wifi:
ieee 802.11a,ieee 802.11b, ieee 802.11g, ieee 802.11n, ieee 802.11ac, ieee 802.11e,, ieee 802.11i
802.11b: 11, 5.5, 2, 1 mbps
802.11g: 54, 48, 36, 24, 18, 12, 9, 6 mbps
802.11n: mcs 0 to 7 for ht20mhz ;mcs 0 to 7 for ht40mhz 802.11ac: 866.7mbps
802.11b(dsss) : cck, dqpsk, dbpsk
802.11 g (ofdm) : 64 qam, 256 qam, qpsk , bpsk
wifi 2.4ghz: 1 1: (ch. 1-11) – united states
1 3: (ch. 1-13) – europe
1 4: (ch. 1-14) – japan