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What's the difference between MIMO and Antenna diversity?

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hebu

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Dear all,

As far as I know, the MIMO technique can increase the data thoughput by receiving separate information from different antennas.
And, diversity is used to increase the SNR.

Several questions.
1. Why does the LO phase requires to be synchronized between Primary and Diversity signal?
2. Does MIMO have this requirement as well?
3. Any other difference between MIMO and diversity in terms of RF requirement?
 

antenna diversity means you have a spdt switch, and two antennas, and use some means to determine which of the two antennas is working better at receiving the desired signal. Choosing which antenna might be done by watching the demodulated bit error rate or the AGC level.

MIMO means you have multiple antennas (at least 3), and you simultaneously use ALL OF THEM to reconstruct the best estimate of the desired signal. Often there is virtual antenna pointing and multipath reflection mitigation software involved.
 
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