本文選題：中國移動(dòng)多媒體廣播 + 信道��； 參考：《吉林大學(xué)》2014年碩士論文

【摘要】：隨著信息媒介的不斷更新，應(yīng)運(yùn)而生了一個(gè)全新的概念“手機(jī)電視”。外國多種的手機(jī)電視標(biāo)準(zhǔn)(ISDB-T、DVB-H、MediaFLO、DMB)日趨完善，并成功的進(jìn)行了商業(yè)運(yùn)營。我國也于2003年開始著手研究新一代的移動(dòng)多媒體廣播技術(shù)，并在2006年正式提出了具有完全自主知識產(chǎn)權(quán)的中國移動(dòng)多媒體廣播CMMB(China MobileMultimedia Broadcast)。本文介紹了移動(dòng)多媒體廣播的出現(xiàn)的背景，發(fā)展情況，關(guān)鍵技術(shù)和研究現(xiàn)狀。為了保障傳輸質(zhì)量和用戶的收看效果，如何進(jìn)行無線覆蓋，解決無線覆蓋中遇到的一些問題，如何對覆蓋效果進(jìn)行測試是本文探討的重點(diǎn)。 論文中介紹了電磁波的分類、信道環(huán)境分類、信號損耗分類。電磁波的分類是根據(jù)電磁波經(jīng)過不同路徑到達(dá)終點(diǎn)所區(qū)分的。傳播信道的分類則是根據(jù)不同的地理環(huán)境，經(jīng)過概率學(xué)計(jì)算得出的數(shù)學(xué)模型。信號損耗分類體現(xiàn)了電磁波在不同情況下的功率損耗的特性。作為本文的研宄對象，CMMB的無線覆蓋是重點(diǎn)探討的問題。首先，介紹了CMMB的網(wǎng)絡(luò)架構(gòu)，解釋了信號由衛(wèi)星傳輸至地面，再由發(fā)射機(jī)發(fā)射至移動(dòng)終端上的過程。 CMMB網(wǎng)絡(luò)覆蓋系統(tǒng)通信系統(tǒng)，包括最基本的軟件和硬件，硬件設(shè)計(jì)包括發(fā)射系統(tǒng)、傳輸網(wǎng)絡(luò)、配電系統(tǒng)、監(jiān)控系統(tǒng)等多個(gè)獨(dú)立系統(tǒng)的結(jié)合體，軟件包括信道傳輸指令，CA加解密系統(tǒng)指令、信源編解碼等多方面的傳輸和控制系統(tǒng)，更加復(fù)雜包括組網(wǎng)系統(tǒng)、應(yīng)用軟件系統(tǒng)、用戶業(yè)務(wù)支撐系統(tǒng)等，另外還有實(shí)際覆蓋效果測試部分；網(wǎng)絡(luò)覆蓋理論上完成，，測試工作也是必須的，測試是效果的保證，只有經(jīng)過實(shí)際測試的覆蓋效果才是科學(xué)可運(yùn)行的系統(tǒng)，只有經(jīng)過測試的覆蓋工程才能更好的完善優(yōu)化現(xiàn)有的網(wǎng)絡(luò)。本文主要結(jié)合沈陽市網(wǎng)絡(luò)覆蓋的實(shí)際工作，研究其網(wǎng)絡(luò)覆蓋的可行性、系統(tǒng)的基礎(chǔ)知識、基本架構(gòu)，介紹了其中運(yùn)用到的關(guān)鍵技術(shù)和要完成的功能。本文的目的是對無線覆蓋的基礎(chǔ)做些研究，并運(yùn)用到實(shí)際當(dāng)中，把理論研究和實(shí)踐運(yùn)用結(jié)合起來。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN934

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 房雪蓮;蒲云東;;同頻直放站原理及其帶外抑制能力測試[J];江西通信科技;2009年02期

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