Program for designing Wi-Fi networks

Question

Computer networks

Please advise a program (Free, or that would have the possibility of uncircumcised functionality in the demo version for 30 days) for designing Wi-Fi networks.
It is necessary that it would be possible to load the plan of the building (office), place access points on it, indicate the power of the transmitter receiver, directionality, etc. and as a result gave out the level of coverage on the plan of the office.
P.S. I understand that free programs will not give a real result (in principle, it is not needed in this case).

Answer 1

And how does the program calculate how your signal will attenuate in concrete walls?

Answer 2

look towards Heatmapper.
And so I used wavemon under Linux in a warehouse of 5000m ^ 2. made some kind of map manually - logged signal levels in potentially weak places