MULTI-BAND RADIO-FREQUENCY DIGITAL PREDISTORTION

摘要

Systems and methods for radio frequency digital predistortion in a multi-band transmitter are disclosed. In one embodiment, the multi-band transmitter includes a digital upconversion system configured to digitally upconvert digital input signals to provide digital radio frequency signals. Each digital input signal and thus each digital radio frequency signal corresponds to a different band of a multi-band transmit signal to be transmitted by the multi-band transmitter. The multi-band transmitter also includes a radio frequency digital predistortion system configured to digitally predistort the digital radio frequency signals to provide predistorted digital radio frequency signals, and a combiner configured to combine the predistorted digital radio frequency signals to provide a multi-band predistorted digital radio frequency signal.

主权项

1. A multi-band transmitter, comprising:
a digital upconversion system configured to digitally upconvert a plurality of digital input signals to provide a plurality of digital radio frequency signals, each digital input signal of the plurality of digital input signals and thus each digital radio frequency signal of the plurality of digital radio frequency signals corresponding to a different band of a plurality of bands of a multi-band transmit signal to be transmitted by the multi-band transmitter; a radio frequency digital predistortion system configured to digitally predistort the plurality of digital radio frequency signals to provide a plurality of predistorted digital radio frequency signals, wherein the radio frequency digital predistortion system directly synthesizes intra-band and inter-band distortion products; and combiner circuitry configured to combine the plurality of predistorted digital radio frequency signals to provide a multi-band predistorted digital radio frequency signal.