连续相位调制同步技术研究
发布时间：2018-12-19 20:54
【摘要】：随着数字通信的不断发展,高频谱效率和高功率效率的调制方式越来越受到人们的重视。连续相位调制作为一种有记忆、恒包络调制技术具备这两方面优良特性,使其受到了多种无线通信系统的青睐。但由于解调复杂和同步困难,使其应用范围受到了限制。因此,对连续相位调制信号同步技术的研究具有举足轻重的意义。本课题着眼于连续相位调制,以矢量信号分析为应用背景,对定时同步、载波频率同步和载波相位同步三个关键技术分别进行了研究。在每种关键技术研究过程中,先从连续相位调制的特殊类型——MSK类型调制入手,为矢量信号分析提供高精度的同步方案,具备一定的理论和实践基础后,然后再将研究对象扩充至一般类型的连续相位调制。首先详细介绍了CPM信号基本理论,包括数学模型和频谱特性,分析其高频谱效率的具体原因,为算法研究奠定了基础。其次对定时同步技术进行了讨论,对多种定时误差估计算法进行了仿真,根据分析结果,兼顾估计精度和稳定性,选用了改进型MCM算法作为矢量信号分析中MSK类型调制的定时同步技术方案;并针对一般类型CPM信号的前向NDA定时同步算法精度低的问题,在该算法模型的基础上利用牛顿迭代法提出了一种改进算法,提高了估计精度。然后,对载波频率同步技术进行了研究,针对矢量信号分析中MSK类型调制大频偏和高精度的需求,本文提出了一种延迟相乘方法和最大似然方法级联的频率同步算法,两步同步模式不仅具有大频偏的估计范围,还具有高精度的性能,并将其作为MSK类型调制的频率同步方案,同时为一般类型CPM调制提出了更高精度的非线性变换频率同步算法,与现有算法进行了比较和分析;之后,对载波相位同步技术进行了研究,将基于PAM分解和基于泰勒级数展开的两种最大似然算法进行了对比,仿真结果表明,基于泰勒级数展开的最大似然算法具有更高精度,并将选其作为矢量信号分析中的载波相位同步方案,并对一般类型的CPM调制的2P-Power相位同步算法进行了研究,不同的调制参数,该算法具有不同的性能。
[Abstract]:With the development of digital communication, more and more attention has been paid to the modulation of high spectral efficiency and high power efficiency. As a kind of memory and constant envelope modulation technology, continuous phase modulation has been favored by many wireless communication systems because of its excellent characteristics. However, because of the complexity of demodulation and the difficulty of synchronization, its application scope is limited. Therefore, it is very important to study the synchronization technology of continuous phase modulation signal. This paper focuses on continuous phase modulation and studies three key technologies, namely timing synchronization, carrier frequency synchronization and carrier phase synchronization, based on vector signal analysis. In each key technology research process, we start with the special type of continuous phase modulation, MSK type modulation, and provide a high-precision synchronization scheme for vector signal analysis, which has a certain theoretical and practical foundation. Then the object of study is extended to a general type of continuous phase modulation. Firstly, the basic theory of CPM signal is introduced in detail, including the mathematical model and spectrum characteristics, and the reasons for its high spectral efficiency are analyzed, which lays a foundation for the research of the algorithm. Secondly, the timing synchronization technology is discussed, and a variety of timing error estimation algorithms are simulated. According to the analysis results, the estimation accuracy and stability are taken into account. The improved MCM algorithm is selected as the timing synchronization scheme of MSK modulation in vector signal analysis. Aiming at the problem of low precision of forward NDA timing synchronization algorithm for general type of CPM signals, an improved algorithm is proposed based on the model of the algorithm and Newton iteration method is used to improve the estimation accuracy. Then, the carrier frequency synchronization technology is studied. Aiming at the demand of large frequency offset and high precision of MSK modulation in vector signal analysis, this paper proposes a frequency synchronization algorithm with concatenated delay multiplication method and maximum likelihood method. The two-step synchronization mode not only has large frequency offset estimation range, but also has high precision performance. It is regarded as the frequency synchronization scheme of MSK modulation. At the same time, a higher precision nonlinear transform frequency synchronization algorithm is proposed for general type CPM modulation. Compared with the existing algorithms, the algorithm is compared and analyzed. After that, the carrier phase synchronization technology is studied, and two kinds of maximum likelihood algorithms based on PAM decomposition and Taylor series expansion are compared. The simulation results show that the maximum likelihood algorithm based on Taylor series expansion has higher accuracy. It is chosen as the carrier phase synchronization scheme in vector signal analysis, and the general 2P-Power phase synchronization algorithm of CPM modulation is studied. Different modulation parameters show that the algorithm has different performance.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN911.3
，
本文编号：2387438
[Abstract]:With the development of digital communication, more and more attention has been paid to the modulation of high spectral efficiency and high power efficiency. As a kind of memory and constant envelope modulation technology, continuous phase modulation has been favored by many wireless communication systems because of its excellent characteristics. However, because of the complexity of demodulation and the difficulty of synchronization, its application scope is limited. Therefore, it is very important to study the synchronization technology of continuous phase modulation signal. This paper focuses on continuous phase modulation and studies three key technologies, namely timing synchronization, carrier frequency synchronization and carrier phase synchronization, based on vector signal analysis. In each key technology research process, we start with the special type of continuous phase modulation, MSK type modulation, and provide a high-precision synchronization scheme for vector signal analysis, which has a certain theoretical and practical foundation. Then the object of study is extended to a general type of continuous phase modulation. Firstly, the basic theory of CPM signal is introduced in detail, including the mathematical model and spectrum characteristics, and the reasons for its high spectral efficiency are analyzed, which lays a foundation for the research of the algorithm. Secondly, the timing synchronization technology is discussed, and a variety of timing error estimation algorithms are simulated. According to the analysis results, the estimation accuracy and stability are taken into account. The improved MCM algorithm is selected as the timing synchronization scheme of MSK modulation in vector signal analysis. Aiming at the problem of low precision of forward NDA timing synchronization algorithm for general type of CPM signals, an improved algorithm is proposed based on the model of the algorithm and Newton iteration method is used to improve the estimation accuracy. Then, the carrier frequency synchronization technology is studied. Aiming at the demand of large frequency offset and high precision of MSK modulation in vector signal analysis, this paper proposes a frequency synchronization algorithm with concatenated delay multiplication method and maximum likelihood method. The two-step synchronization mode not only has large frequency offset estimation range, but also has high precision performance. It is regarded as the frequency synchronization scheme of MSK modulation. At the same time, a higher precision nonlinear transform frequency synchronization algorithm is proposed for general type CPM modulation. Compared with the existing algorithms, the algorithm is compared and analyzed. After that, the carrier phase synchronization technology is studied, and two kinds of maximum likelihood algorithms based on PAM decomposition and Taylor series expansion are compared. The simulation results show that the maximum likelihood algorithm based on Taylor series expansion has higher accuracy. It is chosen as the carrier phase synchronization scheme in vector signal analysis, and the general 2P-Power phase synchronization algorithm of CPM modulation is studied. Different modulation parameters show that the algorithm has different performance.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN911.3
，
本文编号：2387438
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