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Two stage radio frequency interference cancellation system and method

  • US 10,097,221 B1
  • Filed: 12/04/2017
  • Issued: 10/09/2018
  • Est. Priority Date: 08/07/2008
  • Status: Active Grant
First Claim
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1. A radio frequency interference cancelling system, comprising:

  • an input port configured to receive a plurality of radio frequency signals within a common radio frequency communication band;

    a signal combiner, configured to receive the plurality of radio frequency signals within the common radio frequency communication band, and a cancellation signal, and produce a combined output signal;

    a digitizer, configured to generate a digitized stream of data representing an amplitude of the combined output signal;

    an adaptive signal cancellation processor, configured to;

    generate the cancellation signal according to a set of estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band; and

    iteratively estimate the phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band based on at least a correlation of a signal represented in the digitized stream of data and the estimated phase and amplitude characteristics of the at least one of the radio frequency signals, wherein in subsequent iterations, the estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band are modified to minimize a mean correlation; and

    a demodulator configured to demodulate information from the digitized stream of data.

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