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 ?
At the transport layer, TCP performance over MIMO communications was studied (22).
The advantages of MIMO communication, which exploits the physical channel between many transmit and receive antennas, are currently receiving significant attention (18).
In [17] authors have presented a Pulse Position Amplitude Modulation (PPAM) Space Time Trellis Codes (STTC) for ultra wide band MIMO communications, though at the cost of higher receiver complexity.
Canada) present 11 chapters covering topics such as: fading channels and diversity techniques, capacity and information rates of MIMO channels, space-time block and trellis codes, concatenated codes and iterative decoding, unitary and differential space-time codes, practical issues in MIMO communications and antenna selection for MIMO systems.
An overview of MIMO communications - a key to gigabit wireless, Proceedings of the IEEE international conference on communication, V.
NYSE: KEI), a world leader in advanced electrical test instruments and systems, will broadcast a free webinar titled "Demystifying Testing of MIMO Communications Systems" on Thursday, March 5, 2009.
The book introduces recent developments in MIMO radar in a tutorial manner to stimulate new concepts, theories, and applications on the topic, as well as to foster further cross-fertilization of ideas with MIMO communications.
com/reports/c23115) has announced the addition of Space-Time Processing for MIMO Communications to their offering.
This book presents a balanced and timely introduction to space-time processing for MIMO communications, including highlights of emerging trends, such as spatial multiplexing and joint transceiver optimization.
This valuable resource will appeal to engineers, developers and consultants involved in the design and implementation of space-time processing for MIMO communications.
9 MIMO Communications with Partial Channel State Information (Shengli Zhou and Georgios B.