Joint de-spreading and frequency correction using a correlator
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United States of America Patent
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Feb 15, 2011
Grant Date -
Aug 28, 2008
app pub date -
Feb 23, 2007
filing date -
Feb 23, 2007
priority date (Note) -
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Abstract
A correlator (140) for de-spreading a spread-spectrum signal includes a state machine (205), a frequency correction look-up table (207), a pseudorandom code generator (209), and a correlator structure (301 and 801). The spread-spectrum signal includes symbols, and each symbol includes a plurality of chips. The correlator structure includes a plurality of taps (309 and 809) at which a coordinate rotation digital computer (CORDIC) operation is performed to determine an offset from a nominal carrier frequency of the spread-spectrum signal and to change a phase of each chip of a received symbol, in order to correct a carrier frequency of the spread-spectrum signal while de-spreading the spread-spectrum signal.
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