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

无绳和无处不在的网络接入有着巨大的市场，对游牧计算和通信的需求也很大。这种系统的一个主要组成部分是高速鲁棒无线局域网（WLAN），它为有限的地理区域提供服务。这种有限的地理区域使大密度的接入点和高功率传输成为可能，并开辟了可与有线系统相媲美的高速率鲁棒多媒体通信的可能性。尽管带宽仍然稀缺，但现在可以利用空间维度：典型的WLAN设备（如笔记本电脑和手持电脑）的尺寸允许多个天线的适当间隔，以提供分集和编码增益。本研究旨在为WLAN环境中的多天线方法进行完整的系统设计，包括专门为WLAN信道的慢衰落环境量身定制的编码、调制、信道估计和功率控制策略。特别是，开发了高速率多天线编码调制技术和多发射天线联合源信道编码策略。研究了带反馈的信道估计问题，并讨论了基于有限反馈的功率控制问题。通过为wlan环境中空间分离天线提供理论基础，探索了多发射天线方法的一般方法。教育计划与研究工作紧密结合，通过利用理工大学新安装的校园无线局域网系统，强调在教育中使用互联网和计算机。课程开发针对理工学院专业硕士课程的特定需求，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.