Multiple-input multiple-output, or MIMO, refers
to the use of multiple antennas both at the transmitter and
receiver.
Another common term for this technology is smart antennas, which performs spatial information processing with multiple antennas. Specifically, degenerate cases of MIMO are single-input multiple-output, or SIMO, when the transmitter has a single antenna and multiple-input single-output, or MISO, when the receiver has a single antenna. A system without multiple antennas at both the transmitter and receiver is single-input single-output, or SISO.
MIMO technology has attracted attention in wireless communications, since it offers significant increases in data throughput and link range without additional bandwidth or transmit power. It achieves this by higher spectral efficiency (more bits per second per Hertz of bandwidth) and link reliability or diversity (reduced fading).
Another common term for this technology is smart antennas, which performs spatial information processing with multiple antennas. Specifically, degenerate cases of MIMO are single-input multiple-output, or SIMO, when the transmitter has a single antenna and multiple-input single-output, or MISO, when the receiver has a single antenna. A system without multiple antennas at both the transmitter and receiver is single-input single-output, or SISO.
MIMO technology has attracted attention in wireless communications, since it offers significant increases in data throughput and link range without additional bandwidth or transmit power. It achieves this by higher spectral efficiency (more bits per second per Hertz of bandwidth) and link reliability or diversity (reduced fading).
History of MIMO
1975,1976
A.R. Kaye and D.A. George and W. van van Etten
created earliest ideas
1984,1986
Jack Winters and Jack Salz
published several papers on beamforming
1993
Arogyaswami Paulraj and Thomas Kailath
proposed the concept of Spatial Multiplexing using MIMO
1994
Patent No. 5,345,599 issued 1994 on Spatial Multiplexing
1996
Greg Raleigh and Gerard J. Foschini refine new approaches to MIMO
technology
1998
Bell Labs was the first to demonstrate a laboratory prototype of SM
2006
MIMO-OFDMA based solutions for IEEE 802.16e WIMAX broadband mobile
standard.
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