International Journal of Science and Research (IJSR) ISSN: 2319-7064 SJIF (2020): 7.803 Volume 10 Issue 6, June 2021 www.ijsr.net Licensed Under Creative Commons Attribution CC BY Unlocking the Potential of Li-Fi for Next- Generation Wireless Communication Geeta Mongia 1 , Gaurav Verma 2 1 Department of Electronics, Bhaskaracharya College of Applied Sciences, University of Delhi, New Delhi, India,110075 Email: geeta.mongia[at]bcas.du.ac.in 2 Department of Electronics and Communication Engineering, IIT Roorkee, India, 247 667 Email: evlsigaurav[at]gmail.com Abstract: Light fidelity, or Li-Fi, is a wireless communication technology that enables secure line of sight communications, efficient connectivity in RF hostile environments, ultra-high transmission data rates, dense and reliable networks for smart cities and nations. Optics and photonics have been important research areas for next-generation communication systems, with Li-Fi being one of them. Although wi-fi is excellent for general wireless coverage, Li-Fi technology is superior for high-speed data transfer in confined areas and data transfer without radio frequency interference. In comparison to Wi-fi, it allows you to connect a lot more devices and transfer data at a much faster rate. Li-Fi offers high efficiency and also a much-secured network system. In this paper, we explored the distribution of power density using Li-Fi technology, a simulation model is described. This paper presents a mathematical analysis of the simulation model to study the variation of power density with a change in height or change in angle between transmitter and receiver. We also tried to optimize the parameters for the best performance of the Trans receiver system. Along with mathematical simulation, we have also shown the data transmission through text and audio using the Proteus Design tool. We could successfully transmit and receive text signals with multiple inputs and multiple outputs (MIMO). We have also presented a prototype for successful audio transmission using Li-Fi technology. Keywords: Light fidelity, Optics, Photonics, Power density, Wireless communication 1. Introduction Digital communication today has revealed an unexpected growth in terms of data transfer rate, noise immune long- distance communication in a cost-effective manner. The major communication technologies rely on the radio frequency spectrum and 4G bands and are at their upsurge at utilization level. The rapid growth in the number of users and the amount of data transferred has led the researchers to explore unconventional methods of communication. Optical communication, which has much greater bandwidth, has been an interesting domain in this respect. At both the academic and industrial levels, there is a lot of research being done on the commercialization of optical or visible light communication systems. Light fidelity, or "Li-Fi" for short, is a more advanced subset of optical communication. It is a fundamental 5G technology [1]. It is not a replacement for or equivalent to wireless fidelity (Wi-Fi), but rather a strategy for developing a future communication method. Li-Fi is a wireless communication technology using visible light. Visible spectrum ranging from 380 nm to 780 nm wavelength, corresponds to the frequency ranging from 385THz to 789 THz [2]. This technology was introduced by German physicist Harald Hass in the year 2011. Visible Light Communication (VLC) is a point-to-point data communication technique [3]. However; Li-FI is bi- directional multiuser communication. Visible Light Communication can be used to complement current RF systems as Li-Fi can give safer networks and faster speeds [4]. The basis for Li-Fi is that it uses light-emitting diodes (LEDs) to convert an electrical signal to optical power. The advantage of using LED is that it is used for communication as well as illumination, hence, creating a completely networked wireless system. At the receiver end photodiodes are connected to convert the received optical power to an electrical signal. Li-Fi allows a device to connect to the internet without using a wire [5]. Figure 1 depicts the working principle of Li-Fi technology in a basic concept block diagram. It comprises a transceiver and the transmission of the medium as light. A Li-Fi system mainly cosists of two parts:Transmitter and receiver. The input signal at the transmitter section is sent through LED as data string of 1‟s and 0‟s (ON & OFF). At the receiver end, a photodiode is used to receive the optical signal from LED and after processing through microcontroller gives the corresponding output electrical signal. As shown in block diagram (Figure 1), both transreciver works as transmitter as well as receiver, this fundamental principle is referred to as duplex communication [6]. Light is used to communicate data in the Li-Fi and VLC systems. The difference between Li-Fi and VLC is that VLC uses unidirectional, low-data- rate point-to-point light communication. Li-Fi is a completely networked, bidirectional, and high-speed wireless communication technology. According to reports, Li-Fi is a combination of Wi-Fi and VLC. The serial communication based prototype implementation is alreasy present in the literature. In this paper, we have presented a Li-Fi system with its implementation for bidirectional data transfer for text and audio data types using MIMO (multiple- input multiple-output). The proposed design implements the parallel communication using Li-Fi approach. This will increase the data rate speed and capacity to manyfolds. We also presented the optimization results for an environment consisting of an LED data source and a photodiode receiver. Paper ID: SR21603224532 DOI: 10.21275/SR21603224532 480