**51. Wavelet Shift-Keying: A New Digital Modulation**

This note introduces the preliminary ideas of a new digital modulation
scheme termed Wavelet Shift Keying (WSK),

which is based on discrete wavelet transforms. The source bit stream
is translated into a sequence of scales

indicating which version of the mother wavelet should be transmitted
in each symbol slot.

The modulated signal therefore consists in a sequence of overlapping
(or non-overlapping) scaled-translated versions of a wavelet.

Such schemes can be viewed as a generalisation of "wavelet-based OFDM
systems". Simple examples of deO-modulation and

Mexican hat modulation are presented.

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