Title :
Wavelet based OFDM for wireless channels
Author :
Negash, B.G. ; Nikookar, H.
Author_Institution :
Int. Res. Center for Telecommunications-Transmission & Radar, Delft Univ. of Technol., Netherlands
Abstract :
The main objective of this paper is to replace the conventional Fourier based complex exponential carriers of the OFDM system with some orthonormal wavelets in order to reduce the level of interference. The wavelets are derived from multistage tree-structured Haar and Daubechies orthonormal quadrature mirror filter (QMF) bank. Compared with the conventional OFDM, it is found that the Haar and Daubechies-based orthonormal wavelets are capable of reducing the power of intersymbol interference (ISI) and intercarrier interference (ICI), which are caused by the loss in orthogonality between the carriers as a result of the multipath wireless channel
Keywords :
OFDM modulation; channel bank filters; filtering theory; interference suppression; intersymbol interference; multipath channels; quadrature mirror filters; wavelet transforms; ICI; ISI; high-speed data communications; intercarrier interference; interference reduction; intersymbol interference; multipath wireless channel; multistage tree-structured wavelets; orthogonal frequency division multipexing; orthonormal QMF bank; orthonormal wavelets; performance analysis; quadrature mirror filter; simulation results; two-path channel; wavelet based OFDM; wireless channels; AWGN; Convolution; Filters; Intersymbol interference; OFDM; Performance analysis; Propagation delay; Radar; Transmitters; Wireless sensor networks;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944931
