Abstract
A PE-ACO-OFDM (Position-Encoded Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing) signaling scheme for intensity modulation and direct detection is introduced in this paper, where the antiasymmetry characteristics of ACO-OFDM are exploited to improve the rate of data transmission. This is achieved by reducing the symbol duration of the ACO-OFDM signal, where only the first half of ACO-OFDM is used to transmit the ACO-OFDM data symbol after inverting its negative samples to positive ones. In addition, encoded ACO-OFDM samples are combined with every ACO-OFDM symbol to allow the receiver to identify the position of the inverted samples. Simulation results are introduced, and it is shown that the data rates of PE-ACO-OFDM improve by 33% compared with ACO-OFDM, when a 256-quadrature amplitude modulation scheme is considered as the encoded constellation order. It is also shown that the signal to noise ratio of the proposed PE-ACO-OFDM is higher by almost 1 dB compared with the traditional ACO-OFDM.
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This work is supported by the EPSRC research grant (No. EP/P006299/1).
Osama Saied received his higher diploma degree in electronic engineering from the High Institute for PolyTechnics, Gharyan, Libya in 2000, worked as networking engineering from 2001 to 2008 in Biruni Remote Sensing Center (BRSC) Tripoli, Libya. He received his M.Sc. degree in communication and signal processing in 2010, University of Newcastle upon Tyne, U.K.. He has been doing his Ph.D. in visible light communications at Northumbria University, Newcastle upon Tyne, U.K., since 2013. (Email: osama.saied@northumbri.ac.uk)
Zabih Ghassemlooy received his B.Sc. degree (Hons.) in electrical and electronics engineering from Manchester Metropolitan University, Manchester, U.K., in 1981, and the M.Sc. and Ph.D. degrees from the Institute of Science and Technology, Manchester, University of Manchester, U.K., in 1984 and 1987, respectively. From 1987 to 1988, he was a post-doctoral research fellow with City University, U.K.. In 1988 he joined Sheffeld Hallam University as a lecturer, becoming a reader in 1995 and became a professor in optical communications in 1997. In 2004 he joined the University of Northumbria (UNN), Newcastle, as an associate dean (AD) for research with the School of Computing, Engineering, and Information Sciences, and from 2012 to 2014, he was an AD of Research and Innovation, Faculty of Engineering, UNN, U.K., where he currently is the head of the Northumbria Communications Research Laboratories. In 2001 he was awarded the Tan Chin Tuan Fellowship in Engineering from the Nanyang Technological University in Singapore. In 2016 he became a research fellow at the Chinese Academy of Sciences, and since 2015 he has been a distinguished professor with the Chinese Academy of Sciences, Quanzhou, China. He is a visiting professor at the University Tun Hussein Onn Malaysia, Malaysia (2013-2017), and Huaqiao University, Quanzhou, China (2017-2018). He published over 690 papers (258 journals and 6 books), over 88 keynote and invited talks, and supervised 57 Ph.D. students. His research interests include optical wireless communications, free space optics, and visible light communications. He was the vice-chair of EU Cost Action IC1101 (2011-2016). He is the chief editor of the British journal of applied science and technology and the International journal of optics and applications. He is a fellow of the IET, a senior member of IEEE, and a member of OSA. He is a coauthor of a CRC book on Optical Wireless Communications|Systems and Channel Modelling with Matlab (2012)"; and coeditor of four books including the Springer book on Optical Wireless Communications|An Emerging Technology (2016)", CRC book on Visible Light Communications: Theory and Applications, CRC June 2017", IGI Global book on Intelligent Systems for Optical Networks Design: Advancing Techniques, 31 Mar 2013", and IET book on Analogue Optical Fibre Communications, IEE Telecommunication series 32, 1995". From 2004-2006 he was the IEEE UK/IR Communications chapter secretary, the vice-chairman (2004-2008), the chairman (20082011), and chairman of the IET Northumbria Network (Oct. 2011-2015). (Email: z.ghassemlooy@northumbria.ac.uk)
Xuan Tang is an academic leader and professor at the Fujian Institute of Research on the structure of matter, Chinese Academy of Sciences (CAS). She is a team member of Youth Innovation Promotion Association CAS. Her research interests are in the areas of optical wireless communication systems including high speed infrared/ultraviolet laser communications, visible light communications and optical MIMO systems, as well as radio frequency communication technologies. In June 2008 she was awarded BEng (1st Class with Hons.) in electronic and communications engineering from Northumbria University, Newcastle, U.K.. In 2013 she obtained her Ph.D. degree on polarisation shift keying modulated free-space optical communication systems, and it was in collaboration with Chosun University, South Korea. From Oct. 2012 to Jul. 2014, she worked as the postdoctoral researcher at the Department of Electronic Communications Engineering, Tsinghua University. From Oct. 2013 to Apr. 2014, she was a visiting academic at University of Science and Technology of China. Her group has obtained 13 funds, including General Financial Grant from China Postdoctoral Science Foundation, National Science Fund for Young Scholars, External Cooperation Program of Chinese Academy of Sciences, Youth Innovation Promotion Association CAS, Returned Overseas Chinese Scholars of the State Education Ministry and so on, the grant of which is as much as tenmillion yuan. She has published over 50 papers, of which almost 30 are SCI papers. She acts as a reviewer for a number of high impact journals including IEEE journal of lightwave technology, IEEE journal on selected areas in communications, IET communications, applied optics, etc. (Email: xtang@fjirsm.ac.cn)
Xuewu Dai received his B.Eng. degree in communication engineering and M.Sc. degree in computer science from Southwest University, China, respectively, and a Ph.D. degree in electrical and electronic engineering from the University of Manchester, U.K., 2008. Prior to his appointment at Northumbria University, he did post-doctoral research at University of Oxford (2011-2013) and University College London (2009-2011), respectively. His research covers both academic and industrial interests, centered around the robust state estimation and its applications to condition monitoring, OFDM channel estimation, wireless sensor actuator networks. He has published over 40 research articles in peerreviewed journals and world-leading conferences, and served as regular reviewers for some top journals and as TPC members for several IEEE conferences (such as ICC'2015/2016, etc). (Email: xuewu.dai@northumbria.ac.uk)
Hoa Le Minh received his B.Eng. degree in telecommunications in 1999 at Bach Khoa University of Hochiminh city, Vietnam, and then worked as lecturer in Telecommunications Department at the same University. He received M.Sc. degree in 2003 and in 2007 his Ph.D. degree in telecommunications in Munich University of Technology (TUM), Germany and Northumbria University, Newcastle, U.K., respectively. Hoa worked as a research assistant in Siemens AG, Munich, Germany during 2002-2004 and postdoctoral research fellow in University of Oxford, U.K., from 2007 to 2010. Since 2010 he has been the senior lecturer at Northumbria University. His research areas are wireless communications, optical wireless communications, sensor network and smartphone technology. He has published over 150 papers in these fields. Currently he is chairman of IEEE ComSoc U.K. and Ireland. (Email: hoa.leminh@northumbria.ac.uk)
Bangjiang Lin received his B.S. and Ph.D. degrees from Electronics Engineering Department of Peking University, Beijing, China, in 2010 and 2015, respectively. He is currently working as an associate professor in Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences. His research interests include passive optical network, visible light communications. (Email: linbangjiang@163.com)
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Saied, O., Ghassemlooy, Z., Tang, X. et al. Position encoded asymmetrically clipped optical orthogonal frequency division multiplexing in visible light communications. J. Commun. Inf. Netw. 2, 1–10 (2017). https://doi.org/10.1007/s41650-017-0038-2
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DOI: https://doi.org/10.1007/s41650-017-0038-2