| VBR视频流在有服务质量(QoS)保证的信道上传输时的最优控制问题 |
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| 引用本文： | 李春文,朱鹏.VBR视频流在有服务质量(QoS)保证的信道上传输时的最优控制问题[J].自动化学报,2007,33(1):32-36. |
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| 作者姓名： | 李春文 朱鹏 |
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| 作者单位： | 1.清华大学自动化系 北京 100084 |
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| 摘 要： | 本文讨论了可变比特率（VBR）视频流在有服务质量(QoS)保证的信道上传输时的信源和信道速率控制问题.首先将其表述为离散线性时延系统的最优控制问题，然后利用离散极大值原理得到该问题的最优解.和传统的解决方案相比较，本文的方法适合于具有连续输出码率的编码器，并对于编码器和解码器的缓冲区大小没有特殊要求，理论分析和实验结果表明，本文的方法具有更低的复杂度.该方法既能用于离线编码，也能用于在线编码.
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| 关 键 词： | 最优控制 离散线性时延系统 极大值原理 VBR视频流 服务质量 |
| 收稿时间： | 2005-06-07 |
| 修稿时间： | 2006-05-30 |
Optimal Rate Control for Transporting VBR Video over QoS-assured Channels |
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| LI Chun-Wen,ZHU Peng.Optimal Rate Control for Transporting VBR Video over QoS-assured Channels[J].Acta Automatica Sinica,2007,33(1):32-36. |
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| Authors: | LI Chun-Wen ZHU Peng |
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| Affiliation: | 1.Department of Automation, Tsinghua University, Beijing 100084, P. R. China; |
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| Abstract: | In this paper we discuss how to select appropriate source and channel rate for transporting variable bit-rate (VBR) compressed video over QoS (quality of service)-assured channels. We first formulate it as an optimal control problem of discrete linear time-delay system. Then the discrete maximum principle is used to get the optimal control. Compared to traditional solutions, the proposed algorithm is designed for the coder with continuous output rate, and can work without special requirements for the encoder and decoder buffer sizes. Theoretical analysis and experimental results show that the proposed algorithm has lower space and time complexity. Our solution can be used in both off-line and on-line coding. |
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| Keywords: | Optimal control discrete linear time-delay system maximum principle VBR video QoS |
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