CAREER: A Network Information Theoretic Approach to Wireless Ad-hoc and Sensor Networks

随着无线通信理论、技术和应用的最新进展，下一代无线系统的愿景是在任意结构的网络中，在具有挑战性的物理层条件下，使用在其发送/接收能力和协议栈层之间的边界方面更灵活的无线设备，进行任意相关数据的通信。本研究的目标是开发一个全面的信息理论框架，以确定此类网络的最终容量限制，并开发用于此类网络的高效编码、传输、接收和解码方案。这项研究分为四个紧密相关的部分：网络、数据、工具和渠道。本研究探讨了基本网络结构的容量区域和容量实现发送/接收/解码方案，这些结构是一般自组织多跳无线网络的组成部分，重点是干扰信道。本研究开发了相关数据和公共数据通信的原则。具体来说，研究者确定了相关/公共数据的最佳编码和传输方案，并研究了性能和复杂性之间的权衡；特别是，当执行源信道分离原则时，性能的损失。本研究开发了新的工具，并对现有的一些工具进行了集成和联合优化；重点是用户协作和功率控制的联合优化。本研究将无线通信信道的衰落特性整合到所有的问题公式中。信道中衰落的存在既具有挑战性，又具有偶然性，如果仔细地利用它来利用网络容量，则更具有偶然性。研究者将信道衰落的存在纳入容量评估（因此，遍历和中断容量），纳入通用/相关数据的编码和传输方案，以及工具的开发。------------------

With the recent advances in theory, technology and applications ofwireless communications a vision of the next generation wirelesssystems arises to be that of communicating arbitrarily correlateddata, in arbitrarily structured networks, in challenging physicallayer conditions, using wireless devices that are more flexible interms of their transmitting/receiving capabilities and in terms of theboundaries between the layers of their protocol stack. The goal ofthis research is to develop a comprehensive information theoreticframework for determining the ultimate capacity limits of suchnetworks and for developing efficient coding, transmission, receptionand decoding schemes to be used in such networks.The research is structured into four heavily interrelated parts:network, data, tools, and channel. This research investigates thecapacity regions and capacity achieving transmit/receivecoding/decoding schemes of basic network structures that are buildingblocks of general ad-hoc multi-hop wireless networks, with an emphasison the interference channel. This research develops principles ofcommunicating correlated and common data. Specifically, theinvestigator determines the optimum coding and transmission schemesfor correlated/common data and also studies the trade-offs betweenperformance and complexity; in particular, the loss in performancewhen the source-channel separation principle is enforced. Thisresearch develops new tools and integrates and jointly optimizes someof the existing tools; the emphasis is on the joint optimization ofuser cooperation and power control. This research integrates thefading nature of the wireless communication channel into all of theproblem formulations. The existence of fading in the channel can beboth challenging and fortuitous, more the latter, if it is carefullyexploited to the advantage of the network capacity. The investigatorincorporates the existence of the channel fading into the capacityevaluations (hence, ergodic and outage capacities), into coding andtransmission schemes for common/correlated data, and also into thedevelopment of the tools.------------------