SGER: Exploiting Motion in Wireless Networks

本项目主要研究无线系统的跨层设计，包括网络协议层、数据链路层和物理链路层。传统上被视为障碍的移动性可用于改进无线频谱的使用。在多载波码分多址系统中，通过向传输信号添加结构和利用节点的不同多普勒频移，可以获得显著的性能增益。在较低的三个协议层之间的反馈提供了利用由移动无线用户的运动产生的频率移位的机会，从而减轻干扰的影响并增加有效利用。知识价值。本项目介绍了一种利用运动作为无线系统附加参数的新方法。通过利用OFDM中的频率子带，并在传输信号中加入足够的结构进行处理，可以使用多普勒频移来减少干扰的影响。调查人员的初步工作表明，这种处理方法是可行的。运动的使用要求以集成的方式设计物理、数据链路和网络层协议，并假设计算和位置感知能力将继续改进。利用接收信号之间的时序关系进行干扰去除，这也需要跨层信息，也是一种越来越可行的方法。更广泛的影响。本项目开始研究利用运动作为优化无线频谱的可能有利因素。利用运动而不是补偿运动的潜在好处是非常重要的。这类似于近年来获得如此突出的MIMO技术，因为以前被认为对性能有害的因素被转化为积极因素。利用运动需要跨层方法，因为有关运动的信息需要传递到较低的层，以增强这些层的处理。这项研究将有助于理解跨层集成设计的好处。此外，这项工作将通过项目计划中包含的学生职位支持研究生教育进入跨层技术。

This project focuses on the cross-layer design of wireless systems, at the network protocol, data link, and physical link layers. Mobility, which has traditionally been viewed as an impediment, can be utilized to improve the use of wireless spectrum. Significant gains in performance can be achieved by adding structure to transmitted signals and exploiting the different Doppler shifts of nodes in multi-carrier code-division multiple-access systems. Feedback among the lower three protocol layers offers the opportunity to utilize the frequency shifts that result from the motion of mobile wireless users, thereby alleviating effects of interference and increasing effective utilization. Intellectual Merit. This project introduces a novel way to exploit motion as an additional parameter in wireless systems. By utilizing frequency subbands as in OFDM and adding sufficient structure to transmitted signals for processing, Doppler frequency shifts can be used to reduce the effects of interference. Initial work by the investigators suggests the processing is feasible. The use of motion requires that the physical, data link, and network layer protocols be designed in an integrated fashion, and assumes that computing and location-awareness capabilities will continue to improve. The use of timing relationships between received signals for interference excision, which also requires cross-layer information, is also an increasingly feasible approach. Broader Impacts. This project initiates research into utilization of motion as a possibly beneficial factor in the optimization of wireless spectrum. The potential benefits of exploiting motion, instead of compensating for it, are very significant. This is analogous to the MIMO techniques that have gained such prominence in recent years, in that factors that were previously believed to be detrimental to performance are transformed into positives. Exploiting motion requires a cross-layer approach, as information on movement needs to be passed to lower layers to enhance processing at those layers. This research will help to understand the benefits of integrated design across layers. Further, this work will support graduate education into cross-layer techniques through the student positions included in the project plan.