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System and Waveform Design for Wavelet Packet Division Multiplexing-Based Visible Light Communications

This study introduces the wavelet packet division multiplexing (WPDM) to visible-light communication (VLC) system. We provide the transceiver system model for the WPDM-based VLC, as well as the associated optimal waveform design under the lighting emitting diodes (LEDs) dispersion. The dispersion specific to each LED shows that such waveform design is done in an offline manner. Numerical results show the performance gain of the WPDM over the OFDM, in terms of improved out-of-band power leakage, smaller PAPR, more robust to LED nonlinearity and the channel dispersion. Moreover, the optimized waveform for the LED distortion shows performance gain over the conventional wavelet function, e.g., Daubechies wavelet functions. Such advantages make WPDM a good candidate for future VLC systems.