A single high-speed Wifi network in a large house?

Question

WiFi

Country house 3 floors (450 sq.m, concrete-metal walls), the connection from the provider to the house goes at a speed of 1 Gb / s, then there is a switch, and from it the wiring to the rooms. On the 2nd and 3rd floors there is one ASUS rt87u each, on the 1st floor there is an ASUS RT-AC3200 (on all the latest Asus firmware) - all are configured in access point (AP) mode. The essence of the problem, near the routers, the Wifi signal is just fire 418.26 Mb / s, but it’s worth going behind 2 walls from the router and drops to a dull 18.76 Mb / s. What would you advise to do so that there is a single network with a speed of at least 50 Mb / s throughout the house? Thanks in advance Screenshots of
measurements: https://yadi.sk/i/R8jWRyQFjQseh / https://yadi.sk/i/HkAdlFyxjQsej / https://yadi.sk/i/z_xUuhVYjQsem Measured on MBP15(Inch) 2015.

Answer 1

Spread the frequencies of the AP (specify explicitly), place the AP more "staggered", (the bottom line: when at the 1st level the client moves beyond 2-3 walls, then he catches a signal from the AP of the 2nd level through 1-2 walls (floor / ceiling).
Well, of course an option to add a couple of APs. Try out the modes a / b / g / n / ac forcibly.
PS By frequencies, I mean channels, but the word frequency is more appropriate in this context.
Here is additional information that will be useful habrahabr.ru/post/149447

Answer 2

Unified high-speed Wifi network in a large house

If you need a single network with continuous roaming (for example, a person walks around the house with a smart phone, talks on Skype, shows interiors and at the same time the connection does not break when switching from one access point to another) - install professional equipment. It consists of a controller and managed access points. For example, UniFi or similar equipment from Cisco. And even better - find a specialist or a company that will do everything on a turnkey basis.