05022024 is referenced by 229 patents and cites 21 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
713925
Publication Number
5022024
Application Date
May 8, 1989
Publication Date
June 4, 1991
Inventor
Graham M Avis
San Diego
CA, US
Steven A Morley
San Diego
CA, US
Mark J Handzel
San Diego
CA, US
Eric Paneth
Givataijm
IL
Agent
C Frederick Koenig III
Anthony S Volpe
Arthur A Jacobs
Assignee
International Mobile Machines Corporation
PA, US
IPC
H04J 4/00
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