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Mobile image/video transmission for wireless multimedia communications.

机译：用于无线多媒体通信的移动图像/视频传输。

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摘要

Reliable and efficient image/video transmission presents an extreme challenge in harsh mobile environments. In this thesis, we develop a unique set of techniques, including combined source and channel coding (CSCC) schemes, bursty error countermeasures, and pre/post-processing techniques, to support mobile image/video transmission with substantially improved error resilience capability and transmission efficiency.; Unlike previous work where the bursty nature of errors was often ignored, the proposed CSCC takes both the correlated source characteristics and bursty error structure into account. To study the error structure in wireless channels, a finite state Markov model (FSMM) is developed for representing a correlated fading channel with diversity. A recursive algorithm, based on this model, is then proposed for an efficient estimation of block codes performance, so as to find the best error detection/correction coding design in fading environments. By incorporating the error sensitivities of image/video data, a unique methodology for optimization of CSCC schemes is then obtained.; In addition to CSCC, a low complexity spatial concealment, which is based on multi-directional interpolation, is developed in conjunction with block-shuffling, in order to effectively recover erroneous blocks in image transmission. Further, an H.263-based error resilient video transmission system is proposed with powerful bursty error countermeasures achieved by the use of diversity and CSCC. Robust decoding together with a combined spatial-temporal concealment is employed to mitigate the effects of decoding mis-match caused by residual errors. Meanwhile, an efficient motion estimation algorithm is devised in the encoder as another enabling technique to support low complexity video codec implementation for wireless applications.; For an integrated multimedia system design, we also investigate the performance of combined modulation and diversity in terms of enhanced cellular spectrum efficiency. Useful results are presented, and tradeoffs among spectrum efficiency, power efficiency and implementation complexity are studied.
机译：在恶劣的移动环境中，可靠，高效的图像/视频传输提出了极大的挑战。在本文中，我们开发了一套独特的技术，包括组合的源代码和信道编码（CSCC）方案，突发错误对策以及预处理/后处理技术，以支持移动图像/视频传输，并显着提高了错误恢复能力和传输能力效率。;与以前的工作经常忽略错误的突发性质不同，建议的CSCC同时考虑了相关的源特性和突发错误结构。为了研究无线信道中的错误结构，建立了一个有限状态马尔可夫模型（FSMM）来表示具有分集的相关衰落信道。然后提出一种基于该模型的递归算法，以有效地估计分组码性能，以便在衰落环境中找到最佳的检错/纠错编码设计。通过结合图像/视频数据的错误敏感性，可以得到优化CSCC方案的独特方法。除CSCC之外，还结合块改组开发了基于多方向插值的低复杂度空间隐藏，以有效地恢复图像传输中的错误块。此外，提出了一种基于H.263的容错视频传输系统，该系统具有通过使用分集和CSCC实现的强大的突发错误对策。鲁棒解码与组合的时空隐藏一起用于减轻由残留错误引起的解码不匹配的影响。同时，在编码器中设计了一种有效的运动估计算法作为另一种使能技术，以支持用于无线应用的低复杂度视频编解码器实现。对于集成多媒体系统设计，我们还根据增强的蜂窝频谱效率研究了组合调制和分集的性能。给出了有用的结果，并研究了频谱效率，功率效率和实现复杂性之间的折衷。

著录项

  • 作者

    Lu, Jianhua.;

  • 作者单位

    Hong Kong University of Science and Technology (People's Republic of China).;

  • 授予单位 Hong Kong University of Science and Technology (People's Republic of China).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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