Title :
On the time-frequency localization of the wavelet signals, with application to orthogonal modulations
Author :
Oltean, Marius ; Isar, Alexandru
Author_Institution :
Fac. of Electron. & Telecommun., Commun. Dept., Univ. "Politech." Timisoara, Timisoara, Romania
Abstract :
Orthogonal modulations are powerful techniques for digital data transmission, very well suited to radio channels. They use orthogonal basis, whose elements will be the ldquosubcarriersrdquo used in transmission. Some advantages of the wavelet functions compared to the windowed complex exponentials used in orthogonal frequency division multiplexing (OFDM) are highlighted. Thus, theoretical proof that Daubechies wavelets have better time-frequency localization is provided, opening new paths towards modern orthogonal modulation approaches, based on wavelets.
Keywords :
OFDM modulation; wavelet transforms; wireless channels; Daubechies wavelets; OFDM; digital data transmission; orthogonal frequency division multiplexing; orthogonal modulations; radio channels; time-frequency localization; wavelet functions; wavelet signals; windowed complex exponentials; AWGN; Data communication; Demodulation; Digital modulation; Distortion; Modulation coding; OFDM modulation; Propagation delay; Signal processing; Time frequency analysis;
Conference_Titel :
Signals, Circuits and Systems, 2009. ISSCS 2009. International Symposium on
Conference_Location :
Iasi
Print_ISBN :
978-1-4244-3785-6
Electronic_ISBN :
978-1-4244-3786-3
DOI :
10.1109/ISSCS.2009.5206174
