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Dissertations / Theses on the topic 'Transmission speeds'
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Brauer, Samuel. "High Speed Electric Vehicle Transmission : Investigation how noise vibration harshness are affected at high speeds in an electric vehicle transmission." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62636.
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He, Wei. "Adaptive-rate digital speech transmission." Thesis, University of Warwick, 1993. http://wrap.warwick.ac.uk/104723/.
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Dongue, Dongue Dietrich Kevin, and Lorenzo Grosso. "The Speed-Track." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142612.
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The Speed-Track is a prototype of tracked vehicle made for material transportation on yards andgalleries. It was realized in 2011 and during the past two years has been employed mainly forload transportation on mountains. The main innovations adopted by the vehicle are about thesuspension system and the hydrostatic transmission; the combination of both allows acomfortable driving up to a maximum speed of 20 km/h.First of all, the present thesis aims to quantitatively evaluate the performances of the vehiclefrom the point of view of the suspension system and the transmission. The design of the vehicle,in fact, has been driven by the designer’s experience and no preliminary simulations and sizingcomputations have been performed.According to the outcomes of the first step as well as the feedback, some improvements to thecurrent configuration are designed and evaluated. The feedback has been submitted to theprototype’s users through a questionnaire. Improvements are supposed to be easily implementedon the existing vehicle.The outcomes of the previous steps as well as the communication with employees andentrepreneurs and the knowledge of the state of the art in terms of construction and earthmovingmachines drive the last step of the present work.The employees and entrepreneurs consulted mainly work in the agricultural sector and they havebeen contacted through web-based forums. In addition, the participation to the fair Bauma 2013allowed us to get a more complete picture of the state of the art.New solutions, starting from scratch, are designed in the last part.Keywords:Speed-Track är en prototyp av en spårfarkost utvecklad för materialtransport på gårdar och igallerior. Den konstruerades 2011 och under de senaste två åren har den främst använts för tungatransporter på berg.De huvudsakliga innovationerna av vilka farkosten använder sig av är kopplade tillsuspensionssystemet och den hydrostatiska transmissionen; kombinationen av dessa möjliggören bekväm resa i hastigheter upp till 20 km/h.Målet med detta examensarbete är framför allt att utvärdera prestandan hos farkosten medhänsyn till suspensionssystemet och transmissionen. Designen av farkosten har utformats baseratpå utvecklarens erfarenheter och inga preliminära simuleringar eller beräkningar har utförts.Baserat på resultaten från, och utvärdering av det första steget har vissa förbättringar till denrådande uppbyggnaden framtagits och utvärderats. Utvärderingen har lämnats till användare avprototypen genom ett frågeformulär.Förbättringarna skall vara lätta att tillämpa på den existerande farkosten.Resultaten från de föregående stegen tillsammans med en dialog med anställda och entreprenörersamt teknisk kunskap med avseende på konstruktion och jordfraktande maskiner driva det sistasteget av det presenterade arbetet.Medarbetare och entreprenörer härstammar framför allt från arbete inom jordbrukssektorn ochhar blivit kontaktade genom web-forum.Dessutom har medverkan under mässan Bauma 2013 givit en mer komplett bild av den rådandetekniken.Nya lösningar skapade från början utvecklas i arbetets sista del.
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Liu, Tao. "Advanced Coded Modulation for High Speed Optical Transmission." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/613291.
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In the recent years, the exponential Internet traffic growth projections place enormous transmission rate demand on the underlying information infrastructure at every level, from the long haul submarine transmission to optical metro networks. In recent years, optical transmission at 100 Gb/s Ethernet date rate has been standardized by ITU-T and IEEE forums and 400Gb/s and 1Tb/s rates per DWDM channel systems has been under intensive investigation which are expected to be standardized within next couple of years.To facilitate the implementation of 400GbE and 1TbE technologies, the new advanced modulation scheme combined with advanced forward error correction code should be proposed. Instead of using traditional QAM, we prefer to use some other modulation techniques, which are more suitable for current coherent optical transmission systems and can also deal with the channel impairments. In this dissertation, we target at improving the channel capacity by designing the new modulation formats. For the first part of the dissertation, we first describe the optimal signal constellation design algorithm (OSCD), which is designed by placing constellation points onto a two dimensional space. Then, we expand the OSCD onto multidimensional space and design its corresponding mapping rule. At last, we also develop the OSCD algorithm for different channel scenario in order to make the constellation more tolerant to different channel impairments. We propose the LLR-OSCD for linear phase noise dominated channel and NL-OSCD for nonlinear phase noise dominated channel including both self-phase modulation (SPM) and cross-phase modulation (XPM) cases. For the second part of the dissertation, we target at probability shaping of the constellation sets (non-uniform signaling). In the conventional data transmission schemes, the probability of each point in a given constellation is transmitted equally likely and the number of constellation sets is set to 2!. If the points with low energy are transmitted with larger probability then the others with large energy, the non- uniform scheme can achieve higher energy efficiency. Meanwhile, this scheme may be more suitable for optical communication because the transmitted points with large probabilities, which have small energy, suffer less nonlinearity. Both the Monte Carlo simulations and experiment demonstration of both OSCD and non-uniform signaling schemes indicate that our proposed signal constellation significantly outperforms QAM, IPQ, and sphere-packing based signal constellations.
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Richardson, Lee John. "Ultra high-speed transmission using dispersion managed solitons." Thesis, Aston University, 2001. http://publications.aston.ac.uk/7999/.
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This thesis presents the results of numerical modelling of ultra high-speed transmission using DM solitons. The theory of propagation in optical fibres is presented with specific reference to optical communication systems. This theory is then expanded to incorporate dispersion-managed transmission and the dispersion managed soliton. The first part of this work focuses on ultra high-speed dispersion managed soliton propagation in short period dispersion maps. Initially, the characteristics of dispersion managed soliton propagation in short period dispersion maps are contrasted to those of the more conventional dispersion managed regime. These properties are then utilised to investigate transmission at single channel data rates of 80 Gbit/s, 160 Gbit/s and 320 Gbit/s. For all three data rates, the tolerable limits for transmission over 1000 km, 3000 km and transoceanic distances are defined. A major limitation of these higher bit rate systems arises from the problem of noise-induced interactions, which is where the accumulation of timing jitter causes neighbouring dispersion-managed solitons to interact. In addition, the systems become more sensitive to initial conditions as the data rate increases. The second part of the work focuses on contrasting the performance of a range of propagation regimes, from quasi-linear through to soliton-like propagation at 40 Gbit/s for both single channel and WDM dispersion managed transmission. The results indicated that whilst the optimal single channel performance was achieved for soliton-like propagation, the optimal WDM performance was achieved for propagation regime that lay between quasi-linear and soliton-like.
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Kroh, Marcel. "Semiconductor mode locked laser for high-speed OTDM transmission." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=979584817.
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Muthukkumarasamy, Vallipuram. "Data assisted equalisation for high speed digital transmission systems." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334181.
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Makovejs, S. "High-speed optical fibre transmission using advanced modulation formats." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1324549/.
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The rapid growth in interactive bandwidth-hungry services demands ever higher capacity at various stages of the optical network, leading to a potential capacity exhaust, termed the capacity crunch. The main aim of the research work described in this thesis was to help solve the potential capacity crunch by exploring techniques to increase the data rate, spectral efficiency and reach of optical fibre systems. The focus was on the use of advanced signal modulation formats, including optical time-division multiplexing (OTDM), quadrature phase shift keying (QPSK), and 16-state quadrature amplitude modulation (QAM16). QPSK and QAM16 modulations formats were studied in combination with coherent detection and digital signal processing (DSP) for the compensation of transmission impairments. In addition, return-to-zero (RZ) pulses were explored to increase the tolerance towards nonlinearity for coherently detected signals, and nonlinearity compensation (NLC) through the DSP. Initially, to maximise the bit-rate, research was focused on the study of OTDM transmission at 80Gbit/s with the aim to optimise the phase difference between the adjacent OTDM channels. A new technique to achieve bit-wise phase control using a phase-stabilised fibre interferometer was proposed. Faced with a limited fibre capacity, the need to maximise the spectral efficiency became paramount, and thus the need to use phase, amplitude and polarisation domains for signal transmission. In combination with coherent detection the research focused on the performance of optical fibre systems using QPSK and QAM16 modulation formats, including their generation, transmission and detection in single-channel and WDM regimes. This included the study of the impact of pulse shapes, and the mitigation of linear and nonlinear transmission impairments with receiver-based DSP at bit-rates ranging from 42.7 to 224Gbit/s. The technique demonstrated for bit-wise phase control for OTDM was successfully used to demonstrate a new method for QAM16 signal generation. Longest transmission distances (up to 10160km in 112Gbit/s QPSK, 4240km in 112Gbit/s QAM16, and 2000km in 224Gbit/s QAM16) have been achieved with the use of NLC and RZ pulses. The efficiency of these two techniques is explored through a comprehensive set of experiments in both single-channel and WDM transmission experiments. The results can be used in the design of future optical transmission systems.
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Clément, Bertier. "Linux Kernel Packet Transmission Performance in High-speed Networks." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191435.
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The Linux Kernel protocol stack is getting more and more additions as time goes by. As new technologies arise, more functions are implemented and might result is a certain amount of bloat. However new methods have been added to the kernel to circumvent common throughput issues and to maximize overall performances, given certain circumstances. To assess the ability of the kernel to produce packets at a given rate, we will use the pktgen tool. Pktgen is a loadable kernel module dedicated to trac generation based on UDP. Its philosophy was to be in a low position in the kernel protocol stack to minimize the amount of overhead caused by usual APIs. As measurements are usually done in packets per second instead of bandwidth, the UDP protocol makes perfect sense to minimize the amount of time creating a packet. It has several options which will be investigated, and for further insights its transmission algorithm will be analysed. But a software is not just a compiled piece of code, it is a set of instructions ran on top of hardware. And this hardware may or may not comply with the design of one's software, making the execution slower than expected or in extreme cases even not functional. This thesis aims to investigate the maximum capabilities of Linux packet transmissions in high-speed networks, e.g. 10 Gigabits or 40 Gigabits. To go deeper into the understanding of the kernel behaviour during transmission we will use proling tools, as perf and the newly adopted eBPF framework.Linux Kernel protokollstacken blir fler och fler tillägg som tiden går. Som ny teknik uppstår, fler funktioner har genomförts och kan leda till en viss mängd svälla. Men nya metoder har lagts till kärnan för att kringgå vanliga genomströmning problem och att maximera den totala föreställningar, med tanke på vissa omständigheter. Att fastställa förmågan hos kärnan för att producera paket med en given hastighet, kommer vi att använda pktgen verktyget. Pktgen är en laddbar kärnmodul tillägnad trafik generation baserad på UDP. Dess filosofi var att vara i en låg position i kärnan protokollstacken för att minimera mängden av overhead orsakad av vanliga API:er. Som mätningarna görs vanligtvis i paket per sekund i stället för bandbredd, gör UDP-protokollet vettigt att minimera mängden tid på att skapa ett paket. Det har flera alternativ som kommer att undersökas, och för ytterligare insikter sin sändningsalgoritmen kommer att analyseras. Men en programvara är inte bara en kompilerad bit kod, är det en uppsättning instruktioner sprang ovanpå hårdvara. Och den här maskinvaran kan eller inte kan följa med utformningen av en programvara, vilket gör utförandet långsammare än väntat eller i extrema fall även fungerar inte. Denna avhandling syftar till att undersöka de maximala kapacitet Linux paketsändningar i höghastighetsnät, t.ex. 10 gigabit eller 40 Gigabit. För att gå djupare in i förståelsen av kärnan beteende under överföringen kommer vi att använda profilverktyg, som perf och det nyligen antagna ramen eBPF.
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Tyrberg, Andreas. "Data Transmission over Speech Coded Voice Channels." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6755.
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The voice channel in mobile communication systems have high priority and are almost always available. By using the voice channel also for data transmissions it is possible to get the same availability as for voice calls. But due to speech codecs in the voice channel, regular modems can not be used and special techniques are needed to transmit data.
This thesis presents methods to transmit data over the voice channel in a GSM, UMTS or TETRA network. The focus has been on robust data transmission rather than high data bit rates. Approaches are introduced which improve the reliability for transmissions even for systems with low rate speech codecs and channels with some distortion.
The results of the thesis are suggestions of symbol patterns and ways to create and adapt symbols for specific application and channel conditions to achieve the desired goal for the application.
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Holdstock, Thomas James. "Investigation into multiple-speed transmissions for electric vehicles." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/807562/.
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The aim of the research is to investigate multiple-speed transmissions for electric vehicles. This research is driven by the requirement to reduce emissions within the automotive industry increasing the demand for electric vehicles. The typical torque characteristics of an electric motor allow a clutchless single-speed transmission to be used, yet it is suggested by literature that the adoption of multiple-speed transmissions can benefit the energy consumption and vehicle performance. However, the published research up to date is limited in this field and lacks credible quantifiable evidence and as such motivates this research. The author developed complex non-linear models in Matlab/Simulink of case study vehicles with single and multiple-speed transmissions to analyse vehicle performance and simulate driving cycles to calculate energy consumption. The main focus of the research was based around a single and two-speed transmission developed by Vocis Drivelines and Oerlikon Graziano. The two-speed transmission has a novel mechanical layout comprising a friction clutch and sprag clutch allowing seamless gearshifts, a gearshift controller was developed as part of the research. The two transmissions were modelled in simulation with the gearshift dynamics of the two-speed transmission being simulated and considered with multiple controllers. In addition, a hardware-in-the-loop test rig was built at the University of Surrey by the author to test the prototype single and two-speed transmissions. The vehicle models were validated using the hardware-in-the-loop test rig whilst allowing performance tests and driving cycles to be carried out. The research showed that the adoption of the two-speed transmission over the single-speed transmission gave rise to reductions in energy consumption over numerous driving cycles of up to 4% for the case study vehicles. The vehicle performance was also improved with the top speed increased by 12% and the 0-100 km/h time reduced by 2%. In addition, a novel four-speed dual-motor drivetrain was investigated through simulations and compared with optimised single-speed and two-speed variants. The novel four-speed transmission delivered up to a 9% and 5% improvement in energy consumption during standard driving cycles over the single-speed and two-speed transmissions, respectively. The four-speed transmission allowed up to a 25% improvement in top speed and a 10% improvement in 0-100 km/h time over the two-speed transmission.
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Zhang, Jie. "Performance of high speed networks during bulk data transfer." Thesis, University of Kent, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294055.
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Zhou, Yiqing, and 周一靑. "Advanced techniques for high speed wireless communications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29296080.
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Huang, Hong. "Electrical two speed transmission and advanced control of electric vehicles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0002/NQ38349.pdf.
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Suntives, Asanee. "High-speed data transmission using substrate integrated waveguide-type interconnects." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32500.
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Electronic circuits have evolved into multifunctional and highly integrated systems that often require ultra-high-speed and wideband data transmission. Due to the miniaturization trend in CMOS devices, digital processors can now achieve these extreme specifications and enable operation with multi-gigahertz clock frequencies. However, fundamental interconnect limitations prevent from full accomplishment of multi-Gigabit per second data rates. Most importantly, increased conductor and dielectric losses at high frequencies can significantly reduce the channel bandwidth. In addition, crosstalk and electromagnetic interference further deteriorate the link performance, especially in compact routing networks. Therefore, alternative interconnects that enable ultra-high-speed/high-frequency signaling while maintaining signal integrity are needed. This thesis proposes a new method of high-speed data transfer by utilizing waveguide-type interconnects, which offer efficient and confined data transmission due to their low-loss and excellent isolation properties. The electromagnetic bandgap concept is employed for a systematic design of the waveguide sidewalls in order to yield negligible signal leakage in straight and meandered interconnect paths. The performance of the suggested waveguide interconnects is fully investigated from the signal integrity point of view. Due to the three-dimensional nature of the waveguide and its incompatibility with planar structures, a few transition structures are investigated, and important design parameters are identified. Models for transition structures used in 3-D integration, i.e., the via and aperture transitions, are proposed iLes circuits électroniques ont évolué pour devenir des systèmes multifonctionnels hautement intégrés requérant une transmission à très haute vitesse et de large bande. Du à la tendance de miniaturisation des composantes CMOS, les processeurs digitaux peuvent maintenant atteindre ces spécifications extrêmes et permettent par le même fait une opération à plusieurs gigahertz. Cependant, des limitations fondamentales par rapport aux interconnections empêchent une transmission de plusieurs Gigabits par seconde. Plus précisément, la croissance des pertes de conductions et diélectriques aux hautes fréquences peuvent réduire la bande de transmission de façon significative. De plus, la diaphonie et l'interférence électromagnétique contribuent également à détériorer la performance de lien, plus spécialement dans des réseaux de routage compacts. Par conséquent, une alternative aux interconnections standards est nécessaire qui permit une transmission à des fréquences ultra-rapide tout en maintenant l'intégrité des signaux. Cette thèse propose une méthode nouvelle de transmission de données à haute vitesse utilisant des interconnections à guide d'ondes permettant ainsi une transmission de données efficace grâce aux pertes relativement basses et excellentes propriétés d'isolation. Le concept de bande électromagnétique interdite est utilisé pour un design systématique des parois du guide d'ondes afin de procurer une fuite de signal négligeable dans des interconnections droites ou courbées. La performance de l'interconnexion à guide d'ondes suggérée est complètement investiguée du point de vue de l'intégrité du signal. Du fait
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Solanki, Manishkumar. "High speed protection of EHV transmission line using wavelet analysis." Thesis, Brunel University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397632.
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Cioc, Carmen Ana Beatrice. "An Elastohydrodynamic Lubrication Model for Helicopter High-Speed Transmission Components." University of Toledo / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1100618919.
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Bortnik, Bartosz Jan. "Photonic generation, transmission, and detection of high-speed electrical signals." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1459913961&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Anderson, John A. "Designing and modeling a torque and speed control transmission (TSCT)." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1194.
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Thesis (M.S.)--West Virginia University, 1999.Title from document title page. Document formatted into pages; contains viii, 69 p. : ill. Includes abstract. Includes bibliographical references (p. 68-69).
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Cioc, Carmen. "An elastohydrodynamic lubrication model for helicopter high-speed transmission components /." SeeFull Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1100618919.
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Dissertation (Ph.D.)--University of Toledo, 2004.Typescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Engineering." Bibliography: leaves 220-247.
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Chase, David Roger. "Development of an efficiency test methodology for high-speed gearboxes." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1209661381.
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Huang, Yuanliang. "Study of advanced techniques in high speed wireless transmissions." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36824653.
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Huang, Yuanliang, and 黃源良. "Study of advanced techniques in high speed wireless transmissions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36824653.
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Katugampala, Nilantha N. "Multimode speech coding below 6 kbps." Thesis, University of Surrey, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365141.
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The past two decades have witnessed a rapid expansion of the telecommunications industry. This growth has been primarily fuelled by the proliferation of the digital communication systems and services which have become easily available through wired and wireless networks. Current research trends involving integration and packetisation of voice, video and data channels into true multimedia communications, promise a similar technological revolution in the next decade. The available bandwidth in wire based terrestrial network is a relatively cheap and expandable resource. However in satellite and cellular radio systems the bandwidth is inherently limited and an expensive resource. In order to accommodate ever growing numbers of subscribers whilst maintaining high quality and low operational costs, it is essential to maximise the spectral efficiency. The research presented in this thesis has focused on the development of new source compression algorithms, tailored for human speech in order to improve the spectral efficiency of digital transmission systems. Recently there is an increasing interest on speech coding algorithms which combine various existing technologies in order to improve the speech quality .whilst maintaining the low transmission rate of the existing coding techniques. The aim of the research presented in this thesis was to develop a complete hybrid coding algorithm which combines harmonic and waveform approximating coding techniques. In order to integrate the two coding paradigms novel phase synchronisation and classification techniques were developed. The perceptual quality of the speech synthesised using the unquantised hybrid model achieves nearly transparent quality. The hybrid model was used to develop variable bit rate coders, which are particularly advantageous for voice storage, Code Division Multiple Access (CDMA) wireless networks, packet switched networks, and statistical multiplexing of speech for multi channel communications.
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Ponziani, Kevin. "Control of a manual transmission in an electric land speed vehicle." Connect to resource, 2007. http://hdl.handle.net/1811/24541.
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Thesis (Honors)--Ohio State University, 2007.Title from first page of PDF file. Document formatted into pages: contains v, 35 p.; also includes graphics. Includes bibliographical references (p. 34). Available online via Ohio State University's Knowledge Bank.
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Chai, Y. J. "Short pulse generation and manipulation in high speed data transmission systems." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597389.
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In this work, an ultrashort optical pulse source, generated through gain-switching of a semiconductor distributed feedback (DFB) laser followed by nonlinear fibre compression scheme, is experimentally demonstrated. Incorporating this with a novel fibre loop mirror, known as the dispersion-imbalanced loop mirror (DILM), simultaneous pulse compression and pedestal suppression are achieved. This generates ultrashort pulses with 350fs full-width half maximum (FWHM) and high quality extinction ratio of 30dB (instrument limited). With such short pulses, timing jitter becomes critical in avoiding signal-to-noise ratio (SNR) degradation. By employing a novel self-seeding scheme with the gain-switched laser, an instrument-limited jitter of 150fs is achieved. This makes the experimentally demonstrated femtosecond pulse source as an ideal candidate for high speed OTDM applications. The performance of the DILM as a noise suppressor is also studied. Interferometric noise, also known as incoherent crosstalk, has been a limiting factor in high-speed multichannel optical communication systems. With the use of the DILM, interferometric noise suppression is achieved with a power penalty improvement of more than 9dB. This is observed to be consistent throughout a wide range of wavelength from 1531-1560nm. This shows that using the DILM as a noise suppressor out-performes any electronic techniques. The combined DILM and self-seeding scheme provides a high quality pulse source which successfully meets the requirements of high capacity data systems. Having achieved this goal, further investigations of next generation sources, such as solid sate lasers for ultrahigh performance system applications are undertaken. A solid state mode-locked laser (CR4+:YAG), which has a 3dB spectral width of 40nm, is demonstrated for spectral slicing using an AWG. A total capacity of 1.36Tb/s (40Gb/s x 32 channels) is achieved. This is the highest capacity ever reported using a single pulse source in the C-band region. The output Q-factor of 8 to 13 demonstrates the feasibility of such innovative approach.
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Sinn, Vincent [Verfasser]. "Efficient Block Transmission Systems for High Speed Wireless Communications / Vincent Sinn." Aachen : Shaker, 2005. http://d-nb.info/1186588268/34.
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El, Fatatry M. A. "High speed optical data transmission over monomode fibre at 1300 nm." Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371211.
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Thiele, Hans Joerg. "Investigation of high-speed optical transmission in the presence of nonlinearities." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325462.
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Abdool-Rassool, Sheik Bilal. "Space-time trellis coded modulation for high speed wireless data transmission." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409319.
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TEIXEIRA, EDUARDO ARIEL DE SOUZA. "ERGONOMIC STUDY OF WEB PRODUCT INTERFACE FOCUSED ON HIGH SPEED TRANSMISSION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5090@1.
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A dissertação realiza um estudo ergonômico da interface de
produtos Web (sites) focados na transmissão de alta
velocidade, considerando as principais barreiras e
dificuldades vivênciadas pelos usuários deste tipo de
conexão durante a sua interação com o conteúdo de cunho
proprietário (plugins). O estudo tem como hipótese: o
excesso de plugins (recursos não próprios dos navegadores)
nestas interfaces limitam o acesso as páginas com conteúdo
Banda Larga e frustam os usuários quanto a carga e a
qualidade que os arquivos de vídeo e áudio destes sites
deveriam ter. A pesquisa cita os principais acontecimentos,
pesquisadores e personalidades que possibilitaram a criação
da hipermídia atual, apresentando a história do computador,
do CD-ROM, da Internet, da hipermídia e do hipertexto. Este
referêncial teórico tem como objetivo auxiliar a
compreensão das tecnologias que permitiram o surgimento da
Internet Rápida ou Banda Larga. Na primeira parte da
pesquisa descrevem-se, ainda, os conceitos de hipertexto,
hipermídia e multimídia. Em seguida se estabelece um
paralelo entre estas definições e a contextualização com as
grades dos sites com conteúdo Banda Larga e os plugins
presentes nos arquivos de conteúdo destas páginas. O
estudo apontou duas estruturas características dos sites
multimídias focados na transmissão rápida: - as páginas
hipermídia de cunho hipertextual; - as páginas hipermídia
multimídia. A segunda parte da dissertação apresenta o
delineamento da pesquisa e os métodos, técnicas e
procedimentos da pesquisa utilizados no estudo
(questionários com usuários de Internet Banda Larga, Focus
Group e Avaliação Cooperativa). Os testes realizados na
pesquisa tinham como objetivo: colher opiniões, conhecer
hábitos, descobrir dados sob a população usuária e, por
fim, observar os colaboradores interagindo com sites reais
com conteúdo Banda Larga em tarefas representativas. Estas
tarefas permitiram visualizar as principais dificuldades
dos usuários com relação ao acesso e ou consumo dos arquivos
dinâmicos proprietários. Por fim, as conclusões obtidas com
as análises dos resultados dos métodos, técnicas e
procedimentos da pesquisa apontam algumas recomendações
de projeto de sites multimídia focados na transmissão de
alta velocidade. Consideram-se: a utilização dos plugins; a
personalização dos sites; e a apresentação do conteúdo sob
a ótica do usuário. Deste modo, objetiva-se minimizar os
seus constrangimentos e barreiras durante a sua interação
com estas interfaces e sistemas.This will be an ergonomic study of web product interface (sites), focused on high speed transmission. It assesses the main barriers and difficulties experienced by the users of this type of connection during their interaction with proprietary files (plug- ins). The hypothesis of this study is that excess of plug-ins (no self resources) in these interfaces limits the access to broad band web pages, frustrating users as regards the load and quality expected from the audio and video archives. This research discusses the main stylized facts and the research that has made the present hypermedia possible. Furthermore, it presents a brief history of the computer, CD-ROM, Internet, hypermedia and hypertext. This theoretical reference aims at helping to understand the facts that led to the origins of the Broad Band or Speed Internet, and therefore presents the main technologies used for the Broad Band connection. The first part of this paper discusses the definitions of hypertext, hypermedia and multimedia. Then it establishes an analogy between such definitions and contextualization and the Broad Band site grids and plug-ins found in the archives of such web pages. The study points to two structures which are typical of speed transmission multimedia sites: - Hypermedia pages with hypertext characteristics; - Multimedia hypermedia pages. The second part of the paper discusses the methods, techniques and procedures used in the research (questionnaires with Broad Band Internet users, Focus Group and Cooperative Evaluation) as well as the research outlines. The tests performed aim at collecting data/opinions and knowing the habits of the user population, and also observing the interaction between the collaborators and real Broad Band web sites in relevant tasks. Such tasks have made it possible to visualize the main shortcomings of the users towards the access and consumption of proprietary dynamic files. Finally, the findings achieved through the results analysis of research methods, techniques and procedures lead to some multimedia sites project recommendations focused on high speed transmission. These consider using plugins, sites customization and presenting the contents from the users point of view, targeting the reduction of any constraints or barriers they may experience during their interaction with interfaces and systems.
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Liang, Helen He. "A high speed image transmission system for ultra-wideband wireless links." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53151.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Includes bibliographical references (p. 97-98).
Ultra-wideband (UWB) communication is an emerging technology that offers short range, high data rate wireless transmission, with low power consumption and low consumer cost. Operating in the 3.1 GHz - 10.6 GHz frequency band with bandwidth above 500 MHz, it is an overlay technology that can co-exist with other narrowband services in the same frequency range, thus alleviating the problem of over-crowded spectrum. In particular, pulse-based UWB technologies allows for building of ultra-low power, medium- to long-range transceivers, at the expense of data transmission rate. This thesis presents a pulse-based, non-coherent UWB wireless image transmission platform. The system features a one-way wireless link. On the transmitter side, a host PC processes the images into transmittable packets in MATLAB, and sends them to the UWB radio through an interfacing FPGA module. On the receiver side, the UWB receiver radio receivers the packets, decodes the bits, and passes them back to the receiver host PC through another interfacing FPGA module. The receiver host PC collects the decoded bits and reconstructs the original image in MATLAB. The unidirectional wireless channel is complemented by a feedback path, provided through internet connection between the two host PCs. To improve usability, graphical user interfaces are setup on both host PCs. The overall system transmits 120 x 160 uncompressed bitmap images. It achieves a maximum payload data rate of 8 Mb/s.
(cont.) It is able to transmit data reliably, with above 95% packet reception rate and below 2 x 10-5 bit error rate, for distances up to 16 meters. At 16 meters, the system has a maximum transmission data rate of 2.67 Mbps.
by Helen He Liang.
M.Eng.
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Olsson, Håkan. "Performance analysis of a low-speed high-torque hydrostatic transmission unit." Licentiate thesis, Luleå tekniska universitet, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16922.
Full textAbstract:
This thesis concerns a study of the performance of an industrial low-speed high-torque hydrostatic drive system. This type of hydrostatic transmission is commonly used in continuous operation in a wide range of heavy-duty drive applications. In many applications the transmissions have to compete with e.g. electromechanical drives, such as DC or AC electric motors combined with gearboxes. In such situations, energy efficiency is a key selection criterion in that even a small increase in the efficiency of high power industrial drives would give substantial savings. Apart from efficiency, lifetime and reliability requirements are important parameters for industrial drive systems, as unplanned stops in industrial working processes can be very costly. The work presented in this thesis is primarily focused on analysing the efficiency behaviour in the transmission, both on the system level and on the component level. Attention has also been paid to lifetime issues, with special emphasis on wear occurring in a sliding contact in a radial piston hydraulic motor. In Paper A the distribution of power losses in a variable axial piston swash plate pump is investigated. The pump under study is commonly used in stationary industrial hydrostatic transmission systems. The churning losses in the pump have been estimated experimentally by measurements in a test rig. The leakage flow and the power losses in the contacts between the piston and the cylinder and between the slipper and the swash plate respectively were simulated with the help of the simulation tool CASPAR. For the pump studied, the churning losses are significant under the operating conditions typically occurring in industrial drive applications. The simulation results indicate that the leakage to the pump casing mainly originates from the gaps between the pistons and their respective cylinders and between the slippers and swash plate. The aim of Paper B is to study two sliding contacts inside a radial piston hydraulic motor and investigate their influence on the torque and power losses. Moreover, it is investigated whether and when a change in the lubrication regime can be expected in these contacts. This is accomplished by a combination of experimental and theoretical studies, with a special focus on two lubricated sliding contacts: the distributor valve contact and the piston/cam roller contact. The theoretical analysis of the contacts indicates, among other things, that the piston/cam roller contact can enter the mixed lubrication regime at low motor speeds. At low running speeds, an increased wear rate has been noted in the contact between the cylinder bore and the piston skirt in a radial piston hydraulic motor. Paper C describes a comparative investigation into different hydraulic fluids' friction properties and wear protection abilities. To simulate the contact between the cylinder bore and the piston skirt in the hydraulic motor, tests were performed in a reciprocating test rig where the contact geometry was of the cylinder-plate type. In the model test a synthetic ester aimed at meeting the conditions in water turbine applications received a top ranking regarding both friction and wear protection properties.Godkänd; 2003; 20070217 (ysko)
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Salmony, Michael. "The OSI-based transport systems for future applications over high speed networks." Thesis, Lancaster University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255350.
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Chesmore, E. D. "A speech message transmission system for low capacity channels." Thesis, University of York, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377296.
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Longshaw, Stephen. "Data reduction for the transmission of time encoded speech." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355304.
Full textAbstract:
Time Encoded Speech (TES) transmits information concerning the duration between zero-crossings, shape and the amplitude of the signal between successive zero-crossings. This thesis examines a number of aspects of TES with the view of achieving data reductions to enable the transmission of speech, with acceptable quality and intelligibility, at low bit rates and a practical system delay. This thesis presents: (i) A study of techniques for signalling amplitude information in a TES coder. It was indicated that a minimum of the order of 1 bit per epoch is required. Diagnostic Rhyme Tests (DRT) yielded intelligibility scores of the order of 88% for algorithms employing 1 and 2 bits of amplitude information per epoch. (ii) Investigations into Median and Moving Average filtering for preprocessing the epoch duration sequences. It has been shown that such applications, which involve simple numerical smoothing, are of little value for they degrade the quality of the synthesised speech. (iii) Studies of Extremal Coding and Orthogonal Transformations for achieving data reductions in the signalling of epoch duration and, in some instances, the peak magnitude sequences. Each technique yielded a useful data reduction. The technique using Hadamard Transformations yielded the greatest data reduction, a ratio of 2:1 for the representation of the epoch duration sequences. The Hadamard Transformation also proved to be of low complexity in its implementation. (iv) A real-time simplex digital voice channel, developed during the course of this thesis, and a study of the implementation of TES and TES related coders. It is reported that speech of acceptable quality and intelligibility is achieved for a transmission rate of 10 or 15kb/s with a transmission delay of 300ms.
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Goubran, Rafik A. Carleton University Dissertation Engineering Electrical. "Efficient narrow-band speech transmission over land mobile channels." Ottawa, 1986.
Find full text
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Hu, Bing, and 胡冰. "Feedback-based two stage switch architecture for high speed router design." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43278693.
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Hu, Bing. "Feedback-based two stage switch architecture for high speed router design." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43278693.
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Johnston, B. A. "Investigation of methods for secure transmission of digital data at high speed." Thesis, University of Hertfordshire, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377565.
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From, Sebastian. "Split Screen Architecture : High speed data transmission in industrial machines and vehicles." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392099.
Full textAbstract:
This thesis examines different interfaces to suggest a concept of a split screen architecture for a company who develops and manufactures computers with integrated displays for industrial machines and vehicles. Splitting the display from the computer requires a high speed cable link between the display and the computer. This cable link must reach the mechanical and electromagnetic requirements of the intended environment the computers will operate in. Interfaces were found that can send the required video and control data over the same twisted pair or coaxial cables up to 15 m using serializers and deserializers. To send data in high speed puts tough electromagnetic requirements on the cable link as to not interfere or be interfered by nearby electrical systems. Electromagnetic properties of different cable solutions were compared to find a suitable cable that is not too expensive for the intended cable lengths. The study shows that there are interfaces available which can send several data types in a single cable so that a touch display can be positioned several meters away from the computer in demanding environments without losing the functionality it had when integrated in the computer.
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Li, Francis Feng. "Extracting room acoustic parameters from received speech signals using artificial neural networks." Thesis, University of Salford, 2002. http://usir.salford.ac.uk/42990/.
Full textAbstract:
Quantitative room acoustics over a century has accumulated a knowledge base centred around objective acoustic parameters. Realistic and accurate measurements are essential in room acoustics. Occupied measurements are difficult to undertake with current technology, yet it is well established that occupancy changes acoustics. For this reason, new measurement techniques are sought. This thesis concerns anew, machine learning based approach for measuring room acoustic parameters, which is particularly useful for occupied in-situ measurements. A set of artificial neural networks, associated pre-processors and machine learning regimes are developed to extract Reverberation Time (RT), Early Decay Time (EDT) and Speech Transmission Index (STI) from received speech signals. Utilising naturalistic sounds - speech - as excitations, the developed methods circumvent the use of unpleasant noisy test signals and therefore measurements can be made in occupied spaces in a non-invasive fashion. Given the non-invasive nature and achievable accuracy, the new methods can facilitate occupied measurements, providing an alternative to traditional methods to better quantify acoustics of spaces where speech communication is important. Much of the development work of the neural network methods focuses on the preprocessors which produce data reduced and pre-conditioned signals for the neural networks. Two different speech scenarios, separate utterances and continuous running speech are considered, leading to the development of four major neural network methods: 1. Time domain method to extract RTIEDT from separate utterances. 2. Straightforward FFT method to extract STI from short-time speech. 3. Frequency domain method to extract STI from long-time running speech. 4. Frequency domain method to extract RTIEDT from long-time running speech. These methods are all based on supervised learning. Unsupervised models, representing another important class of neural networks, are also investigated in the context of this study and are found useful as pre-processors. The model development and validations are carried out through computer simulations. Results show that better than O.ls and 0.02 resolutions in reverberation time and STI extractions are achievable based on a "one-net-one-speech" machine learning regime: a neural network trains on a particular anechoic speech to extract a designated objective parameter under the excitation of that speech. Neural network systems extracting acoustic parameters from received arbitrary speech signals without using prior knowledge of the speech stimuli, termed source independent measurements, are explored. Although the achieved accuracy is not as good as that of the standard methods and the developed neural network methods on the one-net-one-speech basis, the source independent extraction is potentially more useful in practical systems. Improving the accuracy of the source independent measurements and extending the developed methods to music signals are seemingly the most significant further work of this study.
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(9792245), Ke Ding. "Studying delay effects on complex dynamical networks." Thesis, 2011. https://figshare.com/articles/thesis/Studying_delay_effects_on_complex_dynamical_networks/13456898.
Full textAbstract:
"Complex networks have attracted increasing attention form many fields due to their theoretical importance and practical applications. Because there exist the limitations and constraints for the speeds of transmission, a signal traveling from one node to the other node in a complex network usually suffers a time delay. This thesis is to introduce some complex dynamical network models with coupling delays and to study time delay effects on complex dynamical networks"--Abstract.
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Xu, Qi-Dong, and 許祺東. "Discontinuous Speech Transmission System." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/68763875798812266972.
Full textAbstract:
碩士國立交通大學
電信研究所
85
This work is aimed to benefit from the concept of discontinuous transmission by sending the DM-encoded speech packets only during talkspurts. We first analyze the effect of transmission errors for EDM coding of autoregressive sources, and we substantiate the theoretical values with simulation values. The combined use of bit alterating rate and prediction gain allows the implementation of a voice activity detector that accurately distinguish between active and silent periods. Furthermore, a comfort noise generator is used to produce on the receiver side synthetic background noise which is not transmitted during the silent periods. This task is done by using the random noise source to excite an all-pole synthesis filter which is characterized by both the short-term energy and the linear prediction parameters of background noise signal.
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Bo-An, Yang. "High Speed Serial Transmission Media Testing." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2707200515545500.
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Yang, Bo-An, and 楊博安. "High Speed Serial Transmission Media Testing." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/11307374834461217681.
Full textAbstract:
碩士國立臺灣大學
電子工程學研究所
93
Due to the limitation of clock skew, parallel communication has reached the bottleneck in terms of data transmission. As a result, parallel communication is gradually being replaced by high-speed serial communication. TDR is effective fault diagnosis instrument for cable testing. However, it is not economical to identify whether the product is pass or fail in manufacturing testing. We proposed an economical testing technique to identify pass/fail of high speed transmission media. To reduce the complexity of testing system, the relationship model of incident signal and reflective signal is build according to frequent fault characteristics and time domain reflectometry theorem. The requirement of high-speed devices is lower because high frequency signals can be sampled by low frequency using coherent under-sampling method. The testing cost has been reduced because the requirement of high-speed devices is lower.
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Tsai, H. Z., and 蔡宏志. "An Analysis of Jitter And Transmission Quality in High Speed Serial Transmission." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/21278902143641503096.
Full textAbstract:
碩士中華大學
電機工程學系碩士班
89
This thesis describes an analysis of the effect of jitter and the transmission quality in high speed serial transmission circuit. We provide a IEEE 1394 basic circuit model and use the statistic method to analyze the transmission quality and jitter tolerance under data-strobe encoding or data/clock transmission schemes.
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Wu, Huan Wen, and 吳煥文. "Adaptive speed control of hydrostatic transmission systems." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/71202652869206488438.
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CHANG, CHIH-HSUAN, and 張誌軒. "SRTS Method in High Speed Transmission System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00149139677667260523.
Full textAbstract:
碩士國立高雄師範大學
物理學系
96
The purpose of this thesis is to study a timing recovery technology of high-speed broadband services on SDH network. The synchronous residual time stamp (SRTS) technology is selected to encode/decode and transport timing information for the broadband service. The parameters of SRTS technology for high speed applications on SDH network are analyzed, such as high definition television (HDTV). In order to minimize the jitter generated in the SRTS method, we set up the SRTS transmit and receiver block and analyze the jitter performance at the high bit rate services to determine the parameters.
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Chien-Hong, Lai, and 賴建宏. "Design of Four-Speed Gear Transmissions." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/63053326108766400235.
Full textAbstract:
碩士國立中山大學
機械工程研究所
86
Gear transmission provides higher performance of power transport and it is widely applied in motorcycle. There are many types of gear transmission. The four-speed gear transmission is most common used for it's proper arrangements of speed ratio and easy to operate. In this thesis, the four-speed gear trans-lation in motorcycle is taken to establish the system's function diagram and related design methodology. These tasks are used to build a transmission with simple structure and smooth variation when changing the speed. At first, this thesis will introduce the motorcycle's transmission and the related list-erature, which are to induce the research goals. A systematic design procedure is provided at latter to lead the design of motorcycle's gear transmission. The following tasks are focusing on the detail design of each component. At last an effective design method for configuring the motorcycle's gear transmission will be developed. The atlas of the four-speed gear transmission's initial structure can be drafted and applied to generate a proper design. The results of this work are of benefit to the development and design of new four-speed gear transmission.