System and method for digital interference cancellation

摘要

A system and method for receiving a signal, comprising an input adapted to receive a radio frequency signal having a strong interferer; a signal generator, adapted to produce a representation of the interferer as an analog signal generated based on an oversampled digital representation thereof; and a component adapted to cancel the strong interferer from radio frequency signal based on the generated analog signal to produce a modified radio frequency signal substantially absent the interferer. The system typically has a nonlinear component that either saturates or produces distortion from the strong interferer, which is thereby reduced. The system preferably employs high speed circuits which digitize and process radio frequency signals without analog mixers.

主权项

1. A receiver comprising:
a saturable component, configured to receive a signal having an amplitude, and to process the signal if the amplitude is below a threshold, and being subject to saturation if the received signal is above a threshold; an input configured to receive an analog radio frequency input signal within a radio frequency band comprising a modulated signal and an interfering signal, the interfering signal having an amplitude sufficient to exceed the threshold and saturate the saturable component; a signal generator, configured to generate a nulling analog radio frequency signal which tracks a phase of the interfering signal over time; a subtractor, ahead of the saturable component, configured to receive a representation of the analog radio frequency signal and the nulling signal, and to produce a modified representation of the analog radio frequency signal with a representation of the undesired signal having an amplitude below the threshold; and an output of the saturable component which corresponds to the modulated signal without saturation interference by the interfering signal.