METHOD AND SYSTEM FOR ALIGNING SIGNALS WIDELY SPACED IN FREQUENCY FOR WIDEBAND DIGITAL PREDISTORTION IN WIRELESS COMMUNICATION SYSTEMS

摘要

A system for time-aligning signals with widely spaced frequencies includes a digital predistortion (DPD) processor and a power amplifier coupled to the DPD processor and capable of supplying a transmission signal at the power amplifier output. The system also includes a feedback loop connected to the power amplifier output. The feedback loop includes an adaptive partial delay filter, a delay estimator coupled to the adaptive partial delay filter, and a DPD coefficient estimator coupled to the delay estimator.