移动多媒体无线覆盖与覆盖效果测试

发布时间：2018-06-04 11:24

本文选题：中国移动多媒体广播 + 信道　；参考：《吉林大学》2014年硕士论文

【摘要】：随着信息媒介的不断更新，应运而生了一个全新的概念“手机电视”。外国多种的手机电视标准(ISDB-T、DVB-H、MediaFLO、DMB)日趋完善，并成功的进行了商业运营。我国也于2003年开始着手研究新一代的移动多媒体广播技术，并在2006年正式提出了具有完全自主知识产权的中国移动多媒体广播CMMB(China MobileMultimedia Broadcast)。本文介绍了移动多媒体广播的出现的背景，发展情况，关键技术和研究现状。为了保障传输质量和用户的收看效果，如何进行无线覆盖，解决无线覆盖中遇到的一些问题，如何对覆盖效果进行测试是本文探讨的重点。论文中介绍了电磁波的分类、信道环境分类、信号损耗分类。电磁波的分类是根据电磁波经过不同路径到达终点所区分的。传播信道的分类则是根据不同的地理环境，经过概率学计算得出的数学模型。信号损耗分类体现了电磁波在不同情况下的功率损耗的特性。作为本文的研宄对象，CMMB的无线覆盖是重点探讨的问题。首先，介绍了CMMB的网络架构，解释了信号由卫星传输至地面，再由发射机发射至移动终端上的过程。 CMMB网络覆盖系统通信系统，包括最基本的软件和硬件，硬件设计包括发射系统、传输网络、配电系统、监控系统等多个独立系统的结合体，软件包括信道传输指令，CA加解密系统指令、信源编解码等多方面的传输和控制系统，更加复杂包括组网系统、应用软件系统、用户业务支撑系统等，另外还有实际覆盖效果测试部分；网络覆盖理论上完成，，测试工作也是必须的，测试是效果的保证，只有经过实际测试的覆盖效果才是科学可运行的系统，只有经过测试的覆盖工程才能更好的完善优化现有的网络。本文主要结合沈阳市网络覆盖的实际工作，研究其网络覆盖的可行性、系统的基础知识、基本架构，介绍了其中运用到的关键技术和要完成的功能。本文的目的是对无线覆盖的基础做些研究，并运用到实际当中，把理论研究和实践运用结合起来。
[Abstract]:With the continuous updating of information media, a new concept of mobile TV has emerged. Various foreign mobile TV standards ISDB-TU DVB-HU MediaFLODMBs are becoming more and more perfect, and successful commercial operation has been carried out. In 2003, China began to study the new generation of mobile multimedia broadcasting technology. In 2006, China Mobile Multimedia Broadcasting (CMMB(China MobileMultimedia) with completely independent intellectual property rights was formally proposed. This paper introduces the background, development, key technology and research status of mobile multimedia broadcasting. In order to ensure the quality of transmission and the watching effect of users, how to carry out wireless coverage, how to solve some problems encountered in wireless coverage, and how to test the coverage effect is the focus of this paper. In this paper, the classification of electromagnetic wave, channel environment and signal loss are introduced. The classification of electromagnetic waves is based on the electromagnetic waves passing through different paths to the end point. The classification of propagation channel is a mathematical model based on different geographical environment and probabilistic calculation. Signal loss classification reflects the characteristics of electromagnetic wave power loss under different conditions. As the research object of this paper, the wireless coverage of CMMB is an important issue. Firstly, the network architecture of CMMB is introduced, and the process of signal transmission from satellite to ground and then from transmitter to mobile terminal is explained. CMMB network coverage system communication system, including the most basic software and hardware, hardware design including transmission system, transmission network, distribution system, monitoring system and other independent system combination, The software includes many transmission and control systems, such as channel transmission instruction, CA encryption and decryption system instruction, source coding and decoding, etc. The software is more complex, including networking system, application software system, user business support system, etc. In addition, there is the actual coverage effect test part; the network coverage theory is completed, the test work is also necessary, the test is the guarantee of the effect, only after the actual test coverage effect is the scientific operational system. Only the tested coverage project can better improve and optimize the existing network. Based on the practical work of network coverage in Shenyang, this paper studies the feasibility of network coverage, the basic knowledge of the system, the basic structure, and introduces the key technologies and functions to be completed. The purpose of this paper is to do some research on the basis of wireless coverage, and apply it to practice, combining theoretical research with practical application.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN934

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