Method and apparatus for controlling update of digital pre-distortion coefficient

摘要

A method and apparatus for controlling update of digital pre-distortion (DPD) coefficient is provided. The apparatus is applicable to a digital power control system, wherein the apparatus comprises: an update controlling unit configured to determine a group of fully-trained DPD coefficients among a plurality of DPD coefficients; and a DPD coefficient generating unit configured to update adaptively the group of fully-trained DPD coefficients according to the result of judgment of the update controlling unit. The DPD coefficients are allowed to be updated after being judged as being able to be fully trained according to power distribution information of DPD input signals, or according to address distribution information of an LUT, or according to average power of output of an HPA; otherwise, they may not be updated, thereby efficiently preventing DPD abnormality resulted from unfull training of coefficients in being updated.

主权项

1. An apparatus for controlling an update of at least one digital pre-distortion (DPD) coefficient, applicable to a digital power control system, the apparatus comprising:
an update controlling unit configured to perform a judgment to determine a group of fully-trained DPD coefficients among a plurality of DPD coefficients; and a DPD coefficient generating unit configured to adaptively update the group of fully-trained DPD coefficients according to a result of the judgment performed by the update controlling unit; wherein the update controlling unit determines the group of fully-trained DPD coefficients according to power distribution information of a DPD input signal; wherein each of the plurality of DPD coefficients corresponds to a specific power level, and for each specific power level, if a probability that instantaneous power of the DPD input signal is greater than the specific power level is greater than a first threshold value, the update controlling unit determines that the DPD coefficient to which the specific power level corresponds is fully trained.