An approach enabling adaptive FEC for OFDM in fiber-VLLC system

Wei, Yiran; He, Jing; Deng, Rui; Shi, Jin Wei; Chen, Shenghai; Chen, Lin

doi:10.1016/j.optcom.2017.08.041

Cited by 20 publications

(5 citation statements)

References 21 publications

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“…FEC limit @ 3.8×10 -3 BER FEC limit The dotted line at BER of 3.8×10 −3 presents the minimum BER value for the successful receipt of the signal under the forward error correction (FEC) of 7% (Wei et al 2017). From figures, it is observed that as the data rate increases, the BER of the downstream and upstream VLC signals increases for all three modulations.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, various works on OFDM using LD based VLC system as visible laser light communication (VLLC) have been investigated and analyzed. Wei, Y. et al (Wei et al 2017), presented the transmission of 2.5 Gbps-10 GHz data in fiber-VLLC system utilizing OFDM over 20 km wired and 8 m VLLC link. Shi, J. et al (Shi et al 2018), demonstrated the successful transmission at 3.2 Gbps information rate in OFDM/offset QAM (OFDM/OQAM) on the basics of VLLC-WDM system over 50 km wired and 4.5 m VLLC links.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

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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“…As mentioned above, one feature of polar code construction is channel dependent, hence it is not versatile for fading channels because of mismatched decoding. Unfortunately, the transmission of VLC system suffers from a fading effect, incurring severe damages to high-frequency subcarriers [11]. It is mainly caused by the limited bandwidth of devices such as LED and photodiode (PD).…”

Section: An Encoder-subcarrier Mapping Methods For Ofdm Vlc Channelmentioning

confidence: 99%

“…In [6], by using OFDM combined with 64-QAM, an RGB-LED-based VLC system can realize high spectral efficiency. In addition, the link of VLC system is susceptible to noises, and forward error correction (FEC) [10], [11] is usually utilized to improve reliability. The conventional FEC codes, such as…”

Section: Introductionmentioning

confidence: 99%

An Efficient Encoder-Subcarrier Mapping Method Combined With Polar Code for Visible Light Communication

Zhou

et al. 2019

IEEE Access

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A spectral efficient light emitting diode (LED)-based visible light communication (VLC) system adopting polar-coded 128 quadrature-amplitude modulations (QAM) orthogonal frequency division multiplexing (OFDM) is experimentally demonstrated. To overcome frequency fading in the VLC system, an encoder-subcarrier mapping method is proposed. The experimental results show that, at a sampling rate of AWG with 150 MSa/s, it can realize error-free transmission with high-spectral efficiency (SE) up to 5.77 bit/s/Hz using the proposed method. Its SE is 1.3 times of the un-coded system adopting 16-QAM. At a sampling rate of 175 MSa/s, its measured Q-factor is 9.86 dB, which improves by 5.12 dB compared to the case without coding. INDEX TERMSVisible light communication (VLC), orthogonal frequency division multiplexing (OFDM), quadrature-amplitude modulation (QAM), polar code.

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“…OFDM signals based on rise code (RS) combined with the OCT-precoding scheme have been investigated in the fiber fusion laser visible light system. BER performance could be improved, and SNR on each subcarrier could be averaged by using the scheme based on OCT-precoding combined with adaptive modulation OFDM and the scheme based on RS code combined with OCT-precoding, which has been proved in the fiber fusion laser visible light system [11]. For MB-OFDM UWB signals, in the process of optical fiber transmission, it is easy to be affected by the nonlinearity of optical devices and optical fibers, especially the noise of modulators and amplifiers, chromaticity dispersion, and insertion loss of optical fibers.…”

Section: Introductionmentioning

confidence: 99%

OCT-Precoding Combined with LDPC-Coding Scheme for 128 QAM MB-OFDM UWBoF System

Xiang

Yang

Zhu

et al. 2020

Advances in Condensed Matter Physics

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In this paper, we proposed a coding scheme based on orthogonal cyclic transpose (OCT) precoding combined with low-density parity check (LDPC) code to improve the transmission performance of 128-quadrature amplitude modulation multiband orthogonal-frequency-division-multiplexing ultrawide band over fiber (128 QAM MB-OFDM UWBoF) system. The proposed scheme could not only improve the performance of the system but also average the signal-to-noise ratio (SNR) of subcarriers and reduce the difference among subchannels in practical application. The simulation results showed that compared with the traditional scheme, the receiver performance of this scheme was improved by 2.7 dB when the LDPC-coding rate was 87.5% through 70 km standard single mode fiber (SSMF) transmission and the bit error rate (BER) was 3.8 × 10−3. Besides, the constellation distribution was more convergent and uniform.

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An approach enabling adaptive FEC for OFDM in fiber-VLLC system

Cited by 20 publications

References 21 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

An Efficient Encoder-Subcarrier Mapping Method Combined With Polar Code for Visible Light Communication

OCT-Precoding Combined with LDPC-Coding Scheme for 128 QAM MB-OFDM UWBoF System

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