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 16 of 16 for “"test signal"”.
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Design of Power Amplifier Test Signals with a User-Defined Multisine
… involves wireless transmission and reception of signals at radio frequencies (RF). Base stations house equipment critical to the transmission and reception of signals. Power amplifier (PA) is a crucial element in base station assembly. PAs are expensive, take up space and dissipate heat. Of all …
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FPGA Implementation of a Pseudo-Random Aggregate Spectrum Generator for RF Hardware Test and Evaluation
Test and evaluation (TandE) is a critically important step before in-the-field deployment of radio-frequency (RF) hardware in order to assure that the hardware meets its design requirements and specifications. Typically, TandE is performed either in a lab setting utilizing a software simulation …
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AN FFT SPECTRAL ANALYSIS FOR SYSTEM IDENTIFICATION
… contained in the spectral density functions of a test signal applied to the system. This thesis reviews the basic relationships between a system transfer function am the spectral density functions of the system input signal am output signal. The method of obtaining the spectral density functions …
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Digital processing of system responses
… when subjected to a composite sinusoid signal has led to the derivation of a new test signal. This signal consists of an assemblage of discrete sinusoids of frequencies which are odd and prime number multiples of some fundamental which is itself excluded from the signal. The properties …
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Analogue self-interference cancellation in full-duplex radios
… is done by cancelling the self-interference (SI) signal before it enters the receiver chain. AASIC techniques are usually implemented together with passive and active digital self-interference cancellation (SIC) techniques. In this study, an analogue radio frequency (RF) SI canceller that cancels …
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Analogue self-interference cancellation in full-duplex radios
… is done by cancelling the self-interference (SI) signal before it enters the receiver chain. AASIC techniques are usually implemented together with passive and active digital self-interference cancellation (SIC) techniques. In this study, an analogue radio frequency (RF) SI canceller that cancels …
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Applications of almost periodic functions and equivalent nonlinearities to identification and control of nonlinear systems
… Volterra approach. This technique uses a 4-level test signal and is the subject of detailed analysis in later chapters. The 4-level test signal is discussed in detail in Chapter 2 and it is shown that the linear channel of a nonlinear system may be identified. The concept of the almost periodic …
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The Remote Measurement of Phase Angle
… time delay in transmission of the measurement signals from substation to Control Room. This error is avoided inthe measurement system described. A test signal, superimposed on the phase measurement signal, repetitively measures the transmission path delay, and applies a suitable correction to …
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An invariance transformation algorithm for defect characterization of ultrasonic signals for the nondestructive evaluation of concrete
… system off-line. However, interpretation of NDE signals in terms of the location, size, and shape of underlying flaws in the material being inspected is fraught with difficulty. Typically, variations in the testing signal due to operational parameters have created a significant challenge for …
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Objective Evaluation of Tracheoesophageal Speech Quality
… speech along with the output of the system under test. Non-intrusive measures on the other hand only require access to the output speech signal of the system. This thesis examines methods of objective speech quality prediction using both intrusive and non-intrusive techniques for the analysis of …
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Energy-detection based spectrum sensing for cognitive radio on a real-time SDR platform
… is developed on the Software-Defined Radio (SDR) testbed that is built with Universal Software Radio Peripheral (USRP) devices, and on the GNU Radio software platform. The noise floor of the system is first analysed to determine the detection threshold, which is obtained using the empirical …
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Full Custom VLSI Design of On-Line Stability Checkers
… a flip-flop, which detects unstable and late signals in the pipeline of a digital system. The On-line stability checker operates concurrently with its associated circuit-under-test (CUT). This thesis describes the full custom very-large-scale integration (VLSI) design and testing process of …
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Identification of linear and nonlinear systems using multisine signals with a gas turbine application
… procedure. This thesis deals with the design of test signals for both linear and nonlinear modelling and their application to an engineering problem. It is motivated by a desire to fully exploit the recent advances in computer technology, which make the design and application of complex multisine …
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Fast superresolution based on a network structure trained using sparse coding
… structure. Sparse representation of image signals forms the cornerstone of our approach and the goal is to obtain resolution enhancement of the low resolution images. I will discuss various dictionary learning methods and also a joint dictionary training approach. Superresolution is used to …
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Adaptive Interference Mitigation in GPS Receivers
… of technology and socioeconomic systems. As GNSS signals have inherent limitations, they are highly vulnerable to intentional and unintentional interference. GNSS signals have spectral power densities far below ambient thermal noise. Consequently, GNSS receivers must meet high standards of …
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Digital calibration of nonlinear memory errors in sigma-delta ADCs
… technique is devised to resolve the input signal dynamic range loss resulting from the PN circulation in modulator loops. Error model identification is accomplished by correlating various moments of the digital output with a one-bit PN by exploiting the independence between the input and …