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MIMO
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MIMO (Multiple-Input Multiple-Output)


MIMO is increasingly being used to provide improved levels of efficiency in many high data rate technologies including Wi-Fi and other wireless and cellular technologies. Essentially MIMO, employs multiple antennas on the receiver and transmitter to utilize the multi-path effects that always exist to transmit additional data, rather than causing interference
MIMO is basically an antenna technology as it utilises a number of antennas to provide the performance improvements.



The uplink from the mobile terminal to the base station employs a scheme called MU-MIMO (Multi-User MIMO). Using this, even though the base station requires multiple antennas, the mobiles (UEs) only need to have one transmit antenna and this considerably reduces the cost of the mobile. In operation, multiple mobile terminals may transmit simultaneously on the same channel or channels, but they do not cause interference to each other because mutually orthogonal pilot patterns are used. This technique is also referred to as spatial domain multiple access (SDMA).





[تصویر:  lte_tut_lte_fig13.jpg]



 : LTE MIMO modes



Single antenna
Transmit diversity
Open loop spatial multiplexing
Close loop spatial multiplexing
Closed loop with pre-coding
Multi-User MIMO, MU-MIMO
Beam-forming & MIMO
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