Multiple Input Multiple Output

Communications engineering. This transmission technique for wireless communication uses several antennas for the sender as well as for the receiver. All antennas transmit or receive in the same frequency range. The output power is split to all antennas and the signal is distributed through all of them. The incoming power at the receiver is higher with multiple antennas than with one, because the powers of the individual devices accumulate. Each radio transmission has the problem of reflection and shadowing effects, for example by buildings. When distributed via several antennas the signal propagates on different paths and the attenuation and deletion is different for each path. Therefore the error free reconstruction of the original signal is easier. With this technique the receiving quality, the range and the possible data rate are increased.

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