Browsing by Author "Yiannopoulos, K."

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    Optimal combiners in optical wireless systems with spatial diversity and pre-amplification
    (IEEE, 2016) Yiannopoulos, K.; Sagias, N. C.; Boucouvalas, A. C.; Uysal, Murat; Ghassemlooy, Z.; Electrical & Electronics Engineering; UYSAL, Murat
    We present analytical results on the operation of a pre-amplified optical wireless communication (OWC) system that also takes advantage of spatial diversity to improve its outage probability and average bit-error-rate (BER) performance against turbulence induced fading. The paper focuses on the design of an optimal electronic combiner that minimizes the instantaneous BER for any given channel state by properly adjusting the gains that are provided to each receiver output after detection. We demonstrate that the optimal combiner performs in a similar manner to an equal gain combiner for a limited number of receiving elements in moderate turbulence, while its potential can be harvested in systems with high diversity factors or under the strong-to-saturated turbulence regime.
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    Standards for indoor optical wireless communications
    (IEEE, 2015-03) Boucouvalas, A. C.; Chatzimisios, P.; Ghassemlooy, Z.; Uysal, Murat; Yiannopoulos, K.; Electrical & Electronics Engineering; UYSAL, Murat
    The application of Optical Wireless Communications (OWC) has grown in recent years that the whole industry would benefit from common standards to which competitive products comply. Standards are essential, particularly when the market expands into high-volume products like home appliances and other consumer goods. This article offers a timely review of standards-writing activity, as OWCs find their way into diverse products varying from TV remote controls to satellite links. This article discusses the most popular standards for optical wireless communications. We outline the IEEE 802.11 standard for optical wireless local area networks, and the ongoing standardization effort by IrDA on personal optical wireless systems. The article concludes with a discussion of the recently announced IEEE 802.15.7 standard on visible light communications.