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Showing 1 to 20 of 54 for “"GROUP DELAY"”.
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Estimating partial group delay
Partial group delay is a spectral parameter, which measures the time lag between two time series in a system after the spurious effects of the other series in the system have been eliminated. For weakly-stationary processes, estimators for partial group delay are proposed based on indirect and …
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Negative-group-delay and Non-foster Electromagnetic Structures
… electromagnetic applications using negative-group-delay (NGD) and non-Foster structures and establishes an intimate connection between these two phenomena. As a result, novel implementations of non-Foster reactive elements using NGD networks are proposed. To this end, NGD and non-Foster …
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Tunable Optical Group Delay in Active Semiconductor Optoelectronic Devices
Nonlinear optical effects on the delay provided by active filters are then discussed. The nonlinear transmittance spectra of a Fabry-Perot amplifier are measured, and the results are accurately predicted using a self-consistent model. The model is then used to predict the corresponding delay …
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Estimation of partial group delay with applications to small samples
Partial group delay has an interpretation as a parameter that measures the time-lag relationship between two channels of a multiple time series after adjustments have been made for the influence of the remaining channels. The time-lagged relationship is typically studied frequency by frequency. In …
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UMVU estimation of phase and group delay with small samples
Group delay between two univariate time series is a measure, in units of time, of how one series leads or lags the other at specific frequencies. The only published method of estimating group delay is Hannan and Thomson (1973); however, their method is highly asymptotic and does not allow inference …
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The Synthesis of Symmetrical and Antimetrical Networks With Constant Group Delay
Made available in DSpace on 2014-12-08T22:23:19Z (GMT). No. of bitstreams: 1 6403840.pdf: 2129513 bytes, checksum: 190e9888d0f80833966af137cf80656c (MD5) Previous issue date: 1963
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Dielectric characterization of materials and lossy filter design using reflected group delay
… properties of materials using the reflected group delay of lossy resonators. Methods of dielectric characterization proposed in the thesis can be categorized as methods using an overcoupled coaxial resonator for testing the materials filled inside it and methods using a capacitively coupled …
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Reflected Group Delay method with Space Mapping Techniques for Coupled-Resonator Filter Design
… filter is proposed by implementing the reflected group delay design approach with space mapping techniques. The theory of the reflected group delay method is discussed in detail. An improvement to the traditional reflected group delay method is proposed in which reflected group delay values at …
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Implementation of Novel Group Delay Decomposition Method and Surgical Protocol for Assessing Peripheral Neuropathy
… optimized to implement the theoretical model of group delay. Using the decomposition model introduced by Szlavik <em>et al.</em>, the signal obtained from the entire nerve is broken down into individual action potentials associated with individual neurons.</p>
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Nerve Fiber Diameter Measurements Using Hematoxylin and Eosin Staining and Brightfield Microscopy to Assess the Novel Method of Characterizing Peripheral Nerve Fiber Distributions by Group Delay
… peripheral nerve fiber size distributions using group delay.</p>
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Time domain chromatic dispersion measurements in single mode optical fibers
… and the field. This technique uses a relative group delay of a band of light at slightly different wavelengths from a single pulsed laser diode to determine chromatic dispersion and the zero chromatic dispersion (ZCD) wavelength of the fiber. Time domain dispersion measurements find the group …
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Optimal estimation of ionosphere-induced group delays of global positioning satellite signals during launch, orbit and re-entry
… earth's surface. Among these is the ionospheric group delay. In the past, a single-state, dual-frequency filter has been used to estimate the ionospheric delay for authorized users. Although sufficient for terrestrial receivers for which the ionospheric delay changes very slowly, such a filter is …
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Investigation of a Simulated Annealing Cooling Schedule Used to Optimize the Estimation of the Fiber Diameter Distribution in a Peripheral Nerve Trunk
… be estimated by a simulation technique known as group delay. These results could be further improved using a combinatorial optimization algorithm called simulated annealing. This paper explores the structure and behavior of simulated annealing for the application of optimizing the group delay …
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CPM Equalization to Compensate for ISI due to Band Limiting Channels
… our second approach, we focus on eliminating the group-delay variations inside the channel passband using an FIR pre-filter. We assume the channel to be time-invariant and provide a method to design an FIR filter so that -when convolved with the band limiting filter - it results in more constant …
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Transimpedance Amplifier (TIA) Design for 400 Gb/s Optical Fiber Communications
… is a fairly new research area in Dr. Ha's group. In the first project sponsored by ETRI (Electronics and Telecommunication Research Institute) we started to design the building blocks of receiver for next generation 400 Gb/s optical fiber communication. In this thesis research a transceiver …
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Markov-Airy method for electromagnetic fields in layered structures and microsphere-stabilized planar resonators
… exact formulas are presented for calculating the group delay, group delay dispersion, and third-order dispersion upon reflection or transmission. For the first time, exact formulas are derived for calculating the dispersion of a planar waveguide up to third order. The algorithm has been …
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Optimal digital filter design for dispersed signal equalization
… ionosphere results in a frequency dependent time-delay of the signal frequency components. This effect of the medium on the signal is termed dispersion, and it increases the difficulty of pulse detection. A system capable of compensating for the dispersion would be desirable, as pulsed signals …
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Phase Shift Control: Application and Performance Limitations With Respect to Thermoacoustic Instabilities
… instabilities and shows that high average group delay through the frequency region of the instability is the root of the problem. This average group delay is then shown to be due not only the controller itself but can also be associated with other components and inherent characteristics of …
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Optinių dangų fazinių charakteristikų matavimas rezonansų skenavimo interferometru /
… interference modulation and narrower peaks. The group delay calculated from the captured spectres has extremely bad signal to noise ratio.
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Common cyclicities in seismicity and water level fluctuations at the Charlevoix seismic zone of the St. Lawrence River
… for temporal (time lag) relationships using Group Delay analysis, a procedure that tests for time relationships at selected bandwidths. The maximum value of the Group Delay function occurs at the 14 year period with a time lag of + 2.3 years, indicating that the water levels lead the …
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