As an extension and complement of the terrestrial network, the space information network has attracted extensive attention and is expected to play a significant role in the human society. In this article, we introduce an architecture of the space information network and summarize the key technical issues in the satellite-ground transmission. Then, we present traditional modulation schemes that highly affect the performance of the satellite-ground transmission and analyze their shortcomings which limit the development of space information networks. As an urgent and necessary mission to deal with the above shortcomings and promote the transmission performance of space information networks, new multicarrier modulation based satellite-ground transmission schemes are proposed in this article. We compare new multicarrier modulation schemes with traditional modulation schemes for satellite-ground transmission in detail, and conduct simulations to verify the superiority of new multicarrier modulation schemes. Finally, possible future research directions are identified.

中文翻译：

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空间信息网络星地传输的新型多载波调制


空间信息网络作为地面网络的延伸和补充，受到广泛关注，有望在人类社会中发挥重要作用。本文介绍了空间信息网络的架构，总结了星地传输的关键技术问题。然后，我们提出了严重影响星地传输性能的传统调制方案，并分析了它们限制空间信息网络发展的缺点。作为解决上述缺陷、提升空间信息网络传输性能的紧迫而必要的任务，本文提出了基于多载波调制的星地传输新方案。我们将新型多载波调制方案与星地传输的传统调制方案进行详细比较，并进行仿真验证新型多载波调制方案的优越性。最后，确定了未来可能的研究方向。