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 259 for “"Narrowband"”.
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Asynchronous receivers in narrowband packet radio applications
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Novel narrowband microstrip filters for wireless communications systems
The novel resonant structures based on microstrip integrated circuit technology have been developed and extensively studied in this research project for filter applications in next generation wireless communication systems. Several novel microstrip bandpass filter structures have been introduced …
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An ultrabright, narrowband source of polarization-entangled photons
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Optimal rejection of nonstationary narrowband disturbances for flexible systems
… control actuators often act as sources of narrowband disturbances and impede the optimal performance of these precision systems. The fundamental objective of this work is the development of an active control methodology capable of rejecting disturbances with narrowband nonstationary …
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A Nonlinear Technique for Bandwidth Improvement in Narrowband Antennas
… of the thesis is presented using a model of a narrowband antenna. A literature review of various narrowband electrically small antennas is studied, including the pros and cons of the Inverted-F antenna (IFA), Inverted-L antenna (ILA), and the Planar Inverted-F antenna (PIFA).Next, the analysis …
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Design of Microwave Front-End Narrowband Filter and Limiter Components
… a technology that is suitable for low-loss, narrowband filters that can handle high power levels. This is accomplished by reducing a substrate-integrated waveguide (SIW) loaded evanescent-mode bandpass filter to a half-mode SIW (HMSIW) structure. Demonstrated third-order SIW and HMSIW filters …
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A hierarchical model for integration of narrowband cues in speech
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Narrowband passive systems theory with applications to positioning and navigation.
Thesis. 1975. Sc.D. cn--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Ultra-wideband Narrowband Interference Cancellation and Channel Modeling for Communications
… order to justify the application of traditional narrowband path loss models to UWB signals. Average delay statistics and their distributions are also presented for small scale channel modeling. The thesis also investigates narrowband interference cancellation. To protect legacy narrowband systems …
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Harmonic and Narrowband Disturbance Rejection for Linear Time-Periodic Plants
This research investigates the harmonic and narrowband disturbance rejection problem for linear time-periodic (LTP) systems. The consequence of disturbances on LTP systems is similar to their linear time-invariant (LTI) counterparts, but is complicated by the interaction of the disturbance and …
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Investigation of Narrowband Acousto-Optic Tunable Filters for Semiconductor Laser Tuning
Wavelength tunable sources find applications in areas of laser surgery, optical coherence tomography, material processing, and differential absorption light detection and ranging. Acousto-optic tunable filters (AOTFs) are wavelength selective devices which allow for better stability than mechanical …
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Comparison of Machine Learning-Based Methods for Narrowband Blind Adaptive Beamforming
There are many different approaches to beamforming and interferer cancellation. The earliest methods of beamforming assumed prior knowledge of the receive array geometry and of the incoming signal directions. This information is normally found via array calibration. Blind source separation methods …
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Non-Wiener Effects in Narrowband Interference Mitigation Using Adaptive Transversal Equalizers
… equalizer in the presence of additive narrowband interference. The steady-state LMS equalizer behavior does not correspond to that of the fixed Wiener equalizer: the mean of its weights is different from the Wiener weights, and its mean squared error (MSE) performance may be …
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Trellis-coded permutation modulation for improved performance of narrowband noncoherent FSK
… to improve the performance of noncoherent FSK in narrowband channels. It is shown that FSK permutation modulation has better spectral efficiency than conventional FSK modulation" but with the tradeoff on reduced energy efficiency. To overcome this problem, we apply trellis-coded modulation (TCM) , …
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Integrated narrowband guided mode resonance photonic filters for advanced mid-infrared microspectroscopy
… an MIR detector and a tunable single-peak narrowband light source, such as selective thermal emitters, quantum cascade (QC) lasers, or a combination of a broadband incandescent globar and filters. This thesis explores the DF-IR approach by using photonic filtering that is based on guided …
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Using narrowband pulse-shaping to characterize polymer structure and dynamics : Deathstar GHz spectroscopy
(cont.) The validation of this technique for probing amorphous polymer structure and dynamics lays the ground for further study of heterogeneous materials, such as nanocomposites and block copolymers.
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Narrowband Photodetection in the Short-wavelength Infrared with a Plasmon-induced Hot Electron Device
… yields a photodetector with a strongly resonant, narrowband photocurrent response in the infrared, limited at low frequencies by the Schottky barrier, not the bandgap of silicon. Here we report a grating-based hot electron device with significantly larger photocurrent responsivity than previously …
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From narrowband to broadband--asynchronous transfer mode and the transformation of the telephone netowrk
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Analysis, design, and prototyping of a narrowband radio for application in wireless sensor networks
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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A Study of Narrowband Noise Characteristics Associated with Vortex Motion in High Temperature Superconductors
Vortex motion plays an important role in the transport properties of high Tc superconductors. In the presence of a sufficiently large applied current vortices will drift creating an ohmic resistance in the material, while defects in the material will tend to inhibit their motion. Some types of …
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