With the rapid development of mobile internet, Location-Based Services (LBS) in large public indoor places is becoming increasingly popular. In such an indoor location, the Received Signal Strength Indicator (RSSI) is often used as an estimated measure of the power level that an IoT device is receiving from Wireless Access Points (WAPs). However, when the distance from the source is increased, the signal gets weaker and the wireless data rates get slower, leading to a lower overall data throughput.
An overview of indoor localization
Techniques for indoor localization
Several indoor localization technologies have been proposed to date based on measuring techniques such as ultrasound, infrared, image, light, magnetic field...