关键词: 计算机网络，P2P TV，网络编码

Abstract: Network coding can achieve maximum throughput of multicast, which shows the potential to decrease playback delay of users in P2P TV system, to improve delivery ratio, and therefore to improve video duality of the whole system. In order to improve the performance of the P2P I}V system, a system based on Random Linear Nework Coding(RLNC)，called CORS TV, was designed and implemented with carefully designed topology construction and data transmission. Full taking advantage of network coding and further improving the performance of P2P TV, CORS I}V has a modular architecture,and each function module runs an independent thread. The system integrates Gossip protocol for topology construction, uses most first algorithm for determining initial playback point, and employs push based transmission scheme with First Come First Served(FCFS) transmission algorithm. The experiment results validate the effectiveness of the CORS TV design. Compared with current P2P TV systems, it has the advantages of lower redundancy ratio,higher delivery ratio and better playback quality of users.

Key words: Computer networks,P2P TV,Network coding