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 50 for “"error performance"”.
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Adaptive Encryption Techniques In Wireless Communication Channels With Tradeoffs Between Communication Reliability And Security
… signal will be received with some amount of error. Consequently, due to the strict avalanche criterion (sac), this error propagates during the decryption process, resulting in half the bits (on average) after decryption to be in error. In order to alleviate this amount of error, smart coding …
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Transceiver Design with Iterative Decoding of Capacity-Approaching codes over Fading channels
… to outperform the conventional metric in both error performance and convergence speed. Our work demonstrates the importance of incorporating the knowledge of channel estimation accuracy into iterative decoding processes. We also propose a joint maximum-likelihood detector based on soft-output …
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On performance analysis of optimal diversity combining with imperfect channel estimation
… at the receiver. The non-observable estimation error contributes as an additive source of noise which is not white. Therefore, the optimal combining weight is derived taking into consideration the imperfect channel knowledge. The bit error rate for BPSK modulation over correlated Rayleigh and …
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A new generic maximum-likelihood metric expression for space-time block codes with applications to decoding
… algorithm. However, OSTBCs are limited in their error performance. This has led to the development of more general linear space-time block codes, such as quasi-orthogonal space-time block codes (QOSTBCs). QOSTBCs offer better error performance, but their decoding complexity is a concern since it …
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Coding performance on satellite channels using AX.25 protocol
… insure that data is received correctly, certain error control strategies are employed. In packetized transmission, automatic-repeat-request (ARQ) schemes and error correcting codes have been employed. Currently a combination of both is not employed by the AX.25 protocol. The purpose of this …
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Robust adaptive control and filtering
… boundedness), the closed-loop system tracking error performance in the presence (robust performance), and absence (nominal performance) of unmodelled dynamics, disturbances, and parameter time variations.
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Concatenation of Space-Time Block Codes with ConvolutionalCodes
… communication system with similar complexity and performance as maximal ratio receive combining. In this thesis we study the performance of space-time block codes in Rayleigh fading channel. In particular, the quasi-static assumption on the fading channel is removed to study how the space-time …
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Performance evaluation of a spread spectrum local area position location system
… frequency hopping and direct sequence. The error performance capabilities of spread spectrum position location systems were studied systematically through theoretical analysis, a series of experimental tests, and by the development of a computer simulation package. A small scale experimental …
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Practical techniques for rapid and reliable real-time adaptive filtering
… have superior convergence rate and Mean-Squared Error performance over the Data-Reusing LMS algorithm at the same computational cost. A geometric framework which aids in the presentation of the new class of algorithms is developed. This framework also allows a more complete understanding of three …
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Perfect Reconstruction Filter Banks for Adaptive Filtering and Coding
… and used to express the minimum mean square error (MMSE) of the Generalized Transform Domain Adaptive Filters, in terms of the filter bank chosen. Using this parametrization, it is shown how to analytically design filter banks to give optimum error and convergence performances given prior …
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From data to decision : boosting for time-constrained detection of objects in moving video
… are made, offering improvements in terms of the error rate performance and evaluation speed of various classifiers. - In Chapter 4 we consider the question of 'what makes a good dataset?' and develop a large pedestrian dataset for supervised learning (the NICTA Pedestrian Dataset). - In Chapter 5 …
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From data to decision : boosting for time-constrained detection of objects in moving video
… are made, offering improvements in terms of the error rate performance and evaluation speed of various classifiers. - In Chapter 4 we consider the question of 'what makes a good dataset?' and develop a large pedestrian dataset for supervised learning (the NICTA Pedestrian Dataset). - In Chapter 5 …
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Implementation of a Turbo Decoder on a Configurable Computing Platform
… new class of codes that can achieve exceptional error performance and energy efficiency at low signal-to-noise ratios. Decoding turbo codes is a complicated procedure that often requires custom hardware if it is to be performed at acceptable speeds. Configurable computing machines are able to …
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PERFORMANCE OF THE TWO SAMPLE LIKELIHOOD RATIO TEST UNDER A NESTED DIRICHLET: A SIMULATION STUDY
… a simulation study to evaluate the Type I error performance of the LRT under varying sample sizes, mean vectors, and precision parameters, providing insight into its robustness and applicability.</p>
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Architectures for Symbol Timing Synchronization in MIMO Communications
… discrete-time phase-locked loop are summarized. Performance examples over a MIMO channel based on measured data and on a simple stochastic MIMO channel model are given. These examples show that the mean-squared error performance of these techniques is not strongly dependent on the MIMO channel …
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A study of the minimum shift keying modulation scheme
… the effects of incorrect modulation index on the error performance of MSK, an investigation into this avenue was performed. The design of a correction mechanism for maintaining the modulation index at its correct value is described, and aspects of its implementation are considered. Using the …
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Wavelength division multiplexing technology and systems
… and dispersion are evaluated. A comparative error performance analysis of one and two F-P filter receivers in a BFSK transmission system is performed. An overview of numerous multiwavelength network and switch proposals along with their associated merits and demerits is given.
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LOCSET phase locking : operation, diagnostics, and applications
… beams operating with unprecedented LOCSET phase error performance of λ/71 RMS in a local loop beam combination configuration. The LOCSET phase locking technique was also successfully extended, for the first time, into an Object In the Loop (OIL) configuration by utilizing light scattered off of a …
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Iterative detection for overloaded OFDMA with spatial diversity
… single user decoding turbo loop. We verify the performance of each algorithm through Monte Carlo simulation with randomly generated multipath MIMO channels. From the results we determine the tradeoffs of algorithm complexity with performance and the effect of channel correlation on the …
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Performance bounds on matched-field methods for source localization and estimation of ocean environmental parameters
… waveguide propagation. Typical estimation performance demonstrates two fundamental limitations. First, sidelobe ambiguities dominate the estimation at low signal-to-noise ratio (SNR), leading to a threshold performance behavior. Second, most matched-field algorithms show a strong …
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