Estimation of LRD present in H.264 video traces using wavelet analysis and proving the paramount of H.264 using OPF technique in wi-fi environment.

摘要

While there has always been a tremendous demand for streaming video overudWireless networks, the nature of the application still presents some challengingudissues. These applications that transmit coded video sequence data over best-effortudnetworks like the Internet, the application must cope with the changing networkudbehaviour; especially, the source encoder rate should be controlled based onudfeedback from a channel estimator that explores the network intermittently. Theudarrival of powerful video compression techniques such as H.264, which advance inudnetworking and telecommunications, opened up a whole new frontier for multimediaudcommunications. The aim of this research is to transmit the H.264 coded videoudframes in the wireless network with maximum reliability and in a very efficientudmanner. When the H.264 encoded video sequences are to be transmitted throughudwireless network, it faces major difficulties in reaching the destination. Theudcharacteristics of H.264 video coded sequences are studied fully and their capabilityudof transmitting in wireless networks are examined and a new approach calledudOptimal Packet Fragmentation (OPF) is framed and the H.264 coded sequences areudtested in the wireless simulated environment. This research has three major studiesudinvolved in it. First part of the research has the study about Long Range Dependenceud(LRD) and the ways by which the self-similarity can be estimated. For estimating theudLRD a few studies are carried out and Wavelet-based estimator is selected for theudresearch because Wavelets incarcerate both time and frequency features in the dataudand regularly provides a more affluent picture than the classical Fourier analysis.udThe Wavelet used to estimate the self-similarity by using the variable called HurstudParameter. Hurst Parameter tells the researcher about how a data can behave inside the transmitted network. This Hurst Parameter should be calculated for a moreudreliable transmission in the wireless network. The second part of the research dealsudwith MPEG-4 and H.264 encoder. The study is carried out to prove which encoder isudsuperior to the other. We need to know which encoder can provide excellent Qualityudof Service (QoS) and reliability. This study proves with the help of Hurst parameterudthat H.264 is superior to MPEG-4. The third part of the study is the vital part in thisudresearch; it deals with the H.264 video coded frames that are segmented into optimaludpacket size in the MAC Layer for an efficient and more reliable transfer in theudwireless network. Finally the H.264 encoded video frames incorporated with theudOptimal Packet Fragmentation are tested in the NS-2 wireless simulated network.udThe research proves the superiority of H.264 video encoder and OPF¿s master class.