A Practical Approach Multi-User Channels with Unknown Fading

综合、混合和复杂系统圣母大学奥利弗·柯林斯实用方法具有未知衰落的多用户信道这项研究的目的是为具有未知衰落特性的信道开发实用的通信方案和接收器。采用的基本方法是迭代估计和干扰消除。具体地说，这项研究旨在开发简化的接收机和估计器，以便将这些技术应用到实际系统中。智能优点：这项工作考虑了在未知衰落的多用户信道中实现接近性能极限的实用方案。基本上，物理世界中的所有频道都有未知的衰落。然而，由于分析上的困难，大多数工作都假设在接收器和/或发射器上有关于衰落的辅助信息。因此，现有的知识体系不能准确地解释在未知的情况下，衰落过程可能造成的能力急剧下降。这项研究试图解决这一不足。更广泛的影响：该项目的更广泛影响包括以低得多的成本建设更高容量的无线通信系统，并能够比目前的蜂窝语音和数据网络在更大的区域内提供服务。因此，这项研究有可能促进移动和/或农村宽带服务，增加获得紧急服务的机会，并改善科学数据收集。这项研究还建立了理论和实践之间的联系，这对吸引新学生进入工程学至关重要。该项目帮助创建和扩大了美国学生进入高等工程教育的渠道。

Integrative, Hybrid and Complex SystemsOliver Collins, University of Notre DamePractical Approach Multi-User Channels with Unknown FadingThe objective of this research is to develop practical and useful communication schemes and receivers for channels with fading characteristics that are unknown to the transmitters and receivers. The fundamental approach pursued is iterative estimation and interference cancellation. Specifically, the research seeks to develop simplified receivers and estimators so that the techniques can be applied to real systemsIntellectual Merit: This work considers practical schemes for achieving capacity approaching performance limits for multi-user channels with unknown fading. Essentially all channels in the physical world have unknown fading. However, because of analytical difficulties, most work assumes side information about the fading is available at the receivers and/or transmitters. Thus, the existing body of knowledge does not accurately account for the potential dramatic reduction in capacity produced by the fading process when it is unknown. This research attempts to address this deficiency.Broader Impacts: The broader impacts of the project include the construction of higher-capacity wireless communications systems at a much lower cost, and with the ability to provide service to a far larger area, than present cellular voice and data networks. The research, thus, has the potential to facilitate mobile and/or rural wideband services, increase access to emergency services, and improve scientific data collection. The research also establishes connections between theory and practice that is essential for attracting new students into engineering. The project aids in creating and expanding a pipeline for U.S. students to enter advanced engineering education.