TY - JOUR
T1 - Clipping-Free Multilayer Optical OFDM for IM/DD-based Communication Systems
AU - Wang, Hongxu
AU - Zhang, Huixin
AU - Ghassemlooy, Zabih
AU - Zhang, Tian
N1 - Funding information: This work was supported in part by the scientific research Project of Education Department of Jilin Province under Grant JJKH20231294KJ, in part by the National Natural Science Foundation of China under Grant 11905028, and in part by the Foundation for Excellent Young Talents of Jilin Province under Grant 20190103010JH.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - A low-complexity and high-performance clipping-free multilayer optical orthogonal frequency division multiplexing scheme is proposed for optical wireless communication (OWC). At the transmitter, the symbols of multi-layer quadrature amplitude modulation (QAM) are first arranged according to a specific rule in the frequency domain to generate a bipolar time-domain signal using a single inverse fast Fourier transform (IFFT). Then the bipolar signal is superimposed with an adaptive periodic DC bias to meet the real and positive requirements in intensity modulation / direct detection (IM/DD) systems. At the receiver, a zero-value regression (Re0) -based demodulation is proposed to optimize the bit error rate (BER). As the signal generation and demodulation are realized by single IFFT and fast Fourier transform (FFT) respectively, the proposed scheme has nearly the same system complexity as the single-layer modulations and similar spectral efficiency with those advanced multilayer modulations. In addition, the proposed periodic DC improves the power efficiency and avoids the interlayer interference. Numerical simulation results show that, compared with LACO-OFDM [34] with 3 layers, the proposed scheme can attain a PAPR gain of 2.4 dB and BER gain of 1.4 dB and 3 dB for the linear and nonlinear channel, respectively.
AB - A low-complexity and high-performance clipping-free multilayer optical orthogonal frequency division multiplexing scheme is proposed for optical wireless communication (OWC). At the transmitter, the symbols of multi-layer quadrature amplitude modulation (QAM) are first arranged according to a specific rule in the frequency domain to generate a bipolar time-domain signal using a single inverse fast Fourier transform (IFFT). Then the bipolar signal is superimposed with an adaptive periodic DC bias to meet the real and positive requirements in intensity modulation / direct detection (IM/DD) systems. At the receiver, a zero-value regression (Re0) -based demodulation is proposed to optimize the bit error rate (BER). As the signal generation and demodulation are realized by single IFFT and fast Fourier transform (FFT) respectively, the proposed scheme has nearly the same system complexity as the single-layer modulations and similar spectral efficiency with those advanced multilayer modulations. In addition, the proposed periodic DC improves the power efficiency and avoids the interlayer interference. Numerical simulation results show that, compared with LACO-OFDM [34] with 3 layers, the proposed scheme can attain a PAPR gain of 2.4 dB and BER gain of 1.4 dB and 3 dB for the linear and nonlinear channel, respectively.
KW - Optical wireless communication
KW - bit error rate
KW - complexity
KW - peak-to-average power ratio
KW - spectral efficiency
UR - http://www.scopus.com/inward/record.url?scp=85153348209&partnerID=8YFLogxK
U2 - 10.1109/tcomm.2023.3264864
DO - 10.1109/tcomm.2023.3264864
M3 - Article
SN - 0090-6778
VL - 71
SP - 3469
EP - 3480
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 6
ER -