Outage analysis of aerial semi-grant-free NOMA systems

IF 7.5 2区计算机科学 Q1 TELECOMMUNICATIONS

Digital Communications and Networks Pub Date : 2024-10-01 DOI:10.1016/j.dcan.2023.10.001

Hongjiang Lei , Chen Zhu , Ki-Hong Park , Imran Shafique Ansari , Weijia Lei , Hong Tang , Kyeong Jin Kim

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引用次数: 0

Abstract

In this paper, we analyze the outage performance of Unmanned Aerial Vehicles (UAVs)-enabled downlink Non-Orthogonal Multiple Access (NOMA) communication systems with the Semi-Grant-Free (SGF) transmission scheme. A UAV provides coverage services for a Grant-Based (GB) user and one Grant-Free (GF) user is allowed to utilize the same channel resource opportunistically. The analytical expressions for the exact and asymptotic Outage Probability (OP) of the GF user are derived. The results demonstrate that no-zero diversity order can be achieved only under stringent conditions on users' quality of service requirements. Subsequently, an efficient Dynamic Power Allocation (DPA) scheme is proposed to relax such data rate constraints. The analytical expressions for the exact and asymptotic OP of the GF user with the DPA scheme are derived. Finally, Monte Carlo simulation results are presented to validate the correctness of the derived analytical expressions and demonstrate the effects of the UAV's location and altitude on the OP of the GF user.

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空中半无赠品 NOMA 系统的中断分析

本文分析了采用半自由赠送（SGF）传输方案的无人机（UAV）下行非正交多址（NOMA）通信系统的中断性能。无人飞行器为一个基于授权（GB）的用户提供覆盖服务，并允许一个无授权（GF）用户伺机利用相同的信道资源。推导出了 GF 用户的精确和渐近中断概率 (OP) 的分析表达式。结果表明，只有在用户服务质量要求严格的条件下才能实现无零分集阶。随后，提出了一种有效的动态功率分配 (DPA) 方案，以放宽此类数据速率限制。推导出了使用 DPA 方案的 GF 用户精确和渐进 OP 的分析表达式。最后，介绍了蒙特卡罗仿真结果，以验证推导出的分析表达式的正确性，并证明无人机的位置和高度对 GF 用户 OP 的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Digital Communications and Networks Computer Science-Hardware and Architecture

CiteScore

12.80

自引率

5.10%

发文量

915

审稿时长

30 weeks

期刊介绍： Digital Communications and Networks is a prestigious journal that emphasizes on communication systems and networks. We publish only top-notch original articles and authoritative reviews, which undergo rigorous peer-review. We are proud to announce that all our articles are fully Open Access and can be accessed on ScienceDirect. Our journal is recognized and indexed by eminent databases such as the Science Citation Index Expanded (SCIE) and Scopus. In addition to regular articles, we may also consider exceptional conference papers that have been significantly expanded. Furthermore, we periodically release special issues that focus on specific aspects of the field. In conclusion, Digital Communications and Networks is a leading journal that guarantees exceptional quality and accessibility for researchers and scholars in the field of communication systems and networks.