Patent ID: 9225363
Filing Date: 2015-12-29
Classification: H03F,H04B

Abstract:
1. A digital pre-distortion transmitter, comprising: a pre-distortion unit configured to update a pre-distortion coefficient required by pre-distortion processing, and perform the pre-distortion processing on a baseband signal; a signal process and transmit unit configured to perform signal processing on the pre-distortion-processed baseband signal and transmission thereof; and a feedback signal process unit configured to process a feedback signal of the signal transmitted by the signal process and transmit unit, so as to supply a dynamic drain voltage to a power amplifier in the signal process and transmit unit by using the processed feedback signal; wherein the feedback signal process unit comprises: a frequency mixer configured to convert the feedback signal into a baseband signal having a center frequency of zero; a power calculator configured to calculate in-band power of the feedback signal processed by the frequency mixer or a voltage signal reflecting the in-band power, and out-band power for updating the pre-distortion coefficient; a pulse width modulation signal generator configured to generate a pulse width modulation signal according to the in-band power or the voltage signal reflecting the in-band power; and a buck converter configured to generate the dynamic drain voltage according to the pulse width modulation signal; and wherein, the pre-distortion unit updates the pre-distortion coefficient by using the feedback signal processed by the feedback signal process unit.