Abstract
Intelligent Transport Systems (ITS) are anticipated to be one of the key technologies for the next decade and their deployment can benefit from the recent developments in the domain of Visible Light Communication (VLC). Light Emitting Diode (LED)-based low-cost VLC is considered in this work to provide a practical approach towards the implementation of an ITS by addressing the major issues of channel noise, free-space optical multipath reflections and interference from light sources. An analytical model is presented for the proposed Multiple-Input–Single-Output (MISO)-based VLC, and simulations are performed to analyze the performance of the system for various transmission distances. Results show that the proposed optimal receiver for 4 × 1 MISO can provide considerable improvement in the bit error rate for the forward error correction (FEC) threshold of 3.8 × 10−3 in the presence of optical interference, and is suitable to support an ITS with an inter-vehicle transmission approach. The comparison of achieved performance with existing solutions for VLC-based ITS depicts that the proposed framework provides much higher data rates, three times longer transmission distance and improved receiver sensitivity.
Highlights
The research interest in Visible Light Communication (VLC) has been boosted since its acceptance by the IEEE 802.15.7 standard to utilize VLC for the Physical (PHY) and Medium Access Control (MAC) layers [1] of the free-space optics systems
The results are shown for (i) a LOS signal which is only affected by the atmospheric attenuation, (ii) a LOS signal with a reflected version from a shiny surface with strong impact, and (iii) when the LOS signal and reflected signal are received along with an interference signal from a neighboring optical source
The transmission is limited to approximately 7 m for such case and the system is unable to provide an appropriate performance with the reflections or interference signal
Summary
The research interest in Visible Light Communication (VLC) has been boosted since its acceptance by the IEEE 802.15.7 standard to utilize VLC for the Physical (PHY) and Medium Access Control (MAC) layers [1] of the free-space optics systems. Visible nature of LED-based communication are considered as distinguished advantages of this technology over RF counterparts [15,16,17], the provision of reliable transmission even for small data rates is still in question. The need is the systematic characterization of the MISO in VLC for different parameters, based on the commercially available vehicle LEDs. This paper presents a VLC-based MISO transmission model for ITS applications, which will provide significant guidelines for the practical implementation of such systems regarding future technologies. The main research question is to find a solution to the performance degradation of a VLC-based ITS due to the reflections and strong interference signal Such performance-limiting factors have shown previously to limit the data rate, transmission distance and receiver sensitivity. This work focuses on the proposal of a solution based on analytical modeling and simulation analysis using real-time parametric values
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