Visible light wireless communication is a communication method in which data to be transmitted is used as a high speed wireless data transmission means using LEDs having a high on / off speed. As the VLC system evolves, the basic research problem is to secure communication reliability and improve performance. Due to the characteristics of visible light wireless communication, communication is performed only in the light reach range, which depends on the light emission angle.This is a big difference. Therefore, in this paper, we applied MIMO (Multiple Input Multiple Output) communication system using the property of several LEDs in general indoor environment, and analyzed the total power and SNR performance obtained from the receiver by changing the emission angle of the transmitter. It was. As a result of the simulation, the SNR depends on the light emission angle of the transmitter. It has been found to have a great influence on the performance and BER performance.In this paper, we assume a rectangular parallelepiped room, illuminate the ceiling and wall of the transmitter LED, and derive a communication channel model in a fixed height environment considering the height of the desk. In an environment where multiple LEDs exist, the reception performance may vary according to the light emission angle of each LED. In this paper, we analyze this performance in MIMO environment. This study is expected to be used as a technique to improve the performance by determining the emission angle and applying MIMO technology to improve the performance according to the communication area of the visible light wireless communication system.Further research on the interference from multiple LEDs is needed. It is necessary to analyze interference scenarios and cancellation techniques that have been studied so far and to find interference cancellation models suitable for sensor networks.
Volume 11 | 07-Special Issue
Pages: 1795-1800