NeTS: Small: Low Latency Uplink Communications in Low Earth Orbit (LEO) Satellite Networks with Chirp Permutation Multiple Access (CPMA)

NeTS：小型：低地球轨道 (LEO) 卫星网络中采用线性调频排列多址 (CPMA) 的低延迟上行链路通信

• 批准号: 2312113
• 负责人: Zhenghao Zhang
• 金额: $ 55万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-10-01 至 2026-09-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2312113&HistoricalAwards=false
• 关键词: NeTS; Small; Low; Latency; Uplink

In this project, Chirp Permutation Multiple Access (CPMA) is proposed, which is a novel wireless communication technology for Low-Earth-Orbit (LEO) satellite networks aiming at achieving minimum communication latency on the uplink from the user terminals to the satellite. LEO satellite networks have emerged as a strong option to complement the existing wireless infrastructure, especially for providing broadband data services to areas that are traditionally difficult to reach, such as rural areas and oceans. CPMA addresses one of the key challenges in LEO satellite networks, namely, the communication latency, and will enable applications that are highly sensitive to latency, such as automatic driving and gaming. CPMA minimizes latency by reducing it to the one-way propagation delay from the user terminal to the satellite, because CPMA allows user terminals to transmit packets at any time without coordinating with each other or waiting for decisions on resource allocations. By enabling novel applications, CPMA will benefit society and improve quality of life. This project will advance the knowledge and understanding on grant-free communications in wireless networks. Results from this project will be integrated with education, such as used in course projects. Undergraduate students and students from underrepresented and minority groups will be actively recruited.The key novelty of CPMA is its physical layer, which allows the satellite to decode overlapping packets from multiple user terminals and enables grant-free communications over the uplink. The CPMA modulates data by transforming the chirp waveform, which is a complex vector with constant magnitude and linearly increasing frequency. The key transformation is the permutation of the chirp, which can effectively reduce the impact of interference across packets. In this project, both the physical layer and the link layer of CPMA will be designed, implemented, and tested. The physical layer will be optimized with permutations with proven guarantees and multiple types of transformations of the chirp. The link layer will fully harness the capabilities of the physical layer and solve problems such as efficient packet retransmission and transmission power control based on collective feedback from multiple user terminals close to each other. Theoretical analysis will be conducted to reveal the network capacity and prove the optimality of the design. CPMA is expected to achieve ultra-low latency, high data rate, and high network capacity. CPMA will be implemented on USRPs and demonstrated in open platforms such as POWDER, as well as evaluated with simulations driven by channel traces and widely accepted channel models.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.

在该项目中，提出了线性调频排列多址（CPMA），这是一种用于低地球轨道（LEO）卫星网络的新型无线通信技术，旨在实现从用户终端到卫星的上行链路上的最小通信延迟。 LEO卫星网络已成为补充现有无线基础设施的有力选择，特别是为传统上难以到达的地区（例如农村地区和海洋）提供宽带数据服务。 CPMA 解决了 LEO 卫星网络的关键挑战之一，即通信延迟，并将支持对延迟高度敏感的应用，例如自动驾驶和游戏。 CPMA通过将延迟减少到从用户终端到卫星的单向传播延迟来最小化延迟，因为CPMA允许用户终端在任何时间传输数据包，而无需彼此协调或等待资源分配决策。通过实现新颖的应用，CPMA 将造福社会并提高生活质量。该项目将增进对无线网络中无资助通信的认识和理解。该项目的结果将与教育相结合，例如在课程项目中使用。将积极招募本科生以及来自代表性不足和少数群体的学生。CPMA 的主要新颖之处在于其物理层，它允许卫星解码来自多个用户终端的重叠数据包，并实现上行链路上的无授权通信。 CPMA 通过变换线性调频波形来调制数据，线性调频波形是一个具有恒定幅度和线性增加频率的复矢量。关键的变换是chirp的排列，可以有效减少数据包间干扰的影响。在这个项目中，CPMA的物理层和链路层都将被设计、实现和测试。物理层将通过具有经过验证的保证的排列和多种类型的线性调频变换进行优化。链路层将充分利用物理层的能力，解决高效的数据包重传和基于彼此靠近的多个用户终端的集体反馈的传输功率控制等问题。将进行理论分析以揭示网络容量并证明设计的最优性。 CPMA有望实现超低延迟、高数据速率和高网络容量。 CPMA 将在 USRP 上实施，并在 POWDER 等开放平台中进行演示，并通过通道轨迹驱动的模拟和广泛接受的通道模型进行评估。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力评估进行评估，被认为值得支持。优点和更广泛的影响审查标准。