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Pseudo Noise Coded Communication Systems

  • US 20090290660A1
  • Filed: 07/06/2009
  • Published: 11/26/2009
  • Est. Priority Date: 06/17/2004
  • Status: Abandoned Application
First Claim
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1. An apparatus for pseudo noise (PN) code phase acquisition comprising:

  • an oscillator;

    an analog to digital converter adapted to receive a baseband signal having a PN code phase, said analog to digital converter being adapted to sample said baseband signal at a rate controlled by said oscillator and to output a vector of sequential samples, each sequential sample having a length of 2N

    1, wherein the vector of sequential samples is permuted from the analog to digital converter to generate a permuted vector;

    a fast Walsh transform engine adapted to perform a fast Walsh transform on the permuted vector and to output an output vector from the vector of sequential samples generated by the analog to digital converter; and

    a peak detector adapted to detect the largest correlation with a target PN maximal length sequence having a length of 2N

    1 within the vector of sequential samples and determine a dominant peak in said output vector, wherein the dominant peak is unpermuted to map into the PN code phase.

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