Abstract :
Following a brief prologue and historical overview, such technical issues as the repertoire of systems and services, management of the airwaves, the operating environment, service quality, network issues and cell size, channel coding and modulation, speech coding, diversity, multiplex, and multiple access (FDMA, TDMA, CDMA) are discussed. Also addressed are the potential economic and sociological impacts of mobile radio communications in the wake of the redistribution of airwaves at the World Administrative Radio Conference WARC ´92. Performance dependence on multipath delay (related to the cell size and terrain configuration), Doppler frequency (related to the carrier frequency, data rate. and the speed of vehicles), and message length (may dictate the choice of multiple access) is briefly discussed.<>
Keywords :
cellular radio; cordless telephone systems; diversity reception; economic and sociologic effects; encoding; frequency allocation; mobile radio systems; modulation; multi-access systems; satellite relay systems; CDMA; Doppler frequency; FDMA; TDMA; airwaves management; cell size; channel coding; cordless telephony; diversity; economic impacts; historical overview; message length; mobile radio communications; mobile satellite communication; modulation; multipath delay; multiple access; multiplex; network issues; operating environment; service quality; sociological impacts; speech coding; Channel coding; Cultural differences; Environmental management; Frequency division multiaccess; Land mobile radio; Modulation coding; Multiaccess communication; Quality management; Speech coding; Time division multiple access;
