This page lists coverage measurements performed for the COSMOS nodes. The goal is to give experimenters an idea of what coverage each node provides in the testbed area, so experiments may be planned more effectively.

Node Coverage Measurements

• s3-lg1

Measurement Procedure

A uniform procedure is used to measure each node. The procedure utilizes the ​USRP 2974 in each node to transmit 802.11g data packets at regular 100ms intervals with fixed power on channel 1 (2412 MHz). A laptop computer is then used to receive and decode these packets in different locations, with the output provided by the tcpdump command. Each decoded packet reports its received power. Each measurement location is measured for 20 seconds, allowing both an average received power and packet reception ratio (PRR) to be computed over 200 packets.