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Use of multiple antennas in radio / From Wikipedia, the free encyclopedia

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In radio, multiple-input and multiple-output (MIMO) (/ˈmm, ˈmm/) is a method for multiplying the capacity of a radio link using multiple transmission and receiving antennas to exploit multipath propagation.[1][2] MIMO has become an essential element of wireless communication standards including IEEE 802.11n (Wi-Fi 4), IEEE 802.11ac (Wi-Fi 5), HSPA+ (3G), WiMAX, and Long Term Evolution (LTE). More recently, MIMO has been applied to power-line communication for three-wire installations as part of the ITU standard and of the HomePlug AV2 specification.[3][4]

MIMO exploits multipath propagation to multiply link capacity.

At one time, in wireless the term "MIMO" referred to the use of multiple antennas at the transmitter and the receiver. In modern usage, "MIMO" specifically refers to a class of techniques for sending and receiving more than one data signal simultaneously over the same radio channel by exploiting multipath propagation. Additionally, modern MIMO usage often refers to multiple data signals sent to different receivers (with one or more receive antennas) though this is more accurately termed multi-user multiple-input single-output (MU-MISO).