The application of digital predistortion in base-band

signal is an extended method of amplifier linearization

to reduce the Adjacent Channel Interference (ACI) in

those systems in which a varying envelope modulation

scheme is used. This paper propose a particular

predistorter configuration and presents some design

considerations and simulation results in relation with the

use of fixed point Digital Signal Processor (DSPs). Less

than -60 dB out-of-band emission can be obtained for a

narrow bandwidth system.