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736 results on '"Ghassemlooy, Z."'

56. An Overview of Optical Wireless Communications

Author

Ghassemlooy, Z, Uysal, M, Khalighi, M A, Ribeiro, V, Moll, Florian, and Belmonte, A

Subjects
optical wireless communications, introduction, review, Laser communication, free-space optical communications, overview
Published
2016

61. An overview of optical wireless communications

Author

Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Ghassemlooy, Z., Uysal, M., Khalighi, M. A., Ribeiro, V., Moll, F., Zvanovec, Z., Belmonte Molina, Aniceto, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Ghassemlooy, Z., Uysal, M., Khalighi, M. A., Ribeiro, V., Moll, F., Zvanovec, Z., and Belmonte Molina, Aniceto

Abstract

Peer Reviewed, Postprint (published version)

Published
2016

75. Indoor free space optics link under the weak turbulence regime: measurements and model validation

Author

Universitat Politècnica de València. Instituto Universitario de Telecomunicación y Aplicaciones Multimedia - Institut Universitari de Telecomunicacions i Aplicacions Multimèdia, Ministerio de Economía y Competitividad, European Space Agency, European Cooperation in Science and Technology, Pernice, Riccardo, Ando, Andrea, Cardinale, Marzia, Curcio, Luciano, Stivala, Salvatore, Parisi, Antonino, Busacca, Alessandro C., Ghassemlooy, Z., Perez, Joaquin, Universitat Politècnica de València. Instituto Universitario de Telecomunicación y Aplicaciones Multimedia - Institut Universitari de Telecomunicacions i Aplicacions Multimèdia, Ministerio de Economía y Competitividad, European Space Agency, European Cooperation in Science and Technology, Pernice, Riccardo, Ando, Andrea, Cardinale, Marzia, Curcio, Luciano, Stivala, Salvatore, Parisi, Antonino, Busacca, Alessandro C., Ghassemlooy, Z., and Perez, Joaquin

Abstract

This paper is a postprint of a paper submitted to and accepted for publication in [journal] and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library, In this study, the authors present the measurements performed on a free space optics (FSO) communications link using an indoor atmospheric chamber. In particular, the authors have generated several different optical turbulence conditions, demonstrating how even the weak turbulence regime can strongly affect the FSO link performance. The authors have carried out an in-depth analysis of the data collected during the measurements, and calculated the turbulence strength (i.e. scintillation index and Rytov variance) and the important performance metrics (i.e. the Q-factor and bit error rate) to evaluate the FSO link quality. Moreover, the authors have tested, for the first time, an appositely developed temporally-correlated gamma-gamma channel model to generate the temporal irradiance fluctuations observed at the receiver. This has been accomplished by using a complete analysis tool that enables the authors to fully simulate the experimental FSO link. Finally, the authors compare the generated time-series with the collected experimental data, showing a good agreement and thus proving the effectiveness of the model.

Published
2015

77. Modelling and analysis of FSO ground-to-train communications for straight and curved tracks

Author

Paudel, R., Poliak, J., Ghassemlooy, Z., and Erich Leitgeb

Subjects
H600
Abstract

In this work, a free space optical (FSO) link for the ground-to-train communications is proposed. Analytical analysis is carried out for the case of the straight as well as curved rail tracks. We show that the transmitter divergence angle, the transmit power and the size of the concentration lens needs to increase for the curved section of the rail track compared to the straight track. We derive the analytical expression (11) for the received power level based on the link geometry for the cases of straight and curved tracks. The received power variation is compared for two cases showing a similar dynamic range. In the worst case scenario when the radius of curvature is 120 m, the transmit power at the optical base station (OBS) needs to increase by over 2 dB when the concentration lens radius is increased by 5 times. Analyses also show that received power increases with the radius of curvature. Finally, results are compared with the existing straight track model.

Published
2013

79. A European view on the next generation optical wireless communication standard

Author

Jungnickel, V., primary, Uysal, M., additional, Serafimovski, N., additional, Baykas, T., additional, O'Brien, D., additional, Ciaramella, E., additional, Ghassemlooy, Z., additional, Green, R., additional, Haas, H., additional, Haigh, P. A., additional, Gil Jimenez, V. P., additional, Miramirkhani, F., additional, Wolf, M., additional, and Zvanovec, S., additional

Published
2015
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90. 10 Mb/s visible light transmission system using a polymer light-emitting diode with orthogonal frequency division multiplexing

Author

Le, Son T., Kanesan, T., Bausi, F., Haigh, P.A., Rajbhandari, S., Ghassemlooy, Z., Papakonstantinou, I., Popoola, W.O., Burton, A., Le Minh, H., Cacialli, F., Ellis, A.D., Le, Son T., Kanesan, T., Bausi, F., Haigh, P.A., Rajbhandari, S., Ghassemlooy, Z., Papakonstantinou, I., Popoola, W.O., Burton, A., Le Minh, H., Cacialli, F., and Ellis, A.D.

Abstract

We present a newly designed polymer light-emitting diode with a bandwidth of ∼350 kHz for high-speed visible light communications. Using this new polymer light-emitting diode as a transmitter, we have achieved a record transmission speed of 10 Mb/s for a polymer light-emitting diode-based optical communication system with an orthogonal frequency division multiplexing technique, matching the performance of single carrier formats using multitap equalization. For achieving such a high data-rate, a power pre-emphasis technique was adopted.

Published
2014

91. A 10 Mb/s visible light communication system using a low bandwidth polymer light-emitting diode

Author

Haigh, P.A., Bausi, F., Kanesan, T., Le, S.T., Rajbhandari, S., Ghassemlooy, Z., Papakonstantinou, I., Popoola, W.O., Burton, A., le Minh, H., Ellis, A.D., Cacialli, F., Haigh, P.A., Bausi, F., Kanesan, T., Le, S.T., Rajbhandari, S., Ghassemlooy, Z., Papakonstantinou, I., Popoola, W.O., Burton, A., le Minh, H., Ellis, A.D., and Cacialli, F.

Abstract

In this paper we experimentally demonstrate a 10 Mb/s error free visible light communications (VLC) system using polymer light-emitting diodes (PLEDs) for the first time. The PLED under test is a blue emitter with ∼600 kHz bandwidth. Having such a low bandwidth means the introduction of an intersymbol interference (ISI) induced penalty at higher transmission speeds and thus the requirement for an equalizer. In this work we improve on previous literature by implementing a decision feedback equalizer, rather than a linear equalizer. Considering 7% and 20% forward error correction codes, transmission speeds up to ∼12 Mb/s can be supported.

Published
2014

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