A Practical Approach Multi-User Channels with Unknown Fading

综合、混合和复杂系统奥利弗·柯林斯，诺特丹大学实用方法未知衰落的多用户信道本研究的目的是为发射机和接收机未知的衰落信道开发实用和有用的通信方案和接收机。所追求的基本方法是迭代估计和干扰消除。具体而言，该研究旨在开发简化的接收器和估计器，以便这些技术可以应用于实际系统。智力优点：这项工作考虑了实现具有未知衰落的多用户信道容量接近性能限制的实际方案。本质上，物质世界中的所有信道都有未知的衰落。然而，由于分析上的困难，大多数工作都假定接收机和/或发射机可以获得有关衰落的侧面信息。因此，现有的知识体系并不能准确地解释在未知的情况下，衰退过程所产生的潜在的能力急剧下降。本研究试图解决这一缺陷。更广泛的影响：该项目的更广泛的影响包括以更低的成本建设更高容量的无线通信系统，并且能够提供比目前的蜂窝语音和数据网络更大的服务。因此，这项研究有可能促进移动和/或农村宽带服务，增加获得应急服务的机会，并改进科学数据收集。这项研究还建立了理论与实践之间的联系，这对于吸引新的学生进入工程领域至关重要。该项目有助于建立和扩大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.