Searched for: department%3A%22Telecommunications%22
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Shenario Ezhil Valavan, A. (author)
doctoral thesis 2014
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Raghunathan, S.B. (author)
doctoral thesis 2013
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Lu, H. (author)
In this thesis, major attention is paid to cooperative diversity as an alternative way to achieve spatial diversity when the multiple antenna structure is not an option. By adopting the cooperative relay nodes to forward information, we can mitigate the fading effects, increase the capacity, lower the bit-error rate, increase the achievable...
doctoral thesis 2013
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Tamma, V.P. (author)
Information and Communication Technology (ICT) is changing the way we live and has become an essential part of our life. With the advent of Internet of Things (IoT), and Wireless Sensor Networks (WSN) in particular, the number of devices that are networked is increasing exponentially over the years. With the increase in number of ICT devices...
doctoral thesis 2012
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Raghunathan, S.B. (author), Schouten, H.F. (author), Visser, T.D. (author)
We demonstrate that coherence vortices, singularities of the correlation function, generally occur in partially coherent electromagnetic beams. In successive cross sections of Gaussian Schell-model beams, their locus is found to be a closed string. These coherence singularities have implications for both interference experiments and correlation...
journal article 2012
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Li, C. (author), Van de Bovenkamp, R. (author), Van Mieghem, P.F.A. (author)
We introduce the ?-susceptible-infected-susceptible (SIS) spreading model, which is taken as a benchmark for the comparison between the N-intertwined approximation and the Pastor-Satorras and Vespignani heterogeneous mean-field (HMF) approximation of the SIS model. The N-intertwined approximation, the HMF approximation, and the ?-SIS spreading...
journal article 2012
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Van Mieghem, P.F.A. (author), Cator, E. (author)
Since the Susceptible-Infected-Susceptible (SIS) epidemic threshold is not precisely defined in spite of its practical importance, the classical SIS epidemic process has been generalized to the ??SIS model, where a node possesses a self-infection rate ?, in addition to a link infection rate ? and a curing rate ?. The exact Markov equations are...
journal article 2012
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Raghunathan, S.B. (author), Gan, C.H. (author), Van Dijk, T. (author), Ea Kim, B. (author), Schouten, H.F. (author), Ubachs, W. (author), Lalanne, P. (author), Visser, T.D. (author)
We report a plasmon steering method that enables us to dynamically control the direction of surface plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to...
journal article 2012
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Trajanovski, S. (author), Scellato, S. (author), Leontiadis, I. (author)
The study of real-world communication systems via complex network models has greatly expanded our understanding on how information flows, even in completely decentralized architectures such as mobile wireless networks. Nonetheless, static network models cannot capture the time-varying aspects and, therefore, various temporal metrics have been...
journal article 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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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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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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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
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