Importance

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Abstract

An interference cancelling system for cancelling or minimizing multiple signal components of a received signal in a radio receiver caused by an interfering signal from a radio transmitter which interfering signal follows multiple paths to the radio receiver includes a directional coupler which samples the interfering signal transmitted from the radio transmitter and provides a primary sample signal, a transmission link which defines a primary sample signal path from the radio transmitter to the radio receiver, a power splitter for dividing a portion of the primary sample signal path into a plurality of secondary sample signal paths, a power combiner for combining the plurality of secondary sample signal paths back into the primary signal path, and a 180.degree. hybrid coupled to the primary sample signal path and to the radio receiver. The secondary sample signal paths include delay lines and attenuator pads. The power combiner has an output which provides an adjusted primary sample having signal components corresponding to the secondary sample signals that are substantially equal in amplitude and time delay to the corresponding multiple signal components of the received signal caused by the interfering signal. The hybrid subtracts the adjusted primary sample signal from the received signal so that the signal components of the adjusted primary sample signal cancel or at least minimize the corresponding multiple signal components of the received signal caused by the interfering signal.

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First Claim