Digital predistortion in varying operating conditions

A linearization system to perform digital predistortion of signals provided to a radio frequency (RF) transmission path configured to transmit radio signals in a plurality of subbands within a spectral range, the system comprising:

• the RF transmission path comprising at least one power amplifier that produces output with non-linear distortions;
• and
• a digital predistorter comprising an adaptation section and a compensator, the digital predistorter configured to:
• configure the compensator to predistort signals comprising arbitrary spectral content within the spectral range, including:
• acquire data samples representing operation of the RF transmission path to transmit radio signals in different subbands, each data sample including a digital input signal provided to the RF transmission path for transmission and a digital sensed signal representing a sensing of a radio transmission in response to the provided digital signal, the each digital input signal representing spectral content concentrated in a respective single corresponding subband within the spectral range, and
• update parameters of the digital predistorter according to the acquired data samples to mitigate non-linear characteristics of the RF transmission path;
• receive a further input signal for transmission by the RF transmission path, the further input signal representing spectral content in a particular subband within the spectral range;
• and
• use the configured compensator to process the further input signal to yield a predistorted signal for providing to the RF transmission path.

A non-transitory machine-readable medium storing a design structure comprising elements that, when processed in a computer-aided design system, generate a machine-executable representation of a linearization system that is used to fabricate hardware comprising:

• a radio frequency (RF) transmission path circuit comprising at least one power amplifier that produces output with non-linear distortions;
• and
• a digital predistorter circuit comprising an adaptation section and a compensator, the digital predistorter configured to:
• configure the compensator to predistort signals comprising arbitrary spectral content within the spectral range, including:
• acquire data samples representing operation of the RF transmission path circuit to transmit radio signals in different subbands, each data sample including a digital input signal provided to the RF transmission path circuit for transmission and a digital sensed signal representing a sensing of a radio transmission in response to the provided digital signal, the each digital input signal representing spectral content concentrated in a respective single corresponding subband within the spectral range, and
• update parameters of the digital predistorter according to the acquired data samples to mitigate non-linear characteristics of the RF transmission path circuit;
• receive a further input signal for transmission by the RF transmission path circuit, the further input signal representing spectral content in a particular subband within the spectral range;
• and
• use the configured compensator to process the further input signal to yield a predistorted signal for providing to the RF transmission path circuit.