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

无线通信已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。无线通信在经济不同领域的应用及其在创建和扩展新业务方面的应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满足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，不同用户使用相同的资源进行并发传输是不可避免的。了解如何处理本项目所追求的下一代通信系统中的异步和有限反馈，对于设计未来的无线网络至关重要。该项目还将把研究结果整合到下一代无线网络的课程作业和教育计划中。现有的无线通信标准严重依赖于正交多址系统，其中每个用户被分配正交的时间/频率/码资源。这并不适合大规模连接和同时传输大量数据。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方法作为补救措施。从正交多址到其他可能的多址设计（例如，非正交和无授权）的范式转变被称为下一代多址（NGMA）。虽然完美的同步和信道状态信息假设对于正交多址可能是合理的，但这种假设对于NGMA系统来说既不现实也不可取。因此，有一个未满足的需求，即重新审视异步和有限通道状态信息在NGMA系统中的作用，如本项目所考虑的。本课题将对不同异步传输和有限反馈的NGMA系统进行性能分析和设计。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值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.