Application of adaptive digital down-conversion to underwater acoustic communication with nonuniform Doppler shift
Application of adaptive digital down-conversion to underwater acoustic communication with nonuniform Doppler shift
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DOI：
10.35848/1347-4065/ab80db
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发表时间：
2020-04
影响因子：
1.5
通讯作者：
Mitsuyasu Deguchi;Y. Kida;Yoshitaka Watanabe;T. Shimura
中科院分区：
文献类型：
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作者：
Mitsuyasu Deguchi;Y. Kida;Yoshitaka Watanabe;T. Shimura
在水声通信中，非均匀多普勒频移会严重降低解调性能。非均匀多普勒频移引起了非均匀相移和接收时间的变化。在最近的研究中，提出了一种新的处理方法来抑制非均匀时间变化的影响。在本文中，我们从数学上展示了非均匀时间变化如何影响传统解调中的通信，并描述了所提出的处理方法如何对抗时间变化。此外，我们使用仿真来研究所提出的处理如何改善解调性能。仿真在多种运动条件下以不同的符号速率进行。结果清楚地显示了所提出的处理方法的改进，并阐明了新处理方法提高性能的条件。
In underwater acoustic communication, nonuniform Doppler shift can severely degrade demodulation performance. Nonuniform Doppler shift causes nonuniform phase shifts and variation of received time. In recent studies, a new type of processing was proposed to suppress the effects of the nonuniform time variation. In this paper, we show mathematically how the nonuniform time variation affects communication in conventional demodulation, and describe how the proposed processing works against the time variation. Additionally, we use a simulation to investigate how the proposed processing improves demodulation performance. The simulation is carried out under numerous motional conditions at various symbol rates. The results clearly show the improvement by the proposed processing and clarify the conditions under which the new processing improves performance.