Node md2 is a ​Medium Node located on the second floor of the Mudd Building at Columbia University, overlooking Amsterdam Avenue. The ​omni-directional antenna has line-of-sight to the majority of Amsterdam Ave. between 116th St. and 122nd St., as well as to parts of 120th St. and 119th St. headed east.

Coverage

​Coverage measurements are currently being performed in the area around md2. In total, around 100 measurements have been taken on sidewalks in the area spaced by roughly 5m-spaced. The measurement results are presented below.

Figure 1: Coverage measurement results for md2.

These measurements demonstrate an RSSI of around -85 dBm at a 300 m straight-line distance, even in the presence of multiple buildings blocking line of sight. As would be expected, the locations close to the node experience a high RSSI an hence high SNR.

Of particular note are the measurements in the southeastern area. This area is not only shadowed by several buildings, but is also outside of the beam width of s3-lg1's antenna. This demonstrates that s3-lg1 provides coverage for a significant area of the Columbia campus, making it useful for experiments undertaken in this area.

To-Do

Measurements on Broadway (the street to the east of Figure 1)

Measurements further to the south towards the Butler Library.