A Scheme of CAP-DPIM Hybrid Mudulation for VLC

XIN Jia-jun; WANG Xu-dong; WU Nan

doi:10.13756/j.gtxyj.2021.01.002

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A Scheme of CAP-DPIM Hybrid Mudulation for VLC

- A Scheme of CAP-DPIM Hybrid Mudulation for VLC
- Study on Optical Communications Issue 1, Pages: 5-9,35(2021)
- 作者机构：
  
  大连海事大学　信息科学技术学院，辽宁　大连　116026
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2021.01.002
  CLC： TN929.12
- Published：10 February 2021，
  
  Received：11 August 2020，
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XIN Jia-jun, WANG Xu-dong, WU Nan. A Scheme of CAP-DPIM Hybrid Mudulation for VLC. [J]. Study on Optical Communications (1):5-9,35(2021)
DOI：

XIN Jia-jun, WANG Xu-dong, WU Nan. A Scheme of CAP-DPIM Hybrid Mudulation for VLC. [J]. Study on Optical Communications (1):5-9,35(2021) DOI： 10.13756/j.gtxyj.2021.01.002.

摘要

针对可见光通信系统传输性能问题，文章提出了一种无载波幅度相位（CAP）调制与数字脉冲间隔调制（DPIM）结合的混合调制方案。该方案分别利用两者频谱效率和功率效率较高的特点，发送端在脉冲间隔调制的脉冲时隙加载直流偏置光CAP（DCO-CAP）信号，实现混合调制信号的并行生成，接收端通过门限检测和最大似然检测完成混合调制信号的串行解调。推导了室内可见光高斯信道下混合调制方案的误码率（BER）及误帧率（FER）解析表达式。此外，从频谱效率和FER两方面对比分析了该混合调制方案与传统DPIM及DCO-CAP方案的性能优劣。数值仿真结果表明：当频谱效率相同时，混合调制方案较单一调制有更高的可靠性。

Abstract

In order to improve the performance of indoor Visible Light Communication (VLC) system

a hybrid modulation scheme combining Carrierless Amplitude Phase (CAP) modulation and Digital Pulse Interval Modulation (DPIM) is proposed. This scheme takes advantage of both characteristics of higher spectral efficiency and power efficiency. A parallel modulation structure is adopted to realize the signal generation at the transmitter side

and the transmission of Direct Current biased Optical-CAP (DCO-CAP) signal are controlled by pulse time slot of the pulse interval modulation. The threshold value detection and the maximum likelihood criterion are used to complete the serial demodulation of modulated signals at the receiver side. Analytical expressions of Bit Error Rate (BER) and Frame Error Rate (FER) for the hybrid modulation scheme over Gaussian channel are derived. In addition

the performance of the proposed scheme and ordinary schemes are contrastively analyzed in terms of spectral efficiency and system reliability. The numerical results show that the hybrid system is more reliable compared with ordinary modulation system under the condition of same spectral efficiency.

关键词

可见光通信无载波幅度相位调制脉冲间隔调制误帧率频谱效率

Keywords

VLCCAP modulationpulse interval modulationFERspectral efficiency

references

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Vappangi S, ManiV . Concurrent Illumination and Communication: A Survey on Visible Light Communication[J]. Physical Communication, 2019(33): 90-114.

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Haigh P, Burton A, Werfli K, et al. A Multi-CAP Visible-Light Communications System with 4.85 bit/s/Hz Spectral Efficiency[J]. IEEE Journal on Selected Areas in Communications, 2015, 33(9): 1771-1779.

王旭东, 崔玉, 吴楠.可见光多维无载波幅度相位调制系统[J].电子与信息学报, 2017, 39(12): 3004-3012.

Chi N, Zhou Y J, Liang S Y, et al. Enabling Technologies for High-Speed Visible Light Communication Employing CAP Modulation[Invited][J]. Journal of Lightwave Technology, 2018, 36(2): 510-518.

Morra A E, Shalaby H M, Hegazy S F, et al. Hybrid Direct-Detection Differential Phase Shift Keying-Multipulse Pulse Position Modulation Techniques for Optical Communication Systems[J]. Optics Communications, 2015, 357(12): 86-94.

Khallaf H S, Shalaby H M H. Proposal of a Hybrid QAM-MPPM Technique for Optical Communications Systems[C]//16thInternational Conference on Transparent Optical Networks(ICTON). Graz, Austria: IEEE, 2014: 1-4.

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