An Experimental Testbed for Research in Advanced Wireless Communications

先进无线通信研究的实验测试台

• 批准号: 9809018
• 负责人: Michael Fitz
• 金额: $ 146.02万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9809018&HistoricalAwards=false
• 关键词: Experimental; Testbed; Research; Advanced; Wireless

The demand for wireless services has experienced explosive growth in recent years with no signs of abatement. Much of the remaining potential gains in wireless communications inherently require the synergy of both theoretical and experimental methods. The objective of this project is to achieve significant gains in wireless system performance and spectral efficiency through a tight, synergistic theory-experiment loop. The research objectives of the seven proposed focus areas are summarized below:Wireless Testbed: An existing and functioning wireless testbed will be leveraged to build an experimental system which forms the bedrock of the proposed research. This flexible design permits operation at multiple frequencies, with multiple bandwidth and array capabilities.Multiple Access Signaling: Advanced multi-user receivers will be designed by considering novel characterizations of multiple access interference, inherent parameter mismatch, and systems that offer multiple data rates. Coupled model order selection/parameter estimation techniques will be employed to optimally characterizecand mitigate interference.Space-Time Modems: Traditional models for space-time characteristics will be validated via field tests. Experimentally refined models will be used to optimize space-time codes. Both coupled and decoupled space-time processing algorithms will be developed to perform multi-user separation and channel equalization for multiple data rate systems.Error Control: An interactive/iterative design process between physical layer system design and network layer protocol design will be employed to efficiently distribute system complexity. To this end, experimental error statistics will be characterized and error statistic shaping methods will be developed. For given error statistics, optimal protocols will be designed and analyzed.Access Methods: Based on the error characteristics drawn from experimental data, we will design medium access control protocols to support timely establishment of message streams and to support different levels of temporal QoS in the presence of channel errors and fading.Mobility: The testbed will be used to study how the channel error and fading characteristics of wireless links impact the design of a robust handoff mechanism and how error characteristics can be shaped and tuned to facilitate the design.Flow Control: Flow control is an important resource management problem for reliable data transmission, especially in a high demand situation. A stable, robust, adaptive controller design scheme will be developed for a class of time-varying, time-delay system models appearing in basic flow control problems of communication networks.This research project addresses several of the priorities established by the NSF for sponsored research programs. The project has been designed to be collaborative and interdisciplinary and each problem has been specifically chosen to take advantage of existing and proven expertise of the OSU team. Additionally, successful achievement of the research objectives necessitates the merging of theoretical and experimental activity. The project leverages existing facilities, but will also improve the infrastructure for future research and educational endeavors. Graduate student training will play a major role in the execution of the proposed research and the unique dual theoretical and experimental nature of the work will offer an enriched educational environment.

近年来，对无线服务的需求经历了爆炸式增长，而且没有减弱的迹象。无线通信中剩余的许多潜在增益本质上需要理论和实验方法的协同作用。本项目的目标是通过紧密的、协同的理论-实验循环来实现无线系统性能和频谱效率的显著增益。 七个拟议重点领域的研究目标概述如下：无线测试平台：将利用现有的和功能正常的无线测试平台来建立一个实验系统，该系统构成拟议研究的基础。这种灵活的设计允许在多个频率，多个带宽和阵列capability.Multiple访问信令：先进的多用户接收机的设计将考虑到多址干扰，固有参数失配的新特性，并提供多个数据速率的系统。 将采用耦合的模型阶数选择/参数估计技术，以最佳方式表征和减轻干扰。空时调制解调器：将通过现场测试验证空时特性的传统模型。实验改进的模型将用于优化空时编码。 耦合和解耦的空时处理算法将被开发用于执行多数据速率系统的多用户分离和信道均衡。差错控制：将采用物理层系统设计和网络层协议设计之间的交互/迭代设计过程来有效地分配系统复杂性。 为此，实验误差统计的特点和误差统计整形方法将被开发。 对于给定的错误统计，最优协议将被设计和分析。访问方法：基于从实验数据中得出的错误特性，我们将设计媒体访问控制协议，以支持及时建立消息流，并在存在信道错误和衰落的情况下支持不同级别的时间QoS。该试验台将用于研究无线链路的信道误差和衰落特性如何影响鲁棒切换机制的设计，以及如何对误差特性进行整形和调整以便于设计。 流量控制是一个重要的资源管理问题，可靠的数据传输，特别是在高需求的情况下。 针对通信网络基本流量控制问题中出现的一类时变时滞系统模型，提出了一种稳定、鲁棒、自适应的控制器设计方案，该研究项目解决了美国国家科学基金会（NSF）为资助研究项目建立的几个优先事项。该项目被设计为合作和跨学科的，每个问题都被专门选择，以利用现有的和成熟的专业知识的俄勒冈州立大学团队。 此外，研究目标的成功实现需要理论和实验活动的融合。该项目利用现有设施，但也将改善未来研究和教育工作的基础设施。研究生培训将在拟议研究的执行中发挥重要作用，该工作独特的双重理论和实验性质将提供丰富的教育环境。