GSM-R中互调干扰的研究

发布时间：2018-04-25 22:25

本文选题：GSM-R系统 + 互调干扰　；参考：《兰州交通大学》2014年硕士论文

【摘要】：GSM-R系统是一种基于目前世界最成熟、最通用的公用无线通信系统平台上的、专门为满足铁路应用而开发的数字式无线通信系统。但是GSM-R系统通信信道受干扰影响大，在GSM-R系统无线通信工作的电磁环境中，无线传输过程中不可避免的会受到各方面噪声的干扰。这时干扰会影响通信通话质量、增加通话过程中的查错，并且降低频谱的使用效率。GSM-R系统作为铁路专用移动通信系统，它的安全性和高效性将直接关系到我国铁路事业和国民经济的发展，因此，我们要求GSM-R系统具有更高的可靠性，从而保障列车的安全运行。互调干扰是影响GSM-R系统安全的一大隐患，而目前解决互调干扰的方法都有它们的局限性，本文所做的主要工作就是对已有算法进行改进，能在抑制互调干扰的能力上有所改观。本文的主要研究工作如下： (1)对GSM-R系统进行分析，介绍互调干扰产生的原因；并且介绍解决互调干扰的一些技术。对功率放大器线性化技术进行分析，并介绍目前的功率放大器线性化技术，包括前馈、反馈、自适应预失真以及采用非线性元件组成的线性功放等，并对它们的工作原理以及对它们的优缺点进行比较。 (2)对预失真线性化技术进行着重分析，主要针对预失真线性化技术进行研究，它比较稳定、精度比较高，前景最看好，是放大器线性化的重要手段。改进现有算法，把数学中的二分法与割线法相结合，给出算法步骤，通过这种方法可以大致估测出含根区间，同时我们还可以通过割线的手段，加快算法的收敛速度，对算法进行测试。并对改进算法进行总结。 (3)构建GSM-R系统网络系统路径损耗模型，并对基于频率规划的互调干扰算法进行比较。最后对互调干扰的抑制方法进行总结。
[Abstract]:GSM-R system is a kind of digital wireless communication system which is based on the most mature and universal public wireless communication system platform in the world and is specially developed to meet the railway application. However, the communication channel of GSM-R system is greatly affected by the interference. In the electromagnetic environment of GSM-R system wireless communication, it is inevitable that all kinds of noise will interfere in the process of wireless transmission. In this case, the interference will affect the communication quality, increase the error detection during the call process, and reduce the efficiency of the spectrum use. GSM-R system can be used as the railway special mobile communication system. Its safety and efficiency will be directly related to the development of our country's railway and national economy. Therefore, we require higher reliability of the GSM-R system to ensure the safe operation of the train. Intermodulation interference is a hidden trouble affecting the security of GSM-R system, and the methods to solve intermodulation interference have their limitations. The main work of this paper is to improve the existing algorithms and improve the ability of intermodulation interference suppression. The main work of this paper is as follows: 1) analyze the GSM-R system, introduce the causes of Intermodulation interference, and introduce some techniques to solve Intermodulation interference. The linearization technology of power amplifier is analyzed, and the current linearization technology of power amplifier is introduced, including feedforward, feedback, adaptive predistortion and linear power amplifier composed of nonlinear elements, etc. Their working principle and their advantages and disadvantages are compared. 2) the predistortion linearization technology is analyzed emphatically, and the predistortion linearization technology is mainly studied. It is stable, accurate and promising. It is an important means of amplifier linearization. By improving the existing algorithm, combining the dichotomy method with the Secant method, the steps of the algorithm are given. By this method, the root interval can be roughly estimated. At the same time, we can also speed up the convergence of the algorithm by means of the Secant. Test the algorithm. The improved algorithm is summarized. Thirdly, the path loss model of GSM-R network system is constructed, and the intermodulation interference algorithm based on frequency planning is compared. Finally, the methods of intermodulation interference suppression are summarized.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.532

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