Introduction to wifi5:
IEEE 802.11ac is an 802.11 wireless local area network (WLAN) communication standard that communicates through the 5GHz frequency band (which is also the reason for its name). Theoretically, it can provide at least 1Gbps bandwidth for multi-station wireless LAN communication, or at least 500Mbps single connection transmission bandwidth. 802.11ac is the successor of 802.11n. It adopts and extends the air interface concept derived from 802.11n, including: wider RF bandwidth (up to 160MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and higher-order modulation (up to 256QAM). In October 2018, the WiFi Alliance officially announced that it would simplify the name of the corresponding technical standard, and 802.11ac was renamed WiFi 5.
Introduction to wifi6:
IEEE 802.11ax, also known as Wi-Fi 6 and High-Efficiency Wireless (HEW), is a wireless LAN standard that aims to Support indoor and outdoor scenarios, improve spectrum efficiency, and increase actual throughput by 4 times in dense user environments. 11ax supports 2.4GHz and 5GHz frequency bands, is backward compatible with a/b/g/n/ac, and has a maximum bandwidth of 2.4Gbps. IEEE 802.11ax using the 6GHz band will be called Wi-Fi 6E on January 3, 2020.