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Definition: 802.11ah

An IEEE Wi-Fi standard providing low-power, long-range wireless transmission for smart home and IoT (Internet of Things) devices. Also called "Wi-Fi HaLow" (pronounced "hay-lo") and employing cognitive radio techniques, 802.11ah transmits up to one kilometer, considerably more than regular Wi-Fi.

Similar to 802.11af
The 802.11ah and 802.11af standards both penetrate walls like over-the-air TV signals. However, 11ah transmits at 900 MHz in the unlicensed frequency band, whereas 802.11af operates in the TV white space bands. See 802.11af, 802.22 and cognitive radio.