输入指令  echo 0x3E> /proc/net/rtlXXXX/wlan0/chan_plan   rtlxxx改成对应的wifi模组型号

a/n模式20带宽 
ctrl_interface=/var/run/hostapd
interface=wlan0
driver=nl80211
ssid=Your_SSID
hw_mode=a
channel=36
ieee80211n=1
wmm_enabled=1
ht_capab=[HT20]
a/n模式40带宽
ctrl_interface=/var/run/hostapd
interface=wlan0
driver=nl80211
ssid=ap_test
hw_mode=a
channel=36
ieee80211n=1
wmm_enabled=1
ht_capab=[HT40+][SHORT-GI-40]
lsmod 查看加载的模块
rmmod 88x2cs  卸载wifi模块
ac模式需要在加载驱动的时候加上参数：insmod 88x2cs.ko rtw_vht_enable=2

ac模式20带宽
ctrl_interface=/var/run/hostapd
interface=wlan0
driver=nl80211
ssid=ap_test
hw_mode=a
channel=36
ieee80211n=1
ieee80211ac=1
ht_capab=[HT20+]
ac模式40带宽
ctrl_interface=/var/run/hostapd
interface=wlan0
driver=nl80211
ssid=ap_test
hw_mode=a
channel=36
ieee80211n=1
ieee80211ac=1
ht_capab=[HT40-][HT40+]
Ac模式80带宽
ctrl_interface=/var/run/hostapd
interface=wlan0
driver=nl80211
ssid=ap_test
hw_mode=a
channel=36
ieee80211n=1
ieee80211ac=1
ht_capab=[HT40-][HT40+]
vht_oper_chwidth=1
vht_oper_centr_freq_seg0_idx=42