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 41 for “"band-limited"”.
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Sampling in band-limited and shift-invariant spaces
… More precisely, we first discuss the concepts of band-limited spaces and shift-invariant spaces as well as certain frames constructed in such spaces. The various reconstruction algorithms are then given and analyzed, especially the algorithms used in band-limited and shift-invariant spaces. The …
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Discrete-time band-limited extrapolation algorithms for radar imaging systems
This thesis is a study of band-limited extrapolation algorithms. In the one-dimensional case, we examine the Weighted-Norm, Iterative Weighted-Norm, Control-Point, Data Segmentation, and Cascade Form algorithms. Each modifies the reconstruction subspace used in the extrapolation. The basic …
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An investigation of nonuniform sampling of band-limited periodic signals.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1965. B.S.
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Error relilient video communications using high level M-QAM. Modelling and simulation of a comparative analysis of a dual-priority M-QAM transmission system for H.264/AVC video applications over band-limited and error-phone channels.
An experimental investigation of an M level (M = 16, 64 and 256) Quadrature Amplitude Modulation (QAM) transmission system suitable for video transmission is presented. The communication system is based on layered video coding and unequal error protection to make the video bitstream robust to …
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Reconstruction from non-uniform samples
Exact reconstruction of a band-limited signal from its non-uniform samples involves the use of Lagrange interpolation, which is impractical to implement as it is computationally difficult. This thesis develops approximate reconstruction methods based on time-warping to obtain reconstruction of …
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Higher dimensional fractal uncertainty
… multiplier theorem, which allows us to construct band-limited functions that decay rapidly on line porous sets. To prove this theorem, we first explicitly construct certain plurisubharmonic functions on Cᵈ. Then, following Bourgain, we use Hörmander’s L² theory for the ¯∂ equation to construct …
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Zero Crossing Based Spectral Analysis
… of the timed zeros, both real and complex, of a band-limited signal. Mathematics essential to the study is explained and the method of using a simple invertible transform to convert complex zeros to real zeros, otherwise known as zero crossings, is considered. The work of key researchers in the …
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CPM Equalization to Compensate for ISI due to Band Limiting Channels
… one of the most attractive modulation schemes in band limited channels. However, as the data rates keep increasing, the spectral width of the CPM signal increases beyond the channel bandwidth and performance becomes constrained by the intersymbol interference (ISI) that results from band-limiting …
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On low-pass reconstruction and stochastic modeling of PWM signals
… of pulse width modulation (PWM) is given. For a band-limited, finite energy input signal, a PWM generation mechanism is investigated in linear and non-linear blocks separately. Following the common practice, a comparator block with a periodic reference signal is offered as a PWM generator and …
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Learning Seismic Waves for Imaging the Earth
… to extrapolate missing low-frequency waves from band-limited seismograms. Low-frequency waves are essential to mitigate the cycle-skipping problem of full-waveform inversion (FWI), but data below ∼ 3 Hz are missing due to the band-limited characteristic of conventional artificial sources. Here we …
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A power electronic approach to improved dual-frequency vibration energy harvesting
… computations - allows for synthesis of a band-limited negative capacitor needed to improve dual-frequency energy harvesting.
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Performance evaluation of nonlinear satellite link by computer simulation
… link conditions such as linearity, nonlinearity, band-limited and noisy channels which are expected to be encountered in practical situations.
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The nonlinear differential semblance algorithm for plane waves in layered media
… minimizer from a crude initial guess for typical band-limited data.
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Synthetic Aperture Radar Image Formation for the Moving -Target and Near -Field Bistatic Cases
… in the reconstructed image. We then derive the band-limited property for BP methods in both monostatic and bistatic SAR imaging, which is the basis for developing the fast BP algorithm. We compare our algorithm with other frequency-domain based algorithms, and show that it achieves better …
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Analytic chance constraints for the robust guidance of autonomous parafoils
… sampling technique into the optimized Band- Limited Guidance (BLG) framework. Through the design of a novel risk-based objective function, CC-BLG trajectories efficiently balance the parafoil performance metrics of landing accuracy and landing speed with the risk of off-nominal terrain …
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Weak interference direction of arrival estimation in the GPS frequency band
… (DOA) of weak interferences in the GPS frequency band using antenna arrays. The main issues which affect weak GPS interference DOA estimation accuracy are the antenna array errors, interference from other GPS signals, the number of snapshots required for DOA estimation and system coloured noise. …
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Blind Channel Estimation and Multiuser Detection for Multi-Rate CDMA Communications
… a finite-length truncation approximation on the band-limited chip waveform, blind timing acquisition and channel estimation scheme is proposed for multi-rate systems. The channel estimation error due to the finite-length chip waveform truncation is analyzed by exploiting a first-order …
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Turbo coding and equalization for wireless communication systems
… a minimum phase overall impulse response. The band limited channel suffers performance degradation due to impulsive noise generated by electrical appliances. This thesis analysed a set of filter design criteria based on minimizing the bit error probability of impulse noise using digital smear …
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Time Domain Integral Equation-Based Methods for Analyzing Electromagnetic Scattering From Objects Residing in Lossy Media
… to speed up the evaluation of fields radiated by band-limited and time-limited sources far enough away. When these two techniques are hybridized in the MOT scheme, i.e., the recursive convolution scheme evaluates the near-field interaction, and the multilevel PWTD algorithm evaluates the far-field …
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Active control of broadband acoustic radiation from structures
… structures excited by a disturbance with broadband frequency content. An adaptive, multi-input multi-output (MIMO), feedforward broadband acoustic control system has been developed. The control approach is the least mean squares (LMS) algorithm. The compensators are adaptive finite impulse …
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