Orbit > Tutorial > Using Noise Generator

Using Noise Generator in Experiments

For further details on topology formation using noise antennas, please refer to the publication link at the bottom of the page

The main idea is this:

Along with node definitions in the first part of the experiment script, you also define the antenna to be a part of the experiment

The antennas are located here:

• Antenna 1: Between node2-1 and node2-2
• Antenna 2: Between node2-7 and node2-8
• Antenna 3: Between node7-1 and node7-2
• Antenna 4: Between node7-7 and node7-8.

Attached is a template script to use the noise generator. Please use tutorial-noise.rb as a baseline

The configurable parameters are

• channel on which you want to operate: Valid channels are 1..11, 36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157 and 161
• Noise power on these channels: Limits are from -90 dBm to +5 dBm

Here is a template script to use the noise generator

Experiment.name = "tutorial-1a"
Experiment.project = "orbit:tutorial"
Experiment.defProperty('noisePower', -44, 'Noise level injected')
#
# Define nodes used in experiment
#
defNodes('sender', [1,2]) {|node|
  node.image = nil  # assume the right image to be on disk
  node.prototype("test:proto:sender", {
    'destinationHost' => '192.168.1.1',
    'packetSize' => 1024,
    'rate' => 300,
    'protocol' => 'udp'
  })
  node.net.w0.mode = "master"
}

defNodes('receiver', [1,1]) {|node|
  node.image = nil  # assume the right image to be on disk
  node.prototype("test:proto:receiver" , {
    'hostname' => '192.168.1.1',
    'protocol' => 'udp'
  })
  node.net.w0.mode = "managed"
}

allNodes.net.w0 { |w|
  w.type = 'b'
  w.essid = "helloworld"
}

antenna(4,4).signal {|s|
  s.bandwidth = 20
  s.channel = 36
  s.power = prop.noisePower
}
#
# Now, start the application
#
whenAllInstalled() {|node|

  #Then start receiver and sender
  NodeSet['receiver'].startApplications
  wait 30
  NodeSet['sender'].startApplications

  antenna(4,4).signal.on

  # Step noise power from -44 to 0dbm in steps of 4db
  -44.step(0, 4) { |p|

    prop.noisePower = p
     wait 5
   }
  wait 10
  Experiment.done
}