Dynamic Full-Duplex single-channel wireless communication systems

由于需求的爆炸性增长，频谱的获取已成为限制通信系统提供高质量服务和覆盖潜力的首要问题之一。当前系统的一个基本限制是需要在半双工模式下运行，在这种模式下，为了支持双向通信，为正向和反向信道分配不同的频率，或者通信节点轮流进行。这两种方法都没有充分利用资源。本项目的研究重点是实现高效、稳健的带内全双工（FD）系统。在FD系统中，双向通信在同一频段同时进行，提高了频谱效率，简化了频率规划。通过该项目开发的模型和结果，研究人员和从业人员将能够更好地评估不同的FD技术和架构，从而显著改善下一代无线系统的性能和部署策略。使用FD系统收集的频谱可以重新利用，以改善对现有用户的服务，并为经济增长创造新的机会。该项目的目标是为全面了解FD系统的潜力奠定基本框架，特别是在无线信道快速发展的情况下。FD系统的最新进展表明，在接收和发送路径之间实现高水平的隔离是可行的，为一系列FD解决方案和应用铺平了道路。虽然已证明可以实现所需的隔离，但保持隔离极具挑战性，特别是在高度动态的无线信道中。提出的研究目标是利用空间、模拟和数字对消来研究FD系统的动力学，使系统能够在由传播条件、多径和干扰引起的不断变化的环境中可靠地运行。许多技术研究挑战将得到解决，包括开发能够快速适应动态无线信道的新启发式方法，利用新方法对操作条件进行认知学习。该项目是高度结构化的，因此中心主题在所有阶段都是一致的：开发和验证理论和算法，使FD系统能够在各种动态条件下运行。通过融合研究、教育和推广目标，在该奖项下开展的工作所产生的成果将广泛传播给研究人员、从业人员和公众。

Due to the explosive growth in demand, access to spectrum has become one of the overarching issues limiting the potential of communication systems to provide a high quality of service and coverage. A fundamental limitation of current systems is the need to operate in half-duplex modes, where to support bi-directional communication, different frequencies are assigned for forward and reverse channels, or alternatively, communicating nodes take turns in time. In both these approaches, resources are not fully utilized. The research undertaken in this project focuses on enabling efficient and robust, in-band Full Duplex (FD) systems. In FD systems, bi-directional communication occurs, simultaneously, in the same frequency band, improving spectral efficiency and easing frequency planning. Through the models and results developed in this project, researchers and practitioners will be able to better evaluate different FD techniques and architectures leading to significant improvements in performance and deployment strategies of next generation wireless systems. Spectrum that is harvested using FD systems can then be repurposed to improve service to existing users as well as create new opportunities for economic growth. The goal of the project is to lay out the basic framework for a thorough understanding of the potential of FD systems, especially in conditions where the wireless channel is rapidly evolving. Recent advances in FD systems have shown that it is feasible to attain high levels of isolation between receive and transmit paths, paving the way to a host of FD solutions and applications. While achieving a desired isolation has been proven, it is extremely challenging to maintain the isolation, especially in highly dynamic wireless channels. The objective of the proposed research is to study the dynamics of FD systems utilizing spatial, analog and digital cancellation to enable the system to operate reliably in constantly changing environments caused by propagation conditions, multipath, and interference. A number of technical research challenges will be addressed including developing new heuristics that are capable of adapting to the dynamic wireless channel rapidly, utilizing novel approaches to cognitive learning of the operational conditions. The project is highly structured such that the central theme is consistent throughout all phases: develop and validate theory and algorithms to enable FD systems under a wide variety of dynamic conditions. Through a fusion of research, educational and outreach goals, results generated from the work performed under this award will be widely disseminated to researchers, practitioners, and the general public.