Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Patent
1993-04-22
1997-11-11
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
370330, 370436, 370478, 455 331, 379 59, H04J 400, H04L 2718, H04Q 730
Patent
active
056871945
ABSTRACT:
A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division circuits is determined by the transmission quality of the signals. The base station is interconnected with an external information network, which may be analog and/or digital. The information signals are selected from the group consisting of voice, data, facsimile, video, computer and instrumentation signals. The modulation level of the signals and the power applied to the system are adjusted in accordance with signal error detection in the system. The system is provided with spatial diversity by using a plurality of antennas selectively spaced from each other to provide relatively high signal reception despite signal fading. The base station operates over a plurality of RF channel pairs. Each channel pair operation is implemented by the combination of a transmit channel circuit for processing a given plural number of information signals received simultaneously over telephone company trunk lines for simultaneous transmission to different subscriber stations over a given RF channel, and a receive channel circuit for processing a plurality of signals received simultaneously over a given RF channel from different subscriber stations to provide information signals for transmission over the trunk lines.
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Avis Graham M.
Handzel Mark J.
Morley Steven Allan
Paneth Eric
Chin Stephen
Gluck Jeffrey W.
InterDigital Technology Corporation
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