Tren Griffin @trengriffin I work for Microsoft. Previously I was a partner at Eagle River, a private equity firm established by Craig McCaw. I am on the board of directors of Kymeta. Sep. 15, 2019 1 min read

If your device (e.g. iPhone 11) uses ultra-wide band (UWB) it: (1) operates at power levels below the noise floor; and (2) uses spectrum that occupies a bandwidth greater than 500 MHz. Low power spectral density limits interference with conventional radio.!!PDF-E.pdf 

Radio involves trades: "UWB trades pulse shortness (gaining high signal/symbol rate) in exchange for 1) bandwidth (which becomes wider) and 2) S/N (which is reduced). Each advantage is offset by a disadvantage, the cure for which is another disadvantage." 

Relatively low power limits allowed in use of UWB are both a disadvantage and a benefit since they: 1) restrict applications to relatively short distances, but 2) result in a very power-efficient and low-cost implementations, which preserves battery life.

As in most aspects of life, tradeoffs are inevitable. An ideal wireless system would transmit:

1. a lot of data,
2. very far,
3. very fast,
4. for many users,
5. all at once.

It is impossible to achieve all five attributes simultaneously. C’est la vie. 

You can follow @trengriffin.


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