| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 99 === Network coding based P2P file sharing system has been proposed in recent years. It uses the random combination of encoded pieces to make the file sharing more effective. Most of the conventional P2P file sharing systems adopts a random or rarest piece first transmission policy to avoid too many duplicated pieces and rare pieces occurring in the network. Network coding can simply solve this problem. However, some of the studies show that network coding brings the overhead of coding/decoding delay and message overhead ,after all the performance of network coding is not better than other schemes that without network coding. Therefore, we propose a network coding based file sharing system over unstructured P2P networks considering the overhead from the network coding. We make comparisons with other schemes without network coding. Our simulation results show that the proposed network coding based file sharing system is better than others, when the network coding scheme can adopt an appropriate transmission protocol design even though network coding is executed under a limited computation resource.
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