Systems and methods for intelligently-tuned digital self-interference cancellation

A system for digital self-interference cancellation comprising:

• a filter coupled to a digital residue signal of a communication system that reduces noise, thereby generating a first reduced-noise digital residue signal;
• a channel estimator coupled to the filter that generates a current self-interference channel estimate from a sampled digital transmit signal, the first reduced-noise digital residue signal, and past self-interference channel estimates;
• wherein the channel estimator generates the current self-interference channel estimate according to a digital transform configuration;
• a controller that dynamically sets the digital transform configuration in response to changes in a controller-sampled digital residue signal;
• and
• a channel memory, coupled to the channel estimator, that stores the past self-interference channel estimates;
• wherein the system generates a digital self-interference cancellation signal from the current self-interference channel estimate and the sampled digital transmit signal;
• wherein the digital self-interference cancellation signal is combined with a receive signal of the communication system to form the digital residue signal.