System and method for adaptive interference cancelling

CAFC
  • US 6,483,923 B1
  • Filed: 08/06/1998
  • Issued: 11/19/2002
  • Est. Priority Date: 06/27/1996
  • Status: Expired due to Term
First Claim
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1. A method for processing digital input data representing signals containing a source signal from a signal source on-axis from an array of sensors as well as interference signals from interference sources located off-axis from the signal source and for producing digital output data representing the source signal with reduced interference signals relative to the source signal, comprising the steps of:

  • generating a main channel from the digital input data, the main channel representing signals received in the direction of the signal source and having a source signal component and an interference signal component;

    generating at least one reference channel from the digital input data, each reference channel representing signals received in directions other than that of the signal source;

    adaptively filtering said at least one reference channel using filter weight values to generate a cancelling signal approximating the interference signal component in the main channel;

    generating the digital output data by subtracting the cancelling signal from the main channel;

    deriving new filter weight values so that the difference between the main channel and the cancelling signal is minimized; and

    truncating the new filter weight values to predetermined threshold values when each of the new filter weight values exceeds the corresponding threshold value.

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