CIF:Small: Asynchrony and Limited Feedback in Next Generation Multiple Access

无线通信已经成为现代社会不可或缺的一部分，对提高生活质量产生了重大影响。无线通信在经济的不同领域的应用，以及它们在创建和扩大新业务方面的使用，产生了对更高数据吞吐量的巨大需求。对更高传输数据速率的未得到满足的需求要求设计更高效的无线通信网络。为了提高下一代无线网络的效率，使用相同资源的不同用户的并发传输是不可避免的。了解如何处理下一代通信系统中的异步和有限反馈，这对于设计未来的无线网络至关重要。该项目还将把它的发现整合到下一代无线网络的课程和教育倡议中。现有的无线通信标准在很大程度上依赖于正交多址系统，在该系统中，每个用户都被分配了正交的时间/频率/代码资源。这不适合海量连接和海量数据的同时传输。因此，已经提出了允许多个用户同时访问相同无线资源的更有效的多址接入方法作为补救措施。从正交多址到例如非正交和免授权的其他可能的多址设计的范例转变被称为下一代多址(NGMA)。尽管完美同步和信道状态信息假设对于正交多址来说可能是合理的，但是对于NGMA系统来说，这样的假设既不现实也不理想。因此，在本项目中考虑的NGMA系统中存在未得到满足的重新审视异步和有限的信道状态信息的角色的需求。该项目将分析不同NGMA系统的性能和设计，采用异步传输和有限的反馈。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Wireless communications have become an integral part of modern society, with significant impact in improving the quality of life. The applications of wireless communications in different parts of the economy and their use in creating and expanding new businesses have created a tremendous demand for higher data throughputs. The unmet need for higher transmission data rates requires designing more efficient wireless communication networks. To increase the efficiency of the next generation of wireless networks, the concurrent transmission of different users using the same resources is unavoidable. Understanding how to deal with asynchrony and limited feedback in the next generation of communication systems, as pursued in this project, is essential for designing the wireless networks of the future. The project will also integrate its findings into coursework and educational initiatives in next-generation wireless networks.Existing wireless communication standards heavily rely on orthogonal multiple access systems in which each user is allocated orthogonal time/frequency/code resources. This is not suitable for massive connectivity and simultaneous transmission of a huge amount of data. Therefore, more efficient multiple access methods that allow multiple users to simultaneously access the same wireless resources have been proposed as a remedy. The paradigm shift from orthogonal multiple access to other possible multiple access designs that are, for example, non-orthogonal and grant-free is dubbed next generation multiple access (NGMA). While perfect synchronization and channel state information assumptions may be reasonable for orthogonal multiple access, such assumptions are neither realistic nor desirable for NGMA systems. Therefore, there is an unmet need to revisit the role of asynchrony and limited channel state information in NGMA systems as considered in this project. Analyzing the performance and the design of different NGMA systems with asynchronous transmission and limited feedback will be performed in this project.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.