• International Journal of Internet, Broadcasting and Communication
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• v.10 no.1
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• pp.71-76
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• 2018

The technology convergence of television, communication, and computing devices enables the rich social and entertaining experience through Smart TV in personal living space. The powerful smart TV computing platform allows to provide various user interaction interfaces like IR remote control, web based control, body gesture based control, etc. The presently used smart TV interaction user control methods are not efficient and user-friendly to access different type of media content and services and strongly required advanced way to control and access to the smart TV with easy user interface. This paper propose the optical wireless communication (OWC) based remote controller design for Smart TV using smart device Flashlights. In this approach, the user smart device act as a remote controller with touch based interactive smart device application and transfer the user control interface data to smart TV trough Flashlight using visible light communication method. The smart TV built-in camera follows the optical camera communication (OCC) principle to decode data and control smart TV user access functions according. This proposed method is not harmful as radio frequency (RF) radiation does it on human health and very simple to use as well user does need to any gesture moves to control the smart TV.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.4
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• pp.11-17
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• 2020

This paper proposed the design of a new window signage system architecture, which utilized a window of a building, with attached LED for visible light communication. In this paper, the proposed method using the LED strip to transmit light data and receive the data through a HMD with a smart device camera. The LED strip attached to the existing building window, as a part of semi-transparent signage. Semi-transparent signage based on a controllable LED strip-modules and attached to the window used to provide entertainment contents and the information service to people through optical camera communication (OCC) as well. Also, this work suggests using the camera supplied Head Mounted Device (HMD) as an OCC receiver. The LED attached window signage system structure described in this paper can be utilized in various buildings infrastructure like house, shopping areas, industrial building, etc.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.207-208
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• 2017

최근 보급되는 스마트 디바이스들은 실외뿐만 아니라 실내의 위치를 측정할 수 있는 기술들을 제공하고 있다. 실외 위치 측위 같은 경우는 기존의 GPS(Global Positioning System)를 사용하는 것이 일반적이지만, 실내 위치 측위는 기존의 GPS 방법으로는 한계가 있어 다양한 새로운 방법들이 연구 중에 있다. 그 중 가장 대표적인 방법은 BLE(Bluetooth Low Energy) 기반의 비콘(beacon)을 활용하는 것이다. 그러나 이 또한 추가적인 하드웨어가 필요할 뿐만 아니라 충전이 필요하다는 단점이 존재한다. 따라서 본 논문은 상기 단점들을 극할 수 있는 OCC(Optical Camera Communication)를 활용한 실내 위치 측위 기술을 고려한다. 특별히 공연장 내에서 관객들이 소지하고 있는 스마트 디바이스 카메라의 상대적인 위치정보를 획득하는 시스템을 제안한다. 이는 추가적인 하드웨어를 필요로 하지 않고 비동기식 접근이 가능하다는 장점이 있다. 본 논문에서 제안한 시스템을 통해 획득된 위치정보들은 촬영한 영상과 함께 저장되어 다양한 시점을 제공하는 응용데이터로 활용될 수 있을 것으로 기대한다.

• Journal of Convergence for Information Technology
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• v.10 no.2
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• pp.32-38
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• 2020

In this paper, we analyze the modulation scheme for high speed transmission in visible light communication system, and study non-orthogonal multiplexing, dimming level and transmission power ratio. Conventional visible light communication has a disadvantage in that it is difficult to multi-transmit to increase the transmission speed. Multi-transmission technique is necessary for high-speed transmission at the transmitter. Since general visible light communication has a limitation in multiple transmission, various researches for high-speed transmission have been conducted. In order to solve this problem, this paper proposes a multiple modulation scheme for high-speed visible light communication using non-orthogonal multiplex transmission scheme and a future research direction.

• Information and Communications Magazine
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• v.33 no.10
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• pp.10-16
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• 2016

IEEE 802.15.7 VLC(Visible Light Communication) 규격 이후에 카메라 기반 ISC(Image Sensor Communication) 관련 개정 필요성이 제기되어서 현재 IEEE 802.15.7m OWC(Optical Wireless Communication) TG가 표준화를 진행 중에 있다. 2016년 5월에 결정된 Baseline Document D0를 기반으로 LiFi(Light Fidelity), OCC(Optical Camera Communication) 및 LED-ID(LED Identification) 기술로 간단하게 분류하고 각 핵심 변조 기법을 소개한다. 5세대 이동통신과 함께 사용될 수 있는 다양한 IoT/ M2M 응용 서비스(LED, 디지털사이니지, 방송, 자동차 안전, 디스플레이 등)들이 포함되어 있다. 국내에서 혁신적인 비즈니스 모델 발굴과 국내 산/학/연/관이 협력하여 가시광, 적외선 및 자외선 분야에서 적극적인 연구개발이 있어야 할 것이다.

• Journal of Satellite, Information and Communications
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• v.11 no.1
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• pp.21-25
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• 2016

In this paper, we propose an algorithm for optimal selection of communications for smart lighting in heterogeneous networks. The smart lighting can be used for information communications and lighting simultaneously. To improve BER performance of smart lighting in heterogeneous networks, it adaptively selects a communication method among OCC, Wi-Fi, BLE based on distance between sensors and smart lightings, low power consumption for user requirements, operating time of smart lighting in Line-of-Sight(LOS)/Non-LOS channels. Thus, simulation results demonstrate effectiveness of the proposed algorithm contrary to baseline methods in LOS/NLOS channels.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.2
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• pp.1-7
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• 2020

The secure access the lighting, Heating, ventilation, and air conditioning (HVAC), fire safety, and security control boxes of building facilities is the primary objective of future smart buildings. This paper proposes an authorized user access to the electrical, lighting, fire safety, and security control boxes in the smart building, by using color grid coded optical camera communication (OCC) with face recognition Technologies. The existing CCTV subsystem can be used as the face recognition security subsystem for the proposed approach. At the same time a smart device attached camera can used as an OCC receiver of color grid code for user access authentication data sent by the control boxes to proceed authorization. This proposed approach allows increasing an authorization control reliability and highly secured authentication on accessing building facility infrastructure. The result of color grid code sequence received by the unauthorized person and his face identification allows getting good results in security and gaining effectiveness of accessing building facility infrastructure. The proposed concept uses the encoded user access authentication information through control box monitor and the smart device application which detect and decode the color grid coded informations combinations and then send user through the smart building network to building management system for authentication verification in combination with the facial features that gives a high protection level. The proposed concept is implemented on testbed model and experiment results verified for the secured user authentication in real-time.

• Journal of Satellite, Information and Communications
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• v.10 no.1
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• pp.62-66
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• 2015

This paper introduces various applications and contents of digital signage, and analyzes conventional communication techniques to increase communication range. To realize digital signage in long distance, this paper proposes a hybrid modulation scheme and analyzes its performance. To verify its performance in real channel environment, we mapped symbols and experimented data transmission and reception with a visible light communication module with USRP. As a result, we confirmed a data receiving range and power of transmission and reception of the hybrid modulation mode. Also, we showed that the proposed modulation scheme has better performance of communication range and power efficiency than that of the conventional QAM technique.

• Journal of Satellite, Information and Communications
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• v.9 no.3
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• pp.116-120
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• 2014

Visible Light Communication is one of the promising technologies for wireless communication due to the possibility to use existing LED lightening infrastructure to transmit data. LED has the ability to turn on and off very fast enough that our human eyes can't recognize so it can be used to transmit data via visible light along with illumination. But it faces flicker problem due to the brightness discrepancies between '1' and '0' bit patterns inside a data frame. Various run length limited (RLL) coding scheme like Manchester code, 4B6B, 8B10B or VPPM can be used to solve flickering problem. So we propose pseudo Manchester codding which can transmit data without modifying LED modulator and demodulator circuit as well as solve flickering problem.