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Location methods of users in WLAN are being studied because of they can provide information to other applications to taking better decisions and improving their performance. Location methods should be designed to obtain high accuracy and low computational cost. However, it is not an easy task to achieve due to high accuracy requires many calculations. In this paper, we present a location system for IEEE 802.11 infrastructure networks based on probability distributions that uses trilateration technique to determine a starting point of search. Once the starting point is inferred the search area will be limited the closest locations to this point.

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