VLSI Architecture for Differential Manchester Encoding for DSRC Applications 1 2 3 CH
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Criteria for Choosing Line Codes in Data Communication
ISTANBUL UNIVERSITY – YEAR : 2003 (843-857) JOURNAL OF ELECTRICAL & ELECTRONICS ENGINEERING VOLUME : 3 NUMBER : 2 CRITERIA FOR CHOOSING LINE CODES IN DATA COMMUNICATION Demir Öner Istanbul University, Engineering Faculty, Electrical and Electronics Engineering Department Avcılar, 34850, İstanbul, Turkey E-mail: [email protected] ABSTRACT In this paper, line codes used in data communication are investigated. The need for the line codes is emphasized, classification of line codes is presented, coding techniques of widely used line codes are explained with their advantages and disadvantages and criteria for chosing a line code are given. Keywords: Line codes, correlative coding, criteria for chosing line codes.. coding is either performed just before the 1. INTRODUCTION modulation or it is combined with the modulation process. The place of line coding in High-voltage-high-power pulse current The transmission systems is shown in Figure 1. purpose of applying line coding to digital signals before transmission is to reduce the undesirable The line coder at the transmitter and the effects of transmission medium such as noise, corresponding decoder at the receiver must attenuation, distortion and interference and to operate at the transmitted symbol rate. For this ensure reliable transmission by putting the signal reason, epecially for high-speed systems, a into a form that is suitable for the properties of reasonably simple design is usually essential. the transmission medium. For example, a sampled and quantized signal is not in a suitable form for transmission. Such a signal can be put 2. ISSUES TO BE CONSIDERED IN into a more suitable form by coding the LINE CODING quantized samples. -
Vpisystems—Demonstration Examples
Appendix VPIsystems—Demonstration Examples Introduction The following 12 examples have been added to demonstrate important engineering aspects of Chapter 3. The user can play with each example in real time by accessing the website http://www.vpiphotonics.com/VPIplayer.php. This particular website is maintained by VPIsystems GmbH and it is provided at no cost to the user. Any difficulties opening the website or any software improperly functioning should be addressed directly to VPIsystems GmbH, Carnotstr. 6, 10587 Berlin, Germany, Phone +49 30 398 058-0, Fax +49 30 398 058-58 Application Example 1 Title System impairments in 10 Gbps NRZ-based WDM transmissions Description This setup illustrates the impact of ASE noise and fiber nonlinearities on the performance of a 10 Gbps NRZ-based WDM system. The BER of each channel can be investigated individually. The user can adjust the number of spans (transmission length), switch off/on the fiber nonlinear- ities and modify the EDFA noise figure. Application Example 2 Title Performance of NRZ, RZ, and Duobinary modulation format in 10 Gbps transmission Description The setup compares the performance of the NRZ, RZ, and Duobinary modulation formats in a single channel 10 Gbps transmission. The BER obtained with each modulation format are displayed against the accumulated dispersion or the OSNR. The user can adjust the OSNR (respectively the accumulated dispersion) as well as the 3 dB bandwidth of the optical filter in front of the receiver. S. V. Kartalopoulos, Next Generation Intelligent Optical Networks, 257 C Springer 2008 258 Appendix: VPIsystems—Demonstration Examples Application Example 3 Title Performance comparison of NRZ, DPSK, and DQPSK in 40 Gbps transmission Description The setup investigates the performance of NRZ, DPSK, and DQPSK modulation in a single channel 40 Gbps transmission. -
One Twisted Pair Cable Or Equivalent) Capable of Transporting Analog Signals in the Frequency Range Ofapproximately 300 to 3000 Hertz (Voiceband)
APPENDIX UNE-SBCI3STATE PAGE 21 OF 51 SBC-13STATE/SPRINT COMMUNICATIONS COMPANY, L.P. 110802 8 .3 SBC-12STATE will offer the following subloop types: 8.3.1 2-Wire Analog Subloop provides a 2-wire (one twisted pair cable or equivalent) capable of transporting analog signals in the frequency range ofapproximately 300 to 3000 hertz (voiceband). 8.3.2 4-Wire Analog Subloop provides a 4-wire (two twisted pair cables or equivalent, with separate transmit and receive paths) capable of transporting analog signals in the frequency range of approximately 300 to 3000 hertz (voiceband). 8.3.3 4-Wire DS 1 Subloop provides a transmission path capable of supporting a 1 .544 Mbps service that utilizes AMI or B8ZS line code modulation. 8.3.4 DS3 Subloop provides DS3 service from the central office MDF to an Interconnection Panel at the RT. The loop facility used to transport the DS3 signal will be a fiber optical facility. 8 .3 .5 2-Wire / 4-Wire Analog DSL Capable Subloop that supports an analog signal based DSL technology (such as ADSL). It will have twisted copper cable that may be loaded, have more than 2,500 feet of bridged tap, and may contain repeaters. 8 .3.6 2-Wire / 4-Wire Digital DSL Capable Subloop that supports a digital signal based DSL technology (such as HDSL or IDSL). It will have twisted copper cable that may be loaded, have more than 2,500 feet of bridged tap, and may contain repeaters. 8.3 .7 ISDN Subloop is a 2-Wire digital offering which provides a transmission path capable of supporting a 160 Kbps, Basic Rate ISDN (BRI) service that utilizes 2BIQ line code modulation with end user capacity up to 144 Kbps . -
CLASS 341 CODED DATA GENERATION OR CONVERSION January 2011
CLASS 341 CODED DATA GENERATION OR CONVERSION 341 - 1 341 CODED DATA GENERATION OR CONVERSION 1 DIGITAL PATTERN READING TYPE 50 DIGITAL CODE TO DIGITAL CODE CONVERTER CONVERTERS 2 .Plural denominationally related 51 .Adaptive coding carriers (e.g., coarse/fine 52 .To or from particular bit symbol geared discs) 53 ..Bit represented by pulse width 3 .Plural types of codes on single 54 ..Bit represented by discrete carrier frequency 4 .According to nonlinear function 55 .Substituting specified bit 5 .For X or Y coordinate combinations for other determination (e.g., stylus- prescribed bit combinations pad) 56 .To or from multi-level codes 6 .With directional discrimination 57 ..Binary to or from ternary 7 .Antiambiguity feature 58 .To or from minimum d.c. level 8 .Real and complementary patterns codes 9 .Having combined (e.g., 59 .To or from run length limited denominational, combination codes code) coding pattern 60 .To or from packed format 10 ..Constant distance code 61 .Data rate conversion 11 .Incremental 62 .BCD (binary-coded-decimal) to or 12 .Cathode ray from decimal 13 .Optical 63 .To or from bit count codes 14 ..Having optical waveguide 64 .To or from number of pulses 15 .Magnetic, inductive or 65 ..To or from Huffman codes capacitive 66 ..To or from Morse code 16 .Brush and contacts or conductive 67 .To or from variable length codes pattern 68 .To or from NRZ (nonreturn-to- 17 .Actuated by physical projection zero) codes 20 BODILY ACTUATED CODE GENERATOR 69 ..Return-to-zero to or from NRZ 21 .For handicapped user (nonreturn-to-zero) -
An Efficient Utilization of Power Spectrum Density for Smart Cities
sensors Article Moving towards IoT Based Digital Communication: An Efficient Utilization of Power Spectrum Density for Smart Cities Tariq Ali 1,*, Abdullah S. Alwadie 1, Abdul Rasheed Rizwan 2, Ahthasham Sajid 3 , Muhammad Irfan 1 and Muhammad Awais 4 1 Electrical Engineering Department, College of Engineering, Najran University, Najran 61441, Saudi Arabia; [email protected] (A.S.A.); [email protected] (M.I.) 2 Department of Computer Science, Punjab Education System, Depaalpur 56180, Pakistan; [email protected] 3 Department of Computer Science, Faculty of ICT, Balochistan University of Information Technology Engineering and Management Sciences, Quetta 87300, Pakistan; [email protected] 4 School of Computing and Communications, Lancaster University, Bailrigg, Lancaster LA1 4YW, UK; [email protected] * Correspondence: [email protected] Received: 8 April 2020; Accepted: 14 May 2020; Published: 18 May 2020 Abstract: The future of the Internet of Things (IoT) is interlinked with digital communication in smart cities. The digital signal power spectrum of smart IoT devices is greatly needed to provide communication support. The line codes play a significant role in data bit transmission in digital communication. The existing line-coding techniques are designed for traditional computing network technology and power spectrum density to translate data bits into a signal using various line code waveforms. The existing line-code techniques have multiple kinds of issues, such as the utilization of bandwidth, connection synchronization (CS), the direct current (DC) component, and power spectrum density (PSD). These highlighted issues are not adequate in IoT devices in smart cities due to their small size. -
Multilevel Sequences and Line Codes
COPYRIGHT AND CITATION CONSIDERATIONS FOR THIS THESIS/ DISSERTATION o Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. o NonCommercial — You may not use the material for commercial purposes. o ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original. How to cite this thesis Surname, Initial(s). (2012) Title of the thesis or dissertation. PhD. (Chemistry)/ M.Sc. (Physics)/ M.A. (Philosophy)/M.Com. (Finance) etc. [Unpublished]: University of Johannesburg. Retrieved from: https://ujdigispace.uj.ac.za (Accessed: Date). MULTILEVEL SEQUENCES AND LINE CODES by LOUIS BOTHA Thesis submitted as partial fulfilment of the requirements for the degree MASTER OF ENGINEERING in ELECTRICAL AND ELECTRONIC ENGINEERING in the FACULTY OF ENGINEERING at the RAND AFRIKAANS UNIVERSITY SUPERVISOR: PROF HC FERREIRA MAY 1991 SUMMARY As the demand for high-speed data communications over conventional channels such as coaxial cables and twisted pairs grows, it becomes neccesary to optimize every aspect of the communication system at reasonable cost to meet this demand effectively. The choice of a line code is one of the most important aspects in the design of a communications system, as the line code determines the complexity, and thus also the cost, of several circuits in the system. It has become known in recent years that a multilevel line code is preferable to a binary code in cases where high-speed communications are desired. -
CODING for Transmission
CODING for Transmission Professor Izzat Darwazeh Head of Communicaons and Informaon System Group University College London [email protected] Acknowledgement: Dr A. Chorti, Princeton University for slides on FEC coding Dr P.Moreira, CERN, for slides on the CERN Gigabit Transmitter (GBT) Dr J. Mitchell, UCL, for the sampled music and voice. June 2011 Coding • Defini7ons and basic concepts • Source coding • Line coding • Error control coding Digital Line System Message Message source Distortion, sink interference Input Output signal and noise signal Encoder- Demodulator modulator -decoder Communication Transmitted channel Received signal signal Claude Shannon • Shannon’s Theorem predicts reliable communicaon in the presence of noise “Given a discrete, memoryless channel with capacity C, and a source with a posi8ve rate R (R<C), there exist a code such that the output of the source can be transmi@ed over the channel with an arbitrarily small probability of error.” • B is the channel bandwidth in Hz and S/N is the signal power to noise power rao ⎛⎞S CBc =+log2 ⎜⎟ 1 ⎝⎠N Types of Coding • Source Coding – Encoding the raw data • Line (or channel) Coding – Formang of the data stream to benefit transmission • Error Detec7on Coding – Detec7on of errors in the data seQuence • Error Correcon Coding – Detec7on and Correc7on of Errors • Spread Spectrum Coding – Used for wireless communicaons Signals and sources: Discrete - Con8nuous m(t) n Continuous Time and Amplitude n Discrete Time, continuous Amplitude – PAM signal n Discrete Time, and Amplitude -
Università Degli Studi Di Parma Architectural
UNIVERSITÀ DEGLI STUDI DI PARMA DIPARTIMENTO DI INGEGNERIA DELL’INFORMAZIONE PARMA (I) - VIALE DELLE SCIENZE TEL. 0521-905800 • FAX 0521-905758 Dottorato di Ricerca in Tecnologie dell’Informazione XIX Ciclo Giulia Papotti ARCHITECTURAL STUDIES OF A RADIATION-HARD TRANSCEIVER ASIC IN 0.13 um CMOS FOR DIGITAL OPTICAL LINKS IN HIGH ENERGY PHYSICS APPLICATIONS DISSERTAZIONE PRESENTATA PER IL CONSEGUIMENTO DEL TITOLO DI DOTTORE DI RICERCA GENNAIO 2007 CERN-THESIS-2007-111 //2007 εστω δε ο λογος υμων ναι ναι ου ου το δε περισσον τουτων εκ του πονηρου εστιν (Simply let your 'Yes' be 'Yes,' and your 'No,' 'No'; anything beyond this comes from the evil one.) (Matthew, 5:37) Acknowledgements I have always been concise, so all you get is a list. Here it goes… Paulo and Sandro for useful comments, critiques, discussions, explanations, feedback, questions, support… Apart from helping out in the completion of the PhD thesis in particular and PhD program in general, they have been role models who helped me in my personal professional growth. At my University in Parma, Prof. Ciampolini for being there every time I needed him, despite the amount of other engagements. I will not forget that he was the one who suggested CERN to me in the first place. Mike and all the Microelectronics group at CERN, for being such a stimulating working environment. In particular Bert, Ernest, Federico, Francois, Giovanni e Giovanni, Guido, Hugo, Kostas, Matthieu, and Rafael. Winnie needs to be specially thanked among them for reading and patiently correcting most of this thesis. Francois, Jan and Karl cannot be forgotten either, for having initiated me to CERN and the world of experimental measurements. -
Fiber Optic Communications
FIBER OPTIC COMMUNICATIONS EE4367 Telecom. Switching & Transmission Prof. Murat Torlak Optical Fibers Fiber optics (optical fibers) are long, thin strands of very pure glass about the size of a human hair. They are arranged in bundles called optical cables and used to transmit signals over long distances. EE4367 Telecom. Switching & Transmission Prof. Murat Torlak Fiber Optic Data Transmission Systems Fiber optic data transmission systems send information over fiber by turning electronic signals into light. Light refers to more than the portion of the electromagnetic spectrum that is near to what is visible to the human eye. The electromagnetic spectrum is composed of visible and near -infrared light like that transmitted by fiber, and all other wavelengths used to transmit signals such as AM and FM radio and television. The electromagnetic spectrum. Only a very small part of it is perceived by the human eye as light. EE4367 Telecom. Switching & Transmission Prof. Murat Torlak Fiber Optics Transmission Low Attenuation Very High Bandwidth (THz) Small Size and Low Weight No Electromagnetic Interference Low Security Risk Elements of Optical Transmission Electrical-to-optical Transducers Optical Media Optical-to-electrical Transducers Digital Signal Processing, repeaters and clock recovery. EE4367 Telecom. Switching & Transmission Prof. Murat Torlak Types of Optical Fiber Multi Mode : (a) Step-index – Core and Cladding material has uniform but different refractive index. (b) Graded Index – Core material has variable index as a function of the radial distance from the center. Single Mode – The core diameter is almost equal to the wave length of the emitted light so that it propagates along a single path. -
Adv. Communication Lab 6Th Sem E&C
TH ADV. COMMUNICATION LAB 6 SEM E&C • the line-coded signal can directly be put on a transmission line, in the form of variations of the voltage or current (often using differential signaling). • the line-coded signal (the "base-band signal") undergoes further pulse shaping (to reduce its frequency bandwidth) LINE CODING and then modulated (to shift its frequency bandwidth) to create the "RF signal" that can be sent through free space. Line coding consists of representing the digital signal to be • the line-coded signal can be used to turn on and off a light transported by an amplitude- and time-discrete signal that is in Free Space Optics, most commonly infrared remote optimally tuned for the specific properties of the physical channel control. (and of the receiving equipment). The waveform pattern of • the line-coded signal can be printed on paper to create a voltage or current used to represent the 1s and 0s of a digital bar code. data on a transmission link is called line encoding. The common • the line-coded signal can be converted to a magnetized types of line encoding are unipolar, polar, bipolar and spots on a hard drive or tape drive. Manchester encoding. • the line-coded signal can be converted to a pits on optical For reliable clock recovery at the receiver, one usually imposes a disc. maximum run length constraint on the generated channel Unfortunately, most long-distance communication sequence, i.e. the maximum number of consecutive ones or channels cannot transport a DC component. The DC zeros is bounded to a reasonable number. -
ETRI PHY Proposal on VLC Line Code for Illumination
September 2009 doc.: IEEE 802.15-09-0675-00-0007 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ETRI PHY Proposal on VLC Line Code for Illumination] Date Submitted: [23 September, 2009] Source: [Dae Ho Kim, Tae-Gyu Kang, Sang-Kyu Lim, Ill Soon Jang, Dong Won Han] Company [ETRI] Address [138 Gajeongno, Yuseong-gu, Daejeon, 305-700] Voice:[+82-42-860-5648], FAX: [+82-42-860-5218], E-Mail:[[email protected]] Re: [Response to call for proposals] Abstract: [This document describes a proposal of PHY line code for LED illumination ] Purpose: [Proposal to IEEE 802.15.7 VLC TG]] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. TG VLC Submission Slide 1 Dae-Ho Kim, ETRI September 2009 doc.: IEEE 802.15-09-0675-00-0007 ETRI PHY Proposal on VLC Line code for Illumination Dae Ho Kim [email protected] ETRI TG VLC Submission Slide 2 Dae-Ho Kim, ETRI September 2009 doc.: IEEE 802.15-09-0675-00-0007 Contents • ETRI PHY Considerations and Scope • Summary of ETRI PHY Proposal • Flickering issue at LED illumination • Proposed Line Code – Modified-4B5B -
Experiment Three: Line Coding
Experiment Three: Line Coding Modified from original TIMS Manual experiment by Mr. Faisel Tubbal. Objectives 1) Learn about line coding techniques by generating the codes using the LINE-CODE ENCODER and DECODER modules in the lab. 2) Display line coding techniques on oscilloscope in time and frequency domains (Spectrum) and make a comparison among these different techniques using TTL as a reference signal. 3) Using snap shot method to display line coding techniques. 4) Link the theory that you studied in lecture with the practical. 5) Observe the effect of the 180 phase shift of these techniques. Equipment Required Sequence Generator (01), Line-code Encoder (01), Buffer Amplifier (01), and Line-code Decoder. Essential Reading 1) Watch the video, read the introduction, read the tutorial questions, and read any necessary data sheets Introduction This ‘experiment’ is tutorial in nature, and serves to introduce two new modules (Line-code Encoder and Line-code Decoder). In your course work you should have covered the topic of line coding at whatever level is appropriate for you. TIMS has a pair of modules, one of which can perform a number of line code transformations on a binary TTL sequence. The other performs decoding. A- Why line coding? There are many reasons for using line coding. Each of the line codes you will be examining offers one or more of the following advantages: Spectrum shaping and relocation without modulation or filtering. This is important in telephone line applications, for example, where the transfer characteristic has heavy attenuation below 300 Hz. Bit clock recovery can be simplified.