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Simulation and Hardware Implementation of DC-Biased Optical OFDM (DCO-OFDM) for Visible Light Communications

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In recent years, Optical Wireless Communications (OWC) have gained importance especially in the emerging Visible Light Communication (VLC) field. Compared with RF sources, VLC can provide higher data rates where Light Emitting Diodes (LEDs) are used due to its superior bandwidth  In this paper, an implementation of DC biased optical OFDM (DCO-OFDM) has been designed on Virtex-5 FPGA kit. The performance of the designed system has been investigated for different mapping schemes such as BPSK, QPSK, 8QAM, and 16QAM. The practical results are in agreement with the simulation one, and they reflect the reliability of the designed system. To investigate the designed VLC system further, visual images have been transmitted and received successfully with Bit Error Rates (BER) less than 10-5.
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