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Active cancellation tuning to reduce a wireless coupled transmit signal

  • US 6,915,112 B1
  • Filed: 11/12/2000
  • Issued: 07/05/2005
  • Est. Priority Date: 11/12/2000
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver; and

    tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver, wherein the tuning the active cancellation control signal further comprises;

    measuring a first level of the signal strength indicator;

    adjusting an active cancellation control signal in a first direction;

    measuring a second level of the signal strength indicator;

    further adjusting the active cancellation control signal in the first direction if the second level is lower than the first level; and

    adjusting the active cancellation control signal in an opposite direction if the second level is higher than the first level; and

    iteratively measuring the signal strength indicator and either further adjusting the active cancellation control signal or adjusting the active cancellation control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of the signal strength indicator;

    wherein the active cancellation control signal locks after adjustment of the active cancellation control signal has switched directions at least twice.

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