ITR/SI: Multi-Antenna, Multi-User Communications

下一代移动无线通信系统(第三代及以后的移动通信系统)有望提供高数据速率，容纳高移动用户，并支持包括数据、语音、视频和交互式多媒体在内的多种业务。功率(电池)的限制和无线电频谱的稀缺(相对于此类服务的雄心)将决定对蜂窝网络的需求，在蜂窝网络中，这些资源必须得到高效利用，以支持未来对无线服务持续增长的需求。为了满足这一需求，物理层所需的基本基础设施是功率和带宽高效的多天线多用户无线通信技术。该项目的研究人员将通过研究高性能、抗干扰的接收器、签名序列设计和多用户信号星座优化来发展多用户、多发射天线通信理论的几个关键方面。他们的目标是通过简单的系统设计，实现在衰落信道上实现多天线无线通信所能达到的功率和频谱效率的权衡。在强调基本极限的同时，研究人员还将重点研究复杂度受限的系统。他们将在过载的码分多址系统的多用户检测和多接收天线的签名序列优化理论方面取得成果。这些结果将被推广到编码调制和多发射(和接收)天线系统，以便通过更复杂的信令策略与次优的、复杂度受限的高性能多用户解码方法相结合来进一步提高性能和/或可实现的频谱效率。

Future generation mobile wireless communication systems (third generationand beyond) are expected to provide high data rates, accomodate highlymobile users, and support a wide variety of services including data, voice,video and interactive multimedia. Power (battery) limitations andthe scarcity of radio spectrum (relative to the ambitions of such services)will dictate the need for cellular networks in which these resourcesmust be used highly efficiently so as to support the continued growthin demand for wireless services into the future. Theessential infrastructure required at the physicallayer to fulfill this demand is a power and bandwidth efficient,multi-antenna, multi-user wireless communications technology.The investigators of this project will develop several key aspects of atheory of multi-user, multi-transmit antenna communication through a studyof high-performance, interference resistant receivers, signature sequencedesigns and multi-user signal constellation optimization. Their goal is torealize, through simple system design, the power and spectral efficiencytrade-offs that are achievable for multi-antenna wireless communicationsover fading channels. While emphasizing fundamental limits, theinvestigators will also focus on complexity constrained systems as well.They will develop results in the theory of multi-user detection andsignature sequence optimization for multiple receive antennas for overloadedCDMA systems. Generalization of these results will be pursued to codedmodulation and multiple transmit (and receive) antenna systems in order tofurther improve the performance and/or achievable spectral efficienciesthrough more sophisticated signaling strategies combined with sub-optimal,complexity-constrained, high-performance multi-user decoding methods.