"I've tried search in our site, but none of the posts were related closely to my question."

Well, it's hardly an 8052 question, is it??!!!


Anyhow, here's an off-topic answer to your off-topic question:

There are plenty of such devices available commercially as consumer products, though possibly not using IR; eg, the following are both RF:
http://www.maplin.co.uk/products/details.php?CartID=0209222002121441819&moduleno=27680&modulecode=

http://www.maplin.co.uk/products/details.php?CartID=0209222002121441819&moduleno=29325&modulecode=