Nonlinear coded nonuniform superposition QAM by trellis-coding for MISO system in visible light communication

Xu, Zengyi; Niu, Wenqing; Shi, Jianyang; Chi, Nan

doi:10.3788/col202220.042501

Cited by 4 publications

(1 citation statement)

References 19 publications

(23 reference statements)

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“…Compared with light-emitting diodes (LEDs)-enabled VLC, application scenarios of VLC based on laser diode (LD) can easily achieve high-speed and long-distance signal transmissions owing to its inherent large bandwidth of LDs [2] . To further improve the data rate, the discrete multi-tone (DMT) modulation technique with high spectral efficiency (SE) has been widely investigated in both real-time and offline digital signal processing (DSP) approaches [3][4][5] . Unfortunately, the overall bit error ratio (BER) or signal-to-noise ratio (SNR) performance may be seriously degraded by the various impairments in the DMT VLC transmission system, such as digitalanalog converter (DAC)/analog-digital converter (ADC)induced clock tone leakage (CTL) [6] , imperfect optoelectronic devices-induced nonlinear effect, and serious low-pass-like decline [7] .…”

Section: Introductionmentioning

confidence: 99%

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

et al. 2023

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To overcome the unbalanced signal-to-noise ratio (SNR) among data-carrying subcarriers (SCs) induced by the imperfect frequency response of optoelectronic devices and various interferences, a channel-independent partial data-carrying SCs precoding (PDSP) method based on orthogonal circular matrix transform (OCT) is proposed and experimentally investigated in an intra-symbol frequency average (ISFA)-enabled discrete multi-tone (DMT) visible light communication (VLC) system. After transmission over 1.9 m free space, at the optimal bias current of 100 mA, the experimental results show that the bit error ratio (BER) performance can be improved by up to an order of magnitude with conventional full data-carrying SCs precoding (FDSP) and PDSP scheme, compared to that without a precoding scheme. Moreover, the BER performance can further be enhanced when the ISFA algorithm with optimal taps is employed. Compared with the FDSP scheme, the proposed PDSP scheme owns a similar BER performance and a significant reduction in required multiplication and addition operations, and it may be a good option to efficiently combat the unbalanced impairments of DMT-VLC transmission systems.

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Section: Introductionmentioning

confidence: 99%

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

et al. 2023

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Topological photonics in three and higher dimensions

Han,

Xi,

Meng

et al. 2024

APL Photonics

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Topological photonics is a rapidly developing field that leverages geometric and topological concepts to engineer and control the characteristics of light. Currently, the research on topological photonics has expanded from traditional one-dimensional (1D) and two-dimensional (2D) to three-dimensional (3D) and higher-dimensional spaces. However, most reviews on topological photonics focus on 1D and 2D systems, and a review that provides a detailed classification and introduction of 3D and higher-dimensional systems is still missing. Here, we review the photonic topological states in 3D and higher-dimensional systems on different platforms. Moreover, we discuss internal connections between different photonic topological phases and look forward to the future development direction and potential applications of 3D and higher-dimensional systems.

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Study of high-order non-equal probability QAM for visible light communication systems

Guo,

Lu,

Chu

2024

Opt. Lett.

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In this Letter, we propose and experimentally demonstrate a high-order non-equal probability quadrature amplitude modulation (NEP-QAM) scheme for visible light communication (VLC) systems, where NEP-72QAM is considered as an example. Nonlinear coding is introduced to generate the NEP-18QAM signal in the first quadrant, which is then jointly mapped with the other two bits to obtain the four-quadrant symmetric NEP-72QAM signal. Moreover, a bit-to-symbol labeling scheme is proposed to achieve thorough Gray mapping. The experimental results show that the NEP-72QAM scheme achieves better performance than the traditional 64QAM scheme regardless of whether the light-emitting diode (LED) operates in the linear or nonlinear range. Compared with the probabilistically shaped 72QAM scheme, the available range of the driving peak-to-peak voltage of the NEP-72QAM scheme is only reduced by 20 mV when 0.92 is used as the normalized generalized mutual information threshold, but the complexity is much lower.

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Nonlinear coded nonuniform superposition QAM by trellis-coding for MISO system in visible light communication

Cited by 4 publications

References 19 publications

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

Topological photonics in three and higher dimensions

Study of high-order non-equal probability QAM for visible light communication systems

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