ITR: High-Speed Distributed Wireless Communication Networks

拟议的研究研究敏捷无线网络的设计，以适应通信信道，信息源和网络拓扑结构的时变。这项研究将导致设计原则，除了能够更有效地利用目前的蜂窝和PCS频段，将允许利用10-100 GHz范围内的频段，为室内和室外应用提供高速多媒体服务。虽然将坚持无线接入高速通信和计算骨干的基本蜂窝范例，但将重新审查现有第二代和计划中的第三代蜂窝和PCS网络中的几乎所有其他假设。与当前设计的一些显著差异如下。密集的基站网络将提供连接，尽管在较高的频带处存在高路径损耗和尖锐的阴影。具有明确定义的边界的小区可能不再存在，并且移动的终端将看到快速变化的网络拓扑。将考虑各种流量类别，如语音、数据和视频，以及关于延迟、丢失、再现质量和潜在接收器数量的不同要求。分组传输将被认为是一种支持多媒体应用的灵活手段，以使目前基于电路的蜂窝集群不适用。这种方法的一个关键要素是设想新的应用和新的整体系统结构。基于传播研究和对所载数据流要求的分析的建模将用于不断修订概念系统，并为诸如信源编码、信道估计、干扰抑制、路由选择和拥塞控制的联合实施等事项的算法设计提供模型。的算法的性能将进行广泛的评估，包括在VLSI的实施方面，适当的，其结果将导致进一步修订和完善的整体系统架构。许多权衡将被探索，如分布式软检测的性能和组装所需的信息所需的网络容量之间的权衡。综合研究工作将由五个重叠的伊利诺伊大学的研究人员和他们的学生，围绕以下跨学科项目组织的研究小组进行：概念系统，建模和性能限制无线分组网络的设计原则设计时变网络联合优化源代码，信道编码和估计超大规模集成电路算法，架构和边界所要求的资金的大部分将用于支持学生。大多数教师和学生在协调科学实验室内有相邻的办公室，这是一个精心培养的环境，以促进激烈的互动和合作。定期安排的每周会议的研究人员被用来协调研究，并确定更好地整合设计方法的机会。一个由行业关键技术人员组成的外部咨询委员会将有助于确保研究重点放在未来可能重要的问题上。 该建议是对NSF资助的NSF CCR 79381 \An Integrated Exploration of Wireless Network Communication的补充。“这笔赠款从1999年10月1日开始的三年内提供70万美元的资金，而最初的资金要求是在五年内提供250万美元。虽然该提案被评为极具竞争力，但收到的资金只涵盖六名学生，没有教师的时间。额外的资金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