Collaborative Research: FRG: Time Reversal Techniques in Radar and Radio Communications

提案：DMS-0354674 PI：乔治Papanicolaou PI：机构：斯坦福大学标题：合作研究：FRG：无线通信中的时间重传技术摘要这个重点研究小组项目是一个紧密结合的数学-EE合作，除了PI的，还包括几个学生和博士后访问者。我们的目标包括物理信道建模，实验测量，算法设计和大延迟扩展环境中的无线通信系统的仿真。 物理建模将有助于理解无线环境中的大延迟扩展信道。实验测量将使用一个新的，特别是由这个研究小组设计的，无线时间反演探测器，以验证理论时间反演预测。数学算法设计将处理均衡复杂性，处理不完美的信道估计、预编码等，在这些问题中出现的问题。系统仿真将有助于理解时间反转通信在不同部署场景中的整体性能。在时间反转中，使用时间反转滤波器传输的信号在预期接收器附近的时空中反向传播并紧密聚焦。这种现象依赖于大延迟扩展（丰富的多径）信道。当传播介质是随机不均匀的时，时空聚焦甚至更加紧密和鲁棒。最近的实验和理论研究已经牢固地建立了这种显着的效应，并激发了在检测、成像和通信方面的应用。 我们相信，这些时间反转的时空聚焦特性可以导致一类新的无线通信系统，与当前的方法相比具有显着的优势。该技术将无线中由多径（其引起衰落）引起的问题转化为改进性能的机会。这些想法在商业无线以及专用系统中有许多潜在的应用，例如要求低截获概率的通信系统。配套提案：0354658 PI：Liliana Borcea机构：莱斯大学

Proposal: DMS-0354674PI: George PapanicolaouPI: Institution: Stanford UniversityTitle: Collaborative Research: FRG: Time Reversal Techniques in Wireless CommunicationsABSTRACTThis Focused Research Group project is a closely knit Math-EE collaboration that involves, in addition to the PI's, several students and postdoctoral visitors. Our goals cover physical channel modeling, experimental measurements, algorithm design and simulation of wireless communication systems in large delay spread environments. Physical modeling will help understand large delay spread channels in wireless environments. Experimental measurements will use a new, specially designed by this research group, wireless time reversal sounder to verify theoretical time reversal predictions. Mathematical algorithm design will deal with equalization complexity, working with imperfect channel estimates, pre-coding, etc., that arise in such problems. Systems simulations will help understand overall performance of time reversal communications in different deployment scenarios.In time reversal, signals transmitted with a time reversed filter back propagate and focus tightly in space-time near the intended receiver. The phenomena rely on large delay spread (rich multipath) channels. The space-time focusing is even more tight and robust when the propagation medium is randomly inhomogeneous. Recent experimental and theoretical studies have firmly established this remarkable effect and have motivated applications to detection, imaging and communications. We believe that these space-time focusing properties of time reversal can lead to a new class of wireless communications systems with significant advantages over current approaches. This technique converts a problem in wireless posed by multipath (which induces fading) into an opportunity for improved performance. There are many potential applications of these ideas in commercial wireless as well as in specialized systems, such as communication systems that demand low probability of intercept.Companion Proposal: 0354658PI: Liliana BorceaInstitution: Rice University