Check it out http://biomedicalengineeringconsultancy.blogspot.com/2013/02/real-time-location-system.html

Depending the size of coverage, your existing wifi system in your institution, the cost of implementing can be huge depending on the number of active and passive tags you are buying.

Make the impossible POSSIBLE. I know we all can and it is the wisdom to distinguish one from the other.

My blog: http://biomedicalengineeringconsultancy.blogspot.sg/