what is MIMO in smart antennas

MIMO (multi input multi output) it is transmission technique that uses multi path fading to increase channel capacity by using more than one antenna, each antenna send different data at same time, in the RX the antennas (number of antennas at the RX must be equal to or greater than the number of antennas at the TX) combine the received signals and data are recovered
Also check this http://www.networkworld.com/details/6830.html
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