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 67 for “"adaptive filter"”.
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On Ways to Improve Adaptive Filter Performance
Adaptive filtering techniques are used in a wide range of applications, including echo cancellation, adaptive equalization, adaptive noise cancellation, and adaptive beamforming. The performance of an adaptive filtering algorithm is evaluated based on its convergence rate, misadjustment, …
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Switching adaptive filter structures for improved performance
We describe an adaptive filter system that is able to switch between adaptive filter algorithms in order to produce fast convergence and low mean Square error (MSE). The switching system employs two adaptive filters for two different tasks; one is intended to yield fast convergence, and logically …
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NonGaussian estimation using a modified Gaussian sum adaptive filter
… the MGS and GS algorithms are examined. An MGS adaptive filter is derived for a general system and a modal system, with simulation examples performed using a non Gaussian input signal. The modal system simulation results are compared to those produced from an augmented Kalman filter based on an …
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Study of the transform domain model combination adaptive filter
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Phased-locked loop study, simulation, and design of adaptive filter
… loop operation of the pass band or the low-pass filter in the loop. From the findings, it was concluded that when the loop was out of lock, the pass band of the low-pass filter should be wide; however, when the loop was locked, the pass band of the low-pass filter should be narrow. The transient …
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Design of a power-scalable digital least-means-square adaptive filter
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Implementation of Adaptive Filter Algorithms for the Suppression of Thermoacoustic Instabilities
The main goal of this work was to develop adaptive filter algorithms and test their performance in active combustion control. Several algorithms were incorporated, which are divided into gradient descent algorithms and pattern searches. The algorithms were tested on three separate platforms. The …
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A nonlinear adaptive filter for improved operation and protection of power systems
… thesis presents the application of a nonlinear adaptive filter to selected areas in power systems. The filter has demonstrated excellent performance against con-ventional methods in biomedical applications. The algorithm is robust in structure and highly immune to noise. Applications in this …
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Design and Implementation of an FPGA-based Adaptive filter Single-User Receiver
… mobile environments. For single-user receivers, adaptive filtering techniques can be employed to alleviate multiple access interference and the near-far problem. In this thesis, an adaptive filter receiver is implemented on the FPGA-based configurable computing platform called GigaOps G900. By …
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Temperature prediction using thermal fluctuations from wireless sensor networks in adaptive filter model
… we propose a temperature prediction model using adaptive filter methodologies to learn the relationship between thermal fluctuations at distinct locations within a lab environment.
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State Variable and Parameter Estimation
… into state estimation theory and a continuous filter is developed. A new sequential adaptive filter is then developed which effectively compensates for errors in the mathematical description of the process. This adaptive filter finds the mean and covariance of ‘fictitious inputs' and uses these …
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Partial Update Adaptive Filtering
Adaptive filters play an important role in the fields related to digital signal processing and communication, such as system identification, noise cancellation, channel equalization, and beamforming. In practical applications, the computational complexity of an adaptive filter is an important …
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Adaptive techniques in signal processing and connectionist models
… a series of new methods and the application of adaptive filter theory which are combined to produce a generalised adaptive filter system which may be used to perform such tasks as pattern recognition. Firstly, the relevant background adaptive filter theory is discussed in Chapter 1 and methods …
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Applications of fuzzy counterpropagation neural networks to non-linear function approximation and background noise elimination
An adaptive filter which can operate in an unknown environment by performing a learning mechanism that is suitable for the speech enhancement process. This research develops a novel ANN model which incorporates the fuzzy set approach and which can perform a non-linear function approximation. The …
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Motion artifact reduction of electrocardiograms using multiple motion sensors
… the ECG signal itself. The effectiveness of the adaptive filtering method in reducing motion artifacts is investigated using multiple motion sensors on key locations of the body and by combining the motion data through the use of various blind source separation methods. An adaptive filter is a …
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Compensation of nonlinear distortion and frequency offset in OFDM systems
… of the ICI effects, we propose a nonlinear adaptive filter. In addition, we investigate the performance of the nonlinear adaptive filter when the ICI effects are magnified by some residual nonlinear distortion. Moreover, we present a blind estimation scheme of frequency offset based on the …
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Channel modeling and interference rejection for CDMA automatic vehicle monitoring systems
… wireless communication systems. Time Dependent Adaptive Filter (TDAF) Processing represents an effective approach for CDMA interference rejection. This technique is especially appropriate at the mobile receiver where there is little prior knowledge of the spreading codes of the other users. This …
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The influence of physical system parameters on the performance of adaptive filters for system identification of mechanical systems
Recursive and nonrecursive least mean square adaptive filters were used to predict the output of various mechanical systems for a given input. The effects of quality factor (Q), dispersion and transmission time on adaptive filter performance were investigated. Optimal filter delay times and tap …
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Exploration of alternative algorithms for multi-channel acoustic echo cancellation
… audio (stereophonic, etc). The use of the Kalman filter as an alternative adaptive filter methodology for this MCAEC application is explored in this work. The Normalized Least Mean Squares filter (NLMS) serves as a benchmark for the Kalman filter. Simulations using room recordings and measured …
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Aspects of stepped-frequency processing for low-frequency SAR systems
… to suppress RFI. Of these, the notch filter and the LMS adaptive filter have been implemented and applied on real P-band data obtained from the E-SAR system of the German Aerospace Center (DLR), Oberpfaffenhofen, and on real VHF-band data obtained from the South African SAR (SASAR) …
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