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Non-Uniform Time Slot Based Modulation for Visible Light Communication System

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Abstract

Recently, visible light communication (VLC) has got increasing attention in the field of indoor wireless communications. VLC has the obligation of lighting besides data communications. The IEEE 802.15.7 task group proposed a VLC modulation format named color shift keying in which data symbols are defined based on the diffused light wavelength. This paper presents a new modulation scheme for indoor wireless visible light communication system named non-uniform time slot modulation (NUTS). The NUTS modulation scheme defines the feeder signals of red, green and blue LEDs as rectangular pulses with appropriate width and their positions. In this method, the time axes of all the three light sources (channels) are slotted to some non-uniform durations that all symbols are spanned over these slots as orthogonal dimensions. The proposed scheme has some advantages with respect to other approaches such as low bit error rate and high bit rate. Furthermore, it provides appropriate synchronization capability. Besides, in the design of NUTS modulation scheme it has been tried to deliberate all practical constraints, as far as possible.

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Authors and Affiliations

  1. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran

    Hamed Alizadeh Ghazijahani & Mir Javad Musevi Niya

Authors
  1. Hamed Alizadeh Ghazijahani
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  2. Mir Javad Musevi Niya
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Correspondence to Hamed Alizadeh Ghazijahani.

Appendix

Appendix

Table 3 shows the truth table of NUTS modulator circuits logical part operation. S i, S j and S k parameters are states of I, J and K channels, respectively. The state determines whether the channel is selected as fixed (1) or dynamic (0) channel. E1, E2 and E3 are three pins to enable (or disable) delay blocks for channel feeder signals.

Table 3 Truth table of the logical circuit where depicted in Fig. 3
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Ghazijahani, H.A., Niya, M.J.M. Non-Uniform Time Slot Based Modulation for Visible Light Communication System. Wireless Pers Commun 98, 1753–1770 (2018). https://doi.org/10.1007/s11277-017-4943-3

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