Software defined radio front end

A computer-implemented apparatus for a front end comprising:

• an antenna configured to transmit and receive radio frequency signals;
• a non-transitory storage medium configured to store computer-executable instructions;
• and
• a processor operably coupled to the non-transitory storage medium and configured to execute the computer-executable instructions of:
• injecting a first tone generated by a tone generator at an edge of a frequency band of a receive channel;
• sweeping a first tone through the frequency band of the receive channel;
• injecting the first tone in the frequency band of the receive channel;
• receiving a first signal and a second signal containing interference;
• compensating the first signal for gain and phase imbalances using the first tone;
• characterizing the receive channel using the first tone;
• and
• processing the compensated first signal using an infinite impulse response filter to generate an interference cancelling signal.

A method for configuring a front end comprising:

• receiving a first signal;
• sampling the first signal;
• amplifying the first signal in a first pathway;
• phase-shifting the sampled first signal in a second pathway;
• adding the amplified first signal to the phase-shifted, sampled first signal to generate a carrier-cancelled signal;
• and
• coupling the amplified first signal to the carrier-cancelled signal.