Browsing by Author "Sayli, Osman"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Conference Object
    Citation Count: 19
    On Channel Estimation in DC Biased Optical OFDM Systems Over VLC Channels
    (IEEE Computer Society, 2016) Panayırcı, Erdal; Dogan, Hakan; Panayırcı, Erdal
    Visible Light Communication(VLC) has been considered as a potential access option for 5G wireless systems to solve performance limitation due to bandwidth shortage at radio frequency (RF) band. In (VLC) system illumination infrastructure has dual usage at the same time namely illumination and wireless data transmission. DC Biased optical (DCO)-OFDM has been proposed for VLC systems to provide optically power efficient solution and easy implementation. Wireless communication systems generally require estimating and tracking the fading channel in order to detect transmitted data coherently. In this work comb type pilot arrangement with interpolation and block type pilot arrangement are proposed for the DCOOFDM systems over visible light channels. Simulation results have verified that the proposed block type pilot arrangement based channel estimation has clear BER performance advantages compared with comb type pilot arrangement based channel estimation. © 2016 IEEE.
  • Thumbnail Image
    Conference Object
    Citation Count: 3
    Spline Interpolation Based Channel Estimation for ACO-OFDM over Visible Light Channels
    (IEEE, 2016) Sayli, Osman; Dogan, Hakan; Panayırcı, Erdal
    Visible light communication has been considered one of promising candidate technology to solve performance limitation due to bandwidth shortage at radio frequency (RF) band. In VLC system, the visible light is used not only for illuminating rooms but also for an optical data transmission. ACO-OFDM is a power efficient modification of OFDM to use in VLC systems. Wireless communication systems generally require estimating and tracking the fading channel in order to detect transmitted data coherently. In this work, spline interpolation based channel estimations for comb type pilot distribution is proposed over visible light channels. Computer simulation results have confirmed that the proposed channel estimation technique has a clear BER performance advantages compared with linear interpolation based channel estimation for higher order modulations.