The GBAR source model for VBR videoconferences
- 1 January 1997
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE/ACM Transactions on Networking
- Vol. 5 (4) , 554-560
- https://doi.org/10.1109/90.649513
Abstract
A previous study examined three sequences giving the number of cells per frame of a VBR encoding of videoconfer- ences (talking heads); these sequences were produced by hard- ware encoders using different coding algorithms. Each sequence had a gamma marginal distribution, and the autocorrelation function was geometric up to lags of at least 3 s, which includes all autocorrelation values larger than 0.1. We present an easy to simulate autoregressive process that has these properties. The model is tested by comparing the cell-loss rate produced when the data trace was used as the sole source in a simulation of an ATM switch to the cell-loss rates produced when traces generated by the model were used as the source.Keywords
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