| In recent years,along with the further development of multi-hop relaying technology,higher requirements of real-time and reliable transmission of remote data is put forward.Relay selection as a key technology impacting on transmission performance of wireless multi-hop networks has become a hot topic.However,how to ensure real-timing and reliability of multimedia data's transmission in restricted channel is still an important issue faced by relay selection.Based on research and analysis of rateless codes and relay selection,aimed at requirements of real-time and reliable data transmission in wireless multi-hop networks,we design and implement a relay selection mechanism based on channel information and decoding information.This mechanism completes the selection of decoding relay in communication system by collecting channel information and decoding information of relay node.We guarantee the reliability of relay transmission by using rateless codes as a reference code for decoding relay,achieve the selection of decoding relay by the comprehensive judgement index combined with channel information and decoding information,and achieve the dynamic adjustment of selection results by acquiring channel information and decoding information in real time.Finally,we implement the video relay transmission system with relay selection mechanism,and verify the effectiveness of the mechanism by comparing and evaluating video transmission effect. |
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