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US 2020/0052659 A1Published application
Method and system for aligning signals widely spaced in frequency for wideband digital predistortion in wireless communication systems
AssigneeDali Systems Co. Ltd.
InventorWan Jong Kim
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Abstract
A system for time aligning widely frequency spaced signals includes a digital predistortion (DPD) processor and a power amplifier coupled to the DPD processor and operable to provide a transmit signal at a power amplifier output. The system also includes a feedback loop coupled to the power amplifier output. The feedback loop comprises an adaptive fractional delay filter, a delay estimator coupled to the adaptive fractional delay filter, and a DPD coefficient estimator coupled to the delay estimator.
Claims1
A system for time aligning widely frequency spaced signals, the system comprising:
- a digital predistortion (DPD) processor;
- a power amplifier coupled to the DPD processor and operable to provide a transmit signal at a power amplifier output;
- and
- a feedback loop coupled to the power amplifier output, wherein the feedback loop comprises:
- an adaptive fractional delay filter;
- a delay estimator coupled to the adaptive fractional delay filter;
- and
- a DPD coefficient estimator coupled to the delay estimator.
5 more elements
Dependencies are inferred from the claim text.