共查询到18条相似文献,搜索用时 250 毫秒
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颉斌 《电信工程技术与标准化》2021,34(3)
5G相比4G,网络容量更大、峰值速率更快、连接数量更多,但几十Gbps的峰值速率、10Tbps/Km2的流量密度,仅仅依靠目前分配的中、低频段,最大100MHz的带宽是根本无法实现的。毫米波利用其丰富的频谱资源,能很好的满足5G连续大带宽频频需求。本文对毫米波在无线通信中的优劣势进行分析,并介绍毫米波在5G中的应用场景,最后通过测试结论证明通过使用毫米波提高系统速率、容量的可行性。 相似文献
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随着通信产业尤其是移动通信的高速发展,无线电频谱的低端频率已趋饱和。采用各种调制方法或多址技术扩大通信系统的容量,提高频谱的利用率,也无法满足未来通信发展的需求,因而实现高速、宽带的无线通信势必向微波高频段开发新的频谱资源。毫米波由于其波长短、频带宽,可以有效地解决高速宽带无线接入面临的许多问题,因而在短距离无线通信中有着广泛的应用前景。各种半导体器件是信息和通信技术(ICT)的硬件基础,创造性研发满足毫米波无线通信应用的新兴半导体技术和电路,是提升通信系统容量、解决构建新一代通信系统关键问题的主要技术推手。文章沿着毫米波半导体器件技术创新发展脉络,从相控阵等关键技术的系统架构、半导体材料和工艺、器件设计和封装测试入手,分析总结了第五代(5G)、第六代(6G)移动通信技术毫米波系统和器件技术发展趋势。以美国DARPA的MIDAS计划为例,阐释了军用毫米波器件技术的研究前沿和进展。 相似文献
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随着时代的高速发展,人们对于通信质量和高速率、大流量的要求更加迫切,毫米波无线通信被认为将成为未来无线网络中最有前景的技术。文章介绍了毫米波无线通信的相关概念,分析了毫米波无线通信系统的优缺点,并针对系统中的阻塞现象和中继技术开展研究,最后展望了毫米波无线通信的产业应用。 相似文献
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全双工光纤无线通信系统中的关键技术研究 总被引:3,自引:3,他引:0
将光纤通信技术应用于无线通信网络而构成的光纤无线通信系统,已成为当前学术界研究的热点.文章首先概述了光纤无线通信系统的基本结构和特点,然后详细介绍了光纤无线通信系统中的一些关键技术.通过对光毫米波信号的产生方法和无源基站设计的研究,介绍了一种新的全双工ROF系统,并进一步分析了色散对光毫米波ROF通信的影响.最后展望了光纤无线通信技术的应用前景. 相似文献
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鉴于无线通信系统是轨道交通智能化升级改造的关键,首先分析了轨道交通无线通信的特征和面临的挑战,在此基础上,结合机器学习、毫米波、D2D通信等新兴的信息技术,提出了基于机器学习的信道建模方法、基于生成对抗网络(Generative Adversarial Network,GAN)的信道估计、毫米波波束切换和动态功率分配方案以及基于多智能体深度强化学习智能频谱共享方案,为智能轨道交通中无线通信应用提供解决方案;最后,展望未来智能轨道交通中无线通信技术的发展方向。 相似文献
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为了满足人们日益增长的数据流量需求,未来无线通信系统将向更小的小区部署迁移。小蜂窝网络是下一代无线通信系统的关键技术,也是适应未来更加复杂通信环境的有效途径。首先介绍了小蜂窝网络的基本概念,论述了其主要的技术特点和独特的应用优势,分析了其在未来无线通信系统中与其他各种技术可能的融合场景并讨论了对应的特点和存在的难题;然后概述了小蜂窝网络技术发展过程中所面临的主要挑战,分析了目前主要的研究成果和解决方案;最后,结合下一代无线通信的关键技术,如大规模多输入多输出通信、毫米波通信、D2D(Device-to-Device)通信和认知无线电技术等,总结了小蜂窝网络的应用现状并分析了其市场和发展前景。 相似文献
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The future generations of mobile communications based on broadband access technologies 总被引:17,自引:0,他引:17
The forthcoming mobile communication systems are expected to provide a wide variety of services, from high-quality voice to high-definition videos, through high data rate wireless channels anywhere in the world. The high data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band, and millimeter-wave. Broadband wireless channels have to be connected to broadband fixed networks such as the Internet and local area networks. The future-generation systems will include not only cellular phones, but also many new types of communication systems such as broadband wireless access systems, millimeter-wave LANs, intelligent transport systems, and high altitude stratospheric platform station systems. Key to the future generations of mobile communications are multimedia communications, wireless access to broadband fixed networks, and seamless roaming among different systems. This article discusses future-generation mobile communication systems. 相似文献
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Short-Range Wireless Communications for Next-Generation Networks: UWB, 60 GHz Millimeter-Wave WPAN, And ZigBee 总被引:4,自引:0,他引:4
This article presents standardization, regulation, and development issues associated with short-range wireless technologies for next-generation personal area networks (PAN). Ultra-wideband (UWB) and 60 GHz millimeter-wave communication technologies promise unprecedented short-range broadband wireless communication and are the harbingers of multigigabit wireless networks. Despite the huge potential for PAN, standardization and global spectrum regulations challenge the success of UWB. On the other hand, ZigBeetrade is expected to be a crucial short-range technology for low throughput and ultra low-power consumption networks. The current status and direction of future development of UWB, emerging 60 GHz millimeter-wave PAN, and low data rate ZigBee are described. This article also addresses wireless MAC protocol issues of 60 GHz multigigabit PAN. 相似文献
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Telecommunication Systems - Integration of optical and millimeter-wave systems provide a promising solution for future giga-bits per second wireless communication systems. We have proposed and... 相似文献
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Yong Zhang 《中国电子科技》2011,9(1)
Millimeter-wave radio-over-fiber technology demonstrates the potential for providing wireless broad-band service in the next generation wireless communication system.Optical generation of millimeter-wave signal is one of the most important technologies of millimeter-wave radio-over-fiber system.The virtues and shortcomings of some ways of optical generation of millimeter-wave signal are discussed.Then optical millimeter-wave signal transmission performance is described.Finally,an overview of the millimeter-wave radio-over-fiber system is given.It is suggested that the millimeter-wave radio-over-fiber technology should be paid more attention,especially for modulators for optical generation of millimeter-wave signal and radio-over-fiber system. 相似文献
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This paper presents an analysis and validation by advanced system simulation of compact and low-cost six-port transceivers for future wireless local area networks (WLANs) operating at millimeter-wave frequencies. To obtain realistic simulation results, a six-port model based on the measurement results of a fabricated V-band hybrid coupler, the core component, is used. A frequency-division multiplexing scheme is used by introducing four quadrature phase-shift keying (QPSK) channels in the wireless communication link. The data rate achieved is about 4 Gbit/s. The operating frequency is in the 60-64 GHz unlicensed band. Bit error rate (BER) results are presented, and a comparison is made between single-carrier and multicarrier architectures. The proposed wireless system can be considered an efficient candidate for millimeter-wave communication systems operating at quasi-optical data rates. 相似文献
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毫米波技术和无线传感器网络是目前各国研究的热点。随着毫米波器件的发展,使得其应用于无线传感器网络成为可能。从国内外公开发表的文献资料来看,这项应用虽然不甚成熟,但是其发展潜力巨大,有很多复杂问题有待研究解决。简要阐述了毫米波通信技术在无线传感器网络,特别是军用无线传感器网络中应用所具有的优势,对需要进一步解决的问题进行了研究分析。 相似文献
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The forthcoming mobile communication systems are expected to provide much variety of services from high quality voice to high definition videos through high data rate wireless channels at anywhere in the world. High data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band and millimeter-wave. Broadband wireless channels have to be connected to broadband fixed networks such as the Internet and local area networks. The future generation systems will include not only cellular phones, but also many new types of communication systems such as broadband wireless access systems, millimeter-wave LAN, intelligent transport systems (ITS) and high altitude stratospheric platform station (HAPS) systems. The key words in the future generations of mobile communications are multimedia communications, wireless access to broadband fixed networks and seamless roaming among different systems. This article discusses the future generations mobile communication systems. 相似文献