Design And Implementation Of Network Coding In Complex Environment

With the development of Internet, Internet has become a part of people’s daily life. The transmission method of the traditional network has obvious shortcomings in the transmission throughput, Different from the method of the traditional routing, Network coding makes the information transmission rate reach the maximum flow of network in multicast communication networks. The birth and the development of network coding point out a new research direction for the network information transmission. Combined with the present theoretical results and practical experience, applying network coding to the existing communication technique to obtain better performance is becoming one of the research hotspots in recent years. However, in the process of practical application, in the face of complex transmitting messages and network environment, there exist few problems that low efficiency rate and hardly controlled decoding rate and so on.For the network coding problem, the thesis analysis the existing network coding scheme in-depth, focusing on researching the existing network encoding scheme to deal with the insufficient of complex environment. For the network coding under unequal lengths messages, we combined with physical layer network coding based MPSK coding scheme and proposed a coding scheme. Compared with traditional schemes, the energy consumption of sending message in this scheme is half of the original scheme and this scheme makes the channel capacity more close to the Shannon entropy limit.For the wireless multi-hop networks, the thesis designs an anonymous network coding scheme that the decoding rate can be controlled in wireless network. The scheme combined with the thought of LT codes and proposed an anonymous reliable encoding scheme. And the scheme can make relay node complete the encoding process without decoding. The scheme implements anonymous communication process and ensures that the probability of decoding can be controlled. And this scheme improves the efficiency of network coding and decoding. The two new network coding schemes that the thesis proposes make the network coding to further improve in application of the technology level.