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This paper records the experimental results concerning the repeatability of illinois Wireless Wind Tunnel (iWWT), a testbed for experimental evaluation of wireless networks. The results show that even in the anechoic chamber, the repeatability of experiments can still be affected by some factors. These factors include randomness of protocol, imprecise position of devices, etc. The illinois Wireless Wind Tunnel (iWWT), which is proposed in, is implemented in an electromagnetic anechoic chamber, with the following two properties: signal outside the chamber cannot interfere the devices inside the chamber, and signal inside the chamber is absorbed by the wall and thus cannot be reflected.
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