DocumentCode
660325
Title
Iterative Correction of Clipped OFDM Signals with Unknown Clipping Levels
Author
Wellisch, Wilson D. ; Ulian, Ian A. ; Noll Barreto, Andre
Author_Institution
Agencia Nac. de Telecomun. - ANATEL Brasilia, Brasilia, Brazil
fYear
2013
fDate
2-5 June 2013
Firstpage
1
Lastpage
5
Abstract
Iterative correction can be employed to mitigate the distortion caused by nonlinear power amplifiers in OFDM systems. However, proposals found in the literature suppose that the receiver has perfect knowledge of the nonlinear conditions encountered in transmission. In this paper, we propose the use of the Extended Kalman Filter and the Unscented Kalman Filter to estimate the nonlinear characteristics of the amplifier before performing the iterative correction, and see that by using these filters, the amplifier clipping level can be correctly estimated even without a pilot signal.
Keywords
Kalman filters; OFDM modulation; iterative methods; power amplifiers; clipped OFDM signals iterative correction; extended Kalman filter; nonlinear power amplifiers; unknown clipping levels; unscented Kalman filter; Estimation; Kalman filters; Mathematical model; Noise; Nonlinear distortion; OFDM; Receivers;
fLanguage
English
Publisher
ieee
Conference_Titel
Vehicular Technology Conference (VTC Spring), 2013 IEEE 77th
Conference_Location
Dresden
ISSN
1550-2252
Type
conf
DOI
10.1109/VTCSpring.2013.6692607
Filename
6692607
Link To Document