Tren Griffin+ Your Authors @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 + Your Authors

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.  https://www.itu.int/dms_pubrec/itu-r/rec/sm/R-REC-SM.1755-0-200605-I!!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."  https://www.ntia.doc.gov/legacy/osmhome/uwbtestplan/barret_history_(piersw-figs).pdf 

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.  http://ecee.colorado.edu/~ecen4242/marko/UWB/UWB/art_4.pdf 


You can follow @trengriffin.



Bookmark

____
Tip: mention @threader_app on a Twitter thread with the keyword “compile” to get a link to it.

Enjoy Threader? Sign up.

Since you’re here...

... we’re asking visitors like you to make a contribution to support this independent project. In these uncertain times, access to information is vital. Threader gets 1,000,000+ visits a month and our iOS Twitter client was featured as an App of the Day by Apple. Your financial support will help two developers to keep working on this app. Everyone’s contribution, big or small, is so valuable. Support Threader by becoming premium or by donating on PayPal. Thank you.


Follow Threader