Underwater cooperative MIMO communications using hybrid acoustic and magnetic induction technique
Underwater cooperative MIMO communications using hybrid acoustic and magnetic induction technique
复制标题
DOI：
10.1016/j.comnet.2020.107191
复制
发表时间：
2020-05-22
影响因子：
5.6
通讯作者：
Sun, Zhi
中科院分区：
文献类型：
--
作者：
Li, Zhangyu;Desai, Soham;Sun, Zhi
未来的智能海洋应用需要连接水下传感器/机器人和远程基站的可靠通信网络，由于水下信道的恶劣和动态，这是具有挑战性的。虽然多输入多输出（MIMO）声学技术可以解决这个问题，但由于波长较大，很难在单个设备上放置多个传感器。虽然协作MIMO技术可以解决这个问题，它是不可能的，由于声波的传播延迟极大的动态分布的发射机同步。本文提出了一种基于声磁混合感应技术的水下协作MIMO通信机制。利用MI技术可以解决节点间的同步问题，使分布式传感器可以协作形成窄波束进行远距离通信。由于MI具有可忽略的传播延迟，同步时间和误差显著减少。为了定量分析改进，严格推导出所提出的系统的同步误差、信噪比（SNR）、有效通信时间和吞吐量的封闭形式。所提出的系统是在一个软件定义的测试平台下实现的波束成形和空时编码方案。通过数值和实验分析，我们的混合协作MIMO机制可以实现更低的误码率和同步误差比传统的声学MIMO系统。
Future smart ocean applications require reliable communication networks connecting underwater sensors/robots and remote base stations, which is challenging to achieve due to the harsh and dynamic underwater channels. While Multiple-Input and Multiple-Output (MIMO) acoustic technique can address this problem, it is difficult to place multiple transducers on a single device due to the large wavelength. Although the cooperative MIMO technique could solve this issue, it was impossible to synchronize the distributed transmitters due to the extremely large and dynamic propagation delay of acoustic waves. In this paper, we propose an underwater cooperative MIMO communication mechanism, which is based on a hybrid acoustic and Magnetic Induction (MI) technique. The inter-node synchronization problem can be solved by using the MI technique so that the distributed transducers can cooperatively form narrow beams for long distance communications. The synchronization time and errors are significantly reduced since MI has negligible propagation delays. To quantitatively analyze the improvement, the closed-form of the synchronization error, signal-to-noise ratio (SNR), effective communication time, and throughput of the proposed system are rigorously derived. The proposed system is implemented in a software-defined testbed under the beamforming and space-time coding scheme. Through both numerical and experimental analysis, our hybrid cooperative MIMO mechanism can achieve much lower bit error rate and synchronization error than the conventional acoustic MIMO systems.