MIMO

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MIMO

(Multiple Input/Multiple Output) Pronounced "my-mo," it is the use of multiple transmitters and receivers (multiple antennas) on wireless devices for improved performance. When two transmitters and two or more receivers are used, two simultaneous data streams can be sent, which double the data rate. Multiple receivers alone allow greater distances between devices. For example, the IEEE 802.11n (Wi-Fi) wireless standard uses MIMO to increase speed to 100 Mbps and beyond, doubling at minimum the 802.11a and 11g rates. MIMO antennas are also used in WiMAX and LTE.

MIMO, MISO and SIMO
The M, S, I and O relate to the air, not the device. For example, multiple inputs (MI) means multiple transmitters send multiple data streams "into" the air. Multiple outputs (MO) means multiple receivers acquire multiple data streams "out of" the air (see illustration below). See 802.11n, antenna diversity, beamforming and HSPA.
ARCHITECTURE AND ADVANTAGES OFMULTIPLE ANTENNA TECHNOLOGIES                       Compared to Single                          Antenna (SISO)                          Technologies                          --------------      Transmit  Receive   DataType  Antennas  Antennas  Rate  Distance

 MIMO  Multiple  Multiple    >     >

 MISO  Multiple  Single      =     =

 SIMO  Single    Multiple    =     >

 M = Multiple   S = Single
 I = Input      O = Output



MIMO Wireless Router
In 2004, Belkin introduced the first 802.11n wireless router with multiple transmit/receive antennas (see 802.11n). (Image courtesy of Belkin Corporation, www.belkin.com)




MIMO Wireless Router
In 2004, Belkin introduced the first 802.11n wireless router with multiple transmit/receive antennas (see 802.11n). (Image courtesy of Belkin Corporation, www.belkin.com)
References in periodicals archive ?
The legacy control packets are wrapped in the control wrapper frame, which include information about the ongoing modes of transmission (MIMO or SISO).
In SU-MIMO, the benefit of MIMO processing is achieved via the coordination of processing among all transmitter or receiver antenna elements.
The analysis can also be extended to investigate the overall system performance when implementing massive MIMO systems [21].
Importantly, when compared to standard MU-MIMO transmission schemes, the proposed scheme is capable of maximizing the available MIMO capacity, especially when each receiver node has a different data rate or data length in each TXOP.
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Naguib, "From theory to practice: an overview of mimo space-time coded wireless systems," Selected Areas in Communications, IEEE Journal on, vol.
Salzer, "Shifting the mimo paradigm," Signal Processing Magazine, IEEE, vol.
Okada, "Experimental evaluation using 16 x 16 multiuser mimo testbed in an actual indoor scenario," in Proc.
Gerla, "Mimoman: a mimo mac protocol for adhoc networks," in Proc.
Haardt, "An introduction to the multi-user mimo downlink," Communications Magazine, IEEE, vol.
Shin, "Performance characterization of csma/ca adapted multi-user mimo aware mac in wlans," EURASIP Journal on Wireless Communications and Networking, no.