Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-02-25
2008-11-18
Ha, Dac V (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S145000, C375S149000, C375S367000, C370S515000
Reexamination Certificate
active
07453920
ABSTRACT:
An uplink signal transmitted by a terminal is received by a satellite wireless communications system. The uplink signal includes a known information element, e.g., a reverse access channel (R-ACH) preamble, spread according to a spreading code specific to a component of a satellite wireless communications system, e.g., a pseudonoise (PN) sequence associated with a satellite beam. A correlation of the received uplink signal with the spreading code over a range of time shifts is determined. The known information element is detected from the determined correlation. The satellite wireless communications system is synchronized with the terminal responsive to detection of the known information element. For example, a delay may be assigned to a receiver of the satellite wireless communications system responsive to detection of the known information element.
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ATC Technologies LLC
Ha Dac V
Myers Bigel & Sibley Sajovec, PA
LandOfFree
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