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 27 for “"signal distortion"”.
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Privacy protection through limited load signal distortion
… private information from an observed power signal is proposed, using some knowledge of the loads being hidden to offset identifiable load signatures in the signal for maximum ambiguity.
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A class-D-tracking-rail class-A audio power amplifier
… deliver up to 100W into an 8Q load with very low signal distortion and high power efficiency. The design uses a class-A amplifier, known for its low signal distortion but low power efficiency (less than 50%), to amplify the audio signal. Class-D amplifiers, known for their high power efficiency …
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Rate-Adaptive Runlength Limited Encoding for High-Speed Infrared Communication
… with acceptable error rate over a wide range of signal distortion/attenuation, and background noise. RA-RLL has performance superior to other infrared modulation schemes in terms of bandwidth efficiency, duty cycle control, and synchronization frequency. Rate adaptive techniques allow for quick …
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On-Chip Voltage Controlled Oscillator for Clock Data Recovery Systems
… transmission line loss, cross talk, and signal distortion resulting in intersymbol interference. Synchronous sampling is often employed to overcome these challenges. However, synchronous sampling makes use of a high purity oscillator to minimize the clock jitter. This thesis focuses on …
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Pre-compensation of nonlinear distortion of a silicon microring modulator in short reach systems
… investigates pre-compensation of this nonlinear distortion by back-calculation. An MRM model is firstly set up using Matlab. Through back-calculation of the model, an electrical drive signal is calculated based on a desired modulator output optical intensity. The back-calculated drive signal has …
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Analysis of Atmospheric Effects Due to Atmospheric Oxygen on a Wideband Digital Signal in the 60 Ghz Band
… a license is not required for a wideband digital signal in this band. Previous research on 60 GHz signals focused on how much attenuation due to atmospheric oxygen exists in the link. But a look at the physical properties of atmospheric oxygen reveals both the reason why atmospheric oxygen absorbs …
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A 4th order continuous-time [Delta] [Epsilon] ADC with VCO-based integrator and quantizer
… of the oscillator's output phase to avoid the signal distortion that had severely limited the performance of earlier VCO-based ADC's, which exclusively made use of the output frequency. Furthermore, the proposed architecture includes a scheme for performing fast dynamic element matching (DEM), …
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Coherent multi-photon interference and compensation of polarization dispersion
… mode dispersion an important source of signal distortion in high-bitrate communications arising from unwanted birefringence in the fiber. We will describe theoretical analysis of compensated PMD systems, as well as our theoretical and experimental effeots to develop novel PMD …
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Essays on auctions, contests, and games
… Manuelli and Ludwig Straub, proposes a model of "signal distortion" in a game with imperfect public monitoring. We construct a framework in which each player has the chance to distort the true public signal, and each player is uncertain about the distortion technologies available to his opponent. …
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A FPGA/DSP based ultrasound system for tumor detection
… (QUS) which means sending an ultrasound signal from a transmitter and receiving it at multiple receivers. This received signal is analyzed for echogenic as well as echolucent tumors to differentiate between the two along with non-tumorous sample and also for delay, signal distortion to …
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Interconnect capacitance extraction under geometric uncertainties
… interconnect-induced delay, crosstalk, and other signal distortion related effects that are used to guide IC routing and floor planning. The continuous progress of semiconductor technology is leading ICs to the era of 45 nm technology and beyond. However, this progress has been associated with …
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Analysis of antenna beamforming architectures for wireless communications
… performance metrics such as spectral efficiency, Signal-to-Interference-plus-Noise Ratio (SINR) evolution, and beam steering accuracy are evaluated. Additionally, signal distortion is analyzed through Error Vector Magnitude (EVM) sweeps, and hardware viability is quantified by computing the …
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Low Nonlinearity Optical Fibers for Broadband and Long-Distance Communications
… mode-field-diameters. In other words, less signal distortion due to fiber nonlinearity (larger effective-area) is associated with higher power loss due to bending of fiber (larger mode-field-diameter). Thus, a large effective-area and low bending loss are conflicting requirements. A …
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Vector modulators for analog-beamforming receivers
… to phase-shift and scale the amplitudes of the signals from each antenna before signal combining. These VMs require accurate phase and gain control and high DR to achieve accurate beamforming and avoid corruption of the desired signal by blockers. At the same time, degrading transistor …
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Experimental Evaluation of Underwater Semantic SLAM
… water absorbs and scatters most electromagnetic signals used in terrestrial communications. This necessitates the use of acoustic communication, which has a lower bandwidth and is prone to delays and signal distortion. Similarly, GPS signals do not penetrate water, complicating navigation and …
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Energy efficient radio frequency system design for mobile WiMax applications. Modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations.
… efficiency in order to avoid the introduction of signal distortion, whilst making best use of the available power resources for amplification. However, the present work goes beyond this by investigating a new line of amplifiers that address the green initiatives, namely green power amplifiers. …
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Graph-based decoders and divergence-rate estimators for data-hiding problems
… watermark decoding in the presence of various signal distortion operations. Employing Forney-style factor graphs to model the watermarking system, we cast the blind watermark decoding problem as a probabilistic inference problem on a graph, and solve it via messagepassing. We study a wide range …
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RF- Front-End Non-Linear coupling cancellation = Cancelación de acoplo no lineal en frontales de RF
… energy transfers between physical mediums. This signal distortion, also known as multiantenna radio-frequency (RF) front-end coupling is analyzed throughout the thesis, and as a result three coupling cancellation procedures are developped and later tested in simulated coupling environments. The …
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Generalized DFT: extensions in communications
… applications where frequency selectivity and signal correlation features of the optimal subspace are compromised. In the first part of the dissertation, a method is addressed to design optimal waveforms which meets above requirements for various radar systems by designing the phase shaping …
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On-chip magnetic sensor and readout design for 3D position tracking in image-guided interventions
… (LDO), along with a low-voltage differential signaling (LVDS) driver for minimal signal distortion and an on-chip clock source. These integrated components reduce the pin count and contribute to the compactness of the on-chip sensor. This on-chip magnetic sensor is employed for 5-DoF magnetic …
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