首页|基于NOMA的卫星通信半免授权传输性能分析

基于NOMA的卫星通信半免授权传输性能分析

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卫星通信能够为地面用户提供广域范围、随遇接入的通信服务,近年来备受国内外学者的关注.文中研究了采用半免授权(SGF)传输方案的卫星通信系统的性能.根据卫星通信的特点,利用用户的统计信道状态信息,提出了一种基于上行非正交多址(NOMA)的SGF传输方案,从而提高系统的频谱效率和接入能力.假设卫星链路服从阴影莱斯分布,分别考虑移动终端采用随机接入和分布式争用两种方式的情况,推导出地球站和移动终端的中断概率以及整个系统吞吐量的闭合表达式.仿真结果验证了理论分析的正确性和所提方案的优越性,并定量分析了用户数、目标数据速率等典型参数对系统性能的影响.
On the performance of NOMA-based semi-grant-free transmission in satellite communications
Satellite communications have become a hot topic due to their ability to serve users with wide coverage and instant access.This paper investigates the performance of a satellite system with semi-grant-free(SGF)transmission scheme.To improve spectrum efficiency and access ability,we propose a non-orthogonal multiple access-based SGF transmission scheme,considering the feature of satellite communications by using the available statistical channel state information.We assume that the satellite links obey shadowed-Rician distribution,thus given the two cases,random access or distribution contention for mobile terminals,the closed-form outage probabilities of the earth station and mobile terminals,as well as the system throughput expression are derived.Simulation results demonstrate the effectiveness of the theoretical analysis and the superiority of the proposed schemes.Simulations also quantitatively analyze the influences of typical parameters,such as the user number,and the target data rate,on the system's performance.

satellite communicationsstatistical channel state informationnon-orthogonal multiple accesssemi-grant-free transmissionshadowed-Rician fading

郭焱、林敏、谈苗苗、孔槐聪、程铭

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南京邮电大学 通信与信息工程学院,江苏 南京 210003

卫星通信 统计信道状态信息 非正交多址接入 半免授权传输 阴影莱斯衰落

国家自然科学基金国家自然科学基金江苏省研究生科研与实践创新计划

6247125562301282KYCX24_1178

2024

10.14132/j.cnki.1673-5439.2024.05.003

南京邮电大学学报(自然科学版)
南京邮电大学

南京邮电大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.486
ISSN：1673-5439
年,卷(期)：2024.44(5)