Not just signal strength, but also time-delay (turnaround time, extended by distance) would be in play.
WiFi performance depends on nodes being close enough for their reply to reach the AP soon enough, else the AP considers the packet lost, and has to fallback to retry. That would mess up the ability to have more than one node using the AP.
Like speed of light? 
Yes, exactly. Circuits in computer mainboards have timing issues (and compensating circuit traces) when running in the GHz range.
GPS triangulates using the phase-shifts of individual signals, all traveling at C, and it can tell if you move a few feet.
WiFi, in order to provide best speed to multiple nodes, has to be picky about maximum response times. You may get the signal strenth to reach (e.g. using high-gain or directional can-tennas) but the timing would be affected. Think of: CTS timing, and collision avoidance stuff.
Don't take my word for it - it'll be in the specs for 802.11 and the subsequent extensions.
Thanks for sharing the insight!
Indeed it seems that there’s only 25us or so for acknowledgement in 802.11a (as referended by https://gitlab.com/nsnam/ns-3-dev/-/issues/41 ).
That would seem to imply that there is a hard protocol limit at around 5km, regardless of processing speed, gains and power levels …
Use a cell tower.
This seems good idea along with what I was thinking already
Planning to host an array of CPE 220 on a pole like structure, they will beam 360 degree (13km long range radius).
advantage here is that there wont be any obstruction while connecting.
Whichever location I want to cover, will setup another CPE 220 as a client node which will point upwards to the top of pole.
Only question for now is
)thanks,
nitin sawant
[WiFi, in order to provide best speed to multiple nodes, has to be picky about maximum response times. You may get the signal strenth to reach (e.g. using high-gain or directional can-tennas) but the timing would be affected)]
I would guess thats what the distance setting is supposed to compensate for. I know little about what its doing, when you specify the distance between stations.
Now, as to how far you can adjust for, I dont know that either.
Ive heard its not for the tens of feet kind of distances, possibly more negative than beneficial in that case. And Ive heard it used positively by someone a few km from an AP, and it seemingly improving the thruput.
I also remember people doing many miles point to point, back in the day when wifi and net connections were rare. Longer timeouts on b and g wifi, less adjacent station contention in rural point to point? Just 2 station point to point is much eaiser, of course.
Anyway, looking into distance compensation may be helpful for this long length type of operating.
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