Searched for: department%3A%22Telecommunications%22
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De Hoop, A.T. (author), Abubakar, A. (author), Habashy, T.M. (author)
The contrast-source stress-velocity integral-equation formulation of three-dimensional time-domain elastodynamic scattering problems is discussed. A novel feature of the formulation is a tensor partitioning of the relevant dynamic stress and the contrast source volume density of deformation rate. The partitioning highlights several features...
journal article 2009
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Juffermans, R.A.P. (author)
As our dependency on communication increases so is the demand for protecting these communication lines. To provide failure-safe connections in optical networks, lightpaths can be protected. Protected lightpaths consist of a primary path and a backup path which are disjoint and ensure connection continuity in case of a single link failure....
master thesis 2009
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Wang, H. (author)
Our society depends more strongly than ever on large networks such as transportation networks, the Internet and power grids. Engineers are confronted with fundamental questions such as “how to evaluate the robustness of networks for a given service?”, “how to design a robust network?”, because networks always affect the functioning of a service....
doctoral thesis 2009
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Khan, M.N. (author)
The main target of a 60 GHz transceiver system is to obtain data rates close to gigabits per second (Gbps) over short distances. The 60 GHz suffers from severe pathloss, inter-symbol interference (ISI) and a limited link budget. In order to improve the link budget, beamforming techniques are utilized. Antenna beamforming, i.e., combining signals...
master thesis 2009
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Gishkori, S.S. (author)
Efficiency of the Analog to Digital Converters (ADCs) has always been an issue of concern, especially, when it comes to sampling wide band signals which require extremely high sampling rates. As the systems with wide band signals are gaining the front position in digital communications, the need to find ways to reduce the sampling rates of ADCs...
master thesis 2009
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Cui, X. (author)
Based on IEEE 802.15.4, ZigBee is developed for low-power and low-data-rate wireless communication and it is building up remarkable position for wireless sensor network (WSN). As ZigBee is using the 2.4GHz Industrial, Scientific, and Medical (ISM) unlicensed frequency band, coexistence issues arise as there are also other wireless technologies...
master thesis 2009
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Ariananda, D.D. (author)
One of the important functionalities of Dynamic Spectrum Access is spectrum estimation. Accuracy and speed of estimation are the key indicators to select the appropriate spectrum estimation technique. In this thesis work, the possibility of employing wavelet packet decomposition as a basis for a new spectrum estimation approach is investigated....
master thesis 2009
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Dabbagh, H. (author)
master thesis 2009
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De Hoop, A.T. (author), Jiang, L. (author)
The response of a thin, high-contrast, finely layered structure with dielectric and conductive properties to an incident, pulsed, electromagnetic field is investigated theoretically. The fine layering causes the standard spatial discretization techniques to solve Maxwell's equations numerically to be practically inapplicable. To overcome this...
journal article 2009
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Lager, I.E. (author), Trampuz, C. (author), Simeoni, M. (author), Ligthart, L.P. (author)
An effective and robust strategy for concurrently designing the transmit and receive antennas of a frequency-modulated, continuos-wave radar is discussed. The aperture architecture is based on the use of non-periodic, interleaved sub-arrays. Deterministic element placement is employed for ensuring design efficiency. The procedure yields...
journal article 2009
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He, J. (author)
Wireless Sensor Network (WSN) is becoming a more and more popular research area since its emergence. Many WSN researches rely on practical experiments in real wireless networks. However, to setup and conduct such an experiment is always cumbersome and time-consuming. So in this thesis, we design and implement a WSN testbed to solve the problem...
master thesis 2009
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Hawas, M. (author)
In this project we have investigated how to enable dependable routing inside personal network (PN )cluster.Dependable routing among different clusters is out of the scope of this thesis.In practice, personal network cluster is considered as mobile ad-hoc network (MANET) with heterogeneous radioaccess technologies and nodes with different...
master thesis 2009
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Simmonds, C. (author)
Today’s Telecom sectors’ implementations seem to be sub optimal and might even end up out of control because of the multiple implementation of technological and process functionalities, and dominant financial focus that complicates removing legacy networks. Even though, there is support for fulfilling customer needs, the inefficient use of...
master thesis 2009
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Adejuwon, A.O. (author)
It has been widely recognized that the valuable, yet finite radio spectrum is being underutilized by licensed systems both spatially and temporally. To realize a more efficient use of this valuable resource, secondary spectrum usage by cognitive radios is being considered. Cognitive Radio is a paradigm for wireless communication in which either...
master thesis 2009
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Tanyer-Tigrek, F.M. (author), Tran, D.P. (author), Lager, I.E. (author), Ligthart, L.P. (author)
An optimized coplanar waveguide fed quasimagnetic printed antenna for ultra wideband applications is described. A parameter study, motivated by a design procedure, allowed a substantial increase in the return-loss operational bandwidth. The numerically predicted performance was validated by means of physical measurements of fabricated samples....
journal article 2009
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Ngo, M.T. (author)
Most decoding algorithms of linear codes, in general, are designed to correct or detect errors. However, many channels cause erasures in addition to errors. In principle, decoding over such channels can be accomplished by deleting the erased symbols and decoding the resulting vector with respect to a punctured code. For any given linear code and...
master thesis 2009
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Godana, B.E. (author)
Human activity characterization based on gait signatures is important in several applications including medical, elderly care, police, biometric identification, etc. Cameras and on-body accelerometers are widely investigated for characterizing human activity. Nonetheless, in order to achieve wide acceptance, sensors to be used for these...
master thesis 2009
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Bokiye, A.M. (author)
The demand for high data rate is ever increasing. OFDM-based wideband systems such as LTE and WiMAX are being employed as they can provide such high data rates. The performances of these systems not only depend on SNR but also on wideband arameters such as delay spread and angular spread. Obstacles (buildings, trees, vehicles, lamp posts, etc.)...
master thesis 2009
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Yukang, T. (author)
In oil and gas exploration, seismic arrays are deployed by geophycisists to image the subsurface. For passive seismic applications, the data recorded by the sensor array may contain velocity and angle information of the propagating seismic wave. This information can be used to infer the properties of material in different earth layers. In order...
master thesis 2009
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Doost Mohammady, R. (author)
Cognitive Radios are currently a big challenge for the telecommunications industry. Many efforts are in progress to make communication radio systems as adaptive as possible such that they are aware of their environment and they are self configurable. An ultimate adaptive radio with the specified features is used to be called a Cognitive Radio. A...
master thesis 2009
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