Experimental testing of asymmetric underwater acoustic networks

U. Vilaipornsawai, António Silva, S. Jesus
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引用次数: 4

Abstract

The coordinated operation of multiple vehicles within the framework of multipoint non-cabled observatories and offshore activities sprung the necessity for complex underwater acoustic networks (UANs). An example of such UAN consisting of fixed and mobile underwater nodes, was recently developed and tested at sea. A star-shaped network topology was adopted, where wide area network (WAN) integration was ensured through an asymmetric underwater master node composed of an acoustic modem, for low-data-rate downlink from WAN to UAN, and a multiple receiver antenna for single-input-multiple-output (SIMO) high-priority high-data-rate uplink, from UAN to WAN. This paper focuses on the performance of the high-priority SIMO uplink combining multichannel geometry-adapted passive Time Reversal (pTR) and single Decision Feedback Equalizer (DFE) nomenclatureDFEDecision Feedback Equalizer. High data-rate and sustainable communications for mobile and fixed nodes were considered. Two experimental data sets were used: one from the UAN10 sea trial (Pianosa island, Italy, September 2010) for a moving source and UAN11 (Trondheim Fjord area, Norway, May 2011) for a fixed source. BPSK/QPSK signaling, data-rate upto 4000 bps and a source speed upto 0.5 m/s, were considered for carrier frequencies ranging from 5kHz to 25.6kHz. Temporal coherence is shown to be a key factor, determining the performance of pTR-based techniques. Moreover, the geometry-adapted pTR is shown to sustain the temporal coherence in case of geometry changes.
非对称水声网络的实验测试
在多点非电缆观测站和海上活动的框架内,多个车辆的协调操作产生了复杂水声网络(UANs)的必要性。这种由固定和移动水下节点组成的UAN的一个例子最近在海上开发和测试。采用星形网络拓扑结构,通过由声学调制解调器组成的非对称水下主节点,实现广域网(WAN)的集成,实现广域网(WAN)从WAN到UAN的低数据速率下行链路,通过多接收天线实现UAN到WAN的单输入多输出(SIMO)高优先级高数据速率上行链路。本文重点研究了多通道几何自适应被动时间反转(pTR)和单决策反馈均衡器(DFE)相结合的高优先级SIMO上行链路的性能。考虑了移动和固定节点的高数据速率和可持续通信。使用了两个实验数据集:一个来自UAN10海上试验(意大利皮亚诺萨岛,2010年9月),用于移动源,另一个来自UAN11(挪威特隆赫姆峡湾地区,2011年5月),用于固定源。BPSK/QPSK信令,数据速率高达4000bps,源速度高达0.5 m/s,载波频率范围为5kHz至25.6kHz。时间相干性是决定基于ptr技术性能的关键因素。此外,几何适应的pTR在几何变化的情况下可以保持时间相干性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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