Searched for: department%3A%22Telecommunications%22
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Carrer, L. (author)
In the last years, there has been a renewed interest in security applications designed to detect potentially dangerous concealed object carried by an individual. In particular automatic detection and classification of concealed weapons is a fundamental part of every surveillance system.Until now merely all the research in image processing for...
master thesis 2012
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Pang, X. (author), Fischer, D.G. (author), Visser, T.D. (author)
The Gouy phase, sometimes called the phase anomaly, is the remarkable effect that in the region of focus a converging wave field undergoes a rapid phase change by an amount of ?, compared to the phase of a plane wave of the same frequency. This phenomenon plays a crucial role in any application where fields are focused, such as optical coherence...
journal article 2012
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Kalyanasundaram, P. (author), Huang, L. (author), Dolmans, G. (author), Imamura, K. (author)
Super-regenerative receiver is one of the potential candidates to achieve ultra low power wireless communication in body area network (BAN). The main limitations of the super-regenerative receiver include the difficulty in choosing a good quench waveform to optimize its sensitivity and selectivity, and its significantly degraded performance in...
conference paper 2012
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Zhang, N. (author)
The Wireless Lighting Control System has drawn intensive attention in the recent years due to the potential for huge cost savings as well as increased convenience. Commonly seen Wireless Lighting Control Systems utilize Zigbee, KNX and Z-WAVE; whereas little attention has been given to Wi-Fi because of unsolved limitations. The purpose of this...
master thesis 2012
document
Di Girolamo, P. (author), Summa, D. (author), Cacciani, M. (author), Norton, E.G. (author), Peters, G. (author), Dufournet, Y. (author)
Multi-wavelength lidar measurements in the melting layer revealing the presence of dark and bright bands have been performed by the University of BASILicata Raman lidar system (BASIL) during a stratiform rain event. Simultaneously radar measurements have been also performed from the same site by the University of Hamburg cloud radar MIRA 36 (35...
journal article 2012
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Verboon, T. (author)
To explore the question whether a promising concept that supports a UAV operator in separating the UAV from other traffic, also has potential benefits for Air Traffic Control, an identification and analysis of possibilities to add the conflict probing function to an existing Air Traffic Control system, the Multi-Aegis Site Emulator, was...
master thesis 2012
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Lian, X. (author), Nikookar, H. (author), Ligthart, L.P. (author)
Cognitive radio (CR) is an intelligent radio system and is able to share the spectrum with licensed users (LU). By adopting adaptive beam forming techniques, CR can reuse the spectrum with LU via directing main beams towards CR users while displaying nulls towards LU. In this article, we present a new distributed beam forming (DB) technique, and...
journal article 2012
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Van Genderen, P. (author), Krasnov, O.A. (author), Wang, Z. (author), Tigrek, R.F. (author)
Retrieval of cloud parameters in weather radar benefits from polarimetric measurements. Most polarimetric radars measure the full backscatter matrix (BSM) using a few alternating polarized sounding signals. Using specially encoded orthogonal frequency division multiplexing (OFDM) signals however, the BSM can be measured in a single simultaneous...
journal article 2012
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Cetin, H. (author)
The demand for wireless services and the need for high data-rates are growing rapidly. Future generation networks are expected to provide high data-rates in the order of 1Gbps in local area and 100Mbps in wide area. It is a challenge for operators to meet this rising demand for high data-rates as the radio-spectrum is an expensive and scarce...
master thesis 2012
document
Pasqua, E. (author)
Current methods for concealed weapon detection are mainly used at stationary security check-points due to complexity and other serious limitations for real-time outdoor scenarios. A mobile imaging radar is considered as a proper solution for fast screening of people at mass events because of its ability to detect both metal and non-metal weapons...
master thesis 2012
document
Ge, X. (author), Wang, H. (author)
Many networks are characterized by the presence of communities, densely intra-connected groups with sparser inter-connections between groups. We propose a community overlay network representation to capture large-scale properties of communities. A community overlay Go can be constructed upon a network G, called the underlying network, by (a)...
journal article 2012
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Weber, J.H. (author), Schouhamer Immink, K.A. (author), Ferreira, H.C. (author)
Knuth's celebrated balancing method consists of inverting the first z bits in a binary information sequence, such that the resulting sequence has as many ones as zeroes, and communicating the index z to the receiver through a short balanced prefix. In the proposed method, Knuth's scheme is extended with error-correcting capabilities, where it is...
conference paper 2011
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Lu, H. (author), Xu, T. (author), Nikookar, H. (author), Ligthart, L.P. (author)
In this paper, we investigate the diversity, capacity and complexity issues of cooperative Zero-Padding (ZP)-Orthogonal FrequencyDivisionMultiplexing (OFDM) communication. We consider cooperative ZP-OFDM communication over a multipath Rayleigh channel and with multiple Carrier Frequency Offsets (CFOs) existing at different relays. We use a...
journal article 2011
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Caratelli, D. (author), Yarovoy, A. (author)
Ground-penetrating radar (GPR) technology finds applications in many areas such as geophysical prospecting, archaeology, civil engineering, environmental engineering, and defence applications as a non-invasive sensing tool [3], [6], [18]. One key component in any GPR system is the receiver/transmitter antenna. Desirable features for GPR antennas...
book chapter 2011
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Van Mieghem, P.F.A. (author), Blenn, N. (author), Doerr, C. (author)
We analyse the number of votes, called the digg value, which measures the impact or popularity of submitted information in the Online Social Network Digg. Experiments over five years indicate that the digg value of a story on the first frontpage follows closely a lognormal distribution. While the law of proportionate effect explains lognormal...
journal article 2011
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Amaldoss, S.E. (author), Yarovoy, A. (author)
The effectiveness of a cavity for dual-band patch radiator with a frequency ratio of 1.65:1 is analysed. The use of cavities can help in maintaining impedance matching, reducing the levels of mutual coupling between the elements as well as in containing the surface waves, aspects vital to array performance. Results demonstrate that with the use...
conference paper 2011
document
Van Mieghem, P.F.A. (author)
Serious epidemics, both in cyber space as well as in our real world, are expected to occur with high probability, which justifies investigations in virus spread models in (contact) networks. The N-intertwined virus spread model of the SIS-type is introduced as a promising and analytically tractablemodel of which the steady-state behavior is...
journal article 2011
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Van Kester, S. (author), Xiao, T. (author), Kooij, R.E. (author), Brunnstrom, K. (author), Ahmed, O.K. (author)
This paper studies the impact of freezing of video on quality as experienced by users. Two types of freezes are investigated. First a freeze where the image pauses, so no frames were lost (frame halt). In the second type of freeze, the image freezes and skips that part of the video (frame drop). Measuring Mean Opinion Score (MOS) was done by...
journal article 2011
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Lian, X. (author), Nikookar, H. (author), Ligthart, L.P. (author)
In this paper, we introduce Adaptive Beamforming (AB) and Distributed Beamforming (DB) as two efficient techniques for IntelligentWiMAX (I-WiMAX). I-WiMAX is a new maritime communication system, consisting of Smart Radio (SR) principles and mobile WiMAX based on the IEEE 802.16e standard. Adopting AB, the same spectrum can accommodate more users...
journal article 2011
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Li, C. (author), Wang, H. (author), De Haan, W. (author), Stam, C.J. (author), Van Mieghem, P.F.A. (author)
An increasing number of network metrics have been applied in network analysis. If metric relations were known better, we could more effectively characterize networks by a small set of metrics to discover the association between network properties/metrics and network functioning. In this paper, we investigate the linear correlation coefficients...
journal article 2011
Searched for: department%3A%22Telecommunications%22
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