682Mbit/s phosphorescent white LED visible light communications utilizing analog equalized 16QAM-OFDM modulation without blue filter

Li, Honglei; Zhang, Yini; Chen, Xiongbin; Wu, Chunhui; Guo, Junqing; Gao, Zongyu; Pei, Weihua; Chen, Hongda

doi:10.1016/j.optcom.2015.05.033

Cited by 30 publications

(8 citation statements)

References 27 publications

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“…The system will experience less ISI in the received signal as the modulation bandwidth increases, thereby the BER performance of the VLC system is improved. H. Li et al extended the −3 dB bandwidth of a VLC system based on a phosphorescent white LED from 3 MHz to 143 MHz by using an analog pre-emphasis circuit and post-equalization circuit [31]. H. Zhang et al increased the −3 dB bandwidth of a white LED from 1 MHz to 520 MHz using a T-Bridge cascaded pre-equalization circuit and a blue flitter [32].…”

Section: Proposed T-bridge Pre-equalization Circuitmentioning

confidence: 99%

Over 700 MHz –3 dB Bandwidth UOWC System Based on Blue HV-LED With T-Bridge Pre-Equalizer

Zhang

Lai

et al. 2019

IEEE Photonics J.

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To achieve a good balance among the raw modulation bandwidth, the output optical power, and the dynamic swing range, three small GaN-based blue light-emitting diode (LED) cells are cascade interconnected on chip to form a 9 V HV-LED. A singlestage T-bridge equalizer is proposed to upgrade the-3 dB bandwidth and-6 dB bandwidth of a visible light communication/underwater optical wireless communication (VLC/UOWC) system based on the HV-LED to be over 700 and 900 MHz, respectively. To the best of our knowledge, it is the widest bandwidth of a VLC/UOWC system at the similar LED optical power level (120 mW). Under the forward error correction (FEC) limit of 3.8 × 10 −3 , data rates of 3.4 Gb/s over 1.8-m free-space transmission and 3 Gb/s over 1.2-m underwater channel are obtained using 16QAM-OFDM modulation scheme without complex algorithm. The T-bridge equalizer also improves the error free modulation bandwidths up to 450 MHz under 16QAM-OFDM, and up to 600 MHz under 8QAM-OFDM, respectively. Furthermore, the conjunction of the developed HV-LED and T-bridge equalizer endows the merit of a wide linear region of the modulation response, which will make the communication system be more tolerance to LED's degradation and system fluctuations.

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Section: Proposed T-bridge Pre-equalization Circuitmentioning

confidence: 99%

Over 700 MHz –3 dB Bandwidth UOWC System Based on Blue HV-LED With T-Bridge Pre-Equalizer

Zhang

Lai

et al. 2019

IEEE Photonics J.

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“…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. Li, H. et al (Li et al 2015) reported the 682 Mbps data rate transmission over 1m VLC link in VLC system employing OFDM modulation. Also, Lu, M. et al (Lu et al 2019) and Deng, R. et al (Deng et al 2018), reported the faithful transmission at 30 Mbps and 3.63 Gbps information rate over 3.5 m VLC link respectively OFDM-VLC system.…”

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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“…The main approach to improve bandwidth and data rate of a VLC system is by using the pre-emphasis technique [7], [14]- [21] and post-equalization technique [22], [23]. Implementing a VLC system to meet the higher data rate requirements and to accommodate more application scenarios typically employs pre-emphasis and post-equalization circuits at the same time [24], [25]. High-speed data transmission can be realized by VLC systems based on RGB LEDs [26], [27] Spectrallyefficient modulation-techniques were also proposed to increase the data rate, such as carrier-less amplitude and phase (CAP) modulation [28], [29], orthogonal frequency division multiplexing (OFDM) modulation [30], discrete multi-tone (DMT) modulation [31].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Bandwidth and Noise for Pre-Emphasis and Post-Equalization in Visible Light Communication

Yan

Mao

Xie

et al. 2020

IEICE Trans. Commun.

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This paper presents an analysis of the relationship between noise and bandwidth in visible light communication (VLC) systems. In the past few years, pre-emphasis and post-equalization techniques were proposed to extend the bandwidth of VLC systems. However, these bandwidth extension techniques also influence noise and sensitivity of the VLC systems. In this paper, first, we build a system model of VLC transceivers and circuit models of pre-emphasis and postequalization. Next, we theoretically compare the bandwidth and noise of three different transceiver structures comprising a single pre-emphasis circuit, a single post-equalization circuit and a combination of pre-emphasis and post-equalization circuits. Finally, we validate the presented theoretical analysis using experimental results. The result shows that for the same resonant frequency, and for high signal-to-noise ratio (S/N), VLC systems employing post-equalization or pre-emphasis have the same bandwidth extension ability. Therefore, a transceiver employing both the pre-emphasis and post-equalization techniques has a bandwidth √ 2 times the bandwidth of the systems employing only the pre-emphasis or post-equalization. Based on the theoretical analysis of noise, the VLC system with only active preemphasis shows the lowest noise, which is a good choice for low-noise systems. The result of this paper may provide a new perspective of noise and sensitivity of the bandwidth extension techniques in VLC systems.

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682Mbit/s phosphorescent white LED visible light communications utilizing analog equalized 16QAM-OFDM modulation without blue filter

Cited by 30 publications

References 27 publications

Over 700 MHz –3 dB Bandwidth UOWC System Based on Blue HV-LED With T-Bridge Pre-Equalizer

Over 700 MHz –3 dB Bandwidth UOWC System Based on Blue HV-LED With T-Bridge Pre-Equalizer

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

A Comparative Study on Bandwidth and Noise for Pre-Emphasis and Post-Equalization in Visible Light Communication

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