基于ofdm的水声通信系统时间同步方法

2016 International Conference on Advanced Technologies for Communications (ATC) Pub Date : 2016-10-01 DOI:10.1109/ATC.2016.7764760

Dinh Hung Do, Quoc Khuong Nguyen, Do Viet Ha, N. Duc

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引用次数: 11

摘要

由于环境噪声对UWA信道的影响较大，且UWA信道具有较大的多普勒频移，因此UWA- ofdm系统的时间同步是一个具有挑战性的问题。此外，UWA通信系统的信号带宽非常有限。因此，优化系统的带宽效率也是设计UWA通信同步方法的重要目标。为了解决上述问题，提高系统的频谱效率，本文提出了一种基于ofdm的水声通信系统的时间同步方法。我们只使用保护间隔(GI)来进行时间同步，而不使用前导。因此，所建议的方法不需要额外的同步冗余。实验和仿真结果表明，所提出的时间同步方法优于一些传统的UWA通信算法。

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A time synchronization method for OFDM-based underwater acoustic communication systems

Due to the strong influence of the ambient noise and the time variation of underwater acoustic (UWA) channels with a large Doppler frequency shift, the time synchronization is a challenging issue in UWA-OFDM systems. In addition, the signal bandwidth of UWA communication systems is very limited. Thus, optimizing the bandwidth efficiency of the system is also an important target in designing synchronization methods for UWA communications. For combating the above-mentioned problems as well as to increase the spectrum efficiency of the system, this paper proposes a time synchronization method for OFDM-based underwater acoustic communication systems. Instead of the using preamble, we use only the guard interval (GI) for the time synchronization. Hence, there is no additional redundancy for synchronization that is requested for the proposed method. Experimental and simulation results show that the proposed time synchronization method outperforms some conventional algorithms used for UWA communication systems.

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2016 International Conference on Advanced Technologies for Communications (ATC)

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