Browsing by Author "Cogalan, Tezcan"

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    Ofdm With Transmit and Receive Antenna Selection Based on Subcarrier Groups
    (IEEE, 2012) Remlein, Piotr; Cogalan, Tezcan; Güçlüoğlu, Tansal
    In this paper the performance of coded OFDM transmission over multiple antennas is explored when joint transmit and receive antenna selection is employed. The channel is assumed as Rayleigh frequency selective fading channel and only receiver is assumed to have perfect channel state information (CSI). The performance of MIMO OFDM system using pragmatic coding techniques such as convolutional coding (CC) and space-time block coding (STBC) with antenna selection based on subcarrier groups and other types such as all-tone per-tone and hybrid techniques are obtained via computer simulations. The results suggests that joint antenna selection particularly based on subcarrier groups can be a desirable option in Worldwide Interoperability for Microwave Access (WiMAX) and Long Term Evolution (LTE) standards.
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    Precoded Single-Cell Multi-User Miso Visible Light Communications
    (Institute of Electrical and Electronics Engineers Inc., 2015) Cogalan, Tezcan; Panayırcı, Erdal; Haas, Harald; Panayırcı, Erdal
    This study investigates the effects of transmitter and receiver parameters on the performance of a precoded singlecell (SC) multi-user (MU) multi-input-single-output (MISO) visible light communication (VLC) system. A zero-forcing (ZF) precoding technique is used within the constraints of optical transmission power and non-negativity of an intensity modulated (IM) transmitted signal. The simulation results show that the physical features of the light emitting diode (LED) and photodiode (PD) have a significant effect on the bit error rate (BER) and total spectral efficiency (SE) performance of the VLC system. The deployment with 8 users and 45o receiver field-of-view (FOV) achieves both the targeted BER and approximately 50 bits/s/Hz total SE when the transmitter semi-angles are 30o and 60o. © VDE Verlag GMBH Berlin Offenbach Germany.