Multiplex communications – Communication over free space – Repeater
Patent
1996-08-28
1998-11-17
Patel, Ajit
Multiplex communications
Communication over free space
Repeater
370519, H04J 306
Patent
active
058386696
ABSTRACT:
Synchronization of a terrestrial transmitted CDMA signal with despreading and respreading in a remote satellite, for transmission to a second terrestrial site, is achieved in accord with the processes recited in the appended claims. Uplink access and synchronization signals are acquired at a satellite switch and a reference propagation delay time is established in terms of quantified timing marks with intervals within a size range of chip intervals used in the CDMA spreading codes of the system. The propagation delay is defined in terms of one of the quantified timing marks defining when a first signal from a terrestrial subscriber unit is received. This propagation delay is transmitted to a terrestrial subscriber unit and utilized to adjust the timing of uplink CDMA code chips.
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AT&T Corp.
Patel Ajit
Steinmetz Alfred G.
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