The packet reception rate is the percentage of packets transmitted by a sender that are
actually received at the receiver.

Program a sender to send 100 messages to a receiver and measure the packet reception rate
(PRR) varying the distance between the sender and the receiver for
(a) indoor environment
(b) outdoor environment

Also measure the packet reception rate when the sender and the receiver are on the human body. 
You can vary the receiver position (eg. forehead, wrist, ankle).

You may have to adjust the radio transmit power to confine the transmission range to the area 
in which you are conducting measurements.

Plot the packet reception rate (y-axis) vs. distance (x-axis) for both environments.

For the indoor and outdoor environments:
What is the effective communication range? (packet reception rate > 90%)
What is the transitional communication range? (packet reception rate at least 30%).

Submit a write-up with the results of the above experiments.