Title :
Novel Predistortion Algorithm for OFDMA
Author :
Ali, Saqib ; Markarian, Garik ; Arikan, Erdal
Author_Institution :
Dept. of Commun. Syst., Lancaster Univ., Lancaster
Abstract :
RF amplifier in a wireless communication system is usually non-linear in nature. If such an amplifier is used in OFDMA based systems, it will cause serious degradation. This degradation will be both in terms of the reduction in BER and the generation of out of band noise. In this paper we have worked on the linearization method of the amplifier. This work is on a hybrid methodology, in which estimation of the model is performed in frequency domain and compensation is performed in time domain. The downlink preamble of the IEEE802.16e system is used here for the estimation purpose. The results for the suppression of spectra are shown at the end.
Keywords :
OFDM modulation; WiMax; interference suppression; linearisation techniques; multi-access systems; power amplifiers; radiocommunication; radiofrequency amplifiers; IEEE 802.16 e; OFDMA; amplifier linearization method; predistortion algorithm; Bit error rate; Degradation; Downlink; Frequency domain analysis; Frequency estimation; Noise generators; Noise reduction; Predistortion; Radiofrequency amplifiers; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-2517-4
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2009.5073716
