Wireless Architectures and Digital Pre-Distortion (DPD) Techniques Using Closed Loop Feedback for Phased Array Transmitters
AssigneeIntel Corporation
InventorIgal Kushnir
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Abstract
Methods and architectures for closed loop digital pre-distortion (DPD) in a multi-stream phased array communication system include sampling outputs, from transmit antennas or dedicated analog detectors, of a plurality of RF power amplifiers operating in transmission of multi-stream transmission, correcting or normalizing the detected outputs, summing the outputs into a combined DPD feedback signal and selecting pre-distortion vectors to be used in altering the output of the PAs.
Claims21
1-20. (canceled)
A wireless communication device comprising:
- a radio frequency (RF) front end module comprising:
- a plurality radio frequency (RF) power amplifiers (PAs) configured to amplify a plurality of signals to be transmitted simultaneously in parallel;
- and
- a digital pre-distortion (DPD) feedback circuit configured to feedback samples of the PAs outputs, wherein the DPD feedback circuit comprises a combiner to combine a plurality of PAs outputs detected in parallel into a single combined DPD feedback signal.
A wireless communication device, comprising:
- a radio frequency (RF) front end module (FEM) port connector;
- and
- a baseband processing module coupled to the RF FEM port connector,
- wherein the baseband processing module is configured to receive a digital pre-distortion (DPD) feedback signal via the RF FEM port connector, the DPD feedback signal comprising a summed plurality of detected output samples of a plurality of radio frequency (RF) power amplifiers (PAs) used for simultaneous multi-stream transmissions, and
- wherein the baseband processing module includes a processing circuit configured to, based on the received DPD feedback signal, select digital pre-distortion signals for pre-distorting each of said plurality of RF PAs.
A method for wireless communication, the method comprising:
- detecting a power amplified (PA) signal from outputs of each power amplifier (PA) of a plurality of amplifiers (PAs) operating in a multi-stream transmit mode;
- combining the detected PA signals into a single digital pre-distortion (DPD) feedback signal;
- communicating the combined single DPD feedback signal to a digital processing unit;
- selecting a magnitude and phase correction for pre-distorting each of the power amplifiers based on the single combined DPD feedback signal;
- and
- applying the selected magnitude and phase corrections to each PA relevant to the combined single DPD feedback signal.
Dependencies are inferred from the claim text.