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Design and analysis of a high-rate acoustic link for underwater video transmission

机译:水下视频传输高速声链路的设计与分析

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摘要

A high bit rate acoustic link for underwater video transmission is examined. Currently, encoding standards support video transmission at bit rates as low as 64 kbps. While this rate is still above the limit of commercially available acoustic modems, prototype acoustic modems based on phase coherent modulation/detection have demonstrated successful transmission at 30 kbps over a deep water channel. The key to bridging the remaining gap between the bit-rate needed for video transmission and that supported by the acoustic channel lies in two approaches: use of efficient image/video compression algorithms and use of high-level bandwidth-efficient modulation methods. An experimental system, based on discrete cosine transform (DCT) and Huffman entropy coding for image compression, and variable rate M-ary quadrature amplitude modulation (QAM) was implemented. Phase-coherent equalization is accomplished by joint operation of a decision feedback equalizer (DFE) and a second order phase locked loop (PLL). System performance is demonstrated experimentally, using transmission rate of 25000 symbols/sec at a carrier frequency of 75 kHz over a 10 m vertical path.
机译:检查了用于水下视频传输的高比特率声链路。当前,编码标准以低至64 kbps的比特率支持视频传输。尽管此速率仍高于市售声波调制解调器的极限,但基于相位相干调制/检测的原型声波调制解调器已证明在深水通道上以30 kbps的速率成功传输。弥合视频传输所需的比特率和声信道支持的比特率之间的剩余差距的关键在于两种方法:使用有效的图像/视频压缩算法和使用高级带宽高效的调制方法。基于离散余弦变换(DCT)和霍夫曼熵编码进行图像压缩,并采用可变速率多进制正交幅度调制(QAM)的实验系统。通过决策反馈均衡器(DFE)和二阶锁相环(PLL)的联合操作来实现相位相干均衡。通过在10 m垂直路径上以75 kHz的载波频率使用25000个符号/秒的传输速率,通过实验证明了系统性能。

著录项

  • 作者

    Pelekanakis Konstantinos;

  • 作者单位
  • 年度 2004
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  • 原文格式 PDF
  • 正文语种 eng
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