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Carrier-less amplitude and phase modulated visible light communication system based on a constellation-shaping scheme

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Chinese Optics Letters 2017年第3期15卷 69-73页

作者：王智鑫张梦洁陈思源迟楠 State Key Lab of ASIC Department of Communication Science and EngineeringFudan UniversityShanghai 200433China

In this Letter, we propose a novel constellation-shaping carrier-less amplitude and phase （CAP） modulation scheme to alleviate the systematic nonlinearity in visible light communication （VLC） systems. A simple geo- metric transformation shaping method is employed to convert the normal square lattice constellation into multi- ple circular constellations. The feasibility and performance are investigated and experimentally demonstrated by a 1.25 Gb/s CAP-modulated VLC system. The results indicate that the circular constellation has better resis- tance to systematic nonlinearity compared with a rectangular constellation. The dynamic range of input signal peak-to-peak values promotes 20% at a low bias voltage nonlinear area and 50% at a high bias voltage nonlinear area. To the best of our knowledge, this is the first time constellation-shaping CAP has ever been reported in indoor high data rate VLC systems.

关键词： Bias voltage Light Mathematical transformations Phase modulation

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Sub-10 nm silicon FinFET devices on SOI substrate made by block copolymer lithography

Sub-10 nm silicon FinFET devices on SOI substrate made by bl...

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International Conference on Solid-state and Integrated Circuit Technology

作者： Dong-Xue Li Chien-Liang Chien Xinnian Wei Yanwei Huang Xin-Ping Qu Tzu-Hsuan Chang Shisheng Xiong School of Microelectronics State Key Lab of ASIC and System Fudan University Shanghai China Department of Electrical Engineering National Taiwan University Taipei School of Information Science and Technology Fudan University Shanghai China

Block copolymer (BCP) lithography as a low-cost and simple process emerges to become an important patterning technique in microelectronic manufacturing. In this work, self-assembly of a triblock copolymer was used to prepare silicon nanowire FinFET devices on the SOI substrate. The original pattern was formed on the block copolymer layer via self-assembly, and then transferred to the Si layer by dry etching that stops at the interface of Si and box oxide. The minimum critical dimension of the device can be as small as 8 nm, and the performance is extensively evaluated. This type of FinFET device shows high transconductance (g m ) 150 μS, signifies extremely low off current (I OFF ) ~50 pA, and high on/off current ratio (I ON /I OFF ) up to 3×10 6 .

关键词： Silicon FinFETs Self-assembly Substrates Silicon-on-insulator Lithography Nanoscale devices

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NTIRE 2020 Challenge on Image and Video Deblurring

arXiv

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arXiv 2020年

作者： Seungjun, Nah Sanghyun, Son Radu, Timofte Kyoung Mu, Lee Tseng, Yu Xu, Yu-Syuan Chiang, Cheng-Ming Tsai, Yi-Min Brehm, Stephan Scherer, Sebastian Xu, Dejia Chu, Yihao Sun, Qingyan Jiang, Jiaqin Duan, Lunhao Yao, Jian Purohit, Kuldeep Suin, Maitreya Rajagopalan, A.N. Ito, Yuichi Hrishikesh, P.S. Puthussery, Densen Akhil, K.A. Jiji, C.V. Kim, Guisik Deepa, P.L. Xiong, Zhiwei Huang, Jie Liu, Dong Kim, Sangmin Nam, Hyungjoon Kim, Jisu Jeong, Jechang Huang, Shihua Fan, Yuchen Yu, Jiahui Yu, Haichao Huang, Thomas S. Zhou, Ya Li, Xin Liu, Sen Chen, Zhibo Dutta, Saikat Das, Sourya Dipta Garg, Shivam Sprague, Daniel Patel, Bhrij Huck, Thomas Department of ECE ASRI SNU Korea Republic of Computer Vision Lab ETH Zurich Switzerland MediaTek Inc University of Augsburg Chair for Multimedia Computing and Computer Vision Lab Germany Peking University China Beijing University of Posts and Telecommunications China Beijing Jiaotong University China Wuhan University China Indian Institute of Technology Madras India Vermilion College of Engineering Trivandrum India CVML Chung-Ang University Korea Republic of APJ Abdul Kalam Technological University India University of Science and Technology of China China Image Communication Signal Processing Laboratory Hanyang University Korea Republic of Southern University of Science and Technology China University of Illinois at Urbana-Champaign United States CAS Key Laboratory of Technology in Geo-Spatial Information Processing and Application System University of Science and Technology of China China IIT Madra Jadavpur University India University of Texas Austin United States Duke University Computer Science Department United States

Motion blur is one of the most common degradation artifacts in dynamic scene photography. This paper reviews the NTIRE 2020 Challenge on Image and Video Deblurring. In this challenge, we present the evaluation results from 3 competition tracks as well as the proposed solutions. Track 1 aims to develop single-image deblurring methods focusing on restoration quality. On Track 2, the image deblurring methods are executed on a mobile platform to find the balance of the running speed and the restoration accuracy. Track 3 targets developing video deblurring methods that exploit the temporal relation between input frames. In each competition, there were 163, 135, and 102 registered participants and in the final testing phase, 9, 4, and 7 teams competed. The winning methods demonstrate the state-of-the-art performance on image and video deblurring tasks. Copyright © 2020, The Authors. All rights reserved.

关键词： Image enhancement

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Room-temperature continuous-wave operation of organometal halide perovskite lasers

arXiv

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arXiv 2018年

作者： Li, Zhitong Moon, Jiyoung Gharajeh, Abouzar Haroldson, Ross Hawkins, Roberta Hu, Walter Zakhidov, Anvar Gu, Qing Department of Electrical and Computer Engineering Department of Material Science and Engineering Department of Physics University of Texas at Dallas RichardsonTX75080 United States ASIC and System State-key Lab Institute of Microelectronics Fudan University Shanghai200433 China Department of Nanophotonics and Metamaterials ITMO University St. Petersburg Moscow Russia

Solution-processed organic-inorganic lead halide perovskites have recently emerged as promising gain media for tunable semiconductor lasers. However, optically pumped continuous-wave lasing at room temperature - a prerequisite for a laser diode - has not been realized so far. Here, we report lasing action in a surface emitting distributed feedback methylammonium lead iodide (MAPbI3) perovskite laser on silicon substrate, at room temperature under continuous-wave optical pumping. This outstanding performance is achieved because of the ultra-low lasing threshold of 13 W/cm2, which is enabled by thermal nanoimprint lithography that directly patterns perovskite into a high Q cavity with large mode confinement, while at the same time improves perovskite's emission characteristics. Our results represent a major step toward electrically pumped lasing in organic and thin-film materials, as well as the insertion of perovskite lasers into photonic integrated circuits for applications in optical computing, sensing and on-chip quantum information. Copyright © 2018, The Authors. All rights reserved.

关键词： Perovskite

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A highly efficient reconfigurable rotation unit based on an inverse butterfly network

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Frontiers of Information Technology & Electronic engineering 2017年第11期18卷 1784-1794页

作者： Chao MA Zi-bin DAI Wei LI Hai-juan ZANG Department of Electrical Engineering Zhengzhou Institute of Information Science and Technology Zhengzhou 450004 China State Key Lab of ASIC and System Fudan University Shanghai 200240 China School of Computer Engineering Jiangsu University of Technology Changzhou 213001 China

We propose a reeonfigurable control-bit generation algorithm for rotation and sub-word rotation operations. The algorithm uses a self-routing characteristic to configure an inverse butterfly network. In addition to being highly parallelized and inexpensive, the algorithm integrates the rotation-shift, bi-directional rotation-shift, and sub-word rotation-shift operations. To our best knowledge, this is the first scheme to accommodate a variety of rotation operations into the same architecture. We have developed the highly efficient reconfigurable rotation unit （HERRU） and synthesized it into the Semiconductor Manufacturing International Corporation （SMIC）＇s 65-nm process. The results show that the overall efficiency （relative areaxrelative latency） of our HERRU is higher by at least 23% than that of other designs with similar functions. When executing the bi-directional rotation operations alone, HERRU occupies a significantly smaller area with a lower latency than previously proposed designs.

关键词： Rotation operations Self-routing Control-bit generation algorithm Inverse butterfly network

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A Low-complexity FFT Processor using Two-Dimensional Algebraic Integer Encoding 13

A Low-complexity FFT Processor using Two-Dimensional Algebra...

引用

2016 13th IEEE International Conference on Solid-state and Integrated Circuit Technology (ICSICT)

作者： Sangho Yun Fan Wu Gerald E.Sobelman Xiaofang Zhou Department of Electrical and Computer Engineering University of Minnesota State Key Lab of ASIC and System Fudan University

ISBN: (纸本)9781467397209

An efficient architecture of a 64-point FFT processor using two-dimensional algebraic integer(AI) encoding is presented. The advantage of two-dimensional AI encoding is that the hardware complexity for multiplication is reduced since a multiplication can be replaced by a few simple shifts and additions. The ROMless FFT processor, which replaces the ROM for twiddle factors with a twiddle factor generator(TFG)using 2-D AI encoding, has less hardware complexity than previous implementations. The proposed architecture uses a wordlength of 14 bits to achieve an acceptable SNR. It has been synthesized onto an FPGA, and comparative resource utilization results are presented.

关键词： FFT/IFFT AIQ WLAN OFDM

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X-Band Power Amplifier for Next Generation Networks Based on MESFET

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China communications 2017年第4期14卷 11-19页

作者： Muhammad Saad Khan Hongxin Zhang Fan Zhang Sulman Shahzad Rahat Ullah Sajid Ali Qasim Ali Arain Manzoor Ahmed School of Electronic Engineering Beijing University of Posts and Telecommunications (BUPT) Beijing 100876 China Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunications Beijing 100876 china College of Information Science and Electrical Engineering Zhejiang University Hangzhou Zhejiang 310027china Electrical Engineering Department University College of Engineering & Technology Bahauddin Zakariya University Multan Pakistan State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China Department of Coxnputer Science D.G. Khan Campus. University of Education Lahore Pakistan Future lnternet & Communication Lab (FIB) Department of Electronic Engineering Tsinghua University Beijing 100084 China

Advanced wireless standards of communication like 3GPP and LTE are becoming more and more efficient and with this evolution of communication systems mobile equipment is also become smaller and smaller. Power amplifier designing has become a very crucial task in this era where efficiency and size are the main concern of any designer. In this paper we have design and analyzed X-band Class E Metal-semiconductor field effect transistor(MESFET) based Power Amplifier. This device targets the devices which use OFDM technique to improve their spectral efficiency for the next generation communication systems. Microstrip lines are used to achieve small size for our design instead of lumped components. Load Pull measurements are used to get MESFET input and output impedances optimum values. For linear and non linear operation small signal mathematical model of the design is used. To reduce thermal losses FR4 substrate is used to increase PA efficiency. Our designs shows small values of input and output return loss of about-22.3d B and-23.716 d B achieving a high gain of about25.6 d B respectively, with PAE of about 30 % having stability factor greater than 1 and 21.894 d Bm of output power.

关键词： MESFET X-band power amplifier advance design system PAE LTE

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5G ENTERING INTO A NEW ERA

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China communications 2017年第12期14卷 I0002-I0004页

作者： Feifei Gao Changle Li Jun Fang Kaizhi Huang Zhi Quan Chengwen Xing Jianhua Zhang Zhongshan Zhang Liqiang Zhao Yulong Zou Department of Automation Tsinqhua UniversityBeiiingChina the State Key Laboratory of Integrated Services Networks Xidian University china communications ieee communications magazine ieee signal processing letters national digital switching system engineering&technological research center the college of information engineering shenzhen university the school of information and electronics beijing institute of technology bupt itu-r imt-2020 channel model ieee comm the school of computer and communication engineering in the university of science and technology beijing(ustb) state key lab.of integrated ser vice networks xidian university the nanjing university of posts and telecommunications(nupt)

The ever increasing wireless data services, such asimaging, video, audio, multimedia, etc., have de-mands for the very high speed wireless communicationsand network, which are unfortunately a bottleneck whencombining with the wireline core network. Users＇ arenow expecting high quality of experience with low-costdevices, ubiquitous connectivity, energy efficiency, highreliability, or even ultra-low latency if a vehicle terminalis applied.

关键词： 5G ENTERING A NEW ERA

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Ultra-low charge transfer resistance carbons by onepot hydrothermal method for glucose sensing

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science China Materials 2017年第12期60卷 1234-1244页

作者：胡博韬刘仁材陈靖容赵湛张淑真康沛伦 College of Materials Science and Opti-Electronic Technology University of Chinese Academy of Sciences Beijing 101408 School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing 101408 State Key Lab of Transducer Technology Institute of Electronics Chinese Academy of Sciences Beijing 100089 Department of Electric Engineering I-Shou University Kaohsiung 82445 Cardiovascular Surgery Department of Surgery Kaohsiung Veterans General Hospital Kaohsiung 82445

Hydrothermal carbon （HTC） is typically well- dispersed, but it remains a great challenge for HTC to become conductive. Co-doping with heteroatoms has been confirmed to be an effective strategy to significantly promote the electrical conductivity of carbon. Moreover, there is no simple and green method to construct sensitive HTC based electro- chemical biosensors until now. In this paper, N and S dual-doped carbon （NS-C） with ultra-low charge transfer resistance is easily synthesized from L-cysteine and glucose in a hydrothermal reaction system. The morphology, structural prop- erties and electrochemical properties of the as-prepared NS-C are analyzed. In comparison with the undoped hydrothermal （UC） modified glassy carbon electrode （GCE）, the charge transfer resistance of UC （476 Ω） is ten times the value of NS- C （46 Ω）. The developed biosensor shows a better performance to detect glucose in a wide concentration range （50-2500 μmol L^-1） with the detection limit of 1.77 μmol L^-1 （S/N-3） and a high sensitivity （0.0554 μA cm^-2μmol^-1 L）. The apparent Michaelis-Menten constant value of GCE/NS-C/GOx/nafion modified electrode is 0.769 mmol L^-1, indicating a high affinity of glucose oxidase to glucose. These results demonstrate that the hydrothermal method is an effective way for prepar- ing high electrical conductivity carbon with excellent performances in biosensor application.

关键词： hydrothermal method glucose biosensor charge transfer resistance heteroatom doped carbon electrochemical behavior

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Biogeography-based optimization for cluster analysis

Biogeography-based optimization for cluster analysis

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International Conference on Computer, communication and Computational sciences, ICCCCS 2016

作者： Wu, Xueyan Wang, Hainan Chen, Zhimin Lu, Zhihai Phillips, Preetha Wang, Shuihua Zhang, Yudong School of Computer Science and Technology Nanjing Normal University NanjingJiangsu210023 China Key Laboratory of Statistical Information Technology & Data Mining State Statistics Bureau ChengduSichuan610225 China School of Computer and Information Engineering Henan Normal University XinxiangHenan453000 China School of Electronic Information Shanghai Dianji University Shanghai200240 China Key Laboratory of Symbolic Computation & Knowledge Engineering of Ministry of Education Jilin University ChangchunJilin130012 China Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology GuilinGuangxi541004 China School of Natural Sciences and Mathematics Shepherd University ShepherdstownWV25443 United States West Virginia School of Osteopathic Medicine 400 N Lee St LewisburgWV24901 United States Department of Electrical Engineering The City College of New York CUNY New YorkNY10031 United States State Key Lab of CAD & CG Zhejiang University HangzhouZhejiang310027 China Manchester Metropolitan University ManchesterM156BH United Kingdom

ISBN: (纸本)9789811037696

With the aim of resolving the issue of cluster analysis more precisely and validly, a new approach was proposed based on biogeography-based optimization (abbreviated as BBO) algorithm. (Method) First, we reformulated the problem with an optimization model based on the variance ratio criterion (VARAC). Then, BBO was presented to search the optimal solution of the VARAC. There are 400 data of four groups in the experimental dataset, which have the degrees of overlapping of three distinct scales. The first one is nonoverlapping, the second one is partial overlapping, and the last is severely overlapping. BBO algorithm was compared with three different state-of-the-art approaches. We ran every algorithm 20 times. In this experiment, our results demonstrate the maximum VARAC values that can be found by BBO. The conclusion is that BBO is predominant which is extremely quick for the issue of clustering analysis. © Springer Nature Singapore Pte Ltd. 2017.

关键词： Cluster analysis

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