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EE Times offers a long tutorial in MIMO: This three-page online article spells out the various methods by which multiple antennas are used to achieve distance, robustness, and increase throughput by making use of multipath reflection, multiple spatial streams, and beam forming. For instance, MIMO could be used to increase distance through beam forming, which improves signal clarity to a particular receiver. This was the key technology underlying the Vivato switch, by the way.
Spatial multiplexing allows multiple streams of data to simultaneously use the same frequencies in the same space by following different spatial paths that a receiver can differentiate. Robustness can be achieved by sending the same data over multiple paths improving the chances of reception without error.
The writer concludes that MIMO will find its way into all RF designs because of the many ways in which it can improve the efficiency and utility of spectrum.
Posted by Glennf at March 14, 2006 1:49 PM