I have a wifi deployment with about 60 access points, currently limited to channels 1,6, and 11. This is a college campus, and the residence halls can get quite noisy, from an rf perspective. We typically have about 30 devices per access point, but the kind of traffic the college students expect to use — hd streaming video/netflix, low-latency gaming, and even some p2p file sharing (though we have severe traffic shaping for that at the gateway) — really eats up air time on the access points, and adding more density or pushing users to the 5Ghz space is proving difficult.
I'm considering breaking with tradition, and using either channels 1,4,7, and 11, channels 1,5,8, and 11, or channels 1,4,8,and 11. The idea is to carefully place it so a channel 1 AP is never near a channel 4/5 AP, a channel 4/5 AP is never near a channel 7/8 AP, and a channel 7/8 AP is never near a channel 11 AP. The extra distance should help reduce the chance of collisions on the over-lapping channels. If done correctly and in conjunction with a few additional access points, it would result in a theoretical 33% increase in available airspace.
Has anyone else tried this? Did it work well? If so, which set of channels did you go with?