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The dartmouth/zigbee_radio dataset (v. 2008-01-07)  >  the Soccer_field traceset

There are 2 traces in this traceset
download the Soccer_field.tar.gz file
from a CRAWDAD mirror:  US UK AU
type="gz" size="4.0KB" md5="68601c40e2ffeca17ff3062584d7a99c"
last modified
2008-01-07
reason for most recent change
the initial version.
short description

Traceset of outdor experiments in a soccer field measuring the radio characteristics of 802.15.4 mobile person-to-person communications.

description

The traceset contains results from outdoor experiments in a soccer field away from obstacles and radio interference to get insights into the radio characteristics of mobile 802.15.4 person-to-person communications.

release date
2008-01-07
date/time of measurement start
2007-08-12
date/time of measurement end
2007-08-19
methodology

We perform this experiment in a soccer field out of town away from obstacles and radio activity to minimize any external source of interference and perturbation on the measurements. The soccer field is in a rural setting and not in a town. The transmitter sends 18 byte long packets as fast as possible and the receiver retrieves and stores the RSSI (Received Signal Strength Indicator) and LQI (Link Quality Indicator) from each packet received from the sender. We also record the throughput of the sender measured at the receiver.

We draw concentric circles with different radius on the ground, the center being the position of the sender node during the measurements. The radius are: 5, 10, 20, 30, 40, 50, 60 meters. Along the circumference of each circle we place equally spaced markers that identify the distance walked along the circles. The experiment consists of a stationary person standing in the center of the circles wearing a necklace mote and facing a fixed direction while the other person walks along each circle wearing a necklace mote as well.

Each time the person carrying the receiver passes by a marker the user button on the receiver mote is clicked and a counter, which represents an abstraction of the distance walked along the circle, is incremented.

Every RSSI and LQI sample is stamped with the latest marker value which means that the RSSI, LQI, and throughput values are stored in bin structures identified by the number of markers minus one. The RSSI, LQI, and throughput values for a position denoted by i in the circle are an average of the RSSI, LQI, and throughput values between position i and i+1 (assuming the receiver moves according to the i to i+1 direction). This way we are able to produce a 360 degrees RSSI, LQI, and throughput map around the transmitter.

To have a set of comparison points we also perform LoS (Line of Sight) measurements between the transmitter and the receiver where the transmitter is placed in the center of the circles in such a way so there are no obstacles in the proximity and the transmitter and receiver are lifted 1.5 meters above the ground. The receiver is slowly moved along the concentric circles keeping the LoS condition with the transmitter. The receiver was ~1 meter far away from the person carrying it. This way we obtain 360 degrees LoS maps around the transmitter for throughput, LQI, and RSSI measured at the receiver.

 the dartmouth/zigbee_radio/Soccer_field/LOS trace
 the dartmouth/zigbee_radio/Soccer_field/people trace
 how to cite this traceset