DIGITAL SUPPRESSION OF TRANSMITTER INTERMODULATION IN RECEIVER

摘要

Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.

主权项

1. A system comprising:
a transmitter configured to upconvert and amplify a digital transmit signal provided at an input of the transmitter to provide an analog radio frequency transmit signal at an output of the transmitter, the analog radio frequency transmit signal comprising a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver; the main receiver configured to amplify and downconvert an analog radio frequency receive signal to provide a digital receive signal at an output of the main receiver; and a digital feedforward transmit noise cancellation subsystem configured to:
generate a digital transmitter noise cancellation signal representative of the transmitter noise in the receive band of the main receiver at the output of the main receiver based on the digital transmit signal; andsubtract the digital transmitter noise cancellation signal from the digital receive signal output by the main receiver to provide a compensated digital receive signal.