Olen Lee Stokes

Analysis of MPEG-1 transmission through B-ISDN ATM networks

To understand the performance of MPEG-1 videos when transmitted through B-ISDN ATM networks, this paper analyzes an equivalent simulated network. Allocation of network bandwidth is based on equivalent capacity with MMBP inputs providing background traffic. Cell losses are examined and found to be near target. Also, an analysis of cell delay indicates that delay distributions can be approximated by gamma distributions and that frame-to-frame cell delay is uncorrelated for the test network. Finally, a method to predict MPEG-1 decode buffer underruns is developed and validated.

Development of a MPEG data stream characterization for use with ATM networks

The various parameters which affect MPEG data streams are discussed. An AR model is developed to characterize both constant bit rate and variable bit rate videos. Three videos with different bit rate modes, audio content, frame type mixture, and group of pictures sizes are analyzed. The accuracy of the AR model in predicting the size of the next frame based on previous frames is examined. Possible enhancements to the AR model are also introduced. The role of the AR model in the development of ATM networks is discussed.