ITR: High-Speed Distributed Wireless Communication Networks

本文研究了适应通信信道时变、信息源时变和网络拓扑时变的敏捷无线网络设计。该研究将带来设计原则，除了能够更有效地利用当前的蜂窝和PCS频段外，还将允许开发10-100 GHz范围的频段，为室内和室外应用提供高速多媒体服务。虽然高速通信和计算骨干的无线接入的基本蜂窝范式将被坚持，但几乎所有现有的第二代和预计的第三代蜂窝和pc网络中的其他假设都将被重新审视。与当前设计的一些显著差异如下。一个密集的基站网络将提供连接，尽管高路径损耗和高频段的尖锐阴影。边界明确的小区可能不再存在，移动终端将看到快速变化的网络拓扑结构。各种流量类别，如语音、数据和视频，对延迟、丢失、再现质量和潜在接收器数量的不同要求将被考虑。分组传输将被认为是支持这种多媒体应用的灵活手段，因此目前基于电路的蜂窝集群不适用。该方法的一个关键要素是设想新的应用程序和新的整体系统体系结构。基于传播研究和承载数据流需求分析的建模将用于不断修订概念系统，并为诸如源编码、信道估计、干扰抑制、路由和拥塞控制等联合实现的算法设计提供模型。算法的性能将被广泛评估，包括在VLSI中适当的实现方面，结果将导致进一步修订和完善整个系统架构。我们将探讨许多权衡，例如分布式软检测的性能与收集所需信息所需的网络容量之间的权衡。整合的研究工作将由伊利诺伊大学教师调查人员及其学生组成的五个重叠的研究团队进行，围绕以下跨学科项目组织：概念系统，建模和性能限制，无线分组网络设计原则，时变信道设计，联合优化源编码，信道编码和估计，vlsi算法，架构，申请的大部分资金将用于支持学生。大多数教师和学生在协调科学实验室里有相邻的办公室，这是一个精心培育的环境，以促进密切的互动和合作。每周定期召开的调查人员会议用于协调研究并确定更好地集成设计方法的机会。一个由工业界关键技术人员组成的外部咨询委员会将帮助确保研究集中在未来可能重要的问题和问题上。本提案是对NSF拨款NSF CCR 79381 \无线网络通信的综合探索的补充。这笔拨款从1999年10月1日开始，为期3年，资助金额为70万美元，而最初的资助要求是在5年内提供250万美元。尽管该提案被评为竞争激烈，但获得的资金只涵盖了6名学生，而且没有教师时间。额外拨款将大大提高我们实现研究和教育目标的能力。关键词：无线网络，衰落信道，多媒体通信

The proposed research studies the design of agile wireless networks that accommodate timevariations in the communication channels, the information sources, and the network topology. The research will lead to design principles that, in addition to enabling more efficient use of the current cellular and PCS bands, will allow exploitation of frequency bands in the 10-100 GHz range to provide high-speed multimedia services for both indoor and outdoor applications. While the basic cellular paradigm of wireless access to a high-speed communication and computing backbone will be adhered to, nearly every other assumption in existing second-generation and projected third-generation cellular and PCS networks will be reexamined. Some of the significant differences from current designs are as follows. A dense network of base stations will provide connectivity despite the high path losses and sharp shadowing at higher frequency bands. Cells with well-defined boundaries may no longer exist, and mobile terminals will see a rapidly varying network topology. A variety of traffic classes, such as voice, data, and video, with diverse requirements regarding delay, loss, quality of reproduction, and number of potential receivers will be considered. Packetized transmission will be considered as a flexible means of supporting such multimedia applications so that current circuit-based cellular trunking is not applicable.A key element of the approach is to envision new applications and new overall system architec-tures. Modeling based on propagation studies and analysis of requirements for carried datastreams will be used both to continually revise the concept systems and to provide models for the design of algorithms for such things as joint implementation of source coding, channel estimation, interference suppression, routing and congestion control. The performance of the algorithms will be evaluated broadly, including aspects of implementation in VLSI as appropriate, and the results will lead to further revision and refinement of the overall system architecture. Many tradeoffs will be explored, such as the tradeoff_ between the performance of distributed soft detection and the network capacity needed to assemble the required information. The integrated research effort will be conducted by five overlapping research teams of University of Illinois faculty investigators and their students, organized around the following interdisciplinaryprojects:Concept Systems, Modeling, and Performance LimitsDesign Principles for Wireless Packet NetworksDesign for Time-Varying ChannelsJointly Optimized Source Coding, Channel Coding, and EstimationVLSI Algorithms, Architectures, and BoundsThe bulk of the requested funding will be used to support the students. Most of the faculty andstudents have adjacent offices within the Coordinated Science Laboratory, an environment carefully cultivated to promote intense interaction and collaboration. Regularly scheduled weekly meetings of the investigators are used to coordinate the research and identify opportunities for better integration of the design approach. An External Advisory Committee of key technical people from industry will help ensure that the research is focused on problems and issues likely to be important in the future. This proposal is to supplement NSF grant NSF CCR 79381 \An Integrated Exploration of Wireless Network Communication." That grant is funded at a level of $700K for three years beginning October 1, 1999, whereas the original funding request was for $2.5M over five years. Although the proposal was rated as highly competitive, the funding received covers only six students and no faculty time. Additional funding will greatly enhance our ability to achieve our research and educational goals. Keywords: Wireless networks, fading channels, multimedia communications