| Version 22 (modified by , 12 years ago) ( diff ) |
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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 …
Centralized Arbitrary Waveform Injection Subsystem (CAWIS) / Noise Generation
This subsystem 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.
Position of the noise antennas on the big 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. Accessing this url without any other arguments will show it's help page:
Attachments (5)
- noiseantenna.png (197.6 KB ) - added by 18 years ago.
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ORBITGridBD.jpg
(114.3 KB
) - added by 12 years ago.
ORBIT Grid Block Diagram
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CAWIS.jpg
(70.4 KB
) - added by 12 years ago.
Interference Injection Subsystem Block Diagram
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Massive-MIMO.jpg
(163.8 KB
) - added by 9 years ago.
Massive-MIMO mini-rack
- APAMSJ-137.pdf (2.0 MB ) - added by 2 years ago.
