MIMO

(redirected from Multiple-input multiple-output)

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
This "Pre-N" wireless router from Belkin uses two transmitters and three receivers to provide 108 Mbps between its access point and Belkin Pre-N cards in laptops. Introduced in 2004, this was the first "Preliminary-802.11n" system on the market (see 802.11n). (Image courtesy of Belkin Corporation, www.belkin.com)




MIMO Wireless Router
This "Pre-N" wireless router from Belkin uses two transmitters and three receivers to provide 108 Mbps between its access point and Belkin Pre-N cards in laptops. Introduced in 2004, this was the first "Preliminary-802.11n" system on the market (see 802.11n). (Image courtesy of Belkin Corporation, www.belkin.com)
References in periodicals archive ?
ZTE Corporation, a major international provider of telecommunications, enterprise and consumer technology solutions for the Mobile Internet has today jointly exhibited pre-commercial 5G 3D/massive multiple-input multiple-output (MIMO) base stations with China Mobile at Mobile World Congress in Barcelona.
These devices can be easily programmed to produce any combination of waveform and RF transmission, and fully support multiple-input multiple-output (MIMO) wireless applications and other RF techniques useful for military communications.
Following introductory discussion of the Long Term Evolution Advanced standards and the basic principles of channel modeling and radio propagation, chapters detail the properties of the radio channel in main scenarios suitable for 4G and beyond wireless networks, including indoor and outdoor wireless environments, vehicles, multiple-input multiple-output channels, wideband channels, and channels for Body Area Networks.
The Netgear APs support 3x3 multiple-input multiple-output with three spatial streams to deliver up to 50% faster throughput speeds and improved service area coverage.
AirPort Extreme uses a technology called multiple-input multiple-output (MIMO) to transmit multiple data streams simultaneously.
Each part of wireless link--source coding and channel coding methods, radio wave propagation over wireless channels, and single-carrier and multicarrier modulation techniques--are addressed, as are recent standards like WiMAX, the fundamentals of all existing wireless digital systems developed on the basis of certain standards and protocols, and advanced topics like simulation methodology and software radio, turbo coding, spread spectrum communication, orthogonal frequency division multiplexing (OFDM), multiple-input multiple-output (MIMO) systems, and software radio.
The test involves four Multiple-Input Multiple-Output (MIMO) antennas for base-station transmission and mobile-station reception in the 20MHz bandwidth, the maximum under new Super 3G standards.
05 Petabit/s (1015 bits per second) over novel multi-core fiber (MCF) that contains 12 single-mode and two few-mode cores by employing the advanced space division multiplexing (SDM) scheme and optical multiple-input multiple-output (MIMO) signal processing technique.
ZTE Corporation, a major international provider of telecommunications, enterprise and consumer technology solutions for the Mobile Internet, was awarded a GTI excellence award, recognising its innovative pre5G massive multiple-input multiple-output (MIMO) solution.
The xMax cognitive radio system incorporates advanced optimizing technologies that include spectrum sharing, interference mitigation, multiple-input multiple-output (MIMO) and software defined radio (SDR).
Canada) and Valeri Kontorovich (CINVESTAV, Mexico) describe multiple-input multiple-output (MIMO) systems as the most potent technique for increasing the capacity of wireless channels.
UK) outlines techniques for receiver design when multiple signals are available, including optimal and suboptimal signal combining and detection techniques in the context of multiple-input multiple-output (MIMO) systems.

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