Multi-antenna technologies have already achieved a series of great successes in the development of information networks. For future space-ground integrated networks(SGINs), the traditional various kinds of separated i...Multi-antenna technologies have already achieved a series of great successes in the development of information networks. For future space-ground integrated networks(SGINs), the traditional various kinds of separated information networks will converge to a whole fully connected information network to provide more flexible and reliable services on a world scale. Regarding their great successes in existing systems, multiantenna technologies will be of critical importance for the realization of SGINs and multi-antenna technologies are definitely one of the most important enabling technologies for future converged SGINs. In this article, a comprehensive overview on multi-antenna technologies is given. We first investigate multi-antenna technologies from a theoretical viewpoint. It is shown that we can understand multi-antenna technologies in a general and unified point of view. This fact has two-fold meanings. First, the research on multi-antennas can help us understand the relationships between different technologies e.g., OFDMA, CDMA, etc. On the other hand,multi-antenna technologies are easy to integrate into various information systems. Following that, we discuss in depth the potentials and challenges of the multi-antenna technologies on different platforms and in different applications case by case. More specifically, we investigate spaceborne multi-antenna technologies, airborne multi-antenna technologies, shipborne multi-antenna technologies, etc. Moreover, the combinations of multiantenna technologies with other advanced wireless technologies e.g., physical layer network coding, cooperative communication, etc., are also elaborated.展开更多
随着6G的快速发展,天地一体化信息网络成为实现全球无缝覆盖的关键。围绕6G天地一体化网络中的调制技术展开专利分析,重点研究了基于循环前缀(Cyclic Prefix,CP)/离散傅里叶变换(Discrete Fourier Transform,DFT)扩展的正交频分复用(Ort...随着6G的快速发展,天地一体化信息网络成为实现全球无缝覆盖的关键。围绕6G天地一体化网络中的调制技术展开专利分析,重点研究了基于循环前缀(Cyclic Prefix,CP)/离散傅里叶变换(Discrete Fourier Transform,DFT)扩展的正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)、基于滤波器组/多带滤波的OFDM、正交啁啾分复用(Orthogonal Chirp Division Multiplexing,OCDM)、正交时频空间(Orthogonal Time Frequency and Space,OTFS)和仿射频分复用(Affine Frequency Division Multiplexing,AFDM)这5种调制技术的专利申请趋势、技术热点及竞争格局。研究结果表明,2020年后6G调制技术专利申请量激增,中国在专利数量上占据主导地位,AFDM因其在高动态信道中的优异性能成为未来6G标准的有力候选。揭示了专利领域的技术空白,为后续研发和专利布局提供了战略参考。展开更多
随着第六代移动通信系统(6th generation mobile communication system, 6G)通信技术的发展,空天地一体化网络(Spaceair-ground integrated network, SAGIN)作为6G的重要组成部分,旨在实现卫星、空中平台与地面系统的无缝互联,在应急通...随着第六代移动通信系统(6th generation mobile communication system, 6G)通信技术的发展,空天地一体化网络(Spaceair-ground integrated network, SAGIN)作为6G的重要组成部分,旨在实现卫星、空中平台与地面系统的无缝互联,在应急通信、环境监测、智能交通等领域展现出巨大的潜力.然而,SAGIN具有异构结构、链路动态性高、资源分布广泛等特征,给网络的高效管理与优化带来巨大的挑战.近年来,人工智能(Artificial intelligence, AI)技术凭借强大的感知、学习与自主决策能力应用于通信网络,为SAGIN的智能演进提供了新契机.本文首先系统介绍SAGIN网络架构的基本组成与关键特征,并梳理当前主流AI技术在网络优化中的主要技术体系与适配优势,包括机器学习、图神经网络以及强化学习.其次,本文深入探讨了AI技术在SAGIN中智能资源管理、移动性管理与路由优化、空中平台路径规划、任务卸载与计算协同等典型场景中的应用与最新进展.最后,本文总结了AI技术应用在SAGIN网络中面临的挑战并展望了AI与SAGIN融合发展的未来方向.本文概述了AI技术在SAGIN网络中应用的优势与进展,旨在为AI赋能的SAGIN研究与应用发展提供技术参考.展开更多
基金supported in part by National Scientific Foundation of China for Young Scholars(Grant Nos.61301088,61301089)
文摘Multi-antenna technologies have already achieved a series of great successes in the development of information networks. For future space-ground integrated networks(SGINs), the traditional various kinds of separated information networks will converge to a whole fully connected information network to provide more flexible and reliable services on a world scale. Regarding their great successes in existing systems, multiantenna technologies will be of critical importance for the realization of SGINs and multi-antenna technologies are definitely one of the most important enabling technologies for future converged SGINs. In this article, a comprehensive overview on multi-antenna technologies is given. We first investigate multi-antenna technologies from a theoretical viewpoint. It is shown that we can understand multi-antenna technologies in a general and unified point of view. This fact has two-fold meanings. First, the research on multi-antennas can help us understand the relationships between different technologies e.g., OFDMA, CDMA, etc. On the other hand,multi-antenna technologies are easy to integrate into various information systems. Following that, we discuss in depth the potentials and challenges of the multi-antenna technologies on different platforms and in different applications case by case. More specifically, we investigate spaceborne multi-antenna technologies, airborne multi-antenna technologies, shipborne multi-antenna technologies, etc. Moreover, the combinations of multiantenna technologies with other advanced wireless technologies e.g., physical layer network coding, cooperative communication, etc., are also elaborated.
文摘随着6G的快速发展,天地一体化信息网络成为实现全球无缝覆盖的关键。围绕6G天地一体化网络中的调制技术展开专利分析,重点研究了基于循环前缀(Cyclic Prefix,CP)/离散傅里叶变换(Discrete Fourier Transform,DFT)扩展的正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)、基于滤波器组/多带滤波的OFDM、正交啁啾分复用(Orthogonal Chirp Division Multiplexing,OCDM)、正交时频空间(Orthogonal Time Frequency and Space,OTFS)和仿射频分复用(Affine Frequency Division Multiplexing,AFDM)这5种调制技术的专利申请趋势、技术热点及竞争格局。研究结果表明,2020年后6G调制技术专利申请量激增,中国在专利数量上占据主导地位,AFDM因其在高动态信道中的优异性能成为未来6G标准的有力候选。揭示了专利领域的技术空白,为后续研发和专利布局提供了战略参考。
