Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-06-13
1995-12-26
Boudreau, Leo H.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359172, 359152, H04B 1000
Patent
active
054795958
ABSTRACT:
A mobile telephony system intended for use by outdoor subscribers, for instance in cars, while affording, at the same time, high traffic capacity and relatively disturbance-free speech transmission to subscribers located within a building, for instance an office building. Signal transmission between mobile stations (MS, MSI) and base stations (BS1, BSI) is effected with radio waves in a first part-system (7), for instance intended for telephony traffic via car telephones, and with light, at least in the area nearest the mobile stations (MSI), in a second part-system (6) intended, for instance, for an office building. Signal transmission with light can also be effected in areas that contain electronic apparatus which is sensitive to radio disturbances, for instance in hospitals and/or in areas in which strong radio disturbances capable of preventing mobile telephony transmission with radio waves occur. Certain mobile stations may be capable of being switched between signal transmission with radio waves and signal transmission with light, which enables these stations to be used in both part-systems (7, 6).
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G. Feller, Infrared Microbroadcasting Network for In-House Data Communication, 1982.
PCT International-Type Search Report issued in connection with corresponding Swedish Patent Application No. 9002244-3, date Jun. 25, 1990.
Bacares Rafael
Boudreau Leo H.
Telefonaktiebolaget LM Ericsson
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