Browsing by Author "Narmanlioglu, Omer"

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    Comparative performance evaluation of MIMO visible light communication systems
    (IEEE, 2016) Damen, M. O.; Narmanlioglu, Omer; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Narmanlioglu, Omer
    In this paper, we consider multiple-input multiple-output (MIMO) visible light communication (VLC) systems. The physical layer of VLC system builds upon optical orthogonal frequency division multiplexing (O-OFDM). Repetition code (RC), spatial multiplexing (SMUX) and spatial modulation (SMUD) are considered as MIMO techniques. We evaluate the performance of three MIMO O-OFDM VLC systems under consideration through the derivation of bit error rate expressions.
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    Performance of eU-OFDM based relay-assisted visible light communications
    (IEEE, 2016) Djengomemgoto, Gerard; Narmanlioglu, Omer; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Djengomemgoto, Gerard; Narmanlioglu, Omer
    In this paper, we consider relay-assisted visible light communication (VLC) system where intermediate light source cooperates with main light source. Following IEEE 802.15.7r VLC reference channel model, we assume presence of two difference light sources in office space. First one is information source employed on ceiling and second one is desk lamp. Our system builds upon enhanced unipolar optical orthogonal frequency division multiplexing (eU-OFDM) where task light performs amplify-and-forward relaying to assist the communication and operates in half-duplex mode. We investigate bit error rate performance of relay-assisted VLC system and demonstrate that cooperation brings significant performance gains over direct transmission.
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    Physical layer implementation of standard compliant vehicular VLC
    (IEEE, 2017) Turan, B.; Narmanlioglu, Omer; Coleri Ergen, S.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Narmanlioglu, Omer
    Visible light communication (VLC) has recently gained popularity as a complementary technology to radio frequency (RF) based alternatives for vehicular communications as a low-cost, secure and RF interference free technology. In this paper, we propose IEEE 802.15.7 standard-compliant physical layer (PHY) implementation and experimental evaluation, using commercial off-the-shelf (COTS) automotive light emitting diode (LED) fog light for the purpose of low-latency safety message dissemination. We first show that the standard is applicable to line of sight (LoS) vehicle-to-vehicle (V2V) VLC. We then demonstrate that the proper selection of modulation coding schemes (MCS) plays an important role in order to minimize bit-error- rate (BER) for the reliable transmission with varying inter-vehicle distances. We also addressed the angular limitations of COTS automotive LED light for viable vehicular VLC.
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    Poster: on-board camera video transmission over vehicular VLC
    (IEEE, 2017) Narmanlioglu, Omer; Turan, B.; Kebapci, Burak; Coleri Ergen, S.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Narmanlioglu, Omer; Kebapci, Burak
    Vehicular connectivity is envisaged to extend vehicle on-board camera videos to the nearby vehicles in order to increase drivers' road awareness. This paper demonstrates the possibilities of video transmission captured by vehicle on-board forward-looking camera via visible light communications (VLC) using taillights to provide see-beyond the front vehicle assistance. Line of sight (LoS) inter-vehicular video transmission using direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) based VLC with the data rate of 6.42 Mbps and lower latency than 32 msec is validated through experiments.