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.
Results
Showing 1 to 20 of 31 for “"adaptive filters"”.
-
Orthogonalization techniques for adaptive filters
… and the computational complexity of an adaptive algorithm are two essential criteria by which the performance of an adaptive filter is measured. These objectives conflict with one another; each property is successfully achieved at the expense of the other. The principal means of …
-
Adaptive filters for sparse system identification
… has attracted much attention in the field of adaptive algorithms, and the adaptive filters for sparse system identification are studied. Firstly, a new family of proportionate normalized least mean square (PNLMS) adaptive algorithms that improve the performance of identifying block-sparse …
-
Fast Algorithms for Volterra-Series-Based Nonlinear Adaptive Filters
Two efficient algorithms for the second-order adaptive Volterra filter are developed in Chapter 2. By utilizing the special structure of the input correlation matrix of the Volterra filter the two algorithms essentially implement quasi-Newton algorithm with $O\lbrack {\rm N}\sp2\rbrack$ …
-
Time dependent adaptive filters for interference cancellation in CDMA systems
… presents several forms of the Time Dependent Adaptive Filter (TDAF) which are able to fully exploit the cyclostationarity and high degree of spectral correlation in certain DS-SS signals. It is shown that these optimal TDAFs are able to combat interference from noise, multipath, signals with …
-
System Identification of a Cantilever Beam with Interferometer Measurement Using Adaptive Filters
… then validated numerically and experimentally. Adaptive filters based on FIR and IIR are designed to identify the transfer function. Because of the slow convergence of such filters, a recursive LMS algorithm is designed to accelerate computation. It is experimentally demonstrated that the …
-
Motion artifact reduction for wearable photoplethysmogram sensors using micro accelerometers and laguerre series adaptive filters
… measured signal useless. This thesis develops an adaptive motion artifact reduction scheme to recover the underlying physiologic information from the corrupted signal using a collocated accelerometer as a motion reference and adaptively estimating the motion-to-artifact system dynamics. It has …
-
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 …
-
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 …
-
Recursive backpropagation algorithm applied to a globally recurrent neural network
… in the same way infinite impulse response (IIR) filters can replace longer finite impulse response (FIR) filters. This thesis presents a new adaptive algorithm that trains recursive neural networks. This algorithm is based on least mean square (LMS) algorithms designed for other adaptive …
-
Stochastic adaptive system theory for identification, filtering, prediction and control
… asymptotic properties of various stochastic adaptive systems for identification, filtering, prediction and control. These include the convergence of long-term averages of signals of interest (self-optimality), the convergence of adaptive filters or controllers (self-tuning property), the …
-
Stereophonic Acoustic Echo Cancellation: Theory and Implementation
… data. Paper II presents a comparison between adaptive filters for usage in stereophonic acoustic echo cancellation. The comparison includes, in addition to the standard normalized least mean square algorithm, the two-channel fast recursive least-squares algorithm and a two-channel …
-
Perfect Reconstruction Filter Banks for Adaptive Filtering and Coding
… perfect reconstruction filter banks (PRFBs) for adaptive filtering and coding applications. The first half of this thesis derives a generalization to the Transform Domain Adaptive Filter (TDAF), which uses filter banks instead of unitary transforms to preprocess input signals. The parametrization …
-
Adaptive Extended Kalman Filtering Strategies for Autonomous Relative Navigation of Formation Flying Spacecraft
… this thesis presents the development of two adaptive extended Kalman filter navigation algorithms for spacecraft formation flying. The proposed adaptive filters are capable of updating the internal noise characteristics of the Kalman filter in real time, and are viable in all orbit scenarios, …
-
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 …
-
Signal processing in a loudspeaking telephone
… handset over most of the B.T. network. Digital adaptive-filters are used in the duplex LST to cancel coupling between the loudspeaker and microphone, and across the transmit to receive paths of the 2-to-4-wire converter. Normal movement of a person in the acoustic path causes a loss of stability …
-
Array Signal Processing Algorithms for Beamforming and Direction Finding
… sonar, and wireless communications. Numerous adaptive array processing algorithms have been reported in the literature in the last several decades. These algorithms, in a general view, exhibit a trade-off between performance and required computational complexity. In this thesis, we focus on …
-
DCD Algorithm: Architectures, FPGA Implementations and Applications
… such as antenna array beamforming, adaptive filtering, multi-user and multiple-input multiple-output (MIMO) detection, channel estimation and equalization, echo and interference cancellation and others, solving linear systems of equations often provides an optimal performance. …
-
Algorithms and inference for simultaneous-event multivariate point-process, with applications to neural data
… we derive generalizations of point-process adaptive filters. The MPP time-rescaling theorem can be used to assess model goodness-of-fit. We illustrate the features of our SEMPP model by simulating SEMPP data and by analyzing neural spiking activity from pairs of simultaneously-recorded rat …
-
Development Towards the use of Beamforming and Adaptive Line Enhancers for Audio Detection of Quadcopters
… then divided into sub-bands using three bandpass filters centered on the expected location of the fundamental BPF and its 2nd and 3rd harmonics. For each sub-band, an adaptive filter called an adaptive line enhancer is used to extract and enhance the narrowband signals. The response of the …
Page 1 of 2