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This paper investigates methods for link quality measurement of an indoor, time-varying wireless link. Link quality estimates are used for a number of higher-layer functions, including rate adaptation, routing, and topology control. The objective is to rapidly and efficiently estimate the current reliability of an RF link in terms of its packet success probability in the presence of a time-varying channel. This paper compares various approaches to estimating the current Packet Success Rate (PSR), including packet counting and several methods employing physical layer Signal-to-Noise Ratio (SNR) measurements. Among the SNR-based estimators, the paper considers those using a simple moving average, an exponential moving average, and a Yule-Walker predictor of the current SNR.
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