Research On Differential Data Transmission Algorithms Based On Instantly Decodable Network Coding

With the development of computer and mobile communication technology,mobile terminal devices are developing vigorously,and the terminal services are mainly multimedia information services.Therefore,in view of the increasing total amount of multimedia mobile data,the increasing gap in the processing capacity of terminal devices and the differences in the quality of wireless links,it is of great significance to study how to efficiently realize the differential transmission of terminal data for providing better quality of service to mobile users.Firstly,this thesis introduces the theoretical knowledge and basic principles of time-domain scalability,network coding and instantly decodable network coding in H.264/SVC standard,and then explains how to apply them to differential data transmission according to their technical characteristics.Subsequently,considering the difference of terminal data and link quality in differentiated wireless broadcasting networks with multiple data sources,this thesis designs a maximum adjacency probability clique algorithm based on coded packets by analyzing the potential coding opportunities of coded packets.The algorithm regards the encoding packet as a general data packet and repeats encoding and decoding each time when choosing the data packet scheduling.At the same time,considering the factors such as channel quality and vertex adjacency degree,it defines the weight and iteratively chooses the group with the largest weight,so as to improve the transmission efficiency of wireless data l and realize the efficient reception of receiving terminals for their respective data.Finally,a heuristic maximum weight clique algorithm based on expanding window is designed for real-time video streaming differentiated broadcasting networks with single data source,considering the differences of terminal processing capacity and link quality.This algorithm takes into account the decoding sequence characteristics,channel quality differences and deadlines of the video stream encoded by SVC.It can increase the percentage of terminal nodes that receive the required data successfully,thus realizing efficient differential transmission of real-time video streams,that is,different terminals can receive data streams of different qualities efficiently.