wiki:Hardware/bDomains/aGrid

Version 6 (modified by Surya Satyavolu, 16 years ago) ( diff )

Back

Centralized Arbitrary Noise Injection Subsystem

This subsystem consists of a central arbitrary waveform generator (Agilent ESG) connected to four distribution antennas through a RF switch. Using this subsystem, users can inject individually controllable noise into the ORBIT grid using the antennas.

Webservice commands

<serviceGroup name="interference">
  <info>Interference injection control service</info>
  <service name="awgn">
     <info>Configures interference injection singal type to AWGN</info>
     <args>
        <arg name="bandwidth" value="noise BW in MHz"/></args>
  </service>
  
  <service name="initialize">
     <info> Resets interference injection subsystem to default state </info>
  </service>

  <service name="set">
     <info>Set global interference injection parameters</info>
     <args><arg name="power" value="noise power in dBm"/>
           <arg name="channel" value="802.11 channel number"/>
           <arg name="frequency" value="interference center frequency"/>
           <arg name="antenna-atten-1" value="attenuation in db"/>
           <arg name="antenna-atten-2" value="attenuation in db"/>
           <arg name="antenna-atten-3" value="attenuation in db"/>
           <arg name="antenna-atten-4" value="attenuation in db"/>
     </args>
  </service>
  
  <service name="start">
       <info>Turn on interference injection</info>
  </service>
  
  <service name="status">
	<info>Show current status of the interference injection subsystem</info>
  </service>
  
  <service name="stop">
        <info>Turn off interference injection</info>
  </service>
  
  
</serviceGroup>

Example

To set AWGN on channel 36 at -30 dBm on antenna1 use the following commands (either through a browser or wget)

  • Step 1: Select AWGN bandwidth (channel bw for 802.11a/b/g is 20 Mhz)
          wget http://instrument1.orbit-lab.org/awgn?bandwidth=20
    
  • Step 2: Set power level to -30 dBm
          wget http://instrument1.orbit-lab.org/set?power=-30
    
  • Step 3: Set channel number to 36
          wget http://instrument1.orbit-lab.org/set?channel=36
    
  • Step 4: Start RF injection
          wget http://instrument1.orbit-lab.org/start
    

At the end of the experiment,

  • Step 5: Stop RF injection
          wget http://instrument1.orbit-lab.org/stop
    

Attachments (4)

  • noiseantenna.png (197.6 KB ) - added by Surya Satyavolu 16 years ago.
  • ORBITGridBD.jpg (114.3 KB ) - added by seskar 10 years ago. ORBIT Grid Block Diagram
  • CAWIS.jpg (70.4 KB ) - added by seskar 10 years ago. Interference Injection Subsystem Block Diagram
  • Massive-MIMO.jpg (163.8 KB ) - added by seskar 6 years ago. Massive-MIMO mini-rack

Download all attachments as: .zip

Note: See TracWiki for help on using the wiki.