IEEE802.15.7 Standard Hosein Ahmadinejad, Abolfazl Falahati and Ebrahim Shafiee Dept. of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran ho_ahmadinejad@elec.iust.ac.ir, afalahati@iust.ac.ir, Shafiee_e@elec.iust.ac.ir Abstract— Visible Light Communication (VLC) is one of the most efficient way of wireless data transmission that has attracted a number of researchers. In this paper, a simplex VLC system standard employing a Digital Signal Processor (DSP) chipset is implemented. This system is compliant with a physical layer regarding IEEE802.15.7 PHY1 modes. It is tried to use low- cost hardware with a suitable performance for short distance VLC communication. Bit Error Rate (BER) performance of 4.462Kb/s and 70.92Kb/s is measured at different distances. Keywords— Visible Light Communication, IEEE 802.15.7, Digital Signal Processor I. INTRODUCTION So far, many VLC implementations are observed based on the aforementioned standard. These implementations are grouped into three categories. These categories are Software Defined Radio (SDR)-based, Application Specific Integrated Circuit (ASIC)-based and configurable device-based such as FPGAs and DSP chipsets [12]. SDR based are very suitable for performance evaluation of the system but they cannot be commercialized. In [11, 12] two different implementations system design based on SDR devices are described. ASIC- based implementations such as the one in [13] have complications too, for instance, limit cross-functionality and configuration are not possible. By using configurable devices such as DSPs and FPGAs, we can perform a real-time test by changing the configuration. Also, such devices are suitable for commercialization [14, 15]. The main problem that exists in many of such implementations is high hardware costs, so, this paper try to use a good performance low-cost hardware for implementation of simplex VLC system based on IEEE802.15.7. The rest of this paper is organized as follows. In section Ι IEEE802.15.7 standard in the physical layer is introduced. Section Ι describes software and hardware components of the practical system, and in section V, we present the full system Bit Error Rate (BER) results and performance evaluation and finally, section V reveals the paper conclusion. II. IEEE802.15.7 STANDARD IEEE802.15.7 is a standard for visible short-range communication that a large number of implementations are based on. This standard supports three physical layer types that are PHY1, PHY2, and PHY3. The PHY layers are responsible for many tasks such as activation and deactivation of VLC transceiver, Wavelength Quality Indication (WQI) for the received frames, channel selection, data transmission and reception, error correction and synchronization [10]. PHY1 is used for low data rate outdoor communication. This type supports up to 266.6 kb/s data rate. It utilizes On-Off Keying (OOK) or Variable Pulse Position Modulation (VPPM) as modulation schemes. Concatenated coding (Reed Solomon (RS) and Convolutional Code (CC)) are employed for error Design and Implementation of a Visible Light Communication and Coding System based on To overcome the increasing demand for wider bandwidth, employing visible light spectrum can become a solution. The most important features of this spectrum are the use of Terra Hz license-free bandwidth, no interference with sensitive electronic equipment, simple front-end device, and the possibility for integration into existing lighting infrastructure [1]. The main elements of visible light communication (VLC) are LED devices. Unlike laser diodes, signal phase in LEDs cannot be used for data communication. Therefore, to encode data at transmission, intensity modulation and direct detection are used [2]. In general, communication through light is known as light fidelity (LiFi). Indeed, the new heterogeneous wireless network in full-duplex communication is introduced by LiFi. The simplified model of a LiFi system is known as VLC. In VLC, Line Of Site (LOS) propagation is dominant [3]. This phenomenon has many applications like indoor positioning, cooperation between vehicles, Hybrid WiFi-VLC for internet access, underwater communication and smart sensor network using light [4-9]. IEEE 802.15.7 is the most applicable standard that is introduced for VLC. This standard describes the Media Access Control layer (MAC layer), Physical layer (PHY layer) and does not examine the other layers. In PHY layer, three types of physical layers known as PHY1, PHY2, and PHY3 are defined. According to IEEE802.15.7, the designed system is said to be compatible with original standard if at least one of PHY1 or PHY2 is used in physical layer [10]. The 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC2019) 27-28 April, Shahid Beheshti University, Tehran, Iran 978-1-7281-3767-4/19/$31.00 ©2019 IEEE 106