A MB-CAZAC precoding combined with 128/64/32/16-QAM modulation for OFDM-VLC system

Ma, Jie; He, Jing; Chen, Qinghui; Shi, Jin Wei; Zhou, Zhi‐Hua; Cheng, Yun; Xiao, Yaoqiang

doi:10.1016/j.optcom.2018.04.047

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…Besides, VLC can be installed and utilized for the backup optical fiber, point-to-point (P2P) last-mile access and organization connectivity to offer the system security in the presence of geographical constraints (Mallick et al 2020;Mohd Nor et al 2019;Prabu et al 2017). Since wireless communication and illumination can be obtained simultaneously, light-emitting diode (LED)-based VLC has been frequently studied (Jani et al 2019;Ma et al 2018;Wu et al 2017). Chen, M. et al (Chen et al 2020) reported the 157.5 Mbps data rate transmission in 2×2 multiple inputs-multiple-output (MIMO)-OFDM VLC system over 0.5 m VLC link.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

2021

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In this work, a full-duplex time and wavelength division multiplexing-passive optical network (TWDM-PON) system is analysed. Orthogonal frequency division multiplexing (OFDM) with m-quadrature amplitude modulation (m-QAM) is employed to improve the performance of TWDM-PON for downstream and upstream transmission. Simultaneously, multi-color (390-750 nm) laser diodes (LDs) are employed for visible light communication (VLC) using various VLC links to encourage the information rate of fiber/VLC optical network. A TWDM-PON utilizing 16-, 32-and 64-QAM OFDM with ten LDs based VLC system has been analysed for full-duplex multi-color VLC signals of the system. The impact of the LDs input current and high transmission rate in the proposed PON/VLC link has been investigated for m-QAM OFDM modulation. The results show that the 40/40 Gbps 16-, 32-and 64-QAM signals over ten 8000 m VLC links and a 50 km fiber link are successfully transmitted at the modulation input current of 9 mA under bit error rate (BER) of 3.8×10 -3 .Also, the proposed system employing 16-, 32-and 64-QAM signals over a 10 km fiber and ten 10 m VLC links provide the maximum transmission rate of 120, 100 and 80 Gbps respectively. Moreover, the measured error vector magnitudes (EVMs) and calculated BER values for 16-QAM downstream and upstream signals, are well below the required FEC limit than high-order modulation formats. Further, the numerical analysis of the proposed system reveals the superiority of the proposed fiber/VLC links.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

2021

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“…In some recent publications, a new precoding technique has been highlighted to improve BER and PAPR results [21, 22]. In [23], to enhance BER performance and reduce PAPR, a precoding matrix of constant amplitude zero autocorrelation is included with OFDM. Further in 2019, the authors in [24] proposed a novel system model to improve the BER performance using binary pulse position modulation (BPPM) encoder with OOFDM.…”

Section: Introductionmentioning

confidence: 99%

Hybrid mapped optical‐OFDM using non‐linear companding technique for indoor visible light communication application

2020

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“…Recently, another pattern of precoding technique has been used in optical OFDM transmission to improve the PAPR and BER performance [22], [23]. This pattern uses a sequence to build an ordinary matrix and then multiply with the input data for precoding.…”

Section: Introductionmentioning

confidence: 99%

“…The precoding matrix has been used in OFDM VLC systems to enhance the transmission performance [23]. In [23], a precoding matrix based on constant amplitude zero auto correlation (CAZAC) sequence is used in OFDM VLC system to improve the PAPR and BER performance. However, to the best of our knowledge, the explicit theoretical analysis of precoding matrix used in VLC systems is still insufficient.…”

Section: Introductionmentioning

confidence: 99%

Investigation of DC-Biased Optical OFDM With Precoding Matrix for Visible Light Communications: Theory, Simulations, and Experiments

et al. 2018

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Orthogonal frequency-division-multiplexing (OFDM) technology is widely used in visible light communication (VLC) to achieve high data rate transmission. However, the traditional direct-current (DC)-biased optical OFDM (DCO-OFDM) VLC systems suffer from the high peak-to-average power ratio (PAPR) which causes signal clipping distortion, and, thus, performance degradation. Furthermore, severe high-frequency fading due to the limited system bandwidth results in poor bit error rate (BER) performance. Precoding matrix (PM) techniques have been proposed to enhance the performance of VLC OFDM transmission, but a little or no work has been carried out in investigating the theory of PM used in OFDM VLC systems. In this paper, we aim to reveal the theory of PM-DCO-OFDM for a VLC system. To figure out the intrinsic laws of a PM method, we investigate the principles of PAPR reduction, clipping distortion optimization, and signal-to-noise ratio (SNR) distribution equalization. Based on the analysis of PAPR, we theoretically proved the simplicity of PM as a method to reduce the possibility of high PAPR by improving the autocorrelation performance of input symbols. The clipping distortion could be improved due to the reduction of high PAPR. Moreover, the relatively uniform SNR distribution can be achieved by PM through equalizing the clipping and channel noise, which is beneficial to improve the BER performance in high-frequency constrained systems. However, the PM method used in a DCO-OFDM VLC system should consider the transmitting power, modulation format, and transmission distance as a whole to achieve the transmission performance improvement. The simulation results demonstrate the complementary cumulative distribution function of PAPR can be reduced ∼3 dB, while the performance of clipping distortion power and clipping error probability are significantly improved. Furthermore, experiment is carried out with results showing that the PM method can improve the BER performance in the case that VLC OFDM transmission has enough transmitting power, but with the low transmitting power, the PM also can damage the BER performance. The simulation and experiment results are consistent with our theoretical analysis.

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A MB-CAZAC precoding combined with 128/64/32/16-QAM modulation for OFDM-VLC system

Cited by 15 publications

References 23 publications

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

Hybrid mapped optical‐OFDM using non‐linear companding technique for indoor visible light communication application

Investigation of DC-Biased Optical OFDM With Precoding Matrix for Visible Light Communications: Theory, Simulations, and Experiments

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