Power calculation of receivers signal

Hi! i want to make a circuit with a transmitter and receiver and then i connect the receiver to pc and then i will calculate the power of the transmitter antenna's signals power(actually i ll use bluetooth transmiter and receiver ).But i dont know how to measure the incoming signal's power from transmitter.i saw so many complicated formulas on net but i need something simple(that i can understand)Can anybody help me about this situation. Thanks..

It should be complex. the incoming signal power should be:
( Tx power)+ (TX antenna gain)-(link loss)+(Rx antenna gain).

Thank you..actually my project is "Two-dimensional tracking of a person walking across a room" and monitoring it with matlab..and i decided to use bloutooth to track..is there any other easy way to do it?

search multilateration, triangulation, or interferometry.

or you could just copy these guys:
http://www.iai.csic.es/lopsi/static/...IA-Antonio.pdf

Thanks a lot..for your directions all..