Some Features of Radio-Spectral Diagnostics of Random Media via PM and PRM Oscillations

Abstract

Due to the development of satellite, mobile, cellular, and optical telecommunication systems, a special attention is paid to broad band frequency signals, like signals with wide spectrum, when frequency band of the transmitting signal may be wider than frequency band of the transmitted signal itself. For many telecommunication systems, the ability of transmitting information to several users simultaneously via one and the same channel is very important. A number of methods are applied for this purpose, for instance: the frequency modulation (FM) of the carrier signal (the method of frequency division of transmitting channel), phase modulation (PM) of the carrier signal or pseudo-random modulation (PRM) of the carrier signal. In the conditions of increasing demands on communication systems, the question of creating multi-user systems became very actual. In all cases it is necessary to provide high quality connection on longer distance so that the universal standards should not be violated.