Physical layer design of a robust low-power low-complexity optical wireless sensor system with angular diversity for metal-enclosed environments Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6w924g86c

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  • The desire to apply short-range wireless communication systems to telemetry sensor networks in a metal-enclosed chamber has prompted this study. This thesis will discuss the design of an infrared (IR) communication system for a wireless low-power, low-data- rate sensor network in a metal enclosure. This design requires an in-depth understanding of the environment and how IR will propagate in it. The metal enclosure o®ers the advantage of little background (ambient) lighting noise, which is the main noise source in IR communication. Also, due to the small dimensions of this enclosure, the non-line-of- sight (NLOS) communication will take advantage of the re°ected paths o® the walls. To improve system performance in this di®use NLOS communication environment, angular diversity will be employed and tested. It will be shown that these di®use re°ections are an advantage at low data rates (< 1Mbps), but then become a hindrance at higher data rates (> 10Mbps) due to inter-symbol interference (ISI) caused by channel excess delay. All measurement results, including bit error rate (BER) versus transmitted power, will be presented.
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