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Method of searching for a bursty signal

  • US 5,867,527 A
  • Filed: 03/04/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Term
First Claim
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1. A method of receiving a signal comprised of a group of spread spectrum signals sharing a common frequency band and isolating a first signal from among said group of spread spectrum signals to determine a signal strength at a path delay time offset from a zero offset reference time of said first signal wherein said first signal comprises a series of symbols wherein a portion of said series of said symbols are grouped together in a symbol set wherein each symbol in a common symbol set is transmitted at a fixed power level wherein successive symbol sets may be transmitted at a variety of signal levels wherein said variety of signal levels includes a zero level wherein transmission of said first signal is gated off, said method comprising the steps of:

  • searching a first set of call signal samples corresponding to a first symbol set for said first signal at a first offset to produce a first power estimate thereof;

    searching a second set of call signal samples corresponding to said first symbol set for said first signal at said first offset to produce a second power estimate thereof;

    summing said first and second power estimates to produce a symbol set power level estimate at said first offset;

    searching a third set of call signal samples corresponding to a second symbol set for said first signal at a second offset to produce a third power estimate thereof;

    searching a fourth set of call signal samples corresponding to said second symbol set for said first signal at said second offset to produce a fourth power estimate thereof; and

    summing said third and fourth power estimates to produce a symbol set power level estimate at said second offset;

    wherein said first symbol set and said second symbol set correspond to time contiguous symbol sets and wherein said steps of searching are performed continually.

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