Advanced multi-user systems for wireless communication networks

对语音、电子邮件和交互式多媒体等具有差异化服务的无处不在的宽带无线接入的需求日益增长，这是无线通信技术进步的关键驱动力。在无线链路的一端或两端的多个天线的可用性提供了大幅提高链路的可实现速率和可靠性的潜力，因此这些多输入多输出(MIMO)系统以某种形式出现在未来无线通信系统的几乎所有提案的物理层中。然而，无线介质从根本上来说是一个共享环境，具有固有的广播能力，但也相互干扰。如果无线网络(或多个网络)的物理层被设计成利用环境的共享性质，而不是独立地优化每条链路的性能，并且如果它动态地这样做，则可以更有效地使用由环境提供的通信资源。无论是在具有某种形式的集中控制的网络的情况下，例如单小区系统的上行链路和下行链路，还是在分布式控制的网络的情况下，例如协作通信系统、频谱覆盖(频谱覆盖)系统和自组织网络，这种资源的动态分配都提供了可提供的服务质量显著提高的潜力。拟议的研究计划的目标是为多用户收发机开发计算高效的设计技术，使无线网络能够有效地利用可用资源。由此产生的系统将构成实现未来无线网络愿景的一些构建块。设计技术的发展将以多用户信息理论和优化的见解(和贡献)为指导，设计的实施将利用“软件无线电”收发信机结构提供的灵活性。工作的重点将是基本设计原则的开发，但这些原则的专门化可以应用于特定标准机构或公司开发的系统。

The increasing demand for ubiquitous broadband wireless access with differentiated services, such as voice, email, and interactive multimedia, is a key driving force for advances in wireless communication technologies. The availability of multiple antennas at one or both ends of a wireless link provides the potential for substantial increases in the achievable rate and the reliability of the link, and hence these multiple-input, multiple-output (MIMO) systems appear, in some form, in the physical layer of almost all proposals for future wireless communication systems. However, the wireless medium is fundamentally a shared environment, with an inherent broadcast capability, but also mutual interference. The communication resources provided by the environment can be used more efficiently if the physical layer of the wireless network (or networks) is designed to take advantage of the shared nature of the environment, as distinct from optimizing the performance of each link independently, and if it does so dynamically. This dynamic allocation of resources offers the potential for a substantial increase in the quality of service that can be offered, both in the case of networks with some form of centralized control, such as the uplink and downlink of single-cell systems, and networks in which control is distributed, such as cooperative communication systems, spectral overlay ("cognitive") systems, and ad-hoc networks. The goal of the proposed research program is to develop computationally-efficient design techniques for multi-user transceivers that enable wireless networks to make efficient use of the available resources. The resulting systems will form some of the building blocks with which the visions of future wireless networks will be realized. The development of the design techniques will be guided by insights from (and contributions to) multi-user information theory and optimization, and the implementation of the designs will take advantage of the flexibility provided by the "software radio" transceiver architecture. The focus of the work will be on the development of fundamental design principles, but specializations of these principles could be applied to systems developed by particular standards bodies or companies.