Ozyegin University is studying LiFi intelligent traffic system to achieve V2X communication [Full text]

Technology LiFi technology utilizes already-laid equipment (ubiquitous light bulbs). By implanting a tiny chip on the bulb, it can become a device similar to an AP (WiFi hotspot), enabling the terminal to access the device at any time. The internet. The current number of light bulbs around the world is about 14 billion baht. Such as street lights on highways, people can easily receive signals from street lamps on high-speed cars.

With the continuous improvement and improvement of LED lighting systems in the automotive industry, researchers from the Optical Wireless Communication Technology Laboratory of the University of Ozyegin in Turkey began to study the intelligent traffic system based on visible light communication (LiFi), which uses visible light to replace the traditional radio protocol to realize the vehicle. Communication between car (V2V) and car and infrastructure, Internet (V2I). V2V System For security applications, the V2I system is primarily designed to support convenient applications including personal communications, mobile office, telematics, location-based information, automotive-related mobile services, live video, and Internet access. V2V and V2I are collectively referred to as V2X. V2X applications can improve safety, vehicle traffic, and energy consumption.

Figure 1: Illustration of Intelligent Traffic System Solution Based on Visible Light Communication (LiFi)

Researchers at the Optical Wireless Communication Technology Laboratory at the Ozyegin University in Turkey at the 2017 NI Technology Summit presented their research and presented a demonstration solution using the NI FlexRIO module based on the Xilinx Virtex-5 and Virtex-7 FPGA devices. A visible optical communication system based on OFDM (Orthogonal Multiplexing) technology is built for the hardware platform. The FlexRIO module realizes functions including channel coding, 4-QAM modulation, and N-IFFT (Inverse Fast Fourier Transform). In addition to the FlexRIO FPGA board as a baseband signal processor, the FlexRIO adapter modules NI 5781 and NI 5772 are responsible for high-speed wideband A/D conversion and D/A conversion, respectively, to enable the transmission and reception of baseband paths for optical signals through LabVIEW and The LabVIEW FPGA Development Tool adjusts the appropriate parameters to enable real-time transmission with far greater performance than traditional CPU-based transceivers.

Figure 2: LiFi system built on NI FlexRIO platform

In addition, the research team has also built a 60 cm x 40 cm x 300 cm atmospheric simulation environment sealed box, and can adjust the temperature inside the atmosphere, wind, fog, humidity and other atmospheric environment to achieve different weather conditions simulation, and set a different sensor Real-time monitoring is performed, and this simulation environment is used for functional testing under different weather conditions of a visible light communication (LiFi) system.

Figure 3: Outside (left) and inside (right) of atmospheric simulation environment system

This demonstration scheme can achieve a data communication rate of up to 50 Mbps at a distance of 70 meters between two vehicles under normal weather conditions. This is related to the position of the photoelectric sensor in the body (mainly the height from the ground). This scheme has obtained NI RF and mobile communication. The category's most influential awards, the team said that in order to enhance system performance will integrate more advanced features such as multiple input / multiple output, adaptive link adaptation and so on.

Original Title Intelligent Traffic New Play: V2X Communication with Visible Light