As we know, IEEE 802.11 a/b/g/n is the set of 802.11 a, 802.11 b, 802.11 g, 802.11 n, etc. these different wireless protocols are all evolved from 802.11 to implement wireless local area network (WLAN) Wi-Fi computer communication in various frequencies, here is the difference between these profiles:
IEEE 802.11 a:
High speed WLAN profile, the frequency is 5GHz, the maximum speed up to 54Mbps (The actual use rate is about of 22-26Mbps), but not compatible with 802.11 b, the distance covered (approx.): 35m (Indoor), 120m (outdoor). Related WiFi products：QCA9377 High-End Bluetooth & Wi-Fi Combo RF Module
IEEE 802.11 b:
The popular WLAN profile, 2.4GHz frequency.
The speed up to 11Mbps, 802.11b has good compatibility.
Distance covered (approx.): 38m (indoor), 140m (outdoor)
The lower speed of 802.11b makes the cost of using wireless data networks acceptable to the public.
IEEE 802.11 g:
802.11g is an extension of 802.11b in the same frequency band. Supports a maximum rate of 54Mbps.
Compatible with 802.11b.
Distance (approx.): 38m (Indoor), 140m (outdoor)
IEEE 802.11 n:
IEEE 802.11n, the improvement of higher transmission rate, the basic rate is increased to 72.2Mbit/s, the double bandwidth 40MHz can be used, and the rate is increased to 150Mbit/s. Support Multiple-Input Multi-Output (MIMO)
Distance (approx.): 70m (indoor), 250m (outdoor)
Maximum configuration goes up to 4T4R.
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