高速移动通信链路信道特性及模型研究

发布时间：2017-12-30 23:23

本文关键词：高速移动通信链路信道特性及模型研究　出处：《北京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：快速发展的卫星移动通信具有覆盖范围广、工作频带宽、通信效率和灵活度高等特点。非静止轨道卫星轨道高度低、运动速度高，导致信道特性复杂且随时间动态变化，因此，对其通信链路的研究是卫星移动通信领域的难点和重点之一。本文对非静止轨道卫星通信系统的卫星与地面终端和星间两种高速移动通信链路的信道特性及模型进行了研究。针对链路的信道特性，详细研究和仿真了卫星轨道估计算法，并选用基于SGP模型的轨道估计算法对卫星与地面终端通信链路的路径损耗、传播时延、多普勒频移及其变化率等信道特性进行了分析和仿真；另外，通过分析星间链路的空间几何关系，对同等高度和不等高度星间链路的信道特性进行了计算和仿真。针对链路的信道模型，详细分析了C.Loo和Corazza两种窄带信道模型，并提出一种六径信道模型，该模型可以通过调整路径个数和模型参数实现不同的宽带和窄带信道模拟。另外，基于六径信道模型，分析和提取了三种典型终端环境下的模型参数。在上述分析和仿真的基础上，本文设计和实现了高速移动通信链路控制软件。该软件能够利用卫星和地面终端参数或星间链路的卫星参数实时计算链路的信道特性，并将信道特性与模型参数通过网络通信传送至专用信道模拟器，使专用信道模拟器完成对相应信道的模拟。另外，，该软件还可以完成对通信终端调制方式、符号速率等参数的控制，并在测试平台工作过程中实时对系统的性能进行评估。最后，本文对控制软件的参数计算、可视化显示、网络通信及系统性能评估等主要功能进行了测试，验证了软件功能的完善性。设计非静止轨道卫星通信链路系统时，研究链路信道特性并建立准确的信道模型、探索高效信道估计算法，对于实现高可靠性的卫星移动通信具有重要的研究意义，也是本文致力研究和解决的主要问题。
[Abstract]:The rapid development of satellite mobile communication has the characteristics of wide coverage, wide operating bandwidth, high communication efficiency and high flexibility, etc. The orbit height of non-geostationary orbit satellite is low, and the moving speed of non-geostationary orbit satellite is high. Because of the complexity of the channel characteristics and the dynamic changes with time, the research of the communication link is one of the difficulties and emphases in the field of mobile satellite communication. In this paper, the channel characteristics and models of two kinds of high-speed mobile communication links between satellite and ground terminal and between satellites in non-geostationary orbit satellite communication system are studied. The satellite orbit estimation algorithm is studied and simulated in detail, and the path loss and propagation delay of the satellite and ground terminal communication link are selected based on the orbit estimation algorithm based on SGP model. The channel characteristics such as Doppler frequency shift and its change rate are analyzed and simulated. In addition, by analyzing the spatial geometric relationship of the intersatellite link, the channel characteristics of the same height and unequal altitude intersatellite links are calculated and simulated. Two narrowband channel models, C.Loo and Corazza, are analyzed in detail, and a six-path channel model is proposed. The model can adjust the number of paths and model parameters to achieve different broadband and narrowband channel simulation. In addition, based on the six-path channel model, the model parameters in three typical terminal environments are analyzed and extracted. Based on the above analysis and simulation. In this paper, a high speed mobile communication link control software is designed and implemented, which can calculate the channel characteristics of the link in real time using the satellite and ground terminal parameters or the satellite parameters of the intersatellite link. The channel characteristics and model parameters are transmitted to the special channel simulator through the network, so that the special channel simulator can simulate the corresponding channel. In addition, the software can also complete the modulation mode of the communication terminal. Control of parameters such as symbol rate, and real-time evaluation of the performance of the system in the process of testing platform. Finally, this paper calculates the parameters of the control software, visual display. The main functions such as network communication and system performance evaluation are tested to verify the perfection of the software function. When designing the non-geostationary orbit satellite communication link system, the link channel characteristic is studied, the accurate channel model is established, and the efficient channel estimation algorithm is explored. It is of great significance to realize high reliability satellite mobile communication, and it is also the main problem that this paper devotes to study and solve.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN927.23

【参考文献】