| The real-time and reliable transmission of video is an important problem in multimedia sensor network. Digital fountain codes, as a kind of erasure code, because of its rateless features, has been becoming an important applications in data transmission. The purpose of this thesis is to study the method of erase code for video transmission in wireless multi-hop network and to implement it.We analyze the functional and performance requirements of video transmission in multimedia sensor network. We also introduce the principle of digital fountain codes and its functional and performance advantages. Particularly, we focus on the coding process and implementation difficulties for the systematic raptor code. In this thesis, we design a video transmission system in wireless multi-hop network. According to the requirements analysis, we put forward the design of function module and workflow. Additionally, we present the detailed implementation process. The system uses the systematic Raptor code as the solution to solve the problem of packet loss in wireless multi-hop network. We finally realize the real-time and reliable transmission of the video data on multiple hops network. Through the experiment and test, as well as the contrast of video transmission result and the analysis of system performance, we verify that the systematic raptor code effectively avoids the packet loss in video data transmission in the multiple hops network and improves the quality of the video transmission. |
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