本文關(guān)鍵詞：噴泉碼技術(shù)在下一代廣播網(wǎng)中的應(yīng)用及相應(yīng)協(xié)議棧的開(kāi)發(fā)　出處：《南京郵電大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 噴泉碼 RaptorQ FLUTE 譯碼算法 下一代廣播網(wǎng)

【摘要】：隨著人們?nèi)找嬖鲩L(zhǎng)的物質(zhì)文化需要,用戶對(duì)廣播網(wǎng)業(yè)務(wù)的需求量也在迅猛增長(zhǎng)。在廣播系統(tǒng)中運(yùn)用FEC技術(shù)和相應(yīng)的協(xié)議棧進(jìn)行數(shù)據(jù)推送管理是保證其數(shù)據(jù)大規(guī)�？煽總鬏�?shù)囊环N有效途徑。因此,研究新型的FEC技術(shù)和相應(yīng)協(xié)議棧的應(yīng)用處理機(jī)制對(duì)下一代廣播網(wǎng)具有良好的實(shí)用價(jià)值。噴泉碼作為一種新型的前向糾錯(cuò)碼,因其無(wú)速率編碼特性以及靈活的譯碼機(jī)制非常適用于廣播系統(tǒng),并且其中的Raptor碼已經(jīng)被3GPP MBMS和歐洲D(zhuǎn)VB標(biāo)準(zhǔn)化。FLUTE協(xié)議是支持FEC組件為Raptor碼的單向文件傳輸協(xié)議,適用于廣播系統(tǒng),并已被運(yùn)用于DVB-H的IPDC和3G蜂窩網(wǎng)絡(luò)MBMS的系統(tǒng)中。本文從噴泉碼的實(shí)際應(yīng)用角度出發(fā),對(duì)其譯碼機(jī)制和在下一代廣播網(wǎng)中的應(yīng)用進(jìn)行了研究,主要?jiǎng)?chuàng)新點(diǎn)為:(1)針對(duì)Raptor Q碼存在譯碼時(shí)延和譯碼失敗概率的問(wèn)題現(xiàn)狀,提出了改進(jìn)譯碼算法,使得其譯碼時(shí)延縮短了近50%,并在其譯碼失敗的情況下利用修補(bǔ)譯碼技術(shù)在原有的已經(jīng)譯碼完成的工作基礎(chǔ)上進(jìn)行再次譯碼,避免了重復(fù)譯碼過(guò)程而帶來(lái)的譯碼時(shí)延。(2)將Raptor Q碼用作為FLUTE協(xié)議棧的新型FEC編碼,使得基于FLUTE協(xié)議棧的數(shù)據(jù)推送機(jī)制更加靈活方便。利用噴泉碼的無(wú)速率編碼特點(diǎn)以及靈活的譯碼機(jī)制,在NGB-W中利用廣播系統(tǒng)進(jìn)行大規(guī)模數(shù)據(jù)推送,并結(jié)合蜂窩系統(tǒng)進(jìn)行點(diǎn)播數(shù)據(jù)修補(bǔ)的方案,從而在保證數(shù)據(jù)推送可靠性。(3)設(shè)計(jì)了基于FLUTE協(xié)議棧的數(shù)據(jù)推送系統(tǒng)基本模型,并詳細(xì)說(shuō)明了各個(gè)模塊的基本功能和設(shè)計(jì)細(xì)節(jié)。給出了數(shù)據(jù)推送系統(tǒng)進(jìn)行文件內(nèi)容發(fā)送與接收的具體實(shí)現(xiàn)方案和Raptor Q碼在系統(tǒng)中的性能參數(shù)信息。
[Abstract]:With the increasing material and cultural needs of people. Users' demand for broadcasting network services is also growing rapidly. Using FEC technology and the corresponding protocol stack for data push management in broadcast system is an effective way to ensure the large-scale and reliable transmission of data. . The research on the new FEC technology and the application and processing mechanism of the corresponding protocol stack has good practical value for the next generation broadcasting network. Fountain code is a new forward error correction code. Because of its rateless coding characteristics and flexible decoding mechanism, it is very suitable for broadcast systems. And the Raptor code has been standardized by 3GPP MBMS and European DVB. FLUTE is the unidirectional file transfer protocol which supports the FEC component to Raptor code. It is suitable for broadcast system and has been applied to IPDC of DVB-H and MBMS of 3G cellular network. This paper starts from the practical application of fountain code. The decoding mechanism and its application in the next generation broadcasting network are studied. The main innovation is: 1) aiming at the problem of decoding delay and decoding failure probability of Raptor Q code. An improved decoding algorithm is proposed, which shortens the decoding delay by nearly 50%. In the case of its decoding failure, the patching decoding technique is used to decode again on the basis of the work that has been completed. The decoding delay caused by repeated decoding process is avoided. 2) Raptor Q code is used as a new FEC code of FLUTE protocol stack. It makes the data push mechanism based on FLUTE protocol stack more flexible and convenient, and makes use of the characteristics of Fountain code rate free coding and flexible decoding mechanism. In NGB-W, broadcast system is used to push large scale data, and cellular system is used to repair data on demand. Thus, the basic model of data push system based on FLUTE protocol stack is designed in order to ensure the reliability of data push. The basic functions and design details of each module are explained in detail, and the implementation scheme of sending and receiving file contents in data push system and the performance parameter information of Raptor Q code in the system are given.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN931

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相關(guān)期刊論文 前1條

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本文編號(hào)：1359301