共查询到20条相似文献,搜索用时 93 毫秒
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《卫星电视与宽带多媒体》2009,(24):21-21
2009年12月2日上午9时,"2009中信卫星/亚洲卫星用户会议"在北京金融街国际会议中心拉开帷幕。本次大会由中国中信集团公司(下称"中信集团")旗下中信网络有限公司北 相似文献
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11月21日,中信网络公司亚洲卫星中国用户会议在三亚召开。来自全国各地的电信运营商、广电行业、政府相关机构部门、通信企业单位。科研院校的领导、专家、学者和业内人士参加了此次盛会。作为目前国内仅有的两家卫星转发器资源提供商之一,中信网络公司与用户和业界同仁探讨了卫星通信产业的发展途径和前景。 相似文献
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文中以卫星通信技术与5G技术概述为切入点,对卫星通信技术与5G技术之间的融合发展与应用进行了分析与探讨。在此基础上,进一步介绍和研究了融合卫星通信技术的5G网络技术和应用过程中的关键技术,希望能为提升我国卫星通信技术的优化发展以及通信领域的发展水平提供参考和借鉴,进一步推动我国社会经济水平的发展,提高技术应用能力,拓宽技术应用范围。 相似文献
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华政翔 《电信工程技术与标准化》2019,32(3)
本文介绍了5G非地面网络(Non-Terrestrial Networks /NTN)的应用场景,对比分析了采用卫星通信实现5G NTN的不同网络架构及其适合的应用方式,并进一步探讨了5G NTN急需解决的问题,提出可行的解决思路。 相似文献
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Generalized face super-resolution. 总被引:3,自引:0,他引:3
Existing learning-based face super-resolution (hallucination) techniques generate high-resolution images of a single facial modality (i.e., at a fixed expression, pose and illumination) given one or set of low-resolution face images as probe. Here, we present a generalized approach based on a hierarchical tensor (multilinear) space representation for hallucinating high-resolution face images across multiple modalities, achieving generalization to variations in expression and pose. In particular, we formulate a unified tensor which can be reduced to two parts: a global image-based tensor for modeling the mappings among different facial modalities, and a local patch-based multiresolution tensor for incorporating high-resolution image details. For realistic hallucination of unregistered low-resolution faces contained in raw images, we develop an automatic face alignment algorithm capable of pixel-wise alignment by iteratively warping the probing face to its projection in the space of training face images. Our experiments show not only performance superiority over existing benchmark face super-resolution techniques on single modal face hallucination, but also novelty of our approach in coping with multimodal hallucination and its robustness in automatic alignment under practical imaging conditions. 相似文献
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为了提高卫星通信系统的抗干扰和抗频偏能力,提出了一种在5G物理层波形中融入扩频技术的传输波形设计方案和辅同步信号(Secondary Synchroniztion Singnal,SSS)辅助主同步信号(Primary Synchronization Signal,PSS)多步联合抗干扰时频同步算法。该算法的实现分为3步:首先采用SSS辅助PSS二维时间同步得到粗同步点;然后根据粗同步点进行整数倍和小数倍频偏估计与补偿,其中小数倍频偏估计分为PSS扫频粗频偏估计和SSS辅助PSS互相关精频偏估计;最后对频偏补偿后的接收序列再次进行精时间同步和频偏补偿。仿真结果表明,所提设计方案和同步算法可以抗干信比为12 dB的干扰,并且在低信噪比下的性能优于传统算法。 相似文献
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近期,贵州广播电视台覆盖全省的2套调频同步广播节目FM94.6和FM95.2在全省各地州、市的覆盖区域陆续出现了收听效果断断续续、甚至收听不到节目的情况,经过实地故障排查,确定为5G新基站干扰导致,为此,分析5G基站信号对卫星信号的干扰,并提出相应的应对措施. 相似文献
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Ravandran Muttiah 《International Journal of Satellite Communications and Networking》2023,41(5):441-459
Satellite constellation design plays an important role in satellite networks. Network constellation system design can affect the effectiveness of current improvements of the communications link and the management of the entire network. The power requirement of the mobile stations and ground stations is very high in a geostationary Earth orbit communication system, which means the terrestrial terminal is hard to be made handheld for fifth generation mobile communications. The emergence of nongeostationary orbit satellites such as low Earth orbit satellites greatly compensates for the disadvantage of geostationary Earth orbit satellites. Based on the classical constellation design method, the orthogonal circular orbit constellation is proposed. The design objectives considered here are the following: global Earth coverage by low Earth orbit satellites, the duration of continuously covering one mobile station by one satellite is more than 9.57 min, the access satellite link duration time of the mobile station is more than 4.79 min, and the number of satellites and orbits is to be minimum. 相似文献