CIF: Medium: Collaborative Research: Distributed coherence: fundamental building blocks, system concepts, and experimental demonstration

CIF：媒介：协作研究：分布式一致性：基本构建块、系统概念和实验演示

• 批准号: 1302456
• 负责人: Soura Dasgupta
• 金额: $ 50.52万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1302456&HistoricalAwards=false
• 关键词: CIF; Medium; Collaborative; Research; Distributed

Over the past two decades, advances in multi-antenna wireless systems have opened up the possibility of tremendous increases in wireless communication throughputs. The practical realization of these increases in real-world wireless networks is constrained by size and cost considerations that limit the number of antennas, especially for mobile devices. This research aims to achieve the gains from multi-antenna techniques in a distributed fashion by having groups of wireless transceivers pool together and cooperatively act like a virtual antenna array. The concept of virtual arrays has broad transformative potential for wireless networks by extending the numerous benefits of multi-antenna systems to networks of single-antenna devices. We will prototype and demonstrate virtual array techniques experimentally on a software-defined radio platform, and we plan to share our implementations as reusable building blocks to stimulate technology transition and to promote interactions between the academic, open-source software community and radio hobbyist communities. The elements of a virtual array have an unknown, typically time-varying, geometry and are driven by independent oscillators, each with stochastic drift; the main technical challenge is in maintaining distributed coherence in the array in the presence of these effects. While this is a very challenging problem, recent results have demonstrated the feasibility of virtual arrays.This research will establish a solid theoretical foundation for distributed coherence and chart a clear path to technology transfer by applying the theory and techniques to the cross-layer design of concept systems based on virtual antenna arrays. Specifically we will develop a state space framework for tracking and prediction of oscillator dynamics and mobility, and scalable architectures for distributed transmission and reception appropriate for large distributed arrays of low-cost single-antenna devices. We will also identify fundamental tradeoffs and scaling laws for virtual arrays. We will apply and integrate the theory and techniques to two concept systems of great societal significance: Distributed base station provides multi-antenna capabilities even for low carrier frequencies where standard antenna arrays would be too bulky (e.g., white space frequencies). Distributed 911, enables a cluster of nodes to communicate with a possibly moving distant rescue vehicle which would be out of range for any one of the nodes. Our goal is to perform design and performance evaluation in sufficient detail to clear conceptual hurdles for implementation.

在过去的二十年中，多天线无线系统的进步为无线通信吞吐量的大幅增加提供了可能性。现实世界无线网络中这些增加的实际实现受到尺寸和成本考虑的限制，这些因素限制了天线的数量，特别是对于移动设备而言。本研究旨在通过将无线收发器组集中在一起并像虚拟天线阵列一样协作，以分布式方式实现多天线技术的增益。虚拟阵列的概念通过将多天线系统的众多优势扩展到单天线设备网络，对无线网络具有广泛的变革潜力。我们将在软件定义的无线电平台上进行虚拟阵列技术的原型设计和实验演示，并计划将我们的实现作为可重复使用的构建块来共享，以刺激技术转型并促进学术界、开源软件社区和无线电爱好者社区之间的互动。虚拟阵列的元素具有未知的、通常随时间变化的几何形状，并由独立的振荡器驱动，每个振荡器都具有随机漂移；主要的技术挑战是在存在这些效应的情况下保持阵列的分布式一致性。虽然这是一个非常具有挑战性的问题，但最近的结果证明了虚拟阵列的可行性。这项研究将为分布式相干性奠定坚实的理论基础，并通过将理论和技术应用于虚拟阵列的跨层设计，为技术转移制定清晰的路径。基于虚拟天线阵列的概念系统。具体来说，我们将开发一个用于跟踪和预测振荡器动态和移动性的状态空间框架，以及适用于低成本单天线设备的大型分布式阵列的分布式传输和接收的可扩展架构。我们还将确定虚拟阵列的基本权衡和扩展法则。我们将把理论和技术应用和集成到两个具有重大社会意义的概念系统中：分布式基站即使在标准天线阵列过于庞大的低载波频率（例如空白频率）下也能提供多天线能力。分布式 911 使节点集群能够与可能移动的远距离救援车辆进行通信，该救援车辆可能超出任何一个节点的范围。我们的目标是足够详细地进行设计和性能评估，以清除实施的概念障碍。