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 digital feedforward transmit noise cancellation subsystem configured to: generate a digital transmitter noise cancellation signal representative of transmitter noise in a receive band of a main receiver at an output of the main receiver based on a digital transmit signal input to a transmitter; and subtract the digital transmitter noise cancellation signal from a digital receive signal output by the main receiver to provide a compensated digital receive signal.