Results 161 to 170 of about 23,679 (186)
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Ultra-wideband (UWB) communications systems: an overview
The 3rd International IEEE-NEWCAS Conference, 2005., 2005This paper presents an overview of the ultra-wideband (UWB) technology for wireless communications systems. Following a brief review of the UWB basic principles, the characteristics of application specific UWB wireless systems are described. Design principles and challenges of UWB wireless systems, with an emphasis on monolithic implementations are ...
T.K.K. Tsang, M.N. El-Gamal
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Ultra-Wideband (UWB) Filter With WLAN Notch
2006 European Microwave Conference, 2006Strong narrowband signals like WLAN links may severely disturb UWB communication or sensor systems. In some cases, filtering out the respective frequency bands may therefore be of interest. This contribution proposes an additional notch filter within the passband of a broadband filter normally used to tailor the UWB spectrum. To this extent, a resonant
Wolfgang Menzel, Peter Feil
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A novel ultra-wideband (UWB) pulse transmitting scheme
IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004, 2005A novel pulse transmitting scheme is proposed based on the integration of RF modulators into a resonant antenna. Driven by the modulating signals, the modulators are able to modulate on the antenna radiation slots directly. Therefore narrow pulse sequences can be generated and radiated out simultaneously. Furthermore.
null Weijun Yao, Y.E. Wang
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RF Aspects in Ultra-WideBand (UWB) Technology
2012The chapter focuses on radio frequency aspects in UWB and is organised into four sections: the first section briefly summarises the main aspects about regulation issues of UWB technology; the second section describes antenna design and characterisation; the third section discusses UWB channel modelling and measurements; the last section describes ...
Adamiuk, G. +8 more
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Ultra Wideband (UWB) Interference on UMTS Receivers
2007 2nd International Symposium on Wireless Pervasive Computing, 2007This paper discusses the effects of impulse radio ultra wideband (UWB) interference on narrowband radio systems. It presents the fundamental mathematical modeling of the interaction between the UWB signal and the narrowband victim receiver. Further, as an example, it demonstrates the effects of UWB interference on a UMTS receiver through simulations ...
Gustavo Nader, Annamalai Annamalai
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A four-element Ultra Wideband (UWB) diversity antenna
2010 IEEE Antennas and Propagation Society International Symposium, 2010Since the approval of Federal Communication Committee (FCC) [1], Ultra Wideband (UWB) technology has become the popular research topic in the domain of wireless communications. However, very low transmitted power is allowed to avoid the interference with other existing wireless standards, consequently it limits to attain high capacity or data transfer ...
A I Najam, Y Duroc, S Tedjini
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Transmission and Reception by Ultra-Wideband (UWB) Antennas
IEEE Antennas and Propagation Magazine, 2006Broadband antennas are very useful in many applications because they operate over a wide range of frequencies. The objective of this paper is to study the transient responses of various well-known antennas over broad frequency ranges. As such, the phase responses of these antennas as a function of frequency are of great interest.
D. Ghosh +5 more
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Ultra Wideband Funktechnik (UWB) [PDF]
, 2008 Um eine Vielzahl von Funkstrecken störungsfrei betreiben zu können, sind eine komplexe Technik und ein gut geplantes Frequenzmanagement zwingend notwendig. Da wird es Zeit, über Alternativen nachzudenken. Eine dieser Alternativen ist die Ultra Wideband-Technik - kurz UWB - mit der eine neue Ära der drahtlosen Mikrofonübertragung möglich werden kann ...
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Slightly Frequency-Shifted Reference Ultra-Wideband (UWB) Radio
IEEE Transactions on Communications, 2007A promising ultra-wideband (UWB) radio technique being widely considered for low-data-rate applications, such as those often encountered in sensor networks, is the transmitted reference (TR) UWB scheme. However, the standard TR-UWB scheme, while often motivated by the simplicity of its receiver, is still dogged by implementation concerns. In particular,
Goeckel, DL, Zhang, Q
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Challenges for ultra-wideband (UWB) CMOS integration
IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2003, 2003Various methods of utilizing the UWB spectrum have been developed to date, characterized by specific modulation schemes, such as pulse position, pulse amplitude or bi-phase modulation. A new method emerging today utilizes a multi-band approach, where information is encoded in multiple RF subbands at staggered time, each occupying 500 MHz bandwidth.
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