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The future of indoor lighting is currently moving in the direction of being multifunctional; modern light sources have the capacity for illumination and concurrent wireless data transmission. The merger of these two applications has been made possible through solid-state high brightness light emitting diode (LED) technology. LEDs have consistently increased the light generated per package by a factor of 20 (for a given wavelength), whereas the cost per lumen has fallen by a factor of 10, every ten years in accordance with Haitz’s law. Short-range optical wireless communication utilizing the visible spectrum emitted from the LEDs, referred to as visible light communication (VLC) transmits data via modulation of the light intensity. So far the VLC capability is above 1 Gbit/s with a reasonable coverage range that is applicable for home/office environment. VLC also offers a complementary scheme to radio-frequency (RF) communications; using a license free spectrum and inherently secure connections (as light cannot propagate through the surrounding walls) as well as offering immunity to all RF interference. The dual functionality required from the LED creates the unique opportunity for indoor localization which is much more precise than RF counterpart. In addition the user “visually” knows whether they will receive location data, unlike RF signal (NFC, WIFI or RFID) might be shielded or faded.
On the other hand, smart handheld devices (e.g. tablet) usage has grown substantially in the last several years for personal and business applications. The devices are anticipated to be effortlessly used for multiple purposes and in a wide range of applications including communications, entertainment, productivity, monitoring and navigation where the last one, navigation application, is expecting to grow rapidly the next few years as human beings entering the smart society era. Therefore smart devices together with localization sensors are becoming highly integrated to form a newly supporting living-system and they will be mutually developed, well connected and affordable to every user.
This project aims to develop a prototype of a smart cart, an intelligent version of those usually found in supermarkets, a smart lighting system that support VLC-based indoor localization and data transmission, and a cloud-based infrastructure to provide a personalized customer shopping experience, as illustrated in the left figure. In particular, customers visiting a smart supermarket, like the one proposed here, could enjoy the following functions and benefits:
This project is joint research between Computer Communications Lab. (CCL) and Computer Arts lab. (CAL), the University of Aizu.
The project implementation includes six (06) work packages (WP), as summarized in the above figure. The WP breakdown corresponds to technology and system level partitioning, and it is as the following.
Technologies (under construction)
Visible Light Communications
Indoor Positioning System
VLC Communications Networks
HTTP/2 Streaming to Mobile Terminals
Mobile App Developments
Publications and Reports
 Hung T. LE,
Thang VU, Nam PHAM NGOC, Anh T. PHAM, and Truong Cong THANG.
Seamless Mobile Video Streaming over HTTP/2 with Gradual Quality
Transitions. IEICE Tran. on Communications, Vol.E100-B,
No.5, pp.901-909, May 2017.
 Thanh V. Pham
and Anh T. Pham. On the Secrecy Sum-Rate of MU-VLC Broadcast Systems
with Confidential Messages. In the Proc. of the 10th
International Symposium on Communication Systems, Networks and
Digital Signal Processing (CSNDSP) - 5th Colloquium on Optical
Wireless Communications. Prague, Czech Republic, July 2016.
 Duc V. Nguyen, Hung T. Le, Pham Ngoc Nam, Anh T. Pham, and Truong Cong Thang. Adaptation Method for Video Streaming over HTTP/2. IEICE Communications Express. Vol. 5, No. 3, pp.69-73, Mar. 2016
 J. Villegas. Locating virtual sound sources at arbitrary distances in real-time binaural reproduction. Virtual Reality, 19(3):201–212, Oct 2015
 Hung T. Le, Hai N. Nguyen, Nam Pham Ngoc, Anh T. Pham, Hoa Le Minh, and Truong Cong Thang. Quality-driven bitrate adaptation method for HTTP live-streaming. In the Proc. of the IEEE ICC'15, QoE-FI WS, London, UK, June 2015.
 Thanh V. Pham, Hoa Le Minh, Zabih Ghassemlooy, Takafumi Hayashi, and Anh T. Pham. Sum-Rate Maximization of Multi-User MIMO Visible Light Communications. In the Proc. of the IEEE ICC'15, VLCN WS, London, UK, June 2015.
 Hoa Le Minh, Zabih Ghassemlooy, Andrew Burton, Farag Mousa, Suparna Biswas, Anh T. Pham, Tien Dat Pham and Shien-Kuei Liaw. Self-Correcting MIMO Visible Light Communications System Using Localisation. In the Proc. of the IEEE ICC'15, VLCN WS, London, UK, June 2015.
 Thanh V. Pham and Anh T. Pham. Max-Min Fairness and Sum-Rate Maximization of MU-VLC Local Networks. In Proc. of the IEEE GLOBECOM 2015 WS-OWC, San Diego, USA, Dec. 2015.
 Duc V. Nguyen, Hung T. Le, Pham Ngoc Nam, Anh T. Pham and Truong Cong Thang. Request Adaptation for Adaptive Streaming Over HTTP/2. In Proc. of the IEEE ICCE 2016, Las Vegas, USA, Jan 2016.
 Hung T. Le, Pham Ngoc Nam, Anh T. Pham and Truong Cong Thang. Quality-Energy Aware Adaptation for Mobile Streaming Clients. In Proc. of the IEEE ICCE 2016, Las Vegas, USA, Jan 2016.
 R. Igarashi
and J. Villegas. ステガノグラフィ技術に基づく音声符号化と復号化の研究 (Steganography using
audible signals for short distance communication). In Proc. Acoust.
Soc. Japan, Autumn meeting, Aizu Wakamatsu, Japan, Sep. 2015. In
Project title: "Study and development of smart supermarket by using visible light communication (VLC) and smartphone technologies". This project is supported by JSPS KAKENHI Grant Number 15K00134 from 2015-2017.
(C) 2015-2017 Computer Communications Lab. and Computer Arts Lab.