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PN code acquisition with adaptive antenna array and adaptive threshold for CDMA wireless communications

  • US 6,404,803 B1
  • Filed: 10/24/2000
  • Issued: 06/11/2002
  • Est. Priority Date: 10/24/2000
  • Status: Expired due to Term
First Claim
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1. A method for acquiring a pseudo-noise (PN) code comprising the steps of:

  • accumulating despread samples obtained from a plurality of elements in a smart antenna array at a sampling rate, the samples being despread using a PN code shifted by a trial PN code phase error, separate accumulations being maintained for each element;

    updating an antenna array weight vector based on the accumulated despread samples;

    forming a spatially correlated signal by weighting the accumulated despread samples from each element with a corresponding weight from the updated antenna array weight vector and combining the weighted samples;

    comparing the spatially correlated signal to a threshold to determine whether PN code acquisition has been achieved; and

    selecting a new trial PN code phase error and repeating the accumulating, updating, forming and comparing steps if PN code acquisition has not been achieved.

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