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 144 for “"Nyquist"”.
-
High-Resolution Nyquist -Rate Analog -to -Digital Converter
This thesis presents a pipelined analog-to-digital converter (ADC) employing a capacitor error-averaging technique with look-ahead decision and digital error correction concepts that has been implemented in a CMOS technology to achieve high linearity and high speed. The capacitor error-averaging …
-
A super-nyquist architecture for rateless underwater acoustic communication
… conditions. This is done by using a super-Nyquist (SNQ) transmission scheme. Several other important technologies are also part of the design, among them dithered repetition coding, adaptive decision feedback equalization (DFE), and multiple-input multiple-output (MIMO) communication. We …
-
Blind Synchronization and Detection of Nyquist Pulse Shaped QAM Signals
This thesis proposes a blind receiver for the Nyquist pulse shaped quadratureamplitude modulation (QAM) signals. The focus is on single carrier signals. The blind receiver includes the estimation of the symbol rate, the roll-off factor of the filter, the optimal sample phase, the frequency offset, …
-
Multilevel Nyquist-WDM Ultra-Long-Haul Coherent Optical Transmission Systems
… in ultra-long-haul links. More in details, Nyquist filtered multilevel optical modulation formats (QPSK, 8QAM and 16QAM) have been investigated as candidates for the efficient transmission of information (toward the Shannon limit). Wavelength division multiplexed (WDM) systems assembled with …
-
Reduced Receivers for Faster-than-Nyquist Signaling and General Linear Channels
… the data transmission rate with the faster-than-Nyquist (FTN) framework while keeping a fixed power spectral density (PSD). In FTN consecutive information carrying symbols can overlap in time and in that way introduce a controlled amount of intentional intersymbol interference (ISI). This …
-
A comparison of the Inverse Nyquist Array and Pole Assignment techniques
This dissertation compares the Inverse Nyquist Array (INA) and the Pole Assignment techniques in multivariable control system design. The representation of multivariable systems in both the frequency domain and state space is discussed. A laboratory flotation system, for which a model by step …
-
Spatial Nyquist fidelity method for structural models of opto-mechanical systems
… a quantitative measure of fidelity, termed the Nyquist fidelity metric, is defined for commonly used structural model components. It expresses the ability of a finite element model to accurately predict structural eigenvalues based on the mesh size required by the spatial Nyquist criterion. The …
-
A study of rough amplitude quantization by means of nyquist sampling theory
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1956.
-
Sub -Nyquist Multicoset and MIMO Sampling: Perfect Reconstruction, Performance Analysis, and Necessary Density Conditions
We then study the MIMO sampling problem, where a set of multiband input signals is passed through a MIMO channel and the outputs are sampled nonuniformly. MIMO sampling is motivated from applications like multiuser communications and multiple source separation. MIMO sampling encompasses several …
-
Low-Complexity Iterative Receiver Design for Multi-Carrier Faster-Than-Nyquist Signaling Over Frequency-Selective Fading Channel
… communication systems. Multi-carrier faster-than-Nyquist (MFTN) signaling reduces the symbol period satisfying the Nyquist criterion in the time domain and the minimum spacing of orthogonal subcarriers in the frequency domain for remarkably improving the spectral efficiency, which still occupies …
-
Low Latency Compressive Sensing using Multi-Resolution Analysis In Radar Signal Processing
… speeds and a wider signal bandwidth. The Shannon/Nyquist sampling theorem states, the ADC must sample the signal at a rate two times faster than the signal bandwidth in order to avoid data loss. However, the advances of ADC cannot always meet these demands. Considerable research has been done to …
-
Code-division multiplexing
… resulting output samples satisfy the Generalized Nyquist criterion. Specifically, we propose finite-length, time overlapping orthogonal pulse shapes that are g-Nyquist. They are derived from extended and modulated lapped transforms by proving the equivalence between Perfect Reconstruction and …
-
Finite-Difference Methods for the Wave Equation with Reduced Dispersion Errors
… for any normalized wavenumbers up to the Nyquist. We will also look at the system matrix and prove that we can get higher order approximation to the dispersion at arbitrary normalized wavenumbers up to the Nyquist.
-
Design and simulation of a torque sensing governor for an internal combustion engine
… for the real system using each governor and the Nyquist stability criteria applied. The Nyquist criteria showed the system to be stable when either governor was used. The Nyquist plots showed that the torque sensor reduced phase lag more than the derivative component of conventional control.
-
SPECTRALLY EFFICIENT MULTICARRIER SYSTEMS FOR FIBER-OPTIC TRANSMISSION
… frequency-division multiplexing (OFDM) and Nyquist wavelength-division multiplexing (Nyquist-WDM) are the two basic approaches to achieve the 1 Baud/s/Hz spectral efficiency. OFDM allows spectral overlap of adjacent subcarriers and crosstalk elimination by integration at the receiver; …
-
Compressive Measurement of Spread Spectrum Signals
… to intercept using conventional methods based on Nyquist sampling. Recently, a novel concept called compressive sensing has emerged. Compressive sensing theory suggests that a signal can be reconstructed from much fewer measurements than suggested by the Shannon Nyquist theorem, provided that the …
-
Investigating the A-type stars using Kepler data
… 7500 K. Another property investigated is the Nyquist frequency. We found that periodically modulated sampling on board Kepler allows distinction between real pulsation frequencies and Nyquist aliases, even when those real frequencies exceed the Nyquist frequency of the data. This discovery …
-
Compressive Detection and Estimation with Applications to Cognitive Radio and Radar
According to Nyquist Sampling theorem, a band-limited signal can be reconstructed accurately if the sampling rate exceeds twice the maximum frequency of the signal. In many scenarios, this Nyquist sampling rate cannot be achieved due to hardware limitations. Compressive sensing (CS) is a technique …
-
Multidimensional random sampling for Fourier transform estimation
… imposes the sampling density of at least the Nyquist density. Otherwise, alias frequencies occur in the processed bandwidth which can lead to irresolvable processing problems. Random sampling can mitigate Nyquist limit that classical uniform-sampling-based approaches endure, for the purpose of …
-
Receiver equalization for a 10 gigabit per second high-speed serial link in 65 nm CMOS technology
… a BER < 10E−12 while consuming 3.3 mW at the Nyquist frequency of 5 GHz.
Page 1 of 8