I studied ultra wideband decades before they started to write papers refering to UWB standard definitions [1] so I might be out of tune (pun intended) with curr

I studied ultra wideband decades before they started to write papers refering to UWB standard definitions [1] so I might be out of tune (pun intended) with current definitions. A transceiver could use attosecond 10^−18, femtosecond 10^−15 picosecond 10^−12 or nanosecond 10^−9 pulses at very irregularly intervals. That seems (almost) random to any observer but not to a receiver which has pre-agreed those irregularly intervals with the transmitter (for example with quantum key distribution, with entangled particles). The receiver measures if there was a signal or not. It does not use power level, frequency, or phase (or a combination of these) of a sinusoidal wave but by generating radio energy at specific time intervals and occupying a large bandwidth, thus enabling pulse-position or time modulation. Not just spacial distribution can be used. You could use polarised photons, electron spin, etc. In my wafer scale integration [2] I use very few free space photos to flip a 1 v transistor in an ultra wideband mode. I refer you to [3] for [4] for a better explanation, even though ultra wideband is not mentioned specifically. Contact me directly, I'll be happy to lecture for a few hours to answer your question. [1] https://scholar.google.com/scholar?hl=en&as_sdt=0,5&q=ultra+wideband https://scholar.google.com/scholar?hl=en&as_sdt=0,5&q=ultra+... [2] Smalltalk and Self Hardware https://vimeo.com/731037615 https://vimeo.com/731037615 [3] Stanford Seminar - Saving energy and increasing density in information processing using photonics https://www.youtube.com/watch?v=7hWWyuesmhs&t=272s https://www.youtube.com/watch?v=7hWWyuesmhs&t=272s [4] Attojoule Optoelectronics for Low-Energy Information Processing and Communications: a Tutorial Review https://arxiv.org/abs/1609.05510 https://arxiv.org/abs/1609.05510