Apparatus for reducing auto-correlation or cross-correlation in weak CDMA signals
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United States of America Patent
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Mar 27, 2007
Grant Date -
Feb 28, 2002
app pub date -
Jul 20, 2001
filing date -
Aug 24, 2000
priority date (Note) -
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Abstract
The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel data paths that allow standard correlation of signals in parallel with verification of the lock signal to determine whether the system has locked onto the proper signal within the scanned signal window. The invention can be made with multiple CPUs, a single CPU with dual input modes, on multiple IC chips, or as a single IC chip solution for small, low cost reception, downconversion, correlation, and verification systems.
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