本文選題：噴泉碼　切入點(diǎn)：度分布　出處：《河北工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：信息傳輸質(zhì)量與速度隨著科學(xué)技術(shù)的發(fā)展引起了人們的高度重視。在傳統(tǒng)傳輸機(jī)制中,反饋和自動(dòng)重發(fā)傳輸效率低,增加了傳輸時(shí)間。噴泉碼是一種無碼率碼,不需要反饋和自動(dòng)重發(fā)請求,因此,節(jié)省了傳輸時(shí)間,避免了反饋風(fēng)暴問題。本文從噴泉碼影響因素入手,針對影響因素對噴泉碼編譯碼的影響進(jìn)行了詳盡的研究,得出魯棒孤波分布性能較優(yōu)。在此基礎(chǔ)上進(jìn)行了噴泉碼編譯碼方案的研究。針對現(xiàn)有編譯碼方案的不足,本文引入了混沌的概念,充分利用混沌映射產(chǎn)生的序列遍歷性、均勻性等特點(diǎn),給出了一種基于混沌映射的噴泉碼編譯碼方案。仿真結(jié)果表明該方案的編譯碼結(jié)果具有較好的穩(wěn)定性,并提高了譯碼成功率。其次,總結(jié)歸納了多種經(jīng)典噴泉碼不等差錯(cuò)保護(hù)(UEP)方案。經(jīng)典的噴泉碼UEP方案包括設(shè)置權(quán)重因子的UEP方案,基于擴(kuò)展窗的噴泉碼UEP方案以及采用復(fù)制窗方法實(shí)現(xiàn)的UEP方案。對這幾種方案進(jìn)行了仿真、分析,剖析出經(jīng)典不等差錯(cuò)保護(hù)方案的特點(diǎn)。經(jīng)典的不等差錯(cuò)保護(hù)方案有的犧牲了次重要數(shù)據(jù)的編譯碼成功率,有的不等差錯(cuò)保護(hù)特性不明顯。在對仿真結(jié)果總結(jié)、分析的基礎(chǔ)上,給出了一種基于復(fù)制窗—擴(kuò)展窗的噴泉碼不等差錯(cuò)保護(hù)方案。仿真結(jié)果表明此方案既增強(qiáng)了UEP特性,又改善了LIB的抗誤碼性能。
[Abstract]:With the development of science and technology, people attach great importance to the quality and speed of information transmission. In the traditional transmission mechanism, the transmission efficiency of feedback and automatic retransmission is low and the transmission time is increased. There is no need for feedback and automatic retransmission, so the transmission time is saved and the problem of feedback storm is avoided. It is concluded that the robust solitary wave distribution is better. Based on this, the coding and decoding schemes of fountain code are studied. In view of the shortcomings of the existing encoding and decoding schemes, the concept of chaos is introduced in this paper, which makes full use of the ergodicity of sequences generated by chaotic mapping. In this paper, a fountain code encoding and decoding scheme based on chaotic mapping is presented. The simulation results show that the scheme has good stability and improves the decoding success rate. Several classical fountain code unequal error protection schemes are summarized. The classical fountain code UEP scheme includes UEP scheme with weight factor. The UEP scheme of fountain code based on extended window and the UEP scheme realized by replicating window are simulated and analyzed. The characteristics of the classical unequal error protection scheme are analyzed. Some of the classical unequal error protection schemes sacrifice the success rate of encoding and decoding of the secondary important data, while some of the unequal error protection schemes are not obvious. A fountain code unequal error protection scheme based on replica window and extended window is presented. The simulation results show that this scheme not only enhances the characteristics of UEP, but also improves the error-resistant performance of LIB.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN911.22

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