04979170 is referenced by 182 patents and cites 23 patents.

A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver for transmitting a first communication signal to one or more mobile terminals and at least one mobile terminal having a second transceiver for receiving the first communication signal and demodulating it, and for transmitting at a predetermined duty cycle of the second transceiver, a second communication signal to at least one of the central communication stations. The preferred duty cycle over which the second communication signal is transmitted is about fifty percent of the second transceiver duty cycle. The communication system uses Time Division Multiplexed (TDM) communication signals using a number of channels as designated address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by terminals to determine both the presence of a message and its corresponding data transmission or reception channel. In addition the terminals use the reception of the first communication signal to adjust return link transmission frequency to compensate for transmission path errors. The alternating duty cycle allows mobile terminals to use a single set of local oscillators for both transmission and reception modes of operation. To decrease interference with other systems the present system employs a power dispersal modulation function to achieve the footprint of a video signal for high transfer rate digital communication signals.

Title
Alternating sequential half duplex communication system
Application Number
7/145176
Publication Number
4979170
Application Date
January 19, 1988
Publication Date
December 18, 1990
Inventor
Lindsay A Weaver Jr
San Diego
CA, US
Irwin M Jacobs
La Jolla
CA, US
Franklin P Antonio
Del Mar
CA, US
Klein S Gilhousen
San Diego
CA, US
Agent
Russell B Miller
Assignee
Qualcomm
CA, US
IPC
H04B 7/216
H04B 7/212
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