Title :
Wavelets and scaling functions as envelope waveforms for modulation
Author :
Daneshgaran, Fred ; Mondin, Marina
Author_Institution :
Dept. of Electr. & Comput. Eng., California State Univ., Los Angeles, CA, USA
Abstract :
We demonstrate that the use of scaling functions and wavelets as envelope waveforms for modulation is natural in light of the first Nyquist criterion for intersymbol interference (ISI) removal. The discrete orthonormal sequences generated using the filter bank theory can be used as practical means of generating such envelope functions. These waveforms can be used to modulate different information on adjacent channels that overlap in frequency. Using wavelet packets, we increase the number of dimensions available to the modulator per unit time, approaching the limit set by the dimensionality theorem
Keywords :
Nyquist criterion; band-pass filters; filtering theory; interference suppression; intersymbol interference; modulation; sequences; waveform analysis; wavelet transforms; ISI removal; adjacent channels; dimensionality theorem; discrete orthonormal sequences; envelope functions; envelope waveforms; filter bank theory; first Nyquist criterion; intersymbol interference; modulation; scaling functions; wavelet packets; Baseband; Communication systems; Drives; Fourier transforms; Frequency; Narrowband; Optical modulation; Pulse modulation; Pulse shaping methods; Wavelet packets;
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1994., Proceedings of the IEEE-SP International Symposium on
Conference_Location :
Philadelphia, PA
Print_ISBN :
0-7803-2127-8
DOI :
10.1109/TFSA.1994.467303
