{'fraction_non_alphanumeric': 0.0379746835443038, 'fraction_numerical': 0.0, 'mean_word_length': 5.430894308943089, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Visible light communication based on wavelet packet division multiplexing

We introduce wavelet packet division multiplexing (WPDM) to Light-emitting diodes (LED)-based optical wireless communication systems. We first review the WPDM fundamental knowledge, and then provide a LED communication system diagram based on WPDM. Then, we evaluate the performance of the WPDM-based LED communication system, and compare it with the DC biased optical OFDM (DCO-OFDM)-based communication system. From simulation results, it is seen that the WPDM-based system shows higher spectrum and power efficiency, lower peak-to-average power ratio (PAPR), more robust to inter-symbol interference (ISI) and LED nonlinear distortion. Those features make WPDM a good candidate for the LED communication systems.