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 10 of 10 for “"multi-tone"”.
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D-q impedance identification in three phase systems using multi-tone perturbation
… existence of system line harmonics. Furthermore, multi-tone approach is developed to improve simulation time. The complete software tool is tested with simulation models and experiment results, to show the effectiveness. When multi-tone approach is applied on nonlinear loads, it gives incorrect …
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The perceived urgency and detection time of multi-tone and frequency-modulated warning signals in broadband noise
… signals. These elements included pulse format (multitone sequential, multitone simultaneous, and rising sawtooth frequency-modulated pulse formats), pulse level (65 dBC and 79 dBC), and time between pulses (0 ms, 150 ms, and 300 ms). The environments of interest were those settings with …
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Perspectives of Jamming, Mitigation and Pattern Adaptation of OFDM Pilot Signals for the Evolution of Wireless Networks
… work we focus on OFDM reference signal or pilot tones, which are used for channel estimation, link adaptation and other crucial functions in Long-Term Evolution (LTE). We investigate two aspects of pilot signals pertaining to its evolution - (a) impact of targeted interference on pilots and its …
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Neural correlates of auditory perceptual organization measured with direct cortical recordings in humans
… acoustic environment remains unclear despite the multitude of recent studies utilizing microelectrode recordings in experimental animals or non-invasive human neuroimaging. In particular, the role that brain areas outside the auditory cortex might play is, comparatively, vastly understudied. The …
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Phase anomalies and plateaus in auditory nerve fiber responses to high-frequency tones
… have synchronized responses to high-frequency tones. We sought counterparts to the BM responses in auditory nerve fibers (ANF) by using a new method that extracts phase information from beat-producing multi-tone stimuli. The method can determine the relative phases of ANF responses to …
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Nonlinear Representation of Auditory Stimuli Across the Auditory Cortex
<p>The neural evoke activity to pure tones in primary auditory cortex has been systematically studied for many years, as has the spatial organization of these responses. Unlike pure tones, natural sounds possess complex spectro-temporal structures across frequencies. How simple tuning properties …
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Design of energy-efficient ultrasonic communication systems on steel pipes
… power is suggested, where frequency division multiplexing is explored to counter frequency selectivity. Finally, bits-per-Joule capacity of this channel, based on experimentally measured channel responses, are determined numerically, and an example of an optimized multi-tone frequency shift …
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Feedback Communication Systems for Time-Varying Channels
… transmitter energy to a channel estimation pilot-tone signal. Channel information thus derived by the receiver is fed back to the transmitter to control transmitter power and/or transmission rate. The resulting improvement in receiver error probabilities is calculated. It is shown that this system …
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Generalized discrete Fourier transform with non-linear phase : theory and design
… engineering applications, including discrete multi-tone (DMT), orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA) communications systems. Among these popular transforms, DFT is a linear phase transform and widely used in multicarrier communications due …
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Identification of small-signal dq impedances of power electronics converters via single-phase wide-bandwidth injection
… injection signals, among which are chirp, multi-tone, pulse and white noise, are compared and theoretically analyzed. Several hardware examples are included in the analysis. The second part of the dissertation will focus on the modeling of small-signal input dq admittance of multi-pulse …