【作者】 宋琦；

【导师】 贺志强；

【作者基本信息】 北京邮电大学 ， 电子与通信工程（专业学位）， 2013， 硕士

【摘要】 网络编码技术自诞生以来,十多年间受到了国内外学者的广泛关注,不论是网络编码基础理论的研究还是与实际场景的结合,都是学者们研究的热点。其中网络编码在多播场景下的应用,由于其广泛的应用场景及网络编码自身的特性,成为了网络编码应用研究的热门话题。网络编码在多播网络中的应用主要体现在网络编码与ARQ技术的结合,使用网络编码方案提高传统选择性重传ARQ的传输效率,带来更高的带宽利用率和编码效率。本论文正是针对网络编码的热门研究点——网络编码在多播网络中的应用,对网络编码的应用方法和其自身的数据包选择算法进行了研究。研究重点在于对多播协同中继网络下网络编码的应用方案设计、方案性能分析及仿真验证,以及对网络编码的数据包选择算法进行研究、设计以及仿真验证。论文首先对现有的多播基础模型下网络编码的应用及分析方法进行研究,继而把网络编码的应用推广到单源多播协同中继及两源多播协同中继场景,在这两个场景下,设计适合的网络编码应用方案并在理论上对方案进行传输带宽的理论值推导。并在两源场景下设计了传输带宽更小、网络编码增益更高的改进的网络编码方案一iXOR-ARQ方案。在理论和仿真值上,验证了iXOR-ARQ方案的优秀性能。进而针对仿真过程中发现的仿真值与理论值的实际偏差,对网络编码自身的数据包选择算法进行研究与改进。通过改进协同用户分组、对接收端进行排序以及对数据包进行排序,设计了三种不同的数据包选择算法,并在仿真值上验证了新的选择算法相对于原有算法的优势。文中的研究验证了网络编码在传输带宽上带来的系统性能改进,网络编码在实际系统,尤其是多播系统下的应用有非常大的潜力。在通信向高速、安全、稳定发展的当下,网络编码在多播网络中的应用极有可能成为未来实施的方向。更多还原

【Abstract】 Network coding has been widely concerned since it was born. Both the basic theory research and the combination with the actual scenario are the hotpots for the research workers. Among the research points, the application of network coding in multicast network is the popular topic for the research of network coding, with its wide application scenario and its character. In multicast scenario, network coding is always used for combination with ARQ, which could increase the transmission efficiency, improve the bandwidth utilization and improve the coding gain.This paper focuses on the application of network coding in multicast scenario who is the popular research issue, carries on some research on the application scheme and the algorithm of packets choosing. One of the main research points is designing the proper scheme for the application of network coding in multicast scenario, analyzing the performance of the application schemes, simulating to demonstrate the analytics. The other research point is researching the algorithm of packets choosing, designing different algorithm and simulating to demonstrate.Firstly, the paper carries some research on the current application and analytical method of network coding in multicast network, and then extends the application of network coding to single source cooperative relay multicast system and two sources cooperative relay multicast system. In the two scenario, designs the proper application scheme and makes theoretical analysis of the transmission bandwidth. In the two sources scenario, designs the improved network coding scheme, iXOR-ARQ scheme, whose transmission bandwidth is lower and network coding gain is high. The theoretical analysis and simulations both demonstrate the advantages of the The theoretical analysis and simulations will demonstrate the advantages of the proposed schemes.Secondly, the paper researches and improves the packet choosing algorithm for the sake of the deviation of theoretical analysis and simulations in the former research. Three different packet choosing algorithms are designed through improving the cooperative users, sequencing the receivers or sequencing the packets. And simulations are taken to demonstrate the advantages of the new algorithm.The research in the paper demonstrates the improvement of network coding on transmission bandwidth, and the huge potential for using in multicast system. For telecommunication is developing for the direction of high speed, safety and robustness, the application of network coding in multicast system is in all likelihood.更多还原