Exploiting Multiple Antennas in Multiuser Wireless Networks

项目摘要北卡罗来纳州立大学的多输入多输出(MIMO)技术利用多用户无线网络中的多天线，利用发射机和接收器处的多天线来提高无线通信系统的性能。到目前为止，MIMO的大部分工作都集中在点对点通信和物理层性能指标上。然而，许多重要的无线应用在复杂的时变环境中涉及多个用户之间的激烈竞争，在这种环境中，吞吐量、延迟和异类用户服务质量等网络级指标可能更相关。虽然人们对点对点MIMO通信的了解很多，但高效的多用户MIMO网络的设计还远未得到很好的理解，并带来了更大的挑战。智能优点：该项目涉及多用户MIMO网络的物理层(PHY)和媒体访问控制(MAC)层协议的联合分析和设计。目的是了解PHY和MAC层协议如何组合以确定总体性能，以及如何联合设计这些协议以优化性能。讨论了三个主要问题：(A)不同信道条件下PHY层技术和MAC层技术之间的基本性能折衷；(B)联合设计PHY层和MAC层协议以促进层之间的协作而不是竞争；以及(C)不完美信道反馈的影响和最佳利用。更广泛的影响：该项目研究如何最好地在无线网络中部署多天线技术，这可能会对几种应用的新兴无线标准产生重大影响，包括蜂窝电话、无线局域网和传感器网络。该项目的材料将被纳入NCSU的无线课程，并将利用几个大学项目来鼓励代表不足的群体参与。PIS还将参与外展计划，向行业和更广泛的公众传播研究成果。

Project AbstractExploiting Multiple Antennas in Multiuser Wireless Networks Huaiyu Dai and Brian L. Hughes, NC State University Multiple-input multiple-output (MIMO) techniques exploit the presence of multiple antennas at the transmitter and receiver to improve performance in wireless communication systems. Most work on MIMO has thus far focused on point-to-point communications and physical-layer performance metrics. However, many important wireless applications involve substantial contention among multiple users in complex time-varying environments, in which network-level metrics such as throughput, latency and heterogeneous user quality-of-service may be more relevant. While much is known about point-to-point MIMO communication, the design of efficient multiuser MIMO networks is far less well understood and entails greater challenges. Intellectual Merit: This project deals with joint analysis and design of physical (PHY) and medium-access-control (MAC) layer protocols for multiuser MIMO networks. The aim is to understand how PHY and MAC-layer protocols combine to determine overall performance, and how these protocols can be jointly designed to optimize performance. Three main issues are addressed: (a) fundamental performance tradeoffs between PHY-layer techniques and MAC-layer techniques under diverse channel conditions, (b) joint design of PHY and MAC-layer protocols to promote collaboration between layers rather than competition, and (c) the impact and optimal exploitation of imperfect channel feedback. Broader Impacts: This project investigates how best to deploy multiple-antenna techniques in wireless networks, which may have a significant impact on emerging wireless standards for several applications, including cellular telephony, wireless LANs and sensor networks. Material from this project will be incorporated into wireless courses at NCSU, and several university programs will be exploited to encourage participation by underrepresented groups. The PIs will also participate in outreach programs to disseminate research findings to industry and the broader public.