本文選題：組播 + 數(shù)據(jù)分發(fā)��； 參考：《電子科技大學》2017年碩士論文

【摘要】：隨著互聯(lián)網(wǎng)技術的不斷發(fā)展,網(wǎng)絡傳輸速率和質量不斷提高,高清視頻、音頻等多媒體文件的需求也變得越來越普遍。然而由于這些文件大多都比較大,在網(wǎng)絡中進行傳輸時就會占用較多的帶寬資源,因此如何能夠更有效地利用網(wǎng)絡帶寬資源并實現(xiàn)高速可靠的數(shù)據(jù)分發(fā),已經(jīng)成為了一個重要的研究課題。本文為了實現(xiàn)無線網(wǎng)絡數(shù)據(jù)分發(fā)系統(tǒng)的多媒體文件高速分發(fā),針對該系統(tǒng)的實時性、傳輸?shù)母咝院涂煽啃孕枨?首先對當前主要的數(shù)據(jù)分發(fā)方式進行了分析和研究,然后結合實際需求設計提出了一種組播數(shù)據(jù)分發(fā)系統(tǒng)方案。該方案從組播協(xié)議和應用層編碼兩個方面對提升分發(fā)系統(tǒng)性能進行優(yōu)化。組播協(xié)議方面,在現(xiàn)有的ALC協(xié)議的基礎上引入了數(shù)據(jù)包內容與傳輸文件關聯(lián)的思想,使得終端在接收數(shù)據(jù)包時可以知道該數(shù)據(jù)包內的信息所代表的文件內容,并使用該協(xié)議實現(xiàn)對應的組播系統(tǒng)。應用層編碼方面,在對多種噴泉碼技術進行研究后,提出了一種將降維快速解碼方式與優(yōu)化高斯消元解碼方式相結合的選擇解碼方式,該方式根據(jù)終端接收數(shù)據(jù)包的情況選擇適當?shù)慕獯a方式從而提高解碼效率,最后通過仿真實驗驗證了該解碼方式的高效性。本文的主要研究內容如下:(1)在研究現(xiàn)有噴泉碼技術的基礎上,針對現(xiàn)有RaptorQ碼在解碼時存在的時延和解碼失敗的問題,提出了選擇解碼方案,使得解碼過程可以根據(jù)接收端對傳輸數(shù)據(jù)塊的實際接收情況選擇適當?shù)慕獯a算法進行解碼,從而提高解碼效率。(2)在組播傳輸協(xié)議ALC協(xié)議的基礎上,引入了File Delivery Table機制,并將其改良ALC協(xié)議實現(xiàn)。在數(shù)據(jù)文件進行傳輸時,文件的相關屬性信息將存放在FDT中與數(shù)據(jù)文件一起進行傳輸。在本設計中,由于采用了RaptorQ碼進行應用層編碼,FDT可以更好的幫助接收端對收集的數(shù)據(jù)包進行歸類,方便下一步的解碼。(3)設計了使用RaptorQ碼作為應用層編碼的組播分發(fā)系統(tǒng)的原型模型,并對其各個構成模塊進行了詳細設計與實現(xiàn)。最后,對該系統(tǒng)中的RaptorQ碼的解碼性能進行了測試。
[Abstract]:With the continuous development of Internet technology, the transmission rate and quality of the network are improving, and the demand of high-definition video, audio and other multimedia files is becoming more and more common. However, because most of these files are relatively large, they will occupy more bandwidth resources when they are transmitted in the network. Therefore, how to make more effective use of network bandwidth resources and achieve high-speed and reliable data distribution, Has become an important research topic. In order to realize the high-speed distribution of multimedia files in wireless network data distribution system, aiming at the real-time, high efficiency and reliability requirements of the system, this paper first analyzes and studies the main data distribution methods. Then, a scheme of multicast data distribution system is proposed according to the actual requirements. The scheme optimizes the performance of the distribution system from two aspects: multicast protocol and application layer coding. In multicast protocol, the idea of associating packet content with transmission file is introduced based on the existing ALC protocol, so that the terminal can know the file content represented by the information in the packet when receiving the packet. This protocol is used to implement the corresponding multicast system. In the aspect of application layer coding, after studying various fountain codes, a selective decoding method is proposed, which combines dimension reduction fast decoding method with optimized Gao Si decode mode. In order to improve the decoding efficiency, the decoding efficiency is improved by choosing the appropriate decoding method according to the data packet received by the terminal. Finally, the high efficiency of the decoding method is verified by the simulation experiment. The main research contents of this paper are as follows: (1) based on the research of the existing fountain code technology, aiming at the problems of the delay and the decoding failure of the existing RaptorQ codes, a decoding scheme is proposed. The decoding process can select appropriate decoding algorithm according to the actual reception of the transmission data block at the receiving end, so as to improve the decoding efficiency. (2) on the basis of the multicast transmission protocol ALC protocol, the File Delivery Table mechanism is introduced. And the improved ALC protocol is implemented. When the data file is transferred, the relevant attribute information of the file is stored in FDT for transmission with the data file. In this design, because the RaptorQ code is used for the application layer coding, it can better help the receiver to classify the collected data packets. A prototype model of multicast distribution system using RaptorQ code as application layer coding is designed, and each component module is designed and implemented in detail. Finally, the decoding performance of RaptorQ codes in the system is tested.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN92

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本文編號：1931967