Real-time distance awareness algorithm based on wireless signal strength and accelerometer sensor of smart device in an indoor environment

When mobile devices use the distance between devices in an application, the distance should be measured easily and accurately. The RSSI system can be used to estimate the distance easily and inexpensively because most devices can estimate the received signal strength. However, estimating the distance using a RSSI is difficult due to inaccuracies. Therefore, we propose distance awareness algorithm based on the RSSI and accelerometer sensor suitable for real-time distance estimation in an indoor environment. To evaluate the effectiveness of the proposed algorithm, we tested the distance measurement in an indoor hall environment. The results of this test indicate that the proposed algorithm does not only reduces the inaccuracy of Bluetooth RSSI significantly, but also estimates real-time distance more accurately using an accelerometer sensor.