本文選題：單向傳輸 + 容錯(cuò)性��； 參考：《國防科學(xué)技術(shù)大學(xué)》2014年碩士論文

【摘要】：互聯(lián)網(wǎng)的誕生為人類社會(huì)提供了一個(gè)快速獲得實(shí)時(shí)數(shù)據(jù)信息的平臺(tái),與此同時(shí)互聯(lián)網(wǎng)的安全性問題給接入互聯(lián)網(wǎng)的計(jì)算機(jī)帶了信息泄露的風(fēng)險(xiǎn)。為了保證高密級(jí)網(wǎng)絡(luò)在獲取互聯(lián)網(wǎng)實(shí)時(shí)信息的同時(shí)確保信息不泄露,技術(shù)人員開發(fā)出單向傳輸系統(tǒng)作為高密級(jí)網(wǎng)絡(luò)從低密級(jí)網(wǎng)絡(luò)安全地獲取信息的工具。因?yàn)樵撓到y(tǒng)遵循嚴(yán)格單向無反饋的文件傳輸方式,文件傳輸可靠性難以保證。所以單向傳輸系統(tǒng)的可靠性問題已經(jīng)成為限制其市場發(fā)展的瓶頸。首先,本文針對(duì)單向傳輸系統(tǒng)中的丟包問題進(jìn)行研究。造成單向傳輸系統(tǒng)中文件傳輸可靠性問題的主要原因是傳輸過程中的丟包現(xiàn)象,傳輸過程中的丟包現(xiàn)象一般分為隨機(jī)丟包與擁塞丟包兩類。通過實(shí)驗(yàn)與分析得到結(jié)論:單向傳輸系統(tǒng)中的丟包率高低與傳輸速率和包負(fù)載大小有關(guān)。通過理論分析發(fā)現(xiàn)擁塞丟包事件之間存在馬爾科夫相關(guān)性,表明在傳輸過程中擁塞丟包事件發(fā)生時(shí)有極大的概率伴隨著連續(xù)丟包。接著,本文在基于丟包問題研究結(jié)論的基礎(chǔ)上提出使用CRS糾刪碼提高單向傳輸?shù)目煽啃�。利用糾刪碼進(jìn)行冗余編碼后傳輸,能夠提高傳輸過程的可靠性。經(jīng)過試驗(yàn)驗(yàn)證發(fā)現(xiàn),CRS糾刪碼相比傳統(tǒng)的RS糾刪碼在編碼與重構(gòu)效率有極大提高,并且在犧牲一定帶寬資源的前提下能夠極大提高單向文件傳輸容錯(cuò)性。最后,本文提出對(duì)CRS糾刪碼進(jìn)行編碼效率優(yōu)化,經(jīng)過算法分析與實(shí)驗(yàn)論證得出以下四個(gè)優(yōu)化步驟:1.對(duì)CRS生成矩陣進(jìn)行優(yōu)化。2.選取適當(dāng)大小的數(shù)據(jù)緩沖區(qū)與編碼緩沖區(qū)。3.根據(jù)實(shí)際需求選取(n,m,w)的編碼組合。4.根據(jù)編碼組合計(jì)算出最優(yōu)數(shù)據(jù)包大小。
[Abstract]:The birth of the Internet provides a platform for human society to obtain real-time data information quickly. At the same time, the security of the Internet brings the risk of information leakage to the computers connected to the Internet. In order to ensure that the high secret network can obtain the real-time information of the Internet and ensure that the information does not leak, technicians have developed a one-way transmission system as a tool for the high secret network to obtain the information safely from the low level network. Because the system follows strict one-way file transfer without feedback, it is difficult to guarantee the reliability of file transmission. Therefore, the reliability of one-way transmission system has become a bottleneck restricting its market development. Firstly, this paper studies the problem of packet loss in one-way transmission system. The main reason for the reliability of file transmission in unidirectional transmission system is packet loss, which is generally divided into random packet loss and congestion packet loss. Through experiment and analysis, it is concluded that the rate of packet loss in one-way transmission system is related to the transmission rate and the size of packet load. It is found that there is a Markov correlation between congestion and packet loss events through theoretical analysis, which indicates that there is a great probability that congestion packet loss events occur with continuous packet loss in the transmission process. Then, based on the research results of packet loss problem, CRS erasure codes are proposed to improve the reliability of one-way transmission. The reliability of transmission process can be improved by using erasure code after redundant coding. Experimental results show that CRS erasure codes can greatly improve the coding and reconstruction efficiency compared with the traditional RS erasure codes, and can greatly improve the fault-tolerance of unidirectional file transmission at the expense of certain bandwidth resources. Finally, the coding efficiency of CRS erasure codes is optimized. The following four optimization steps: 1: 1 are obtained through algorithm analysis and experimental demonstration. Optimize CRS generation matrix. Select the appropriate size of the data buffer and encoding buffer. 3. According to the actual requirements, select the coding combination. 4. 4. The optimal packet size is calculated according to the coding combination.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.08

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 路強(qiáng)輝;;網(wǎng)絡(luò)信息安全單向傳輸系統(tǒng)的設(shè)計(jì)應(yīng)用[J];民營科技;2014年05期

2 羅象宏;舒繼武;;存儲(chǔ)系統(tǒng)中的糾刪碼研究綜述[J];計(jì)算機(jī)研究與發(fā)展;2012年01期

3 富元;呂建新;;基于UDP的可靠傳輸協(xié)議的研究與實(shí)現(xiàn)[J];光通信研究;2009年05期

4 周利平;李志蜀;周勇;雷啟岷;殷峰;;使用前向糾錯(cuò)技術(shù)的動(dòng)態(tài)主動(dòng)可靠組播協(xié)議[J];電子科技大學(xué)學(xué)報(bào);2007年S3期

，

本文編號(hào)：2075841