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Research on Phase Determining in Frequency Domain for Multisine Signals

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Tutor: LinMaoLiu
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Multi-frequency sinusoidal signal,Phase analysis,Linear phase,Nonlinear distorti
CLC: TM935.2
Type: Master's thesis
Year:  2010
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Accompanied by the development of the measurement instrument, now we not only can be accurately measured broadband microwave signal amplitude spectrum, the same can be accurately measured obtaining the phase spectrum. Although the precise measurement of the amplitude spectrum of the wideband signal is not new, but the precise measurement of the corresponding phase spectrum is facing challenges. In actual measurement, the spectrum is obtained in a limited time window. For a periodic signal, independent of the magnitude of the spectrum information and the position of the time window, so the result of the measurement of the different moments can be compared directly. However, the phase information of the spectrum is associated with the position of the time window is different, which makes the phase spectrum of the same waveform at different times measured. Thus, the comparison is not measured under the window a plurality of phase spectrum is difficult, and the result of multiple measurements combined model is even more challenging. Accurate wideband vector signal analysis requires three necessary conditions: high dynamic range of measuring instruments, precise calibration methods and possible phase analysis method. First, the article describes the phase analysis method have been proposed, they are aligned with the phase spectrum can be used for multiple measurements valid comparisons and modeling. Then, several existing frequency domain alignment algorithm to do a detailed study and reference standard run time and memory space are analyzed and compared the performance of these several methods. This paper presents a new and improved frequency domain alignment algorithm on the basis of in-depth understanding of the frequency-domain alignment algorithm of multi-frequency sine signal - based on the frequency domain of the linear phase alignment algorithm. Effective solution to the difficulties in the frequency domain alignment algorithm processing phase transition from -180 degrees to 180 degrees, and we verify the correctness and versatility of the new method. Next, we discuss the frequency domain alignment algorithm used for the measurement of the two-port network, given the linear phase delay solving the amplifier input signal and the high-level phase distortion. Finally, some experiments to test the alignment algorithm based on linear phase in the frequency domain. We take advantage of this new method to analysis of spectral information vector signal source; by inverting amplifier performance characterization confirmed the advantages of this new method compared to the conventional frequency domain alignment algorithm; and use of the new method to obtain the different moments of the vector signal source emitting the actual beginning of the phase of the signal. Through this research work, the phase analysis method to develop a simple and effective phase analysis method is proposed. These efforts will be the next generation to make a positive contribution to the development of broadband high-speed system.
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