International Journal of Managing Information Technology (IJMIT) WJCI Indexed

ISSN: 0975-5586 (Online); 0975-5926 (Print)

http://airccse.org/journal/ijmit/ijmit.html

Article:

Labib Francis Gergis, Misr Academy for Engineering and Technology, Egypt

Authors

Wahiba Ben Abdessalem Karaa, Institut Superieur de Gestion de Tunis, Tunisia

Abstract

Efficient RF power amplifiers used in third generation systems require linearization in order to reduce  adjacent  channel  inter-modulation  distortion,  without  sacrificing  efficiency.  Digital  baseband predistortion is a highly cost-effective way to linearize power amplifiers (PAs).                 New  communications  services  have  created  a  demand  for  highly  linear  high  power  amplifiers (HPA's). Traveling Wave Tubes Amplifiers ( TWTA ) continue to offer the best microwave HPA performance  in  terms  of  power  efficiency,  size  and  cost,  but  lag  behind  Solid  State  Power  Amplifiers  ( SSAP's  )  in  linearity.  This  paper  presents  a  technique  for  improving  TWTA  linearity.  The  use  of  pre-distorter (PD) linearization technique is described to provide TWTA performance comparable or superior to conventional SSPA's.  The characteristics of the  PD scheme is derived  based on the  extension of  Saleh's  model  for  HPA.  The  analysis  results  of  Multi-frequency  Minimum  Shift  Keying  (MF-MSK)  in non-linear channels are presented in this paper. 

Keywords

HPA, Nonlinear distortions, Saleh model, AM/AM and AM/PM, Pre-distortion, MF-MSK.

Paper URL

https://airccse.org/journal/ijmit/papers/3111ijmit05.pdf

Volume URL


https://airccse.org/journal/ijmit/vol3.html





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