Patent ID: 9385764
Filing Date: 2016-07-05
CPC Classification: H03F,H04B,H04L

Claim Text:
1. A digital pre-distortion method comprising: for each of two or more initial signals to be amplified simultaneously by a non-linear power amplifier, filtering the initial signal in each of N interrelated filters of a respective filter bank to produce N digital filtered signals, N being an integer greater than 1, wherein the initial signal and each of the digital filtered signals have a first sample rate R and multiplexed impulse responses of the interrelated filters of the respective filter bank define an overall filter function comprising a pass band associated with a transmission frequency of the initial signal; combining corresponding digital filtered signals of each of the two or more initial signals to produce N composite digital signals having the first sample rate R; applying digital pre-distortion at a processing rate R to each of the composite digital signals to produce N pre-distorted composite digital signals having the first sample rate R; and multiplexing the N pre-distorted composite digital signals to produce a pre-distorted digital signal having a second sample rate N times R, wherein: the pre-distorted digital signal comprises a signal component of each of the two or more initial signals; the processing rate R and the sample rate R, are equal; and the second sample rate N times R is greater than or equal to a total bandwidth comprising the transmission frequencies of the two or more initial signals.