Changes between Version 25 and Version 26 of Documentation/FAQ

Timestamp:

Jan 25, 2006, 4:32:03 PM (18 years ago)

Author:

Surya Satyavolu

Comment:

—

Documentation/FAQ

@@ -257 +257 @@
 
 On the 64 node grid, I dont think you will be able to achieve isolation even with -12 dBm , you may still need some noise. 
+
+What the physical distance between the nodes on sb9 and those on the main grid? 
+--------------------------------------------------------------------------------
+sb9 is a 64 node grid with dimensions of ~8 m by 8 m. The 400 node main grid is ~20 m by 20 m 
+
+
+What is the network topology of sb9? Can every node communicate with others directly through the wireless channel?
+-------------------------------------------------------------------------------------------------------------------
+Using default power levels on the cards, every node can hear everyone else directly (all are one hop).
+For multihop topologies, we normally use noise injection on sb9. For further details you can refer to the link http://www.orbit-lab.org/userdoc/wiki/Tutorial/UseNoise 
+which will provide a pointer on the kinds of topologies possible with the current noise antenna positions and power levels.
  
+Where is antenna [4,4]?
+-----------------------
+For antenna positions refer to http://www.orbit-lab.org/userdoc/wiki/Tutorial/UseNoise.
+Currently, all four antennas inject noise generated by the Raw Signal Generator uniformly onto the grid. Individual control of power level settings at each antenna will be provided in the next release. The software, however, has the provision to accomodate this. 
+
+Hence, [4,4] is equivalent to [1,1] right now and using any one of these in experiment script will cause noise to be injected from all four antennas.
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