802.11ad will allow devices to communicate over four, 2.16GHz-wide channels, delivering data rates of up to 7 Gigabits per second, even for mobile devices with limited power, a significant improvement over both 11n and 11ac.
802.11ac should still have 500 mbps speed at distances of 50 meters.
By 2015, 802.11ac and 802.11ad should be the dominant wifi
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