IFAC-PapersOnLine 49-25 (2016) 176–181 ScienceDirect Available online at www.sciencedirect.com 2405-8963 © 2016, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. Peer review under responsibility of International Federation of Automatic Control. 10.1016/j.ifacol.2016.12.030 © 2016, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. Keywords: Visible Light Communication; Smart Home; Twisted Pair; Interworking; Light Emitting Diode; KNX. 1. INTRODUCTION To control the operating and technical functions in intelligent buildings, traditional technology systems are used (e.g. KNX, LON, BACnet) with transmission of wireless information radiofrequency (RF) transmission via the bus line (TP) or power line (PL). All three control network technologies – power line, wireless, and wire line based - have significantly improved in transmission speed, reliability and interoperability through standardization efforts over the past ten years. In general, control networks based on power line communication and wireless transmission are dominant in residential home automation due to lower component prices and installation cost (Dvorak, 2014). Wire line control networks, on the other hand, are found in the premium residential segment and in industrial building control applications (Kyas, 2013). Today, a need has appeared on the market to create new ways of transmitting information in Smart Home in terms of ensuring higher data transmission speed, ensuring the security of data transmission by eliminating the possibility of wiretapping and attacks on the technological network, ensuring interoperability with progressive technological concepts such as the Internet of Things (IoT) (Granados, 2015), possibly with a view to ensuring compliance with the conditions of hygiene standards for healthy housing of the population. These problems could be resolved by networks using a VLC (Visible Light Communication) optical interface. With the progress of technology of LED (Light Emitting Diode) production, their functionality has been expanded from signal lights on technological devices to their use as light sources for lighting elements of interiors and exteriors of buildings and apartments. The current idea at present is using LEDs in lighting elements, not only for illuminating the space inside buildings, but also as an optical interface for data communication (IEEE 802.15.7) in buildings and flats. Optical fibre-free networks for indoor spaces of occupied space can be designed with direct visibility (LOS - Line of Sight) or indirect visibility (NLOS - Non Line of Sight). Communication using light in the visible spectrum transmits data by modulating radiated light power, such using imperfection of the human eye, which cannot record such fast actions (Koudelka, 2014). A smart home scenario is characterized by enabled intelligent interworking of various wireless and wired technologies to provide inhabitants with ease of use of appliances, while creating a personalized and safe ambience space. Kumar (2014) proposes a scenario for integrating visible light communications (VLCs) into the smart home scenario and a conceptual supporting architecture for its deployment. Bouchet (2011) developed a visible-light- communications system based on DMT signal processing and an adapted MAC sublayer for Wireless Optical Network in a Home Network (Bouchet, 2010). Visible Light Communication (VLC) system based on white LEDs has emerged as an eco-friendly IT green technology using THz visible light spectrum in provision of both lighting and wireless access. The integrated system of VLC and PLC (Power Line Communication) is a smart way of fulfilling the premise of broadband access for home networking, while providing efficient and low-cost lighting (Pujapanda, 2013). The future of VLC systems depends on the ability to fabricate low cost transceiver components and to realize the promise of high data rates. Rajbhandari (2015) reports the design and Abstract: In connection with the development of the technological concepts Smart Home (SH), Smart Metering, Smart Grids, the Internet of Things (IoT), new ways of transmitting information using a suitable communication medium are looked for in the above-mentioned technological concepts with an emphasis on security and transmission speed, robustness and interworking of various wireless and wired technologies in SH. The work deals with testing information transmission using LED lights for VLC (Visible Light Communication) communication in Smart Home. The paper describes the possibilities of using a standardized communication medium KNX Twisted Pair technology for possible links with VLC for intercommunication between the individual technologies implemented in SH. Using the proposed broadcast system of VLC transmission, M-QAM modulation is tested here for various values of the carrier wave for the different distances in SH. Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava 17 Listopadu 15, Ostrava 70833 Czech Republic (jan.vanus@vsb.cz, petr.koudelka@vsb.cz, radek.martinek@vsb.cz, petr.bilik@vsb.cz, jan.zidek@vsb.cz) J. Vanus, T. Stratil, R. Martinek, P. Bilik, J. Zidek The Possibility of Using VLC Data Transfer in the Smart Home