Fundamental Limits in Delay-Constrained Wireless Communication

无线技术提供了连接、灵活性和自由的独特组合。它在弥合移动设备与既定通信基础设施之间的差距方面发挥着重要作用。今天，无线技术正以越来越大的活力受到欢迎。这一趋势反映在对多跳无线网络日益增长的兴趣上。无线系统有潜力实现普及计算和无处不在的网络访问的长期承诺。这项研究计划旨在为信息技术的下一个重大进步奠定基础：建立可靠的无线多跳网络，支持对延迟敏感的应用，如互联网协议上的语音、视频会议、远程控制和游戏。该项目的总体目标是将排队分析和编码理论的概念结合起来，为延迟敏感型流量提供可靠的服务。从信息论的角度看无线通信，传统上忽视了实际信源和信道的突发性。由于关注于渐近吞吐量限制，信息论常常忽略了延迟在服务质量中的作用。延迟分布、解码失败概率和缓冲区占用概况都对通信链路的感知质量有重大影响。理解资源分配、代码设计和系统性能之间的相互作用需要一种新的思维方式和不同的系统视角。队列感知通信和代码设计在新兴的多跳无线网络中尤为重要，其中信道变化和延迟的不利影响由于信息包的连续中继而变得更加复杂。本项目旨在确定一种新的方法，用于分析和设计无线通信系统和网络，部分基于大偏差理论和新的编码范式。

Wireless technology offers a unique mixture of connectivity, flexibility, and freedom. It plays an instrumental role in bridging the gap between mobile devices and established communication infrastructures. Today, wireless technology is being embraced with increasing vigor. This trend is reflected in the growing interest in multihop wireless networks. Wireless systems have the potential to fulfill the long-standing promise of pervasive computing and ubiquitous network access. This research initiative seeks to provide a foundation for the next radical advance in information technology: building reliable wireless multihop networks that can support delay-sensitive applications such as voice over internet protocol, video conferencing, remote control and gaming.The overarching goal of this project is to combine the concepts of queueing analysis and coding theory to enable reliable service for delay-sensitive traffic. An information theoretic perspective on wireless communication has traditionally ignored the bursty nature of practical sources and channels. By focusing on asymptotic throughput limits, information theory often overlooks the role of delay in service quality. Delay distributions, probabilities of decoding failure, and buffer occupancy profiles all have major impacts on the perceived quality of communication links. Understanding the interplay between resource allocation, code design, and system performance necessitates a new mindset and a different system perspective. Queueing-aware communication and code design are especially important in emerging multihop wireless networks, where the adverse effects of channel variations and delay get compounded by the successive relaying of information packets. This project seeks to identify a new methodology for the analysis and the design of wireless communication systems and networks based, in part, on large-deviation theory and novel coding paradigms.