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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Cell ID and Timing Estimation Techniques for Underwater Acoustic Cellular Systems in High-Doppler Environments
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Cell ID and Timing Estimation Techniques for Underwater Acoustic Cellular Systems in High-Doppler Environments

机译：高多普勒环境中水下声学蜂窝系统的小区ID和定时估计技术

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摘要

In an underwater acoustic cellular (UAC) system, underwater equipment or sensor nodes need to detect the identity of an underwater base station (UBS) and synchronise it with a serving UBS. It is known that, in an underwater acoustic channel, the temporal variability of the ocean coupled with the low speed of sound in water may induce a significant Doppler shift. In this paper, two different types of cell search techniques (CSTs) are proposed to detect the cell ID and correct timing of the UBS in UAC systems with a Doppler shift: CST based on linear frequency modulation with full bandwidth in the time domain (LFM-FT) and CST based on linear frequency modulation in the frequency domain (LFM-FF). The performances (auto-correlation, cross-correlation, ambiguity function, and cross ambiguity function) of the proposed techniques are analysed and compared with simulation results. It is demonstrated by simulation that the proposed techniques perform better than previous techniques in both AWGN and multipath channels when a Doppler shift exists. It is also shown that the LFM-FF-CST achieves the best performance in the presence of a Doppler shift and is suitable for mobile UAC systems.
机译：在水下声学蜂窝（UAC）系统中，水下设备或传感器节点需要检测水下基站（UBS）的身份，并将其与服务UBS同步。众所周知，在水下声沟道中，与水中的低声速度耦合的海洋的时间可变性可能导致显着的多普勒偏移。在本文中，提出了两种不同类型的小区搜索技术（CSTS）来检测UB在UAC系统中的UBS在具有多普勒频移的单元ID和正确定时：CST基于时域中具有全带宽的线性频率调制（LFM -FT）和基于频域（LFM-FF）中的线性频率调制的CST。分析了所提出的技术的性能（自相关，互相关，模糊功能和交叉模糊功能），并与仿真结果进行比较。通过模拟来证明，当存在多普勒频移时，所提出的技术在AWGN和多径信道中执行更好的技术。还表明LFM-FF-CST在多普勒频移的存在下实现了最佳性能，并且适用于移动UAC系统。

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