Received power density from Blutooth and 802.11 b

Hi to all,
I would like to get details on the power density of signal received from Bluetooth devices as a function of distance.- for Blutooth in ISm band 2.45 GHz.. I would be glad if anyone could post link to some study paper that discusses this.
Also could anyone post on the received power density as a function of distance for 802.11 b at 2.45 GHz?
I am actually interested in ambient received power density in office spaces for 2.45 GHz... Could anyone post on this too?
Thanking all in advance.
Regards..
Abhishek

This link shows to you how to calculate received power density.
https://ewhdbks.mugu.navy.mil/pwr-dens.htm
For this you have to measure the Average Power and introduce into the formula.
http://www.us.anritsu.com/downloads/...ransmitter.pdf