转载关于WIFI 2.4G上20_40MHz带宽的一篇文章； Abstract—We investigate the impact of 20/40 MHz coexistence on the performance of wireless local area networks(WLANs). To that end, we present simulation results of overlapping basic service sets (BSSs), a 802.11n BSS operating in 20/40 MHz mode and a legacy BSS operat