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The evaluation of wireless research is challenging because signals traveling through the ether are affected by the physical environment, including movement by people and objects. As a result, testbed experiments are hard to control and are non-repeatable. The authors have developed a wireless networking testbed based on digital signal propagation emulation that provides control over the signal propagation environment. The testbed has been in regular use for research and education since early 2007. In this paper, they present measurements illustrating the properties of the emulator testbed. They also compare the results of various experiments on the emulator with simulation results to shed some light on when the increased accuracy of the emulator testbed is important.
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