Two stage radio frequency interference cancellation system and method

摘要

A radio frequency receiver subject to a large in-band interferor employs active cancellation with coarse and at least one cancellation signals, each with a respective radio frequency combiner, in order to increase the effective dynamic range of the receiver for weak signals of interest. One or both can be digitally synthesized. This is particularly applicable for co-site interference, whereby the interfering transmit signal is directly accessible. A similar system and method may also be applied to external interferors such as those produced by deliberate or unintentional jamming signals, or by strong multipath signals. An adaptive algorithm may be used for dynamic delay and gain matching. In a preferred embodiment, a hybrid technology hybrid temperature system incorporates both superconducting and semiconducting components to achieve enhanced broadband performance.

主权项

1. An interference suppression method, comprising:
receiving a combined signal comprising a signal of interest conveying information and an interfering signal present in a common signal band; generating an analog signal having a controllable delay and magnitude selectively corresponding to a predicted future state of the interfering signal based on a digitally implemented model, by at least one automated processor; combining the combined signal with the generated analog signal with the delay and magnitude controlled to at least partially reduce a ratio of a power of the interfering signal and the signal of interest, to produce a model-based interference suppressed signal; combining the model-based interference suppressed signal with a feedback-controlled cancellation signal to produce an output signal; and generating the feedback-controlled cancellation signal, based on at least the output signal.