed.. Measurements were conducted inside a few buildings, a larger database is required to define the morphological characteristics for indoor satellite reception in various types of buildings around the world.