Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1994-08-11
1995-03-21
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 58, 379 56, 455 331, H04M 1100
Patent
active
054003911
ABSTRACT:
A cellular mobile communication system in which each of one or more cells is provided with a base radio station, and mobile terminals communicate with the base radio stations. Base radio stations (21, 22 and 23) are connected to a central base station (100) by optical fibers. The central base station is connected to a mobile switching center (50). Each of the base radio stations is provided with an O/E converter (201) and E/O converter (207). The O/E converter converts a optical signal containing speech signals and a call connection control signal into RF signals. The E/O converter (207) converts RF signals, received from a mobile terminal (11) via an antenna (204), into optical signals and transmits the optical signals to the central base station. The central base station comprises O/E converters (301-303) for converting optical signals from each base radio station into RF signals; receivers (401-403) for demodulating these RF signals; transmitters (406-408) for converting speech signals and a call connection control signal from the mobile switching center into RF signals; and E/O converters (304-306) for converting these RF signals into optical signals and transmitting the optical signals to a base radio station.
REFERENCES:
patent: 4568800 (1986-02-01), Orikasa
patent: 5103459 (1992-04-01), Gilhousen et al.
39th IEEE Vehicular Technology Conference, vol. 1, May 1, 1989, San Francisco, pp. 398-400, L. J. Meyer, "Using Fiber Optics with Analog R.F. Signals".
Emura Katsumi
Kanai Toshihito
Namiki Junji
Shibutani Makoto
Kuntz Curtis
NEC Corporation
Oehling G. J.
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