Patent ID: 6539204
Filing Date: 2003-03-25
Classification: H04B

Abstract:
An apparatus comprising:a quadrature phase shifter to phase shift a model of a first signal received from a first local wireless transmitter to provide a quadrature signal, said first signal to cause a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter; a first mixer to mix the model of the first signal with a signal received by the local receiver to provide a first mixed signal; a second mixer to mix the quadrature signal with the signal received by the local receiver to provide a second mixed signal; a first loop filter to integrate and low pass filter the first mixed signal to provide a first error signal; a second loop filter to integrate and low pass filter the second mixed signal to provide a second error signal; a first bipolar amplifier to amplify the model of the first signal in proportion to the first error signal to provide a first amplified signal; a second bipolar amplifier to amplify the quadrature signal in proportion to the second error signal to provide a second amplified signal; and a summer to combine the first amplified signal and the second amplified signal to provide a cancellation signal to the local wireless receiver to reduce interference in the second signal caused by the coupled signal.