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Wireless repeater implementing low-level oscillation detection and protection for a duplex communication system

  • US 7,706,744 B2
  • Filed: 05/26/2005
  • Issued: 04/27/2010
  • Est. Priority Date: 05/26/2004
  • Status: Active Grant
First Claim
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1. A wireless repeater comprising a base unit antenna, a tower-signal antenna, and a bi-directional amplifier configured to send duplex repeater signals between the base unit antenna and the tower-signal antenna, the bi-directional amplifier comprising:

  • oscillation detection circuitry configured to detect feedback oscillations occurring in the repeater signals by discriminating the feedback oscillations from valid CDMA communication signals occurring in the repeater signals by detecting a power amplitude envelope occurring in the repeater signals and a high frequency content occurring in the power amplitude envelope indicative of CDMA communication signals; and

    oscillation protection circuitry configured to decrease or disconnect power to at least one component of the bi-directional amplifier in response to the detection of feedback oscillations.

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