| 摘要: |
| 针对基于正交多址接入（Orthogonal Multiple Access，OMA）技术的卫星通信网络资源利用率低的问题，提出了一种基于功率域非正交多址接入（Non-orthogonal Multiple Access，NOMA）技术的上行链路卫星通信方案。该方案在用户随机分布的前提下，利用最大或受限的发送功率同时同频发送信息给卫星节点，并采用串行干扰消除（Successive Interference Cancellation,SIC）方法提取各用户信息。通过构建用户随机位置信息与波束增益关系，分析了用户分布对系统性能的影响。通过仿真验证了基于NOMA技术的卫星上行通信网络在系统遍历容量方面具有的优势，并分析了关键参数对系统性能的影响。 |
| 关键词: 卫星通信 非正交多址接入(NOMA) 随机分布 发送功率 遍历容量 |
| DOI： |
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| 基金项目:国防科技大学科研计划重点项目（ZK18-02-11） |
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| Performance analysis of NOMA-based satellite networks with randomly deployed users |
| YAN Xiaojuan,AN Kang,ZHANG Qianfeng,YANG Lijun,LIANG Tao |
| (1a.College of Mechanical,Naval Architecture and Ocean Engineering,Beibu Gulf University,Qinzhou 535011,China;The 63rd Research Institute of National University of Defense Technology,Nanjing 210007,China;1b.College of Environment and Resources,Naval Architecture and Ocean Engineering,Beibu Gulf University,Qinzhou 535011,China) |
| Abstract: |
| To improve the resource utilization efficiency of satellite networks with the orthogonal multiple access(OMA)scheme,a power-domain non-orthogonal multiple access(NOMA)scheme is introduced in an uplink satellite network.For the proposed strategy,multiple randomly deployed users can simultaneously transmit to the satellite with their maximum or controlled transmission power,and the satellite decodes those signals by using the successive interference cancellation(SIC)strategy.Specially,the relationship between propagation and location information of served users to users’ beam gains is established,and then,the impact of location information on system performance is analyzed.Through numerical simulation， the superiority of the NOMA-based uplink satellite network is verified,and the impacts of key parameters,such as the users’ deployments and transmission powers,on system performance are analyzed. |
| Key words: satellite communication non-orthogonal multiple access(NOMA) randomly deployed transmission power ergodic capacity |
