Low complexity all digital pim compensator

摘要

The present disclosure relates to compensation for Passive Intermodulation (PIM) distortion in a receiver. In one embodiment a communication device includes a transmitter that is configured to receive a digital input signal and output a radio frequency transmit signal a main receiver configured to receive a radio frequency receive signal and output a digital output signal and a PIM compensation subsystem. The radio frequency receive signal includes PIM distortion that is a non linear function of the radio frequency transmit signal output by the transmitter. In order to compensate for the PIM distortion a PIM compensation subsystem receives the digital input signal of the transmitter generates a digital PIM estimate signal that is an estimate of the PIM distortion in the digital output signal of the main receiver and subtracts the digital PIM estimate signal from the digital output signal of the main receiver.