Browsing by Author "Lee, BK"

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Optimal H-infinity prediction algorithm for uncertain non-stationary real-time MPEG VBR traffic
(2002)
Yang, YS
;
Lee, BK
;
Chen, BS
;
Lee, TH
;
交大名義發表
In this paper, a prediction scheme is proposed for real-time MPEG video to predict the burst and long-range dependent traffic. The trend and periodicity characteristics of MPEG video traffic are fully captured by a proposed state-space stochastic dynamic model, which includes traffic parameters in state vector, to improve the accuracy of prediction. As the statistics of the underlying processes are either unavailable or uncertain in real-time applications, a recursive H,,. filtering algorithm is proposed to estimate traffic parameters for long-range prediction. Unlike previous prediction schemes, which predict I, P and B frames separately, the proposed scheme predicts the composite MPEG video traffic. Simulation results based on real MPEG traffic data show that the time-varying trend, the periodic components, and the long-range dependence property can be splendidly predicted and captured by the proposed method. The proposed scheme has a superior performance than the conventional methods, such as LMS, RLS, and TDNN algorithms, in long-range prediction.
Tradeoff between performance and computation for prediction of real-time MPEG video traffic
(2003)
Yang, YS
;
Lee, BK
;
Chen, BS
;
Lee, TH
;
電信工程研究所
The performance issues and computation power consumptions of several prediction algorithms for real-time MPEG video are discussed on the paper. The real time MPEG traffic is most important application on broadband video application both on ATM or IP network. The characteristics of MPEG video traffic is burst, long- range dependent, and non-stationary with trend and periodicity. As the statistics of the underlying processes are either unavailable or uncertain in real-time applications, an effective prediction algorithm is helpful for user equipment to capture the real-time variant traffic. The time-invariant H-2/H-infinity filtering algorithm is suggested to estimate traffic parameters for longrange prediction of the MPEG traffic. Simulation results based on real MPEG traffic data show that the time-varying trend, the periodic components, and the long-range dependence property can be splendidly predicted and captured by the proposed method. Compared with the dine-varying H-infinity filter and the time delay neural network (TDNA), the proposed scheme has the best compromise between prediction performance and computation cost for long range prediction of the MPEG video traffic.