Collaborative Research: Physical Dynamics Aware Coding for Communications in Cyber Physical Systems: Analysis, Algorithms and Implementation

协作研究：网络物理系统中通信的物理动力学感知编码：分析、算法和实现

• 批准号: 1407679
• 负责人: Husheng Li
• 金额: $ 20万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1407679&HistoricalAwards=false
• 关键词: Collaborative; Research; Physical; Dynamics; Aware

In recent years, there have been substantial researches on cyber physical systems. A typical cyber physical system is composed of both physical and cyber parts. The physical part refers to the dynamics ruled by physical laws, while the cyber part (which consists of sensor(s), communication and controller(s)) observes the physical dynamics, transmits the reports, and makes control actions. Many practical applications can be considered as cyber physical systems, such as smart grids, unmanned aerial vehicles, and robotic networks. The communication part plays a key role in CPS since it conveys information from the sensor(s) to the controller(s), similarly to the nerve system of human body. When facing negative environments, source and channel coding schemes can improve the efficiency and reliability of the communication system. Traditional coding schemes are designed for pure data communications and are inefficient for controlling the physical dynamics in cyber physical systems. This project studies how to integrate the awareness of physical dynamics status into the source and channel coding procedures, which improves the performance of the operation of physical dynamics. This context awareness brings a paradigm shift to the design and analysis of cyber physical systems and benefits many future systems such as smart grids. The project is extended to education purposes, including K-12 outreach, and undergraduate/graduate level course designs. The achievements of the proposed research are disseminated to academia and industry communities.This project analyzes and develops new coding schemes in the physical layer of communication for CPS, which imposes significantly different design requirements than that of the traditional networks. In particular, the project designs the coding schemes with the awareness of the physical dynamics characteristics, instead of separated designs of communications and controls. The first task is to designs new joint/iterative channel decoding and state estimation schemes that are aware of the inherent temporal/spatial redundancies in the physical dynamics observations. It begins from simple block codes and extends the work to complicated codes with cycles. Distributed source coding at the sensors is designed, which also takes the spatial and temporal redundancies into account. In particular, the criteria of source coding (e.g., the distortion) are made aware of the objectives of controlling the physical dynamics. The proposed source and channel coding schemes are evaluated in the context of smart grid monitoring and control. Both co-simulation software and hardware testbeds are implemented for the performance evaluation.

近年来，已经进行了有关网络物理系统的大量研究。典型的网络物理系统由物理和网络部件组成。物理部分是指由物理定律统治的动力学，而网络部分（由传感器，通信和控制器组成）观察物理动力学，传输报告并做出控制动作。许多实际应用可以被视为网络物理系统，例如智能电网，无人机和机器人网络。通信部分在CPS中起着关键作用，因为它将信息从传感器传达到控制器，与人体的神经系统类似。当面对负面环境时，源和渠道编码方案可以提高通信系统的效率和可靠性。传统的编码方案专为纯数据通信而设计，并且无法控制网络物理系统中的物理动态。该项目研究了如何将物理动态状态的认识整合到源和频道编码过程中，从而改善了物理动力的运行性能。这种环境意识将范式转移到网络物理系统的设计和分析，并使许多未来的系统（例如智能电网）受益。 该项目扩展到教育目的，包括K-12外展和本科/研究生级课程设计。拟议研究的成就被传播到学术界和行业社区。该项目分析并制定了CPS物理通信的新编码方案，该计划与传统网络的设计要求施加了明显不同的设计要求。特别是，该项目以意识到物理动态特征的意识设计了编码方案，而不是分离的通信和控制设计。第一个任务是设计新的关节/迭代通道解码和状态估计方案，这些方案意识到物理动力学观察中固有的时间/空间冗余。它从简单的块代码开始，并将工作扩展到带有周期的复杂代码。在传感器上设计了分布式源编码，这还考虑了空间和时间冗余。特别是，源编码的标准（例如，失真）意识到控制物理动态的目标。在智能电网监视和控制的背景下，评估了所提出的源和通道编码方案。共同模拟软件和硬件测试台均用于性能评估。