The IEEE 802.11n standard provides 40-MHz channels, improved MAC efficiency, and MIMO.
Which three elements define the 802.11n implementation of MIMO? (Choose three.)
A.
channel bonding
B.
dynamic frequency selection
C.
maximal ratio combining
D.
packet aggregation
E.
spatial multiplexing
F.
transmit beam forming
AEF
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Multiple-Input Multiple-Output (MIMO) is a technology that is used in the new 802.11n specification. A device that uses MIMO technology uses multiple antennas to receive signals (usually two or three) as well as multiple antennas to send signals. Three elements that are implemented in MIMO are:
+ Maximal Ratio Combining (MRC): used by the receiver with multiple antennas to optimally combine energies from multiple receive chains. An algorithm eliminates out-of-phase signal degradation.
+ Spatial Multiplexing: Multiple antennas are used on the transmitting or receiving end. Since the same channel is used, each antenna receives the direct component intended for it as well as the indirect components for the other antennas. However it requires the client to have multiple antennae and be 802.11n compliant.
+ Transmit Beam Forming: The transmitter on a MIMO AP is able to adjust the transmitted signal by modifying the transmitted beam from each of its antenna according to the reflective environment in order to improve the signal to noise ratio (SNR) at the receiver, thereby improving network performance and predictability.
ratio – mutli – beam
MST
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