Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 13, 2009
Patent Application Number
10983645
Date Filed
November 9, 2004
Patent Primary Examiner
Patent abstract
A simplified spread spectrum demodulator uses a frequency detector to demodulate a modulated spread spectrum signal to obtain successive chip values. A correlation unit correlates the successive chip values with fixed sequences of correlation coefficients to generate correlation values. A decision circuit selects one of the correlation values to decide what symbol the spread spectrum signal represents. The correlation coefficients are obtained by applying the same modulation method as used to modulate the spread spectrum signal, and then the same demodulation method as used by the frequency detector, to the sequences of chips representing different symbols. Since synchronous detection is not employed, no carrier recovery circuit is needed.
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