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This paper presents the design of a localization scheme in wireless sensor networks (WSN) for cattle monitoring applications in grazing fields. No additional hardware was required for distance estimation since, the authors were performed using the Link Quality Indication (LQI), which is a standard feature of the ZigBee protocol. The Ratio-metric Vector Iteration (RVI) algorithm was implemented and modified to work with LQI measurements instead of the usual Received Signal Strength Indication (RSSI). Experimental results show acceptable localization performance given the requirements of usual cattle monitoring applications at low cost and low power consumption.
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