Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-07-31
1984-01-03
Rubinson, G. Z.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455 12, H04M 1100, H04B 719
Patent
active
044244177
ABSTRACT:
In a radiotelephone system comprising a ground central station and a plurality of peripheral stations having access to a geostationary satellite, demand-assignment multiple-access (DAMA) conversations are established by single-span transmission between subscribers of the peripheral stations. In order to prevent conflicts arising from two simultaneous call demands, a rectangular-wave synchronization signal is transmitted by the central station to the peripheral stations in a specialized channel and the demands are caused to coincide with the active wavefronts of the synchronization signal.
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patent: 3564147 (1971-02-01), Puente et al.
patent: 3836721 (1974-09-01), Sugioka
patent: 4273962 (1981-06-01), Wolfe
International Conference on Communications, Jun. 14-16, 1976, Satoh et al., pp. 35-7 to 35-12, "Maritime Satellite Communications Equipment of KDD Experimental System".
National Telecommunications Conference, Dec. 1-3, 1975, Aldrich, pp. 25-13 to 25-16, "An Operational Single-Channel per-Carrier, Demand-Assigned-Multiple-Access Satellite Telephone Network Using Centralized Control".
International Conference on Communications, Jun. 14-16, 1971, Dunn, pp. 11-20 Toll-25 "Telephony to Remote Communities in Canada Via Satellite".
International Conference on Maritime and Aeronautical Satellite Communication and Navigation, Mar. 7-9, 1978, Hoskyns, pp. 52-56, "Multiplexing, Multiple Access and Signalling in the Marots Maritime Mobile Satellite System".
International Conference on Communications, Jun. 10-14, 1979, Shimayama et al., pp. 16.3.1-16.3.8, "FM SCPC System for Various Domestic Satellite Communications Earth Station".
Chavey Christian
Lagoutte Pierre
Brady W. J.
LMT Radio Professionnelle
Rubinson G. Z.
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