Daubechies that orthogonal filter banks provide orthogonal bases for the Hilbert space of square-summable sequences stimulated a tremendous research activity in the area. Furthermore I. Daubechies showed that provided the filters satisfy constraints additional to PR, regular (or smooth) continuous-time functions (scaling functions and wavelets) can be obtained, which are orthogonal bases for the space of square-integrable functions ... displayed 300 characters
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We shall consider one important class of sequences, namely complementary sequences. These sequences were recently found to be efficient in a new modulation for wireless communications, called spread-signature CDMA . The connection between two-channel orthogonal FIR filter banks and aperiodic complementary sequences was observed by several researchers [7, 9] and is not novel... displayed next 300 characters
The feature of this package is that it uses MATLAB for the numerical computations and thus it is called MFILTERS. MATLAB is now available in any university or industry, and it is used, among many other things, in the design of circuits and systems...
Each gain of new knowledge, however, grows with others, and it becomes difficult, if not impossible, to retrace absolutely the steps of discovery. Hilbert referred to this phenomena as the "ever-recurring interplay between thought and experience...
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