相位噪声频域测量关键算法研究

发布时间：2018-05-23 08:15

本文选题：相位噪声 + 分段谱估计法　；参考：《西安电子科技大学》2015年硕士论文

【摘要】：相位噪声是指系统(如各种射频器件)在各种噪声的作用下引起的系统输出信号相位的随机变化,是衡量频率源优劣的一项重要技术指标。随着电子技术的发展,信号的相位噪声对于电子系统特别是接收机、移动通讯系统、多普勒雷达系统、导航系统等有着及其重要的影响。因此相位噪声的测量方法已成为电子测量领域内研究的重要内容。谱估计方法广泛应用于相位噪声测量系统,但是这些方法都难以兼顾高频率分辨率和宽频带分析这两项互相矛盾的指标,为此我们课题组提出了频谱分段法。本文介绍了几种较常用的谱估计方法,并通过MATLAB仿真对其估计性能进行了比较,为实际工程应用提供选择依据。重点是针对已提出的频谱分段法,分别采用不同的方法在DSP上进行了分段谱估计法的实验,在验证了分段谱估计法对于兼顾高频率分辨率和宽频带分析两项指标的有效性的同时,证明了频谱分段法对于谱估计法的普遍适用性。此外,本文对已提出的基于数学模型的相位噪声测量方法进行了更深入的研究,主要包括两部分内容:将之前研究中忽略掉的近载波处的高斯噪声部分考虑在内,进一步完善之前的拟合方法,减小相位噪声估计误差,并通过MATLAB仿真验证了方法的有效性;将改进的数学模型相位噪声测量方法推广到脉冲调制信号的相位噪声测量中,并通过MATLAB仿真验证方法的有效性。
[Abstract]:Phase noise refers to the random variation of the system output signal phase caused by various noises, which is an important technical index to measure the advantages and disadvantages of the frequency source. With the development of the electronic technology, the phase noise of the signal is to the electronic system especially the receiver, the mobile communication system, the Doppler radar system. The method of measuring the phase noise has become an important part of the research in the field of electronic measurement. The method of spectral estimation is widely used in the phase noise measurement system, but these methods are difficult to take into account the two contradictory indexes of high frequency resolution and broadband analysis. This paper presents the spectrum segmentation method. This paper introduces several commonly used spectral estimation methods, and compares the estimation performance by MATLAB simulation, and provides a selection basis for practical engineering applications. The emphasis is on the proposed spectrum segmentation method, and the experiment of piecewise spectral estimation is carried out on DSP by different methods. It is proved that the piecewise spectral estimation is effective for both the high frequency resolution and the two indexes of the broadband analysis, and the universal applicability of the spectrum segmentation method to the spectral estimation is proved. In addition, the proposed method of phase noise measurement based on the mathematical model is further studied, including two parts. The Gauss noise part of the near carrier which was neglected in the previous study is taken into consideration, and the fitting method is further perfected to reduce the phase noise estimation error, and the effectiveness of the method is verified by MATLAB simulation. The improved phase noise measurement method of the mathematical model is extended to the phase noise measurement of the pulse modulation signal. The effectiveness of the MATLAB simulation verification method.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB53

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