I used to work on the 4x4 mu-mimo chip. The way we tested was to connect coax cables from one board to another. You could get about 800MB/s out of the link that way. At home, I measured 100MB/s between two boxes in the same room and maybe 15MB/s to a laptop 3 rooms away. The only way to get something better is to cheat on TX power levels. No amount of signal processing can defeat attenuation through a couple of walls.