Interesting, glanced through your paper. How do you find real devices behave at constrained channel widths (<20Mhz in 2.4, <40Mhz in 5)? I have a feeling those are not well tested scenarios :)
All 802.11n devices supporting the 5G band support at least a bandwidth 20 MHz (as well as 40 MHz). In addition, you can use 5 and 10 MHz as well on some Atheros devices with open source drivers.
