采用混合多址技术的卫星系统反向链路遍历容量分析  

Ergodic capacity for return link of satellite systems with hybrid multiple access

作　　者：郭焱 孔槐聪 廖向荣 林敏[1] 欧阳键 GUO Yan;KONG Huaicong;LIAO Xiangrong;LIN Min;OUYANG Jian(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;China Mobile Suzhou Research and Development Center,Suzhou 215009,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]中国移动(苏州)软件技术有限公司,江苏苏州215009

出　　处：《南京邮电大学学报（自然科学版）》2023年第4期16-25,共10页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：重点国际合作项目(61720106003);南京邮电大学引进人才科研启动基金(NY220111);江苏省研究生科研与实践创新计划(KYCX21_0739)资助项目。

摘　　要：近年来,点波束和非正交多址接入技术作为提升卫星系统资源利用率和传输速率的有效手段,受到了工业界和学术界的广泛关注。文中提出了一种联合时域⁃功率域的混合多址接入技术的多用户卫星通信系统传输方案,并对其反向链路的遍历容量进行了分析。首先,结合点波束技术将卫星覆盖范围内的多个用户分为若干个组,组内用户采用非正交多址技术,每个用户组采用时分多址技术,从而获得更高的频谱效率。其次,为了验证所提传输方案的性能,在卫星采用放大转发协议和卫星链路服从阴影莱斯分布的条件下,推导出卫星系统反向链路遍历容量的闭合表达式。最后,计算机仿真验证了理论分析的正确性,以及所提传输方案相较于现有调度方案在提升系统容量方面具有的优势,从而为实际的方案设计和工程应用提供参考。Spot beam and non⁃orthogonal multiple access technology are effective means to improve the spectral efficiency and transmission rate of satellite communication systems,and have attracted extensive attention from both industry and academia.In this paper,we propose a multi⁃user satellite communication transmission scheme based on the hybrid time⁃power domain multiple access technology,and analyze the ergodic capacity of its return link.Firstly,multiple users covered by a satellite spot beam are divided into several groups.To achieve higher spectral efficiency,the non⁃orthogonal multiple access technology is used for users within the groups to access the satellite while the time division multiple access is used for each user group.Secondly,we assume that the satellite adopts the amplify⁃and⁃forward protocol and satellite links obey the shadowed⁃Rician distribution.Thus,a closed⁃form expression of the ergodic capacity for the return link of satellite system is derived to demonstrate the performance of the proposed scheme.Finally,simulations verify the correctness of the theoretical analysis and the superiority of the proposed scheme in improving system capacity compared to existing schemes.The proposed scheme provide a guidance for the design and application of this kind of system in practice.

关 键 词：卫星通信 放大转发协议 混合多址接入 阴影莱斯信道 

分 类 号：TN925[电子电信—通信与信息系统]