04675863 is referenced by 295 patents and cites 8 patents.

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.

Title
Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
Application Number
6/713925
Publication Number
4675863
Application Date
March 20, 1985
Publication Date
June 23, 1987
Inventor
Graham M Avis
San Diego
CA, US
Steven A Morley
San Diego
CA, US
Mark J Handzel
San Diego
CA, US
Eric Paneth
San Diego
CA, US
Agent
Arthur A Jacobs
Assignee
International Mobile Machines
PA, US
IPC
H04J 3/02
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