Collaborative NETS-NECO: Wireless Underwater Multi-tiered Acoustic Networks (WUMAN)

协作 NETS-NECO：无线水下多层声学网络 (WUMAN)

• 批准号: 0832186
• 负责人: Urbashi Mitra
• 金额: $ 25万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0832186&HistoricalAwards=false
• 关键词: Collaborative; NETS; NECO; Wireless; Underwater

Significant advances have been made over the past decade to establish high performance acoustic communication links for many ocean environments. However, there has been limited development on underwater acoustic networks, the fact that is in stark contrast with the terrestrial wireless networks. In an underwater environment, network nodesare neither small nor inexpensive, and the harsh environment renders network deployment difficult. Network design is challenged by the fundamental nature of underwater sound propagation: channel attenuation depends on the distance and signal frequency, resulting in a distance-dependent bandwidth; extensive time-varying multipath causes delay spreads of tens or hundreds of milliseconds, and low speed of sound (1500 m/s) results in severe motion-induced Doppler distortion and extreme channel latency. These facts necessitate dedicated design of communication algorithms and protocols on all network layers, their cross-coupling, as well as careful consideration of the overall system topology and architecture. In the design of underwater wireless networks, the challenge is to exploit, rather than avoid the peculiar effects of acoustic propagation. Towards this goal, emphasis is placed on three areas: architecture design (determining the degree of hierarchy and multi-hopping, and associated algorithms and protocols), system optimization, and resource allocation (power and bandwidth). Currently, no analytical results exist on optimized network deployment; furthermore, system capacity is unknown. Anaytical Results that are based on physical laws of acoustic propagation, and not on radio-like models, are expected to provide useful tools in the design of future networks challenged by high latency and limited resources.

在过去的十年中，已经取得了重大进步，以建立许多海洋环境的高性能声通信联系。但是，水下声学网络的发展有限，这与地面无线网络形成鲜明对比。 在水下环境中，网络nodesare既不小也不便宜，而严峻的环境使网络部署变得困难。网络设计受到水下声音传播的基本性质的挑战：通道衰减取决于距离和信号频率，从而导致距离依赖的带宽；广泛的时变多径会导致数十毫秒或数百毫秒的延迟扩散，低速声音（1500 m/s）导致严重的运动引起的多普勒失真和极端的通道潜伏期。这些事实需要对所有网络层的通信算法和协议进行专门设计，它们的交叉耦合以及仔细考虑整体系统拓扑和体系结构。在水下无线网络的设计中，挑战是利用，而不是避免声学传播的特殊影响。 为了实现这一目标，重点放在三个领域：体系结构设计（确定层次结构和多跳跃的程度以及相关的算法和协议），系统优化以及资源分配（功率和带宽）。 当前，在优化的网络部署上不存在分析结果。此外，系统容量尚不清楚。基于声学传播的物理定律而不是基于单独的模型，预计将提供有用的工具，这些工具将为未来网络的设计提供有用的工具，这些网络受到高潜伏期和有限的资源的挑战。