METHODS AND APPARATUS FOR ADAPTIVE NONLINEAR COINCIDENT INTERFERENCE CANCELLATION

摘要

Methods and apparatus to cancel an interfering signal using an analog cancellation stage followed by a digital cancellation stage. In an exemplary embodiment, the interfering signal is processed to determine modulation type for removal in the analog domain. The digital stage provides further interference reduction in the digital domain.

主权项

1. A system, comprising:
an analog cancellation stage to receive an input signal having a signal of interest and an interfering signal, comprising:
a first ADC to digitize the input signal;a first signal processing module to process the digitized input signal;a first cancellation signal generator coupled to the first signal processing module for generating a first cancellation signal based upon at least one characteristic of the interfering signal to remove at least a portion of the interfering signal;a DAC to transform the first cancellation signal to the analog domain; andan analog removal module coupled to the DAC to remove the first cancellation signal from the analog input signal and provide an analog output signal; a second ADC coupled to the analog cancellation stage to receive the analog output signal and generate a digital output signal; and a digital cancellation stage coupled to an output of the second ADC, the digital cancellation stage comprising:
a second signal processing module to process the digital output signal from the second ADC;a second cancellation signal generator coupled to the second signal processing module; anda digital interference removal module coupled to the output of the second ADC and to the second cancellation signal generator module for removing at least a portion of the interfering signal that remains after removal by the analog removal module.