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| Orthogonal frequency division multiplexing (OFDM) technology is available to improve the communication rate of visible light communication (VLC) systems and suppress inter-symbol crosstalk. However, one of its operational limitations is the peak-to-average power ratio (PAPR) of the transmitted signal. In respond to this problem, an optimization scheme for phase factor estimation based on partial transmit sequences (PTS) is proposed. In this scheme, the original signal of the conjugate symmetrical data block length is divided into multiple data blocks, and each data block is subjected to IFFT transformation. At the receiver, the phase factor is selected according to the output signal of the PTS. Besides, the phase factor of each transformed data is weighted, and the superimposed signal is loaded on the LED. Simulation results show that this method is available to effectively reduce the PAPR of the OFDM based on VLC systems and obtain good bit error rate (BER) performance. |
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| Keywords:VLC; OFDM; PAPR; PTS; phase factor estimation |
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