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
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 ?
a MIMO (Multiple Input Multiple Output): both base station and mobile device are equipped with multiple transmit/receive antennas.
MIMO radar allows for beam forming at the transmit and receive arrays.
Figure 3 shows block diagram of a MIMO OFDM system with 2 transmit and 2 receive antennas according to which simulation is done.
Airgo's True MIMO technology has been adopted as the core of the new IEEE 802.
The D-Link advanced Super G with smart antenna MIMO technology is single ended, which means it communicates with all legacy WiFi wireless devices in a seamless exchange of traffic, while optimizing the network by amplifying the 802.
Bluetest s years of experience deliver a higher degree of accuracy and reliability, and their selection of Spirent s VR5 Channel Emulator confirms our shared commitment to support the industry s urgent need to validate MIMO performance on next generation devices.
Practical Guide to the MIMO Radio Channel with MATLAB examples is an invaluable reference for R&D engineers and professionals in industry requiring familiarisation with the concept, and engineers entering the field or working in related fields seeking an introduction to the topic.
Device migration from Tx and Rx diversity to higher order MIMO
When MIMO OTA tests are performed using an anechoic method, wireless channel emulators apply real-world spatial channel models to the signals that are sent to antenna probes mounted in the chamber.
The MIMO UM-710 boasts a pivoting monitor for either landscape or portrait views, and features 350 cd/m2 brightness with a contrast ratio of 400:1.
OULU, Finland & CEDAR PARK, Texas -- EB (Elektrobit), a leading developer of cutting edge embedded technology solutions for wireless and automotive industries and ETS-Lindgren, a leading provider of electromagnetic measurement solutions announced their partnership on MIMO Over-the-Air (OTA) testing.
OULU, Finland -- EB (Elektrobit), a developer of cutting edge embedded technology solutions for wireless and automotive industries, today announced the industry's first commercially available Multiple-Input-Multiple-Output (MIMO) Over-the-Air (OTA) emulator to increase the performance and data rate of MIMO mobile terminals.