The Research Of Network Coding In Multicast System

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.