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Zeitschriftenartikel zum Thema "Digital communications Reliability Mathematics":
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Yu, Liang Jun, Li Hua Sun und Cui Cui Huang. „Simulation Design on Kalman Filter with Mobile and No-Intersymbol Interference System Based on MATLAB“. Applied Mechanics and Materials 716-717 (Dezember 2014): 1267–71. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1267.
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Intersymbol Interference (ISI) problem is one of the main factors affecting the baseband transmission performance of mobile communication’s digital signal which can not only reduce the transmission quality of the information but also can result in misinformation and false pass of information and provide troubles to the user and communications. In order to minimize the error rate, we propose a new digital equalization filter and establish the basic model of the digital filter and introduce non-linear Kalman observation equation and the state equation into the model and design partial differential mathematical model of the Kalman filter and develop MATLAB solver based on the mathematical model. In order to verify the validity and reliability of Kalman filter algorithms and mathematical procedures designed in this paper, it uses MATLAB toolbox to simulate the filter of mobile crosstalk signal and obtains amplitude-frequency characteristics and time-domain characteristics before and after filtering. By comparison, we can see that the filter can eliminate the high frequency crosstalk signal which provides technical reference for the study of the problem of crosstalk between the mobile communication codes.
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Alexeyev, Alexander A., und Michael M. Green. „Secure Communications Based on Variable Topology of Chaotic Circuits“. International Journal of Bifurcation and Chaos 07, Nr. 12 (Dezember 1997): 2861–69. http://dx.doi.org/10.1142/s0218127497001941.
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A new technique for synchronization of chaotic circuits is proposed. This technique, based on varying a circuit's overall topology rather than varying a set of continuous parameters, offers a possible resolution to the tradeoff between security and synchronizability inherent in existing chaotic systems. The encryption key is represented by a mapping from a set of nodes to a set of switches in the circuit. This method significantly improves reliability and can be easily interfaced to digital control circuits.
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Kryukova, Nina I., Alexey A. Chistyakov, Tatiana I. Shulga, Leyla B. Omarova, Tatiana V. Tkachenko, Alexey K. Malakhovsky und Nigina S. Babieva. „Adaptation of higher education students’ digital skills survey to Russian universities“. Eurasia Journal of Mathematics, Science and Technology Education 18, Nr. 11 (19.10.2022): em2183. http://dx.doi.org/10.29333/ejmste/12558.
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Digital skills are essential for a technologized society. For younger generations, it has become almost necessary to have such skills. This study focuses on a valid and reliable measurement tool to determine the digital skills of university students. The research was carried out with the participation of a total of 463 university students. Exploratory factor analysis and confirmatory factor analysis were conducted to investigate the validity and reliability of the digital skills survey. Consequently, research on the validity and reliability of the digital skills survey in the Russian environment was conducted. 25 items and six factors (access to and management of digital content, digital empathy, use of digital means, digital safety, communication of digital content, creation of digital content) were identified after the analysis. Future research should employ the adapted survey to assess the level of students’ digital skills. In addition, the survey’s validity may be analyzed in the context of other cultures.
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Резник, Александр Львович, Александр Васильевич Тузиков, Александр Анатольевич Соловьев und Андрей Владиславович Торгов. „Intellectual program support for the analysis of random digital images“. Вычислительные технологии, Nr. 5(23) (02.11.2018): 70–81. http://dx.doi.org/10.25743/ict.2018.23.5.007.
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Описаны специализированные методы, разработанные авторами для решения задач обработки случайных точечных изображений, в основе которых лежат построение программных систем для проведения трудоемких аналитических выкладок и использование различных расширений классических чисел Каталана. Приведены примеры эффективного применения предложенных методов для расчета точных аналитических формул, описывающих вероятность безошибочного считывания случайных дискретных полей и цифровых изображений, проводимого сканирующей апертурой с ограниченным числом пороговых уровней. During the digital registration and subsequent processing of fast dynamic processes which have different physical nature, determination for the unknown coordinates of the point-pulse sources becomes one of the most time-consuming and algorithmically complex problems. It happens since it is necessary to satisfy the requirements for accuracy and reliability of registration in such tasks. Finding the exact analytical relationships connecting reliability of the registration with the characteristics of the physical process and the output parameters of the processing system is a problematic and very difficult task in most practically important cases, for example in the case of power of random radiation source and the size of the analyzed field. This paper proposes the methods developed by the authors for calculating the exact analytical formulas and relationships that describe the probability of error-free readout of a random point-pulse field when registration procedure is performed by a scanning aperture with a limited number of threshold levels. The specialized methods, based on the construction of software systems for laborious analytical calculations and the use of various extensions of the classical Catalan numbers are offered. In particular, procedures have been built for multidimensional integration over convex polyhedral areas with freely movable boundaries in n-dimensional space. Two probabilistic problems are also formulated, leading to an extension of the classical Catalan numbers, which turned out to be more convenient to formulate and solve in a symbolic-linguistic form.
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Babchuk, S. M., und B. S. Nezamay. „MATHEMATICAL MODEL OF SPEED DATA TRANSMISSION FROM SEGMENT LENGTH OF SPECIALIZED G3-PLC DIGITAL NETWORK“. METHODS AND DEVICES OF QUALITY CONTROL, Nr. 2(43) (24.12.2019): 120–27. http://dx.doi.org/10.31471/1993-9981-2019-2(43)-120-127.
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Power Line Communication (PLC) systems are actively evolving and becoming more and more widespread worldwide. They are used in the automation of technological processes, the organization of video surveillance systems and to control the "smart" home. The G3-PLC provides high-speed and high-reliability long-distance communication over the existing power grid. Due to the fact that G3-PLC provides the ability to transmit data including through transformers, infrastructure costs are reduced. In addition, the G3-PLC network can support IPv6, which will allow the G3-PLC to easily integrate into common IPv6-based communication lines in the future. G3-PLC-based bilateral communications networks can provide grid operators with intelligent monitoring and control capabilities. Operators will be able to monitor electricity consumption across the network in real time, apply variable tariff schedules and set limits on electricity consumption. In turn, consumers will be able to control electricity consumption in real time. By using variable tariffs, users can reduce their electricity consumption during peak use. The G3-PLC dedicated digital network can be used in process automation systems where traditional or traditional data transmission is difficult or impossible. As a result of the research, a polynomial mathematical model was found that best reflects the change in data rate depending on the length of the G3-PLC network segment. It is also found that for the simplified calculation, a linear model determined during the studies can be used. The established mathematical models of data transmission rate dependence on the segment length of the G3-PLC dedicated digital network will contribute to better design of G3-PLC-based networks.
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Timofeev, A. L., und A. Kh Sultanov. „Building a noise-tolerant code based on a holographic representation of arbi-trary digital information“. Computer Optics 44, Nr. 6 (Dezember 2020): 978–84. http://dx.doi.org/10.18287/2412-6179-co-739.
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The article considers a method of error-correcting coding based on the holographic representation of a digital signal. The message encoding process is a mathematical simulation of a hologram created in virtual space by a wave from an input signal source. The code word is a hologram of a point, it is also a one-dimensional zone ruler that carries information about the input data block in the form of an n-bit code of the coordinate of the center of the Fresnel zones. It is shown that the holographic representation of the signal has significantly greater noise immunity and allows you to restore the original digital combination when most of the code message is lost and when the encoded signal is distorted by noise several times higher than the signal level. To assess the noise immunity, the reliability of information transmission over the channel with additive white Gaussian noise is compared using the Reed-Solomon code, the Reed-Muller code, the majority code, and the holographic code. The comparative efficiency of codes in the presence of packet errors caused by the effect of fading due to multipath propagation in radio channels is considered. It is shown that holographic coding provides the correction of packet errors regardless of the length of the packet and its location in the codeword. The holographic code is of interest for transmitting information over channels with a low signal-to-noise ratio (space communications and optical communication systems using free space as a transmission channel, terrestrial, including mobile radio communications), as well as for storing information in systems exposed to ionizing radiation.
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Wang, Yuhang. „Image 3D Reconstruction and Interaction Based on Digital Twin and Visual Communication Effect“. Mobile Information Systems 2022 (23.07.2022): 1–12. http://dx.doi.org/10.1155/2022/8510369.
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With the continuous development of multimedia technology and electronic information technology, the application of 3D images has become more and more extensive, and 3D reconstruction and interactive technology have also received more and more attention from researchers. Digital twin (DT for short) is a technology that makes full use of digital twin models and real-time monitoring data to complete real-time mapping of the real world in the digital world. Visual communication (CV for short) design is a design that is expressed and communicated to the audience through a visual medium. 3D reconstruction refers to the mathematical process and computer technology that uses 2D projection to recover 3D information of an object. This essay aims to study an image 3D reconstruction and interaction method based on DT and CV and analyze the practical feasibility and practical effect of this method. This essay proposes a model for image 3D reconstruction and interaction, which combines DT and CV effects and conducts a system simulation test for the model. The simulation is carried out on the three-dimensional reconstruction of the craniomaxillofacial area in medicine, and the reconstruction process is relatively smooth. And the final simulation test shows that the maximum CPU usage rate of the system during the rebuilding process is about 50%, which is relatively stable. The average CPU usage is about 30%, the overall system energy consumption is low, the lower limit of the overall SNR of the image is 57, and the upper limit is 62. The image quality of the reconstruction process is good, and the overall system reliability is high, which is feasible.
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Tyncherov, Kamil T., Vyacheslav Sh Mukhametshin, Victor A. Krasnobaev und Maria V. Selivanova. „Error Control Coding Algorithms in High Reliability Telemetry Systems“. Symmetry 14, Nr. 7 (01.07.2022): 1363. http://dx.doi.org/10.3390/sym14071363.
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In the oil and gas industry, in the process of drilling support (geosteering) and well telemetry, there is a problem of transmitting reliable information via wireless communication channels. The quality of such communication, as a rule, suffers due to the presence of errors caused by interference. As the depth of the well increases, the problem becomes more extensive. In order to solve the problem, it is proposed to choose noise-resistant coding in the system of residual classes. This system parallelizes the execution of arithmetic operations, has corrective abilities and organically adapts to the neural network basis of intelligent field management. At the same time, there are constraining factors for the mass application of the RNS; for example, difficulties in implementing non-modular procedures, forward and reverse coding, and some difficulties in identifying and correcting errors. That is why the task of improving the RNS seems relevant not only for oil and gas complexes, but also for any digital signal processing applications focused on intelligent neural network management on the basis of non-positional computing. The material of the article is limited to the study of the noise immunity of linear codes of the deduction system and the development of algorithms for detecting and correcting errors.
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Ben-Ami, Lee, und Ido Bachelet. „A Thought-Operated Digital Random-Access Memory“. Computational Intelligence and Neuroscience 2019 (09.06.2019): 1–8. http://dx.doi.org/10.1155/2019/9684140.
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The capacity and reliability of biological memory could be exceeded by a constantly growing flux of information to remember and operate by. Yet, our memory is fragile and could be easily impaired, and the prevalence of memory disorders is increasing in correlation with the population’s mean age. As expected, auxiliary memory devices (such as writing pads and computers) are abundant but are operated indirectly using significant effort compared with biological memory. We report a working prototype of a simplified, 4 KB random-access memory (RAM) that can be written to or read from using thought and could be embedded more seamlessly than other artificial memory aids. The system analyses EEG signals to extract attention levels, which trained subjects can use to write messages into an RFID sticker, or read from it on a display. We describe basic modes of using memory by a single subject, emulate common forms of social communication using this system, and highlight new forms of social usage and allocation of memories that are linked to specific persons. This preliminary prototype highlights the technical feasibility and the possibilities of implantable thought-operated memory devices and could be developed further to provide seamless aid to people suffering from memory disorders in the near future.
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Liu, Xiyang, Lei Fan, Liming Wang und Sha Meng. „Multiobjective Reliable Cloud Storage with Its Particle Swarm Optimization Algorithm“. Mathematical Problems in Engineering 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/9529526.
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Information abounds in all fields of the real life, which is often recorded as digital data in computer systems and treated as a kind of increasingly important resource. Its increasing volume growth causes great difficulties in both storage and analysis. The massive data storage in cloud environments has significant impacts on the quality of service (QoS) of the systems, which is becoming an increasingly challenging problem. In this paper, we propose a multiobjective optimization model for the reliable data storage in clouds through considering both cost and reliability of the storage service simultaneously. In the proposed model, the total cost is analyzed to be composed of storage space occupation cost, data migration cost, and communication cost. According to the analysis of the storage process, the transmission reliability, equipment stability, and software reliability are taken into account in the storage reliability evaluation. To solve the proposed multiobjective model, a Constrained Multiobjective Particle Swarm Optimization (CMPSO) algorithm is designed. At last, experiments are designed to validate the proposed model and its solution PSO algorithm. In the experiments, the proposed model is tested in cooperation with 3 storage strategies. Experimental results show that the proposed model is positive and effective. The experimental results also demonstrate that the proposed model can perform much better in alliance with proper file splitting methods.
Dissertationen zum Thema "Digital communications Reliability Mathematics":
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Britton, Matthew Scott. „Stochastic task scheduling in time-critical information delivery systems“. Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phb8629.pdf.
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"January 2003" Includes bibliographical references (leaves 120-129) Presents performance analyses of dynamic, stochastic task scheduling policies for a real- time-communications system where tasks lose value as they are delayed in the system.
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Ellis, David Lambert. „The reliability and efficiency of serial digital data in industrial communications“. Thesis, Liverpool John Moores University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247334.
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Hassanien, Mohamed A. M. „Error rate performance metrics for digital communications systems“. Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa42497.
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In this thesis, novel error rate performance metrics and transmission solutions are investigated for delay limited communication systems and for co-channel interference scenarios. The following four research problems in particular were considered. The first research problem is devoted to analysis of the higher order ergodic moments of error rates for digital communication systems with time- unlimited ergodic transmissions and the statistics of the conditional error rates of digital modulations over fading channels are considered. The probability density function and the higher order moments of the conditional error rates are obtained. Non-monotonic behavior of the moments of the conditional bit error rates versus some channel model parameters is observed for a Ricean distributed channel fading amplitude at the detector input. Properties and possible applications of the second central moments are proposed. The second research problem is the non-ergodic error rate analysis and signaling design for communication systems processing a single finite length received sequence. A framework to analyze the error rate properties of non-ergodic transmissions is established. The Bayesian credible intervals are used to estimate the instantaneous bit error rate. A novel degree of ergodicity measure is introduced using the credible interval estimates to quantify the level of ergodicity of the received sequence with respect to the instantaneous bit error rate and to describe the transition of the data detector from the non-ergodic to ergodic zone of operation. The developed non-ergodic analysis is used to define adaptive forward error correction control and adaptive power control policies that can guarantee, with a given probability, the worst case instantaneous bit error rate performance of the detector in its transition fi'om the non-ergodic to ergodic zone of operation. In the third research problem, novel retransmission schemes are developed for delay-limited retransmissions. The proposed scheme relies on a reliable reverse link for the error-free feedback message delivery. Unlike the conventional automatic repeat request schemes, the proposed scheme does not require the use of cyclic redundancy check bits for error detection. In the proposed scheme, random permutations are exploited to locate the bits for retransmission in the predefined window within the packet. The retransmitted bits are combined using the maximal-ratio combining. The complexity-performance trade-offs of the proposed scheme is investigated by mathematical analysis as well as computer simulations. The bit error rate of the proposed scheme is independent of the packet length while the throughput is dependent on the packet length. Three practical techniques suitable for implementation are proposed. The performance of the proposed retransmission scheme was compared to the block repetition code corresponding to a conventional ARQ retransmission strategy. It was shown that, for the same number of retransmissions, and the same packet length, the proposed scheme always outperforms such repetition coding, and, in some scenarios, the performance improvement is found to be significant. Most of our analysis has been done for the case of AWGN channel, however, the case of a slow Rayleigh block fading channel was also investigated. The proposed scheme appears to provide the throughput and the BER reduction gains only for the medium to large SNR values. Finally, the last research problem investigates the link error rate performance with a single co-channel interference. A novel metric to assess whether the standard Gaussian approximation of a single interferer underestimates or overestimates the link bit error rate is derived. This metric is a function of the interference channel fading statistics. However, it is otherwise independent of the statistics of the desired signal. The key step in derivation of the proposed metric is to construct the standard Gaussian approximation of the interference by a non-linear transformation. A closed form expression of the metric is obtained for a Nakagami distributed interference fading amplitude. Numerical results for the case of Nakagami and lognormal distributed interference fading amplitude confirm the validity of the proposed metric. The higher moments, interval estimators and non-linear transformations were investigated to evaluate the error rate performance for different wireless communication scenarios. The synchronization channel is also used jointly with the communication link to form a transmission diversity and subsequently, to improve the error rate performance.
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Li, Cheng, und 李鋮. „Carrier frequency offset estimation for multicarrier communications“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29725331.
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Yi, Eun-jik. „Applications of wavelets to nonlinear wave analysis and digital communication /“. Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
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Giddens, Spencer. „Applications of Mathematical Optimization Methods to Digital Communications and Signal Processing“. BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8601.
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Mathematical optimization is applicable to nearly every scientific discipline. This thesis specifically focuses on optimization applications to digital communications and signal processing. Within the digital communications framework, the channel encoder attempts to encode a message from a source (the sender) in such a way that the channel decoder can utilize the encoding to correct errors in the message caused by the transmission over the channel. Low-density parity-check (LDPC) codes are an especially popular code for this purpose. Following the channel encoder in the digital communications framework, the modulator converts the encoded message bits to a physical waveform, which is sent over the channel and converted back to bits at the demodulator. The modulator and demodulator present special challenges for what is known as the two-antenna problem. The main results of this work are two algorithms related to the development of optimization methods for LDPC codes and the two-antenna problem. Current methods for optimization of LDPC codes analyze the degree distribution pair asymptotically as block length approaches infinity. This effectively ignores the discrete nature of the space of valid degree distribution pairs for LDPC codes of finite block length. While large codes are likely to conform reasonably well to the infinite block length analysis, shorter codes have no such guarantee. Chapter 2 more thoroughly introduces LDPC codes, and Chapter 3 presents and analyzes an algorithm for completely enumerating the space of all valid degree distribution pairs for a given block length, code rate, maximum variable node degree, and maximum check node degree. This algorithm is then demonstrated on an example LDPC code of finite block length. Finally, we discuss how the result of this algorithm can be utilized by discrete optimization routines to form novel methods for the optimization of small block length LDPC codes. In order to solve the two-antenna problem, which is introduced in greater detail in Chapter 2, it is necessary to obtain reliable estimates of the timing offset and channel gains caused by the transmission of the signal through the channel. The timing offset estimator can be formulated as an optimization problem, and an optimization method used to solve it was previously developed. However, this optimization method does not utilize gradient information, and as a result is inefficient. Chapter 4 presents and analyzes an improved gradient-based optimization method that solves the two-antenna problem much more efficiently.
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Shepherd, David. „Optimisation of iterative multi-user receivers using analytical tools /“. View thesis entry in Australian Digital Theses Program, 2008. http://thesis.anu.edu.au/public/adt-ANU20081114.221408/index.html.
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Vafi, Sina. „On the design of turbo codes with convolutional interleavers“. Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060515.092832/index.html.
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Shaheem, Asri. „Iterative detection for wireless communications“. University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0223.
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[Truncated abstract] The transmission of digital information over a wireless communication channel gives rise to a number of issues which can detract from the system performance. Propagation effects such as multipath fading and intersymbol interference (ISI) can result in significant performance degradation. Recent developments in the field of iterative detection have led to a number of powerful strategies that can be effective in mitigating the detrimental effects of wireless channels. In this thesis, iterative detection is considered for use in two distinct areas of wireless communications. The first considers the iterative decoding of concatenated block codes over slow flat fading wireless channels, while the second considers the problem of detection for a coded communications system transmitting over highly-dispersive frequency-selective wireless channels. The iterative decoding of concatenated codes over slow flat fading channels with coherent signalling requires knowledge of the fading amplitudes, known as the channel state information (CSI). The CSI is combined with statistical knowledge of the channel to form channel reliability metrics for use in the iterative decoding algorithm. When the CSI is unknown to the receiver, the existing literature suggests the use of simple approximations to the channel reliability metric. However, these works generally consider low rate concatenated codes with strong error correcting capabilities. In some situations, the error correcting capability of the channel code must be traded for other requirements, such as higher spectral efficiency, lower end-to-end latency and lower hardware cost. ... In particular, when the error correcting capabilities of the concatenated code is weak, the conventional metrics are observed to fail, whereas the proposed metrics are shown to perform well regardless of the error correcting capabilities of the code. The effects of ISI caused by a frequency-selective wireless channel environment can also be mitigated using iterative detection. When the channel can be viewed as a finite impulse response (FIR) filter, the state-of-the-art iterative receiver is the maximum a posteriori probability (MAP) based turbo equaliser. However, the complexity of this receiver's MAP equaliser increases exponentially with the length of the FIR channel. Consequently, this scheme is restricted for use in systems where the channel length is relatively short. In this thesis, the use of a channel shortening prefilter in conjunction with the MAP-based turbo equaliser is considered in order to allow its use with arbitrarily long channels. The prefilter shortens the effective channel, thereby reducing the number of equaliser states. A consequence of channel shortening is that residual ISI appears at the input to the turbo equaliser and the noise becomes coloured. In order to account for the ensuing performance loss, two simple enhancements to the scheme are proposed. The first is a feedback path which is used to cancel residual ISI, based on decisions from past iterations. The second is the use of a carefully selected value for the variance of the noise assumed by the MAP-based turbo equaliser. Simulations are performed over a number of highly dispersive channels and it is shown that the proposed enhancements result in considerable performance improvements. Moreover, these performance benefits are achieved with very little additional complexity with respect to the unmodified channel shortened turbo equaliser.
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Pratt, Brian Hogan. „Analysis and Mitigation of SEU-induced Noise in FPGA-based DSP Systems“. BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2482.
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This dissertation studies the effects of radiation-induced single-event upsets (SEUs) on digital signal processing (DSP) systems designed for field-programmable gate arrays (FPGAs). It presents a novel method for evaluating the effects of radiation on DSP and digital communication systems. By using an application-specific measurement of performance in the presence of SEUs, this dissertation demonstrates that only 5-15% of SEUs affecting a communications receiver (i.e. 5-15% of sensitive SEUs) cause critical performance loss. It also reports that the most critical SEUs are those that affect the clock, global reset, and most significant bits (MSBs) of computation. This dissertation also demonstrates reduced-precision redundancy (RPR) as an effective and efficient alternative to the popular triple modular redundancy (TMR) for FPGA-based communications systems. Fault injection experiments show that RPR can improve the failure rate of a communications system by over 20 times over the unmitigated system at a cost less than half that of TMR by focusing on the critical SEUs. This dissertation contrasts the cost and performance of three different variations of RPR, one of which is a novel variation developed here, and concludes that the variation referred to as "Threshold RPR" is superior to the others for FPGA systems. Finally, this dissertation presents several methods for applying Threshold RPR to a system with the goal of reducing mitigation cost and increasing the system performance in the presence of SEUs. Additional fault injection experiments show that optimizing the application of RPR can result in a decrease in critical SEUs by as much 65% at no additional hardware cost.
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Albania) NATO Advanced Study Institute on New Challenges in Digital Communications (2008 Vlore. Algebraic aspects of digital communications. Amsterdam: IOS Press, 2009.
Buchteile zum Thema "Digital communications Reliability Mathematics":
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Qian, Hong, Yaqi Gu, Gaofu Yu und Shanjin Wu. „Research on Operational Reliability of Digital Control Device of Nuclear Pressurizer Based on Dynamic Fault Tree“. In Communications in Computer and Information Science, 46–57. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2381-2_5.
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Li, Yuan-hui, Xia Liu und Hai-yun Han. „The Reliability and Validity Analysis of Questionnaire Survey on the Mathematics Teaching Quality in Higher Vocational Colleges“. In Communications in Computer and Information Science, 594–604. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2206-8_50.
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Santos-Trigo, Manuel, Isaid Reyes-Martínez und Daniel Aguilar-Magallón. „Digital Technologies and a Modeling Approach to Learn Mathematics and Develop Problem Solving Competencies“. In Communications in Computer and Information Science, 193–206. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42147-6_17.
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Lopes, J. Bernardino, und Cecília Costa. „Digital Resources in Science, Mathematics and Technology Teaching – How to Convert Them into Tools to Learn“. In Communications in Computer and Information Science, 243–55. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20954-4_18.
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Greiner-Petter, André, Howard S. Cohl, Abdou Youssef, Moritz Schubotz, Avi Trost, Rajen Dey, Akiko Aizawa und Bela Gipp. „Comparative Verification of the Digital Library of Mathematical Functions and Computer Algebra Systems“. In Tools and Algorithms for the Construction and Analysis of Systems, 87–105. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99524-9_5.
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AbstractDigital mathematical libraries assemble the knowledge of years of mathematical research. Numerous disciplines (e.g., physics, engineering, pure and applied mathematics) rely heavily on compendia gathered findings. Likewise, modern research applications rely more and more on computational solutions, which are often calculated and verified by computer algebra systems. Hence, the correctness, accuracy, and reliability of both digital mathematical libraries and computer algebra systems is a crucial attribute for modern research. In this paper, we present a novel approach to verify a digital mathematical library and two computer algebra systems with one another by converting mathematical expressions from one system to the other. We use our previously developed conversion tool (referred to as "Image missing" ) to translate formulae from the NIST Digital Library of Mathematical Functions to the computer algebra systems and . The contributions of our presented work are as follows: (1) we present the most comprehensive verification of computer algebra systems and digital mathematical libraries with one another; (2) we significantly enhance the performance of the underlying translator in terms of coverage and accuracy; and (3) we provide open access to translations for and of the formulae in the NIST Digital Library of Mathematical Functions.
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Hassan, Md Imrul, Hai L. Vu und Taka Sakurai. „Medium Access Protocols for Cooperative Collision Avoidance in Vehicular Ad-Hoc Networks“. In Digital Rights Management, 354–75. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2136-7.ch017.
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It is envisaged that supporting vehicle-to-vehicle and vehicle-to-infrastructure communications with a Vehicular Ad-Hoc Network (VANET) can improve road safety and increase transportation efficiency. Among the candidate applications of VANETs, cooperative collision avoidance (CCA) has attracted considerable interest as it can significantly improve road safety. Due to the ad hoc nature of these highly dynamic networks, no central coordination or handshaking protocol can be assumed and safety applications must broadcast information of interest to many surrounding cars by sharing a single channel in a distributed manner. This gives rise to one of the key challenges in vehicle-to-vehicle communication systems, namely, the development of an efficient and reliable medium access control (MAC) protocol for CCA. In this chapter, we provide an overview of proposed MAC protocols for VANETs and describe current standardization activities. We then focus on the performance of the IEEE 802.11 carrier sense multiple access (CSMA) based MAC protocol that is being standardized by the IEEE standards body for VANET applications. In particular, we review prominent existing analytical models and study their advantages, disadvantages and their suitability for performance evaluation of the MAC protocol for VANETs. After a discussion of the shortcomings of these models, we develop a new analytical model in the second half of the chapter. Explicit expressions are derived for the mean and standard deviation of the packet delay, as well as for the packet delivery ratio (PDR) at the MAC layer in an unsaturated network formed by moving vehicles on a highway. We validate the analytical results using extensive simulations and show that good accuracy can be achieved with the proposed model for a range of topologies and traffic load conditions. More importantly, using the model, we show that hidden terminals can have a severe, detrimental impact on the PDR, which may compromise the reliability required for safety applications.
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Yigitcanlar, Tan, und Scott Baum. „E-Government and the Digital Divide“. In Global Information Technologies, 2204–13. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-939-7.ch160.
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Many governments world wide are attempting to increase accountability, transparency, and the quality of services by adopting information and communications technologies (ICTs) to modernize and change the way their administrations work. Meanwhile e-government is becoming a significant decision-making and service tool at local, regional and national government levels. The vast majority of users of these government online services see significant benefits from being able to access services online. The rapid pace of technological development has created increasingly more powerful ICTs that are capable of radically transforming public institutions and private organizations alike. These technologies have proven to be extraordinarily useful instruments in enabling governments to enhance the quality, speed of delivery and reliability of services to citizens and to business (VanderMeer & VanWinden, 2003). However, just because the technology is available does not mean it is accessible to all. The term digital divide has been used since the 1990s to describe patterns of unequal access to ICTs—primarily computers and the Internet—based on income, ethnicity, geography, age, and other factors. Over time it has evolved to more broadly define disparities in technology usage, resulting from a lack of access, skills, or interest in using technology. This article provides an overview of recent literature on e-government and the digital divide, and includes a discussion on the potential of e-government in addressing the digital divide.
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„Game Theory for Smart Grid“. In Advances in Wireless Technologies and Telecommunication, 146–57. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-6050-2.ch005.
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A smart grid is a modernized electrical grid that uses analog or digital information and communications technology to gather and act on information, such as information about the behaviors of suppliers and consumers, in an automated fashion to improve the efficiency, reliability, economics, and sustainability of the production and distribution of electricity. Therefore, smart grid is an evolved grid system that manages electricity demand in a sustainable, reliable, and economic manner, built on advanced infrastructure and tuned to facilitate the integration of all involved. Roll-out of smart grid technology also implies a fundamental re-engineering of the electricity services industry, although typical usage of the term is focused on the technical infrastructure. This chapter explores this idea.
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Maruthakutti, Maheswari, Loganathan Nachimuthu und Suthanthira Vanitha N. „Role of Smart Metering and Implementation Issues in Smart Grid“. In Advances in Computer and Electrical Engineering, 29–47. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4027-5.ch002.
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Smart grid provides the digital technology that allows for two-way communication between the utility and the customers. The smart grid consists of controls, computers, automation, and new technologies and equipment working together. The smart grid will move the energy industry into a new era of reliability, availability, and efficiency with economic and environmental health. A smart meter plays a major role in the smart grid and it is an electronic device that measures and records the energy consumption. It enables two-way communication between the meter and the supplier through advanced metering infrastructure (AMI). The mode of communication is enabled by either wireless or wired. The wireless communication includes Wi-Fi, wireless mesh networks, Zig Bee, cellular communications, and low power range Wi-Fi. This chapter deliberates about the evolution of electricity metering, major components of smart meter, communication infrastructure and protocols for smart metering, demand-side integration, recent developments, issues faced and solutions, merits and demerits.
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Swade, Doron. „The computer boom“. In The History of Computing: A Very Short Introduction, 92—C5.P55. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/actrade/9780198831754.003.0005.
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Abstract This chapter traces the emergence of the computer from the workshop into the workplace. It describes the role of the corporate mainframe from the early 1950s to the late 1970s and IBM’s dominance. It starts with IBM’s response to the threat, to its office automation interests, posed by UNIVAC and a new generation of electronic computers. It describes the impetus given to innovation by the Cold War through the Whirlwind project and the SAGE air defence system for the US military. It describes innovative technologies including magnetic-core memory, interactive screen display, reliability protocols and techniques, double-sided printed circuit boards, real-time operating software, duplex standby, digital communication over standard telephone lines, time sharing, and software/programming disciplines. The account shows how SAGE gave IBM a head start in computing, networking, and communications, and how the migration of expertise into the private sector fuelled commercial spin-offs. It describes two sectors transformed by the new technologies: automated banking (ERMA) and the introduction of the credit card, and airline reservation (SABRE). It describes the shakeout in the computer industry in the 1960s in which IBM saw off its competitors (the ‘seven dwarves’) to secure its dominance following the radical introduction of the System/360.
Konferenzberichte zum Thema "Digital communications Reliability Mathematics":
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Scheer, Gary, und Roy Moxley. „Digital Communications Improve Contact I/O Reliability“. In 2006 Power Systems Conference: Advanced Metering, Protection, Control, Communication, and Distributed Resources. IEEE, 2006. http://dx.doi.org/10.1109/psamp.2006.285406.
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Wang, Yang, Fuqiang Liu, Lijun Zu und Nguyen Ngoc Van. „Reliability Analysis of Safety Intervehicle Communications in a Highway Environment“. In 2017 International Conference on Applied Mathematics, Modeling and Simulation (AMMS 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/amms-17.2017.88.
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Yang, Hongqi, Zhe Lai, Yujie Liu, Ning Hu, Bin Diao und Yong Pan. „Research on Modeling Method of System Reliability Digital Twin“. In 2021 2nd International Conference on Electronics, Communications and Information Technology (CECIT). IEEE, 2021. http://dx.doi.org/10.1109/cecit53797.2021.00179.
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Beg, Azam, Faheem Ahmed, Amr Elchouemi und Ajmal Beg. „Parameters for Modeling Digital Circuit Reliability: A Statistical Perspective“. In Visualization, Imaging and Image Processing / 783: Modelling and Simulation / 784: Wireless Communications. Calgary,AB,Canada: ACTAPRESS, 2012. http://dx.doi.org/10.2316/p.2012.783-012.
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Aziz, Tian Abdul, und Ervin Azhar. „The validity and reliability study of the Indonesian version of the sources of mathematics self-efficacy scale“. In THE 2ND SCIENCE AND MATHEMATICS INTERNATIONAL CONFERENCE (SMIC 2020): Transforming Research and Education of Science and Mathematics in the Digital Age. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0041691.
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Mathews, Oommen, Hakduran Koc und Muberra N. Akcaman. „Improving reliability through fault propagation scope in embedded systems“. In 2015 Fifth International Conference on Digital Information Processing and Communications (ICDIPC). IEEE, 2015. http://dx.doi.org/10.1109/icdipc.2015.7323045.
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Mekloi, Narongrit. „Theoretical reliability of dual GPS antennas over wireless fading channel“. In 2015 Fifth International Conference on Digital Information Processing and Communications (ICDIPC). IEEE, 2015. http://dx.doi.org/10.1109/icdipc.2015.7323011.
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Li, Erlei, Jialin Zhang und Tonglei Xu. „Design of a 4-channel high-reliability video processing module“. In Second International Conference on Digital Signal and Computer Communications (DSCC 2022), herausgegeben von Sandeep Saxena. SPIE, 2022. http://dx.doi.org/10.1117/12.2641386.
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Huttunen, Heikki, Mikko Valkama, Jukka Talvitie und Merja Laaksonen. „Motivating the mathematics studies by real-life examples of signal processing and communications engineering“. In 2011 Digital Signal Processing and Signal Processing Education Meeting (DSP/SPE). IEEE, 2011. http://dx.doi.org/10.1109/dsp-spe.2011.5739213.
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Dabboussi, Abdallah, Raed Kouta, Jaafar Gaber, Maxime Wack, Bachar El Hassan und Lina Nachabeh. „Dependability overview for autonomous vehicles and reliability analysis for basic safety messages“. In 2018 Sixth International Conference on Digital Information, Networking, and Wireless Communications (DINWC). IEEE, 2018. http://dx.doi.org/10.1109/dinwc.2018.8357001.
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Berichte der Organisationen zum Thema "Digital communications Reliability Mathematics":
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Bustelo, Monserrat, Pablo Egana-delSol, Laura Ripani, Nicolas Soler und Mariana Viollaz. Automation in Latin America: Are Women at Higher Risk of Losing Their Jobs? Inter-American Development Bank, August 2020. http://dx.doi.org/10.18235/0002566.
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New technological trends, such as digitization, artificial intelligence and robotics, have the power to drastically increase economic output but may also displace workers. In this paper we assess the risk of automation for female and male workers in four Latin American countries Bolivia, Chile, Colombia and El Salvador. Our study is the first to apply a task-based approach with a gender perspective in this region. Our main findings indicate that men are more likely than women to perform tasks linked to the skills of the future, such as STEM (science, technology, engineering and mathematics), information and communications technology, management and communication, and creative problem-solving tasks. Women thus have a higher average risk of automation, and 21% of women vs. 19% of men are at high risk (probability of automation greater than 70%). The differential impacts of the new technological trends for women and men must be assessed in order to guide the policy-making process to prepare workers for the future. Action should be taken to prevent digital transformation from worsening existing gender inequalities in the labor market.
