CAREER: Multiple Transmit Elements for High Speed Robust Wireless Local Area Networks

无线和无处不在的网络接入有着巨大的市场，游牧计算和通信也有着巨大的需求。这种系统的一个主要组成部分是一个高速、健壮的无线局域网（WLAN），它为有限的地理区域提供服务。这种有限的地理区域使接入点的密度大，以及高功率传输，并开辟了高速率的可能性，鲁棒的多媒体通信相媲美的有线系统。尽管带宽仍然稀缺，但空间维度现在可以被利用：典型的无线局域网设备，如笔记本电脑和手持电脑的大小，使多个天线的适当间距，以提供分集和编码增益。信道估计和功率控制策略专门为WLAN信道的慢衰落环境量身定制。特别是，高速率多天线编码调制技术和多发射天线联合信源信道编码策略被开发出来。研究了沿着反馈的信道估计问题和基于有限反馈的功率控制问题，探讨了无线局域网环境下多发射天线方法的一般性途径，为空间分离天线提供了理论基础。该教育计划与研究工作紧密配合，并通过利用理工大学新安装的校园无线局域网系统，强调互联网和计算机在教育中的使用。课程开发解决了理工学院专业硕士课程的具体需求，并基于集成的端到端通信系统方法。

There is a tremendous market for tetherless and ubiquitous networkaccess, and a great demand for nomadic computation andcommunication. A major component of such a system is a high speedrobust wireless local area network (WLAN) that provides services for alimited geographical area. This limited geographical area enables alarge density of access points as well as high power tranmissions andopens up the possibility of high rate robust multimedia communicationscomparable to wired systems. Even though the bandwidth is stillscarce, the spatial dimension can now be exploited: The size oftypical WLAN devices, such as laptops and hand-held computers, enableproper spacing of multiple antennas to provide diversity and codinggains.This research is aimed at a complete system design for multipleantenna methods in the WLAN environment including coding, modulation,channel estimation and power control strategies specifically tailoredfor the slow fading environment of a WLAN channel. In particular,high-rate multiple antenna coded modulation techniques and multipletransmit antenna joint source and channel coding strategies aredeveloped. The issue of channel estimation along with feedback isinvestigated and power control based on limited feedback is adressed.A general approach to multiple transmit antenna methods is explored byproviding a theoretical foundation for spatially separated antennas inWLAN environments. The education plan is closely aligned with the research work andemphasises the use of internet and computers in education by makinguse of Polytechnic University's newly installed WLAN system oncampus. Curriculum development addresses specific needs ofPolytechnic's professional masters program and is based on anintegrated, end-to-end approach to communication systems.