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Taking advantages of off-the-shelf cloud platform services, rather than maintaining a private database for logging the data from sensors, can significantly reduce labor and equipment costs for using a reliable database system. In this study, we present an inexpensive (less than 30 USD) embedded gateway with mobile network connectivity that can talk directly to cloud storage service providers, such...
In this paper, a linear method is proposed to determine the distance according to RSSI, which avoids the traditional disadvantages of low effectiveness, high cost greatly. And two measures, first and second filtering, are taken to discard all the incorrect information and improve the accuracy for location.
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