Multi-band wide band power amplifier digital predistortion system

Abstract

A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.

We claim: 
     
         1 . A digital predistortion system comprising:
 a multi-band input signal;   at least one power amplifier for providing an amplified output including a distortion characteristic;   a feedback signal derived from the amplified output, the feedback signal including a representation of at least a portion of the distortion characteristic; and   predistortion logic responsive to an aliased representation of the feedback signal for generating predistortion coefficients for linearizing the amplified output of the power amplifier, wherein a sampling rate of the aliased representation of the feedback signal is less than twice a maximum bandwidth of the feedback signal.