Abstract
Layered/enhanced asymmetrically clipped optical orthogonal frequency division multiplexing (L/e-ACO-OFDM, shortened as L/e-ACO) has recently attracted increasing interests for the intensity-modulated directed-detected (IM/DD) optical wireless communication (OWC). This form of optical OFDM can achieve a high spectrum efficiency without a DC bias; however, similar to the conventional OFDM, L/e-ACO can results in a high peak-to-average power ratio (PAPR). In this paper, interleaved discrete-Fourier-transform-spread L/e-ACO (IDFTS-L/e-ACO) is proposed for the IM/DD OWC. Specifically, two kinds of IDFTS-L/e-ACO techniques are proposed. For readability, one is denoted as HS-IDFTS that implements Hermitian symmetry (HS) to generate real-valued signals, and the other is denoted as RI-IDFTS that employs the real and imaginary separation (RIS) to transform complex signals to real-valued ones. The theoretical analysis and Monte Carlo simulation show that both the IDFTS-L/e-ACO techniques have a smaller PAPR than the conventional L/e-ACO, and RI-IDFTS has even further smaller PAPR. In addition, bit-error-rate (BER) comparison indicates both HS-IDFTS and RI-IDFTS have better BER performance compared to the conventional L/e-ACO, and RI-IDFTS is least sensitive to LED nonlinearity and has the best BER performance.
© 2018 IEEE
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