Experimental assessment of different receiver structures for underwater acoustic communications over multipath channels.

Experimental assessment of different receiver structures for underwater acoustic communications over multipath channels.
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DOI:
10.3390/s120202118
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发表时间:
2012
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Dong H
Dong H
中科院分区:
其他
文献类型:
--
作者:
Zhang G;Hovem JM;Dong H

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水下通信信道往往是复杂的,特别是多径传播可能会导致符号间干扰(ISI)。本文讨论了如何消除ISI,并评估了三种不同的接收机结构及其实现的性能。使用在高频(10-14 kHz)现场实验中收集的真实的数据,通过离线数据处理来评估接收器结构。这三种结构是多通道判决反馈均衡器(DFE),被动时间反转接收机(被动相位共轭(PPC)与单通道DFE),和联合PPC与多通道DFE。在稀疏信道中,主要到达代表信道信息,并且匹配追踪(MP)算法,利用信道的稀疏性已被研究用于PPC处理。在评估中,发现:(1)使用自适应多信道合并方案获得空间增益是有利的;以及(2)MP算法改善了使用PPC处理的通信的性能。
Underwater communication channels are often complicated, and in particular multipath propagation may cause intersymbol interference (ISI). This paper addresses how to remove ISI, and evaluates the performance of three different receiver structures and their implementations. Using real data collected in a high-frequency (10–14 kHz) field experiment, the receiver structures are evaluated by off-line data processing. The three structures are multichannel decision feedback equalizer (DFE), passive time reversal receiver (passive-phase conjugation (PPC) with a single channel DFE), and the joint PPC with multichannel DFE. In sparse channels, dominant arrivals represent the channel information, and the matching pursuit (MP) algorithm which exploits the channel sparseness has been investigated for PPC processing. In the assessment, it is found that: (1) it is advantageous to obtain spatial gain using the adaptive multichannel combining scheme; and (2) the MP algorithm improves the performance of communications using PPC processing.
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