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Ultra high-speed VLC system using polarization division multiplexed QPSK, DSP, and matched filters

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Abstract

Considering the present frequency bands, experts believe that the 100 GHz range is not adequate to meet the growing user demand, and the problem of scarce spectrum can be solved by surpassing 100 GHz for sixth-generation (6G) communication. For emerging 6G wireless optical communication networks (WOCN), visible light communication (VLC) is an appealing, unlicensed, speedy, and effective method which uses the visible light spectrum (380–780 nm). In this work, an indoor VLC system is demonstrated using polarization division multiplexed quadrature phase shift keying (PDM-QPSK) digital signal processing (DSP) with a matched filter over a link of 8 m between the irradiating source and detection area. It is observed that DSP and a matched filter improves the system performance by compensating for the effects of pulse width broadening, nonlinear effects, equalization, normalization, carrier phase estimation, frequency phase estimation, and filtering. Different parameters are investigated, such as VLC length, transmitter half angle (degree) (THA), incidence half angle (degree) (IHA), optical concentrator (cm2) in terms of log SER, quality factor (Q) factor, error vector magnitude percentage (EVM%), and bit error rate (BER). Constellations are analyzed with DSP and without DSP, and to the best of the authors’ knowledge, a 1.6 Tbps VLC system covering 8 m indoor distance is proposed for the first time. Results revealed that lower values of THA, IHA, and optical concentrator provide an enhanced Q factor), log symbol error rate (SER), and EVM%.

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It is stated that no funding has been taken to complete the proposed work, and research work was conducted in GNDEC Ludhiana only.

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  1. ECE, IKGPTU, Jalandhar, India

    Harleen Kaur

  2. ECE, GNDEC, Ludhiana, India

    Narwant Singh Grewal

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  1. Harleen Kaur
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Correspondence to Harleen Kaur.

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Kaur, H., Grewal, N.S. Ultra high-speed VLC system using polarization division multiplexed QPSK, DSP, and matched filters. Opt Quant Electron 54, 636 (2022). https://doi.org/10.1007/s11082-022-03882-7

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