共查询到19条相似文献,搜索用时 46 毫秒
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刘丹谱 《无线电技术与信息》2004,(7):15-20
无线技术在通信发展进程中一直扮演着重要角色。伴随着移动通信十几年来的蓬勃发展以及3G、B3G等概念的日益普及,无线家族中的另一成员——短距离宽带无线接入技术近年来异军突起。从蓝牙、HomeRF到IEEE802.11(即Wi—Fi)系列, 相似文献
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超宽带无线通信是一种采用脉冲调制的无线通信方式,具有高系统容量、良好的抗多径能力和低功耗低成本的特点。本文对无线通信技术的基本定义进行了阐述,重点介绍了其性能特点和研究现状,并讨论了其面临的机遇和挑战。 相似文献
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超宽带无线通信技术简介 总被引:3,自引:0,他引:3
本文首先介绍了超宽带(UWB)技术的定义及其频谱规划情况.分析了UWB的调制与多址技术,然后介绍了目前IEEE 802.15.3 SG3a建议使用的UWB路径损耗模型及多径信道模型,最后展望了UWB技术的应用前景及目前发展状况与需要进一步研究的问题。 相似文献
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超宽带无线通信及其关键技术 总被引:17,自引:1,他引:17
从超宽带(UWB)的特点出发,分析了它的应用潜力、国内外发展现状以及关键技术;同时指出,许多课题有待于我们去进一步研究、解决,包括规则标准、信号选择、抗干扰问题、发送接收技术、集成电路开发等;最后展望了UWB的发展前景。 相似文献
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UWB超宽带无线通信技术及其发展前景 总被引:5,自引:0,他引:5
本文首先介绍了超宽带技术的定义,描述了超宽带技术的特点和信道模型,阐述用于超宽带系统常用的多址方式和调制方式,给出了超宽带通信收发机结构,最后分析了国内外超宽带技术发展应用的前景。 相似文献
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广义超宽带技术(Ultra WindeBand,UWB)是指以极窄脉冲方式进行无线发射和接收的特种技术,其特殊之处在于完全摆脱了一般无线收发中必须采用载波调制的传统手段,成为在对域出直接操作的无线技术,因此也称作脉冲无线电(Impuise Radio),时域(Time Domain)或无载波(Carrier Free)无线电技术。 相似文献
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韩立锋 《无线电技术与信息》2005,(2):16-20
无线技术在通信发展进程中一直扮演着重要角色。伴随着移动通信十几年来的蓬勃发展以及3G、B3G等概念的日益普及,无线家族中的另一成员——短距离宽带无线接入技术近年来异军突起。UWB技术是一种与传统宽带无线接入技术有很大不同的无线通信技术,它能够实现无线局域网LAN和个人区域网(PAN)中无线接口的互联和接入,其特点是低功耗、高带宽、低复杂度。 相似文献
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本文介绍了超宽带技术和无线个域网的概念和基于超宽带技术的高速无线个域网的性能特点及应用,并与其他短距离无线通信方式进行了比较和技术评价,最后对它的局限性、问题和未来发展方向做了仔细分析。 相似文献
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超宽带(UWB)无线通信技术 总被引:3,自引:0,他引:3
介绍了UWB的概念、主要技术特点,并把UWB与目前较为广泛使用的IEEE802.11、bluetooth等短距离无线通信技术进行了比较,最后对UWB的应用前景进行了分析与展望。 相似文献
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A Review of Wavelets for Digital Wireless Communication 总被引:2,自引:1,他引:1
Wavelets have been favorably applied in almost all aspects of digital wireless communication systems including data compression, source and channel coding, signal denoising, channel modeling and design of transceivers. The main property of wavelets in these applications is in their flexibility and ability to characterize signals accurately. In this paper recent trends and developments in the use of wavelets in wireless communications are reviewed. Major applications of wavelets in wireless channel modeling, interference mitigation, denoising, OFDM modulation, multiple access, Ultra Wideband communications, cognitive radio and wireless networks are surveyed. The confluence of information and communication technologies and the possibility of ubiquitous connectivity have posed a challenge to developing technologies and architectures capable of handling large volumes of data under severe resource constraints such as power and bandwidth. Wavelets are uniquely qualified to address this challenge. The flexibility and adaptation provided by wavelets have made wavelet technology a strong candidate for future wireless communication.
Madan Kumar Lakshmanan was born in Chennai, India, in 1979. He received the B.E. (with distinction) in electrical engineering from the University of Madras, Chennai, India, in 2000. He joined the Indian Software firm, Polaris Software Labs Ltd., in 2000 where he wrote software for Telecommunication applications. At Polaris, he was awarded the “On The Spot Of Excellence Award” for his efforts. In 2003, he moved to the Indian Institute of Technology-Madras, to develop and establish a wireless communications network for rural connectivity. In 2004, he was awarded the Royal Dutch/Shell Chevning scholarship to pursue a Master degree in Telecommunications at the Delft University of Technology (TUDelft). At TUDelft he is affiliated to the International Research Center for Telecommunications-Transmission and Radar (IRCTR) where he is undertaking research in the field of wavelets applications in Wireless Communications.
Homayoun Nikookar received his Ph.D. in Electrical Engineering from Delft University of Technology (TUDelft), The Netherlands, in 1995. From 1995 to 1998 he was a postdoc researcher at the International Research Center for Telecommunications-Transmission and Radar, TUDelft, where since 1999 he has been an Assistant Professor. Dr. Nikookar has done research on different areas of wireless communications, including wireless channel modeling, UWB, MIMO, multicarrier transmission, Wavelet-based OFDM and CDMA. He is a senior member of the IEEE. 相似文献
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目前全国各地正在积极推广数字有线电视,其中如何开展各种增值业务成为一个重要课题。文章首先简要介绍了数字有线电视和超宽带技术,然后给出了两种超宽带技术在现有数字有线电视系统中的应用方案,利用这些方案可以有效地开展各项增值业务。 相似文献
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如何利用现有的数字CATV系统开展各种增值业务已成为一个重要课题.首先简要介绍了数字CATV和超宽带技术,然后给出了两种超宽带技术在现有数字CATV系统中的应用方案,利用这些方案可以有效地开展各项增值业务. 相似文献
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