Digital Predistortion for nonlinear RF power amplifiers

A method, comprising:

• operating a device, that includes a receive filter, in different modes comprising an operational mode and a predistortion training mode, wherein the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second bandwidth during the predistortion training mode, the second bandwidth being wider than the first bandwidth;
• generating a digital transmit signal;
• receiving a digital receive signal via circuitry that comprises the receive filter;
• causing, in the predistortion training mode, the digital receive signal to be based on an amplified analog version of the digital transmit signal, wherein the amplified analog version is produced by a power amplifier having one or more nonlinear characteristics;
• storing signal samples responsive to the device being in the predistortion training mode, the signal samples including transmit samples based on the digital transmit signal and receive samples based on the digital receive signal;
• estimating one or more predistortion parameter values using information comprising the transmit samples and the receive samples;
• and
• using the one or more predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier.

A non-transitory computer-readable medium embodying a program operable to cause a device to perform operations, the operations comprising:

• causing the device, that comprises a receive filter, to operate in different modes comprising an operational mode and a predistortion training mode, wherein the receive filter is configured to operate at a first bandwidth during the operational mode and operate at a second bandwidth during the predistortion training mode, the second bandwidth being wider than the first bandwidth;
• generating a digital transmit signal;
• receiving a digital receive signal via circuitry that comprises the receive filter;
• causing, in the predistortion training mode, the digital receive signal to be based on an amplified analog version of the digital transmit signal, wherein the amplified analog version is produced by a power amplifier having one or more nonlinear characteristics;
• storing signal samples responsive to the device being in the predistortion training mode, the signal samples including transmit samples based on the digital transmit signal and receive samples based on the digital receive signal;
• estimating one or more predistortion parameter values using information comprising the transmit samples and the receive samples;
• and
• using the one or more predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier.