System and methods for generating ultra-wide band communication signal including: filtering a digital data pulse having a data clocking rate by mixing a filter-function pulse with the digital data pulse; generating a harmonic of a clock oscillator which appears as a center frequency of emission of frequency spread spectrum signal; and mixing the filtered digital data pulse with the harmonic of the clock oscillator signal, characterized in that the clock oscillator frequency, the data clocking rate, and the center frequency of signal emissions are harmonically related are disclosed.