Abstract
In wireless positioning systems, there are several techniques and features for location estimation of device or user. Global navigation satellite system (GNSS) is representative, but because of some advantages, Bluetooth low energy (BLE) beacon devices are also attracting attention as an alternative of conventional positioning systems. It is the reason that BLE beacons are small, inexpensive and power-efficient device that appropriate for internet of things (IoT) which is a promising future technology. However, there is a problem that the received signal strength (RSS) is not stable but fluctuating. Moreover, these RSS measurements are measured quite differently in same distance by beacon device, even the beacons are from the same manufacturer. We call this problem in RSS bias problem, and we proposed a method how to find the bias level and how to compensate these biased RSS measurements.
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