A Real- Time Software- Defined Acoustic Modem Based on USRP for Underwater Communications

Global Oceans 2020: Singapore – U.S. Gulf Coast Pub Date : 2020-10-05 DOI:10.1109/IEEECONF38699.2020.9389342

Mengya Wang, Deqing Wang, Haiyu Li, Liqun Fu

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Abstract

A reconfigurable software-defined acoustic modem (SDAM) allows the researchers concentrate on algorithmic developments, especially in the field of underwater communications featured with temporally and spatially varying channels. In this paper, we develop a real-time SDAM prototype based on Universal Software Radio Peripheral (USRP) for underwater communications. However, several hardware and software challenges, including hardware matching, special programming mechanism and fine frame synchronization, should be investigated for the real-time SDAM. We tackle these challenges and present the corresponding solutions. An oversampled baseband Orthogonal Frequency Division Multiplexing (OFDM) is presented to match the hardware requirements of USRP, and then a unique control signaling mechanism adaptive to underwater signal processing flow is developed. For real-time implementations, a fine frame synchronization method is adopted to cope with significant fading. Experimental results show that the newly developed SDAM prototype is reliable for real-time underwater communications with severe multipath environments.

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基于USRP的水下通信实时软件定义声调制解调器

可重构的软件定义声学调制解调器(SDAM)使研究人员能够专注于算法开发，特别是在具有时间和空间变化信道的水下通信领域。在本文中，我们开发了一个基于通用软件无线电外设(USRP)的水下通信实时SDAM原型。然而，实时SDAM需要研究硬件匹配、特殊编程机制和精细帧同步等硬件和软件难题。我们应对这些挑战，并提出相应的解决方案。针对USRP的硬件要求，提出了一种过采样基带正交频分复用(OFDM)技术，并在此基础上提出了一种独特的适应水下信号处理流程的控制信令机制。在实时实现中，采用了精细帧同步方法来应对明显的衰落。实验结果表明，新研制的SDAM原型机在恶劣多径环境下的水下实时通信是可靠的。

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Global Oceans 2020: Singapore – U.S. Gulf Coast

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