Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Bit Errors"”.
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Probabilistic Approach to Avoid Uncorrectable Bit Errors in Storage Systems
… codes (ECC) can recover the majority of the errors, a non-negligible portion of them escape ECC, referred to as uncorrectable errors. As the scale of storage systems increases, the mean time between uncorrectable errors is reduced from months to hours, necessitating efficient ways to detect …
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Performance improvement in mobile ad-hoc networks.
… technique research focuses only on random-bit errors, the proposed technique employs both random bit errors and hidden-node collisions. The analytical models based on Markov-chain model shows that the optimal fragmentation technique can effectively reduce the number of retransmissions …
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Multiple bit error correcting architectures over finite fields
… thesis proposes techniques to mitigate multiple bit errors in GF arithmetic circuits. As GF arithmetic circuits such as multipliers constitute the complex and important functional unit of a crypto-processor, making them fault tolerant will improve the reliability of circuits that are employed in …
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IMPROVING THE HAFNIA-BASED RESISTIVE RANDOM-ACCESS MEMORY THROUGH MATERAL ENGINEERING
… RESISTANCE STATES AND COULD POSSIBLY RESULT IN BIT ERRORS. THIS THESIS AIMS TO ADDRESS THE ISSUE OF LARGE RESISTANCE VARIATION IN HFO2-BASED REDOX RRAMS BY INCREASING THE MEMORY WINDOW AND/OR REDUCING THE VARIATION. USING CMOS AVAILABLE PROCESSES LIKE SILICIDATION AND ATOMIC LAYER DEPOSITION …
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Monte Carlo based channel estimation and evaluation for 5G millimeter-wave systems
… have been developed in an attempt to reduce bit errors in the received data and maximize the system throughput. Methods can be as basic as performing division and averaging of known transmitted values to estimate the channel. Other channel estimators have been designed using techniques …
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Improving packet delivery efficiency using multi-radio diversity in wireless LANs
… Local Area Networks (WLANs) often suffer from bit errors that arise from the notoriously complex and time-varying signal propagation characteristics of the wireless medium. A number of physical factors such as attenuation and multi-path are prevalent indoors and can lead to high bit-error rates …
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Analysis Of Time Synchronization Errors In High Data Rate Ultrawideban
… data at high speeds, exceeding hundreds of megabits per second over typical distances of 10 meters or less. The purpose of this Thesis is to estimate the timing accuracies required with such systems in order to achieve Bit Error Rates (BER) of the order of magnitude of 10-12 and thereby avoid …
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Wireless personal area networks and free-space optical links
… is developed by considering the presence of bit errors. Based on this model, the effect of propagation delay on the link through put is investigated. An optimization study is also carried out to maximize the link throughput. FSO (outdoor infrared) links are often characterized by high speed …
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Aspects of burst errors in digital telecommunications transmission systems.
… Results indicated that the mean metric of bit errors behaves in a similar manner to that for code errors. It is proposed that in service, monitoring of code error mean metrics would enable changes in the environment of the system to be monitored. This would give an early indication of …
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End-to-end data reliability in optical flow switching
… the channel has non-zero probability of bit errors that may corrupt the useful data or flows transmitted. In this thesis, we focus on the end-to-end reliable data delivery part of the Transport Layer protocol and propose effective and efficient algorithms to ensure error-free end-to-end …
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Spinal codes
… in a natural way, without requiring any explicit bit rate selection. The key idea in the code is the sequential application of a pseudo-random hash function to the message bits, to produce a sequence of coded symbols for transmission. This encoding ensures that two input messages that differ in …
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The application of forward error correction techniques in wireless ATM
… schemes and interleavers to combat the impact of bit errors on the performance of the link. The following error control strategies were considered : 1. A stand alone fixed rate Reed-Solomon encoder/decoder with automatic repeat request. 2. A concatenated Reed-Solomon, convolution encoder/decoder …
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Adaptive multilevel quadrature amplitude radio implementation in programmable logic
… at low signal-to-noise ratios due to bit errors and packet retransmission. To obtain a more “robust” physical layer, broadband systems are employing multilevel QAM (M-QAM) to mitigate this reduction in throughput by adapting the QAM modulation level to maintain acceptable packet error …
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Feasibility of Spectrum Sharing Between Airborne Weather Radar and Wireless Local Area Networks
… share spectrum with airborne weather radar. Bit errors in wireless local area network links caused by airborne weather radar interference do not significantly decrease the performance of the wireless local area network system. The distribution of interference outside of the airborne weather …
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Design of the control systems operations for the Iridium satellite system
… satellite system is comprised of 66 Low Earth Orbiting (LEO) satellites which are able to accommodate Iridium handsets or existing telephone links. These satellites are monitored and controlled by ground control facilities for approximately 6 years ( the estimated life of the vehicles) and are …
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Performance of error correcting codes with random and burst errors
The errors that can occur in a computer system during data reading or recording in the memory can be of different types depending upon the memory organization. They can be random bit errors or burst errors. Therefore, if high reliability is required, the use of an error correcting technique that …
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Automated Testbench Generation for Communication Systems
… through the noisy channel model that introduces errors into the data stream and, finally, passed through the GSM decoder models which attempt to correct the channel errors. Sophisticated error detection and error correction algorithms are used in the encoder/decoder models to increase the …
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Cater: An Opportunistic Medium Access Control Protocol for Wireless Local Area Networks
… when stations experience a good channel with few bit errors. Moreover, CATER does not adversely affect the predominate transport layer protocol (i.e., TCP), and provides equitable service to all stations within the network.
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A real-time, reconfigurable system for energy, error-resilient, and scalable lossless ECG coding
… is designed to be able to encode any sized bit width by utilizing a combination of 4, 6, or 8- bit entropy coders. Two separate encoding systems are investigated using the before-mentioned encoding algorithm. The first system recomputes the Reversible Variable Length Code (RVLC) tables …
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Analysis of Atmospheric Effects Due to Atmospheric Oxygen on a Wideband Digital Signal in the 60 Ghz Band
… distortion. The signal distortion leads to more bit errors and results in the presence of inter-symbol interference (ISI) in the received signal. This thesis aims to analyze the effects of atmospheric oxygen on a wideband digital link, especially at lower pressures and higher data rates. In order …
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