A combination Technique based on Polynomial Method and look-up Table for Linearity Digital Pre-distortion in Power Amplifiers
Year: 2015
Type: article
Abstract: In this article, a new technique is proposed for linearity digital pre-distortion in power amplifiers for Orthogonal Frequency Division Multiplexing (OFDM) systems. For this purpose, a combination technique comprising look-up table (LUT) method and polynomial method is employed. For the Linear power amplifiers of the least mean square (LMS) method is a adaptive method, as possible a few hardware in implementation used and to have a fast response capability. Coefficients of look-up table are estimated by LMS method as a forward program with the least error amount in order to estimate modulator output of OFDM. In addition, designing of several radio frequency (RF) power amplifiers and their linearization unit in elimination of non-linear distortions of these amplifiers by linearity unit, and yet various realistic involved phenomena in base-band pre-distortion system design, are studied. Measures such as Adjacent Channel Power Ratio (ACPR) were adopted for the purpose of linearization measurement and comparison. The obtained results of the proposed technique are presented both by look-up table and frequency spectrum of output signal. The results also indicate appropriate performance of the proposed technique. Simulations were carried out on ADS software, while final signal output was extracted by MATLAB.
Authors: Mahsa Shokri, Javad Javidan
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2612530068