Code synchronization in CDMA satellite wireless communications system using uplink channel detection
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United States of America Patent
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Nov 18, 2008
Grant Date -
Sep 15, 2005
app pub date -
Feb 25, 2005
filing date -
Mar 9, 2004
priority date (Note) -
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status (Latency Note)
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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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