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

提案：DMS-0354674PI：George PapanicolaouPI：机构：斯坦福大学标题：协作研究：FRG：无线通信中的时间反转技术摘要这个重点研究小组项目是一个紧密联系的Math-EE合作项目，除了PI，还包括几名学生和博士后访问者。我们的目标包括大时延扩展环境下的无线通信系统的物理信道建模、实验测量、算法设计和仿真。物理建模将有助于理解无线环境中的大延迟扩展信道。实验测量将使用该研究小组专门设计的一种新的无线时间反转探测仪来验证理论上的时间反转预测。数学算法设计将处理均衡复杂性，处理在此类问题中出现的不完美的信道估计、预编码等。系统仿真将有助于了解不同部署场景下时间反转通信的整体性能，在时间反转中，经过时反滤波后向传输的信号在目标接收端附近的时空中紧密传播和聚焦。这种现象依赖于大延迟扩展(富多径)信道。当传播介质随机不均匀时，时空聚焦更加紧密和稳健。最近的实验和理论研究已经确定了这一显著的效应，并推动了其在探测、成像和通信方面的应用。我们相信，时间反转的这些时空聚焦特性可以导致一类新的无线通信系统，与现有的方法相比具有显着的优势。该技术将无线中多径引起的问题(会导致衰落)转化为提高性能的机会。这些想法在商业无线以及专业系统中有许多潜在的应用，例如需要低截获概率的通信系统。

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