3 ms·

Wi-Max or alternatives like DIY long range Wi-Fi, cannot have both 10 miles (~15 km) range and high throughput. At the very minimum because earth curvature, and

Wi-Max or alternatives like DIY long range Wi-Fi, cannot have both 10 miles (~15 km) range and high throughput. At the very minimum because earth curvature, and also because the radio signal has to go right through the moisture in between the sender and receiver. I came up a few years ago with the idea that it would be possible to use the mesospheric layer as a passive relay for communications at 40 miles range in desert areas. This even during daylight. It is inspired by the "laser guide star" in astronomy with coding à la 802.11 (Golay/LDPC). More about it here: https://padiracinnovation.org/2017/01/10/mesosphere-light-scattering-as-cell-tower-substitute/ https://padiracinnovation.org/2017/01/10/mesosphere-light-sc...

analognoise 10y ago
Sure you can, you just need a bigger tower; you can get gigabit speeds with microwaves, no sweat, very directional too. Signal loss due to moisture? Up the power. It doesn't work? Use more power, or add 5 feet to the tower and try again. Remember, if brute force isn't working, you aren't using enough of it. BTW: I like how you kinda gloss over the advanced math for atmospheric corrections. The idea is interesting, though.
- JPLeRouzic 10y ago
  Thanks for having read the stuff. * About the horizon problem: You need a tower which is 90 meters (270 feet) high to reach a 40 km receiver. It exists but it is pretty costly ... and hugly. * About the power problem, this is regulated. For Wi-Fi I think it is around 80mW. It is not much. * About glossing on math. You are right about it, but after all this is well known: The idea is used heavily in astronomy exactly for this purpose since 10 years. No need to reinvent what more gifted people have already invented.
- 725686 10y ago
  "if brute force isn't working, you aren't using enough of it" You just made my day with that phrase.

analognoise 10y ago

Sure you can, you just need a bigger tower; you can get gigabit speeds with microwaves, no sweat, very directional too. Signal loss due to moisture? Up the power. It doesn't work? Use more power, or add 5 feet to the tower and try again. Remember, if brute force isn't working, you aren't using enough of it. BTW: I like how you kinda gloss over the advanced math for atmospheric corrections. The idea is interesting, though.

JPLeRouzic 10y ago
Thanks for having read the stuff. * About the horizon problem: You need a tower which is 90 meters (270 feet) high to reach a 40 km receiver. It exists but it is pretty costly ... and hugly. * About the power problem, this is regulated. For Wi-Fi I think it is around 80mW. It is not much. * About glossing on math. You are right about it, but after all this is well known: The idea is used heavily in astronomy exactly for this purpose since 10 years. No need to reinvent what more gifted people have already invented.
725686 10y ago
"if brute force isn't working, you aren't using enough of it" You just made my day with that phrase.