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The newer context-aware applications require many inputs and amongst them the location information is one of the most important. In the near future, the authors see the potential in using wireless sensors deployed inside buildings to support in generating the location information besides their other routine tasks. This paper records the efforts involved in designing and prototyping a centralized indoor positioning system for tracking a target's position. They present an in-depth discussion on the RSSI based positioning algorithms both, range-based and range-free. Considering that the signal strength can be distorted heavily due to multi-path and shadowing, they have proposed the weighing schemes to leverage the credibility of the measured RSSI values.
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