Patent ID: 8855175

Claim:
A communication device comprising: a transmitter configured to receive a digital input signal and output a radio frequency transmit signal that is transmitted by the communication device; a main receiver configured to receive a radio frequency receive signal and output a digital output signal, the digital output signal comprising passive intermodulation distortion that is a non-linear function of the radio frequency transmit signal output by the transmitter; a combined digital predistortion and passive intermodulation estimate generation subsystem configured to: receive the digital input signal of the transmitter; predistort the digital input signal of the transmitter according to a behavioral model of an inverse of a nonlinearity of the transmitter; and generate a digital passive intermodulation estimate signal that is an estimate of the passive intermodulation distortion in the digital output signal of the main receiver based on the digital input signal of the transmitter according to a behavioral model of the transmitter, a source of the passive intermodulation distortion, and the main receiver; and subtraction circuitry configured to subtract the digital passive intermodulation estimate signal from the digital output signal of the main receiver to thereby provide a compensated digital output signal.