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Coupled interference concellation system for wideband repeaters in a cellular system

  • US 6,385,435 B1
  • Filed: 04/20/2000
  • Issued: 05/07/2002
  • Est. Priority Date: 04/20/2000
  • Status: Expired due to Fees
First Claim
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1. A repeater, comprising:

  • a receiving antenna which receives a desired signal at a given frequency;

    a transmitting antenna which transmits an output signal at said given frequency, input signals to the receiving antenna including said desired signal and a coupled interference signal consisting of said output signal delayed in time;

    first means for generating a pilot signal;

    second means for combining said pilot signal with said output signal;

    third means for detecting quadrature components of a portion of said pilot signal included in said coupled interference signal;

    fourth means for sampling said output signal;

    fifth means for adjusting an amplitude and a phase of a sample of said output signal based on the properties of the said portion of the pilot signal included in said coupled interference signal;

    sixth means for delaying the adjusted sample of said output signal; and

    seventh means for combining said adjusted sample of said output signal with said input signal to cancel said coupled interference signal.

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