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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Zeitschriftenbeiträge:

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Meisam Mirahsan, Rainer Schoenen und Halim Yanikomeroglu
HetHetNets: Heterogeneous traffic distribution in heterogeneous wireless cellular networks
Journal on Selected Areas in Communications, Special Issue on Recent Advances in Heterogeneous Cellular Networks, 33(10):2252-2265
1 Oktober 2015

Marker: IuE

Zusammenfassung: ABSTRACT: A recent approach in modeling and analysis of the supply and demand in heterogeneous wireless cellular networks has been the use of two independent Poisson point processes (PPPs) for the locations of base stations (BSs) and user equipments (UEs). This popular approach has two major shortcomings. First, although the PPP model may be a fitting one for the BS locations, it is less adequate for the UE locations mainly due to the fact that the model is not adjustable (tunable) to represent the severity of the heterogeneity (non-uniformity) in the UE locations. Besides, the independence assumption between the two PPPs does not capture the often-observed correlation between the UE and BS locations. This paper presents a novel heterogeneous spatial traffic modeling which allows statistical adjustment. Simple and non-parameterized, yet sufficiently accurate, measures for capturing the traffic characteristics in space are introduced. Only two statistical parameters related to the UE distribution, namely, the coefficient of variation (the normalized second-moment), of an appropriately defined inter-UE distance measure, and correlation coefficient (the normalized cross-moment) between UE and BS locations, are adjusted to control the degree of heterogeneity and the bias towards the BS locations, respectively. This model is used in heterogeneous wireless cellular networks (HetNets) to demonstrate the impact of heterogeneous and BS-correlated traffic on the network performance. This network is called HetHetNet since it has two types of heterogeneity: heterogeneity in the infrastructure (supply), and heterogeneity in the spatial traffic distribution (demand).

pdf
Meisam Mirahsan, Rainer Schoenen, Halim Yanikomeroglu, Gamini Senarath und Ngoc Dung-Dao
User-in-the-loop for hethetnets with backhaul capacity constraints
IEEE Transactions on Wireless Communications,
1 Oktober 2015
english

Schlüsselwörter: wireless networks, stochastic geometry, user in the loop

Marker: IuE

Zusammenfassung: ABSTRACT: A popular method to model heterogeneous networks is the use of two independent homogeneous Poisson point processes to locate UEs and BSs with unlimited backhaul capacity. Despite the analytical tractability, this approach is far from accurate. First, the distribution of UEs in real scenarios is neither homogeneous nor independent of BSs. Besides, the assumption of unlimited capacity for backhaul connections is optimistic, especially in the future 5G HetNets with small cells. In this article, we propose a novel modeling approach for heterogeneous networks with heterogeneous spatial traffic distribution (HetHetNets). Specifically, in the proposed model, a particular ratio of UEs are collocated with the BSs while the rest of UEs are independently and homogeneously distributed in the network. Moreover, the proposed model presumes backhaul connections with constrained capacity. We study the impact of this more realistic network modeling on the effectiveness of the spatial user-in-the-loop (UIL) schemes in HetHetNets. Spatial UIL assumes that (some) UEs can be influenced by the operator to move in the network. Finally, we propose a new objective for the UIL mechanism that takes into account the impact of the BS loads and the backhaul capacities on the network performance.

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Tobias Markmann, Thomas C. Schmidt und Matthias Wählisch
Federated End-to-End Authentication for the Constrained Internet of Things using IBC and ECC
SIGCOMM Comput. Commun. Rev., 45(5):603-604
2015

Marker: TI-I

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Joerg Schwieger, Bernd Baumann, Marcus Wolff, Freddy Manders und Jos Suijker
Backcoupling of acoustic streaming on the temperature field inside high-intensity discharge lamps
Journal of Physics: Conference Series, 655(1):012045
2015

Marker: TI-MP

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Jorg Schwieger, Marcus Wolff, Bernd Baumann, Freddy Manders und Jos Suijker
Characterization of discharge arc flicker in high-intensity discharge lamps
Industry Applications, IEEE Transactions on, 51(3):2544--2547
2015

Marker: TI-MP

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D. Kästner, D. Büchtemann, I. Warnke, J. Radisch, J. Baumgardt, S. Giesberg, K. Kopke, J. Moock, W. Kawohl und W. Rössler
Clinical and functional outcome of assertive outreach for patients with schizophrenic disorder: Results of a quasi-experimental controlled trial
Eur Psychiatry, 30(6):736-42
2015

Marker: WS

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P. Stratmeyer und S. Meyer-Loos
Erfolgreiche Implementation eines professionellen Parodontitiskonzepts in die zahnärztliche Praxis.
Plaque N Care, 4:191-198
2015

Marker: WS

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R. Mores und G. Bissinger
Model-based auralizations of violin sound trends accompanying plate-bridge tuning or holding
The Journal of the Acoustical Society of America, 137(4):293-299
2015

Marker: DMI-Mt

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Bernd Baumann, Joerg Schwieger, Marcus Wolff, Freddy Manders und Jos Suijker
Nonlinear Behavior in High-Intensity Discharge Lamps
arXiv preprint arXiv:1510.03236,
2015

Marker: TI-MP

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Bernd Baumann, Joerg Schwieger, Marcus Wolff, Freddy Manders und Jos Suijker
Numerical investigation of symmetry breaking and critical behavior of the acoustic streaming field in high-intensity discharge lamps
Journal of Physics D: Applied Physics, 48(25):255501
2015

Marker: TI-MP

Zusammenfassung: For energy efficiency and material cost reduction it is preferred to drive high-intensity discharge lamps at frequencies of approximately 300 kHz. However, operating lamps at these high frequencies bears the risk of stimulating acoustic resonances inside the arc tube, which can result in low frequency light flicker and even lamp destruction. The acoustic streaming effect has been identified as the link between high frequency resonances and low frequency flicker. A highly coupled three-dimensional multiphysics model has been set up to calculate the acoustic streaming velocity field inside the arc tube of high-intensity discharge lamps. It has been found that the velocity field suffers a phase transition to an asymmetrical state at a critical acoustic streaming force. In certain respects the system behaves similar to a ferromagnet near the Curie point. It is discussed how the model allows to investigate the light flicker phenomenon. Concerning computer resources the procedure is considerably less demanding than a direct approach with a transient model.

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Letzte Änderung: 23.01.15

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