CiscoAironetAccessPointDeploymentGuide 
CiscoSystems
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Figure50:HighGainAntenna(AIRANT2480VN)withCoverRemoved
802.11n,SpatialStreams,andBeamforming
Foravideoonthefundamentalsofspatialstreams,seethefollowingURL:
http://www.cisco.com/en/US/netsol/ns767/index.html
MIMO,whichreferstoaradiosystemthathasmultipleseparatereceiveandtransmitpaths,isatthe
heartof802.11n.MIMOsystemsaredescribedbythenumberoftransmittersandreceiversinthe
system.Forexample,"twobyone"or2x1referstoasystemwithtwotransmittersandonereceiver.
(SeeFigure51.)