DocumentCode :
395430
Title :
Time delay estimation in digital pre-distortion
Author :
Durney, H. ; Sala, Josep
Author_Institution :
Dept. de Teoria del Senyal i Comunicacions, Univ. Politecnica de Catalunya, Barcelona, Spain
Volume :
4
fYear :
2003
fDate :
6-10 April 2003
Abstract :
OFDM communications require extreme linearity of high power amplifiers (HPA) to avoid intercarrier interference (ICI) and subsequent degradation of the BER and quality of service (QoS). Amplitude (AM/AM) and phase (AM/PM) amplifier nonlinearities can be compensated in a number of ways. Nevertheless, digital adaptive schemes based on least squares optimization criteria need estimate the delay introduced by the analog chains in the generation of the error signal. A sufficiently precise HPA input-output time delay estimate (TDE) is necessary before attempting pre-distortion of the amplifier itself. This paper introduces statistical criteria for this initial acquisition stage.
Keywords :
OFDM modulation; adaptive modulation; delay estimation; digital communication; indoor radio; least squares approximations; optimisation; power amplifiers; statistical analysis; HPA; OFDM communications; analog chains; digital adaptive schemes; digital pre-distortion; high power amplifiers; input-output time delay estimate; least squares optimization criteria; statistical criteria; time delay estimation; Bit error rate; Degradation; Delay effects; Delay estimation; High power amplifiers; Interference; Least squares approximation; Linearity; OFDM; Quality of service;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on
ISSN :
1520-6149
Print_ISBN :
0-7803-7663-3
Type :
conf
DOI :
10.1109/ICASSP.2003.1202698
Filename :
1202698
Link To Document :
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