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 ?
The company's massive MIMO solutions can also support split-mode capabilities, which will enable Sprint to offer both 4G LTE and 5G on the same radio.
Sprint will deploy 64T64R (64 transmit, 64 receive) Massive MIMO radios using 128 antennas working with technology leaders Ericsson, Nokia, and Samsung Electronics.
2, the uplink and downlink channel of the massive MIMO system is same.
The waveform diversity is achieved by the phased- MIMO radar which significantly improves the direct applicability of adaptive arrays for target detection and much enhanced flexibility for transmit beam-pattern design.
Additionally, OEMs and ODMs can build 2x4 and 4x4 or other high-order MIMO configurations in conjunction with carrier aggregation to further enhance the LTE-A user experience in a spectrally efficient manner.
Figure 3 shows the simulated results by the MWS CST and measured results of the proposed LTE MIMO antenna.
Figure 5 shows block diagram of vertical layered structure MIMO OFDM system according to which simulation is done.
Airgo's True MIMO technology has been adopted as the core of the new IEEE 802.
High-speed wireless networking solutions like our new D-Link Super G with MIMO ultimately benefits the consumer in the digital home, enabling next generation speed and range to easily handle emerging, bandwidth-intensive applications, including HD signals and on-line gaming," said Steven Joe, president and CEO of D-Link.
The Massive MIMO beamforming antenna solution consists of a CommScope dual-band, FDD-LTE antenna integrated with two Nokia AirScale radios to deliver 16T16R Massive MIMO in two bands simultaneously.
This new Massive MIMO beamforming antenna solution will be available in mid-2018 for commercial deployment and will be on display in the CommScope stand at Mobile World Congress 2018 in Hall 2, stand 2J30.
11n amendment, MIMO systems were introduced into the WLAN standard [4], such that the latest WLAN standard supports both spatial multiplexing and spatial diversity.