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Overview
Where is MIMO used: Wi-Fi, WIMAX, LTE
SDMA – spacial division multiplexing (multiple access?)
Antennas – radiation pattern, polarisation
Channels – indoor vs outdoor
Polarisation
• Defined in terms of electric field
• Often referenced to the earth
• Linear
• Circular
• Elliptical
• Cross pol gain
Channel – indoor vs outdoor
• Assume BER of 1E-4
• Then– Outdoor SNR = 8dB– Indoor SNR = 34 dB
• Thus indoor signal must be 400 times stronger (26 dB) for similar performance
MIMO
• Multiple input multiple output
• SDMA is a technique which attempts to send multiple streams of data over a link using the same frequency resource
• SDMA is more multiplexing than multiple access