Title :
Conditional entropy based coarse time delay estimation in the presence of AM/AM and AM/PM non-linearities
Author_Institution :
Dept. de Teoria del Senyal i Comunicacions, Univ. Politecnica de Catalunya, Barcelona, Spain
Abstract :
Pre-distortion algorithms for the compensation of AM/AM and AM/PM non-linearities of high power amplifiers (HPA) require a previous estimation of the delay introduced by the analog chains at the input and output of the amplifier. This paper presents a coarse time delay estimation (TDE) algorithm to within one-sample resolution based on a conditional entropy principle. The delay estimate is computed via one dimensional search on the proposed TDE spectrum.
Keywords :
OFDM modulation; amplitude modulation; delay estimation; digital video broadcasting; entropy; nonlinear distortion; phase modulation; power amplifiers; search problems; signal resolution; signal sampling; AM/AM nonlinearities; AM/PM nonlinearities; DVB-T; HPA; OFDM; TDE spectrum; Terrestrial Digital Video Broadcasting; analog chains; coarse time delay estimation; compensation; conditional entropy; high power amplifiers; one dimensional search; one-sample resolution; pre-distortion algorithms; Amplitude modulation; Baseband; Delay effects; Delay estimation; Digital video broadcasting; Entropy; Filters; High power amplifiers; Nonlinear distortion; Phase distortion;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on
Print_ISBN :
0-7803-7663-3
DOI :
10.1109/ICASSP.2003.1202710
