NeTS: Small: Towards Real-Time Video Streaming in the Internet of Underwater Things

“水下互联网”的前景引起了公众的极大兴趣，因为它在促进海上许多商业、科学和军事活动方面具有潜力。尽管在过去的几年里，研究界越来越关注水下网络，但水下网络仍处于起步阶段。当前最先进的水声技术可以支持大多数点对点、低数据速率和延迟容忍的应用。该项目试图通过调查两个基本问题来推进水下网络的最新技术水平。首先，它正在开发技术，以比今天更高的传输速率通过短程链路进行通信。第二，它正在开发技术，将新设计的声学通信技术与互联网结合起来，以保证与现有网络的互操作性。新功能将通过重点展示水下监控的视频流应用场景来展示。该项目将把研究和教育结合起来，设立关于声学联网及其应用的交叉列出的研究生/本科生课程，开展活动以接触代表性不足的社区，并开展这一领域的技术转让活动，该项目提出通过开发新的无载波传输和多址技术，改变信息如何通过短距离声学链路传送的模式。短的，适当设计/成形的脉冲在超声频谱制度下传输的自适应跳时模式与叠加的扩展码的可变长度。其效果是几乎无缝的物理/MAC层集成，以及通过适当优化的扩频序列实现最高数据速率通信的潜力。所提出的方法的次要但重要的好处是低成本和重量无干扰传感器和出色的接收机干扰抑制能力。正在通过一个适应层实现与因特网的整合，该适应层通过执行报头压缩、分组分段和创建虚拟公共广播空间，充当较高层协议与水下链路之间的接口。

The prospect of an 'Underwater Internet' has raised significant interest among the general public because of its potential in facilitating many commercial, scientific, and military activities at sea. Still, in spite of the increased attention by the research community in the last few years, underwater networks are still in their infancy. Current state-of-the-art underwater acoustic technology can support mostly point-to-point, low-data-rate, and delay-tolerant applications. This project is attempting to advance the state of the art in underwater networking by investigating two fundamental issues. First, it is developing technology to communicate over short-range links at higher transmission rates than available today. Second, it is developing technology to integrate the newly-designed acoustic communication technology with the Internet to guarantee interoperability with existing networks. The new capabilities will be demonstrated by focusing on video streaming application scenarios for underwater surveillance. The project will integrate research and education by establishing cross-listed graduate/undergraduate courses on acoustic networking and its applications, activities to reach out to underrepresented communities, and pursuit of technology transfer activities in this field.The project proposes a paradigm shift in how information is carried over short-range acoustic links, by developing novel carrierless transmission and multiple access techniques. Short, properly designed/shaped pulses are transmitted in the ultrasonic spectral regime following an adaptive time-hopping pattern with a superimposed spreading code of variable length. The effect is nearly seamless physical/MAC layer integration, and potential for highest data rate communication by properly optimized spreading sequences. Secondary -yet important- benefits of the proposed approach are low cost and weight oscillator-free transducers and excellent receiver interference suppressing capabilities. Integration with the Internet is being pursued by means of an adaptation layer that acts as an interface between higher-layer protocols and the underwater links by performing header compression, packet fragmentation, and creation of a virtual common broadcast space.