题目：???? Novel?Modulation?Techniques for?Visible?Light?Communication?Systems
报告人：Dr. Lin Luo
时? 间：2012年12月24日(周一)下午2:30
地? 点：基础教学楼A座303教室
?
讲座内容简介:
Visible?Light?Communication?(VLC)?is?a?free?space?optical?wireless?technology?using?the?visible?spectrum?to?convey?information,?which?is?the?optical?version?of?Wi-Fi.?Due?to?only?the?intensity?of?a?signal?is?used?to?carry?information,?optical?wireless?systems?are?constrained?to?send?real?and?positive?values?at?the?optical?transmitter.?Therefore,?the?conventional?modulation?techniques,?such?as?Orthogonal?Frequency?Division?Multiplexing?(OFDM),?cannot?be?directly?applied?in?optical?systems.?To?combat?multipath?distortion,?several?modified?OFDM?systems?have?been?studied,?such?as?DC-biased?optical?OFDM?(DCO-OFDM),?asymmetrically?clipped?optical?OFDM?(ACO-OFDM),?Flip-OFDM?and?Unipolar?OFDM?(U-OFDM),?etc.?In?order?to?transmit?real?signal?in?optical?environments,?there?is?a?Hermitian?symmetric?constraint?with?discrete?Fourier?transform?(DFT),?or?discrete?Hartley?transform?(DHT)?without?the?Hermitian?requirement.
In this talk, we propose two novel modulation techniques for VLC:
Position Modulating OFDM (PM-OFDM), which utilizes DFT but removes the Hermitian constraint. Two receiver structures will be presented with tradeoff between complexities and performance. The proposed PM-OFDM outperforms the existing systems in terms of bit-error-rate (BER) and complexity, with same spectral efficiency.
A low complexity Single Carrier with Frequency Domain Equalization (SC-FDE) system based on on-off-keying (OOK) modulation. Both analytical and numerical results show that the proposed system significantly outperforms existing SC-FDE and OFDM systems in terms of PAPR, BER and implementation complexity.
报告人简介：
Lin Luoreceived the B.E. in Electronic Engineering from University of Electronic Science and Technology of China (UESTC) in 2002, the M.E. in Telecommunications Engineering from the University of Melbourne in 2004, and the Ph.D. degree in Telecommunications Engineering from the Australian National University (ANU) in 2009. Currently he is a Research Fellow at the Institute for Telecommunications Research (ITR), University of South Australia (UniSA), Australia. Dr Luo serves as Vice Chair for the IEEE SA Section Joint Communications and Signal Processing Chapter (2012-2013). His current research interests include multi carrier and single carrier systems, green communications, MIMO, optical wireless communications and vehicle-to-vehicle communications.
