Enhancing Indoor Localization System Based on Visible Light Communication

Abstract

Rapidly growing in the demands of mobile users leads to an expansion in the need for alternative innovations‎. So, wireless ‎communications based on ‎ ‎Visible Light (VL) have lately become popular to support Radio ‎Frequency (RF) technology. This is because of ‎its advantages such as its availability everywhere, ‎high Bandwidth (BW) and security, ‎privacy, free license, ‎and does not interfere to RF communication. ‎Visible Light ‎Communication (VLC) ‎depends on the VL spectrum ‎for communication, which has wavelengths of 380 to ‎‎780nm. It ‎utilizes Light Emitting Diode (LED) or Laser Diode (LD) ‎as a ‎Transmitter ‎‎(Tx) and Photodetector (PD) or image sensor as a Receiver (Rx).‎‏ VLC is ‎used in different applications, one of the most important applications is ‎indoor ‎localization. One of the localization methods is a two-step positioning method in which the localization process is performed in two steps: 1) Estimating ‎distances ‎between multiple reference points and a target. 2) Determining ‎the target ‎position from these ‎estimated distances.‎‏ The required distance can ‎be ‎obtained based on several methods like Received Signal Strength ‎Indication ‎‎(RSSI), ‎Time of Arrival (TOA), Time Difference of Arrival ‎‎(TDOA), and Angle ‎of Arrival (AOA) method‎.‎ Also, several techniques are used to get the ‎target position, including proximity detection, geometric, and fingerprinting method.