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US 10,917,051 B2Granted
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.
Claims16
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;
- and
- an antenna port configured to couple the RF front end module to a phased array of dual polarized antennas, the dual polarized antennas each having a horizontal polarization and a vertical polarization, wherein the DPD feedback circuit feeds back samples of the PAs outputs detected by one of the horizontal or vertical polarizations of the dual polarized antennas not used for transmitting.
3 more elements
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,
- wherein the wireless communication device further comprises:
- an RF front end coupled to the baseband processing module via the RF FEM port connector, the RF front end including the plurality of RF PAs;
- a DPD feedback circuit to provide the DPD feedback signal to the baseband processing module via the RF FEM port connector;
- and
- a phased array of dual polarized antennas coupled to the RF front end and outputs of the plurality of RF PAs,
- wherein the detected output samples are detected by a polarization of each antenna of the phased array of dual polarized antennas, not being used for transmission.
8 more elements
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,
- wherein a dual polarized antenna is coupled to an output of each PA, the dual polarized antenna having a first polarization for transmitting each PAs output signal, and a second polarization for receiving, and wherein detecting comprises using the second polarization for receiving to detect the power amplified signal transmitted from the first polarization for transmitting on the same dual polarized antenna.
4 more elements
Dependencies are inferred from the claim text.