Can anyone give a suggestion on inclusion of MIMO technology in wireless sensor networks for increasing efficiency?
What kind of efficiency are you aiming for? WSNs do not require large throughput, and putting more costly hardware on sensor motes such as MIMO radios seems to be contradicting the idea of low-power WSNs.
Maybe thos article could help http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=4699765&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D4699765
What kind of efficiency are you aiming for? WSNs do not require large throughput, and putting more costly hardware on sensor motes such as MIMO radios seems to be contradicting the idea of low-power WSNs.
It's well known that some forms of diversity in the wireless channel are beneficial. For example, antenna diversity is relatively inexpensive and yet can enhance link reliability with indoor radio links. Antenna diversity is an available feature in some low-power radio chips nowadays.
MIMO techniques are designed to increase spatial capacity, bringing simultaneous and distinct data streams to multiple users by employing sourcecoding in PHY, at the cost of higher complexity. Given that the datarate of sensor nets is relatively low, as Matthias pointed out, this complexity (e.g. computational overhead) is in general harder to justify.
However, future LTE releases will certainly entertain sourcecoding for low-power wireless in long-range single hop wireless networks for sensing (+control) applications.
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