ultra wide band-uwb-11

ultra wide band-uwb-11


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The evolution of ultra wide band radio for wireless personal area networks
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Ultra wideband (UWB) wireless networks are in their infancy, but are poised to become a valuable component of consumer electronics and computer equipment. The IEEE 802.15. 3a task group is currently developing a UWB standard that involves most of the major chip

Ultra wide band wireless communications: A tutorial
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ABSTRACT Ultra wide band (UWB) radio has recently attracted in-creased attention due to its expected unlicensed operation, and potential to provide very high data rates at relatively short ranges. In this article we briefly describe some main candidate multiple access and

A rate-adaptive MAC protocol for low-power ultra-wide band ad-hoc networks
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Recent theoretical results show that it is optimal to allow interfering sources to transmit simultaneously, as long as they are outside a well-defined exclusion region around a destination, and to adapt the rate to interference. In contrast, interference from inside the

UCAN s ultra wide band system: MAC and routing protocols
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ABSTRACT The European funded project UCAN (Ultra wide-band Concepts for Ad-hoc Networks) is in the process of designing and implementing an Ultra Wide Band (UWB) Impulse Radio (IR) single band communication system. This paper presents the MAC and

Ultra wide band pulse communications
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2001 ,dei.unipd.it 2 1. Introduction operate on an unlicensed spectrum. The topic of UWB is novel and there is still a wide space for research. In this context, the thesis investigates some aspects concerning the modulation format and spectral evaluation of UWB communications, and is

Time-hopping patterns derived from permutation sequences for ultra-wide-band impulse-radio applications
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ABSTRACT Time-hopping (TH) communication techniques have gathered increasing attention since the introduction of ultra-wide-band impulse-radio, by Scholtz, in 1993. In these systems, the design of TH sequences is a critical point, since they constitute the only

A wavelet packet based model for an ultra-wide-band indoor propagation channel
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ABSTRACT A sparse model for ultra-wide-band (UWB) indoor channel impulse response (CIR) based on wavelet packets is presented. The CIR is decomposed on wavelet packet basis functions resulting in scaling and wavelet coefficients. Hard thresholding is used to

Ultra wide-band baseband design and implementation
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This chapter will give some background about UWB communication. Since UWB communication makes use of an ultra-wide bandwidth, the first question would be how fast it could communicate. What kind of modulation should we use to approach this capacity?

An overview of modeling of ultra wide band indoor channels
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ABSTRACT In this paper an overview of the reported param-eters of the Ultra Wide Band (UWB) indoor wireless channel is presented. First, an introduction to UWB technology as well as UWB wireless channels is provided. Then, impulse response model for the

A Fixed-Tuned SIS Mixer with Ultra-Wide-Band IF and Quantum-Limited Sensitivity for ALMABand 3 (84-116 GHz) Receivers
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ABSTRACT This paper describes an 84-116 GHz Nb/Al-oxide/NbSIS mixer with multi-octave IF bandwidth and quantum-limited sensitivity. The mixer can be integrated with a three-stage 4- 12 GHz HFET preamplifier or fitted with a coaxial connector for operation with an external

Ultra wide band (UWB) of optical fiber Raman amplifiers in advanced optical communication networks
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In the present paper, we have analyzed numerically the ultra wide band (UWB) optical fiber Raman amplifiers in advanced optical communication networks. Moreover, we have developed the numerical transmission and propagation techniques based on

Ultra Wide Band (UWB) Technology and Applications
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• Low power, miniature, distributed position location ( Localizers ) and communication devices.• DARPA Projects (Defense Advanced Research Projects Agency) Intel (USA)(http://www. intel. com/technology/itj/q22001/articles/art_4. htm)• UWB for

A review of recent patents on ultra wide band (UWB) antennas
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ABSTRACT In this article, recent patents on UWB antennas are reviewed; different geometries, design parameters and their experimental results are discussed. Several types of UWB antennas including special horn, patch and array antennas in recent patents are

Single-mode optical fiber design with wide-band ultra low bending-loss for FTTH application
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ABSTRACT We propose a new design of a single-mode optical fiber (SMF) which exhibits ultra low bend sensitivity over a wide communication band (1.3 µm to 1.65 µm). A five-cladding fiber structure has been proposed to minimize the bending loss, estimated to be as low as

Ultra wide-band: State of the art; implementation of a performance-controllable low-noise amplifier
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ABSTRACT Ultra Wide-Band (UWB) transmissions exhibit performances vastly superior to existing wireless systems-superlative data-rate capacity, high security, low cost, low power consumption-and are emerging as the hottest topic of research for upcoming wireless

Antenna configurations for ultra wide band radar detection of breast cancer
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Ultra Wide Band (UWB) radar is a promising emerging technology for breast cancer detection that makes use of the dielectric contrast between normal and tumour tissues at microwave frequencies. An important consideration in UWB imaging system design is the

Signal processing issues in indoor positioning by ultra wide band radio aided inertial navigation
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ABSTRACT The difficulties and possibilities connected to indoor positioning suggest using several sources of navigational information. Apart from the signal processing of the individual sources this gives rise to the need for information fusion. This article aims at

Impact of ultra wide band (UWB) on macrocell downlink of DCS-1800 and GSM-900 systems
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ABSTRACT. The effect of UWB interference on the DCS-1800 and GSM-900 downlink is studied for different UWB power density. For high UWB power density (-70 dBm/MHz), the effect of UWB signals is very high when the distance between UWB transmitter and DCS-1800

MIMO diversity for ultra wide band communication
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ABSTRACT The development of Ultra Wide Band (UWB) communications is impeded by the drastic transmitted power limitations imposed by regulation authorities, due to the polluting character of these radio emissions with respect to existing services. Technical solutions

Ultra Wide Band (UWB) based precise positioning system for robotics
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ABSTRACT The advent of the Global Positioning System (GPS) provided reliable and accurate position information worldwide for outdoor environment. However, many applications are emerging where position information is required and the environment or

Ultra-wide band impulse radio (UWB-IR) with super-orthogonal turbo codes (sotc)
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ABSTRACT The performance of a direct-sequence ultra-wide-band (DS-UWB) system coded by super-orthogonal turbo codes (SOTC) over simulated UWB channels is studied in this work. The SOTC scheme is attractive due to its low rate and lowdecoding-complexity

Characterization of Ultra Wide Band Communications in Data Center Environments
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ABSTRACT In this paper, we present a measurement characterization of the Ultrawideband (UWB) channels in a data center environment and examine the accuracy of direct ranging using Time of Arrival (ToA) measurements. The expected deployment vehicle for UWB in

Ultra wide band WLANs: a self-configuring resource control scheme for accessing UWB hot-spots with QoS guarantees
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In the framework of wireless access networks the Hot-Spot concept is attracting several operators. In a Hot-Spot near stationary terminals may reach one or more Radio Access Points (RAP) offering wireless access to the fixed network. Mobile terminals should be

Interference Robustness and Security of Impulse-Radio Ultra-Wide Band Networks
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ABSTRACT In this thesis we study Impulse-Radio Ultra-Wide Band (IR-UWB), a physical layer radio technology offering many features that make it a promising choice for future short- range wireless networks. The challenges in such networks are many, ranging from the

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