Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1992-09-04
1995-06-06
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 511, 455 671, 455 677, H04B 726, H04B 1700
Patent
active
054230675
ABSTRACT:
A digital mobile communications system which maintains synchronization among sending data of base stations, measures the time delay of radio waves from mobile stations under control at the control base station and instructs the value of time delay to each mobile station to adjust the timing of sending data of mobile stations to establish synchronization of communications between the base station and the mobile stations, wherein the system comprises means for measuring at mobile stations relative time delays of radio waves from at least one base station other than the control base station with respect to the radio waves from the control base station and periodically reporting the relative time delays to the control base station, and means for calculating at the base station the distances between the mobile station and the base stations and further determining the current geographic positions of the mobile station.
REFERENCES:
patent: 4651157 (1987-03-01), Gray et al.
patent: 5128925 (1992-07-01), Dornstetter et al.
Eisenzopf Reinhard J.
NEC Corporation
Pham Chi H.
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