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Multiple simultaneous frequency and code acquisition for a code division multiple access (CDMA) communication system

  • US 7,386,069 B2
  • Filed: 04/26/2004
  • Issued: 06/10/2008
  • Est. Priority Date: 04/26/2004
  • Status: Active Grant
First Claim
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1. A method for acquiring a signal in a wireless receiver, comprising:

  • receiving a signal in a receiver;

    parallel processing the received signal in a plurality of matched filter stages, each matched filter stage comprising a plurality of registers, such that multiple codes are analyzed simultaneously, wherein the parallel processing further comprises;

    applying a first stage matched filter by performing a bit-wise operation on a plurality of received signal samples;

    applying a second stage matched filter by performing a bit-wise operation on a plurality of first stage frequency samples to develop a plurality of second stage signal samples;

    applying a multi-point discrete Fourier transform (DFT) to the second stage signal samples, wherein the multi-point discrete Fourier transform (DFT) results in signals occupying a plurality of frequency bins and the method further comprises determining a power of each of the second stage signal samples;

    averaging each of the signals within each of the multiple frequency bins to determine a maximum value; and

    performing a timing drift compensation on the signals in the multiple frequency bins having a frequency offset.

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