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Grid

Block diagram of the ORBIT Grid domain is shown in Figure 1. It consist of 20 x 20 nodes arranged in the grid (20 rows with 20 nodes each) with spacing of 3 feet.

Figure 1: ORBIT GRID

Console, Switches …

Arbitrary Waveform Injection / Noise Generation

The Centralized Arbitrary Waveform Injection Subsystem (CAWIS) consists of arbitrary waveform generator (Agilent ESG) connected through distribution network to four multi-band antennas located in the four corners of the grid. The distribution network enables control over the attenuation of the individual antenna feed. Using CAWIS, users can inject (among other types of waveforms) AWGN signals into the main ORBIT grid and thus create different topologies.

Noise Antennas in the Grid

Figure 2: CAWIS
a.) Block Diagram	b.) Noise injection antenna positions

As most of the Orbit services, CAWIS is a web-based service accessible from main grid console through url: ​http://instrument1.orbit-lab.org:5012/interference. As with other aggregate managers, accessing this url without any other arguments will show it's usage page.