Optical Wireless Communication (OWC)
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1 WHERE COMMUNICATION MEETS LED LIGHTING Optical Wireless Communication (OWC) Kickoff meeting, January 26, 2010 Zhengyuan Daniel Xu Director, UC-Light Center & Wireless Info. Technol. Lab Professor, Department of Electrical Engineering University of California, Riverside, CA Tel: , Acknowledgement 1 1
2 Outline 2 Introduction to WIT Research Group Introduction to OWC Ultraviolet (UV) Communication Motivation, applications Our focused topics Test-beds Visible Light Communication (VLC) Motivation, applications, research groups Our focused topics Test-beds News Report for WIT Research 2
3 Wireless Info. Technol. Group Director: Daniel Xu Postdoc: Gang Chen PhD: Michael He PhD: Ning Liu PhD: Haipeng Ding PhD: Kaiyun Cui PhD: Yiyang Li PhD: Leijie Wang PhD: Zongyu Dong Visiting PhD: Bo Bai Visiting Prof.: Dongweon Yoon 3 3
4 Research Areas Analytical, experimental and simulation study Localization Comm/Net Sensing TOA/DOA/ TDOA Cellular WLAN VLC/UV UWB environmental chemical biological multiuser detection channel estimation receiver design resource allocation packet scheduling optimal routing transceiver design advanced modulation digital processing channel modeling and capacity signaling & detection diversity techniques synchronization integrated OE adaptive modulation and coding (AMC) beam & power control multiple access routing & networking Hybrid opt/rf 4 4
5 Introduction to OWC Optical Spectrum 5 Optical vs. Radio Frequency Unlicensed, six orders of magnitude larger Short wavelength Little harm in visible, little EMI to RF equipment High gain antenna and high quality links Current Focused Areas in OWC Ultraviolet (UV) communication, visible light communication (VLC) 5
6 UV Commun. Motivation Unique Channel Characteristics Solar blind ( = nm) high SNR High scattering NLOS (relaxed PAT), penetration to fog High absorption secure, covert and anti-jamming (to RF) Recent Advances in Enabling Technologies UV LEDs, UV solid state laser High fidelity UV PMTs, UV APDs (DARPA s DUVAP program) UV solar blind bandpass filters Rugged cheap LEDs High sensitivity PMTs 6 Compact laser Solar blind filters Wide Spectrum APDs 6
7 UGS Chem/Bio Det Outdoor Comm Indoor Comm UV Commun. Applications 7 7
8 UV Commun. Technical Issues Communication Diagram Atmospheric scattering UV LEDs and rotation stages UV filter, PMT and rotation stages Signal generator Current driver High speed preamplifier Photon counter Trigger 8 Issues Channel characterization, communication techniques, performance tradeoffs, system protocols Other commun. environments Beyond (imaging, sensing, geolocation) 8
9 Receiver Transmitter UV Commun. & Path Loss Test-bed BER Tester LEDs Current Driver Modulator Oscilloscope Fn Generator PMT + Filter Pre- Amplifier Photon Counter Pre-Amplifier Demodulator 9 9
10 Pulse Broadening Test-bed White LEDs UV laser 3D mechanical module Detectors UV laser and lens Particle scattering UV lens, filter and PMT Signal generator High speed preamplifier Oscilloscope 10 Trigger 10
11 VLC Motivation New Generation Lighting LEDs 1-chip LED 11 J. K. Kim and E. F. Schubert, "Trancsending the replacement paradigm of solid-state lighting", Optics Express, vol. 16, no. 26, pp , 2008 Potential Benefits of Lighting LEDs 3-chip LED High energy efficiency, long sustainability, low production and maintenance cost, green Ubiquitous and low cost piggybacking commun. 11
12 VLC Applications 12 D. Shin, D. K. Jung, Y. J. Oh, T. Bae, H. C. Kwon, C. Cho, J. Son, "Visible light communication (VLC) motivation, application, and issue", IEEE TG7 document, doc.: IEEE <08/ > 12
13 VLC Worldwide Research Japan Korea Europe US First proposed by T. Komine and M. Nakagawa from Keio University in 2001 The Visible Light Communications Consortium (VLCC) established in Japan in Nov Company participation: Casio, Toshiba, Sony, NEC, SHARP, etc. Electronics and Telecommunications Research Institute (ETRI) Samsung Electronics UK: University of Oxford, Northumbria University Germany: Fraunhofer institute for telecommunications, Jacobs University Bremen, Simens Netherlands: Eindhoven University of Technology, Philips Home Gigabit Access (OMEGA) project Smart Lighting Center (Boston U, RPI, U of New Mexico) UC-Light Center led by UCR Intel, Interdigital, etc. 13 An IEEE task group (IEEE TG7) has been formed trying to set up a VLC standard (PHY and MAC layers in the network stack) 13
14 VLC Focused Issues Source modeling Encoder/Decoder Modulation/Demod. Pre/Post -processing Channel modeling Filtering/Detection Multiple access Network interfacing Compatibility with lighting Navigation 14 14
15 More Preliminary Test-bed 15 15
16 News Report 16 UV work Radios Broadcast into the Ultraviolet, Photonics Spectra, August ( cleid=39191) Ultraviolet Radios Beam to Life, IEEE Spectrum, May ( UV research by the WIT lab was regarded as a breakthrough at the Army Science and Technology Opportunities Conference, NC, UC-Light funding More than 20 media/websites reported including: KABC-TV, PhysOrg.com, SolidStateLightingDesign.com, Press Enterprise, TechNews, ACM, LightingChina.com, ChinaFibre-on-Line, Green Solutions Magazine 16
17 17 17
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II. EXPERIMENTAL SETUP
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