Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China.
Key Laboratory of Marine Information Acquisition and Security, Harbin Engineering University, Ministry of Industry and Information Technology, Harbin 150001, China.
Sensors (Basel). 2018 Sep 29;18(10):3279. doi: 10.3390/s18103279.
Due to the significant multipath and Doppler effects in the underwater acoustic (UWA) channel, the quality of the received signal is degraded, which seriously affects the performance of UWA communication. The paper proposes a time reversal UWA communication method combined with a symbol-based Doppler compensation (SBDC) technique to solve those problems. A single element time reversal mirror (TRM) is used to realize channel equalization and mitigate the inter-symbol interference (ISI) resulting from multipath propagation. The SBDC technique is subsequently used to compensate Doppler effects in the received signal, thereby reducing the bit error rate (BER) and improving the communication performance. In order to verify the performance of the proposed communication method, some simulations with real sounding channels were performed. Moreover, a field UWA communication experiment was conducted in the Songhua River (Harbin, China). The UWA communication experiment achieves nearly error-free performance with a communication rate of 100 bit/s in the bandwidth of 2 kHz. The results of the experiment demonstrate the feasibility and robustness of the proposed UWA communication method.
由于水下声（UWA）信道中存在显著的多径和多普勒效应，接收信号的质量会下降，严重影响 UWA 通信的性能。本文提出了一种结合基于符号的多普勒补偿（SBDC）技术的时反 UWA 通信方法来解决这些问题。使用单个元件时反镜（TRM）来实现信道均衡，并减轻多径传播引起的符号间干扰（ISI）。随后使用 SBDC 技术来补偿接收信号中的多普勒效应，从而降低误码率（BER）并提高通信性能。为了验证所提出的通信方法的性能，进行了一些使用真实探测信道的仿真。此外，还在中国松花江（哈尔滨）进行了现场 UWA 通信实验。UWA 通信实验在带宽为 2 kHz 的情况下以 100 位/秒的通信速率实现了近乎无差错的性能。实验结果证明了所提出的 UWA 通信方法的可行性和鲁棒性。
