AC-based phosphor LED visible light communication by utilizing novel signal modulation |
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Authors: | Y. F. Liu C. H. Yeh C. W. Chow Y. L. Liu |
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Affiliation: | 1. Department of Photonics, Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan 2. Information and Communications Research Laboratories, Industrial Technology Research Institute (ITRI), Chutung, Hsinchu, 31040, Taiwan 3. Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, New Taipei, 24205, Taiwan
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Abstract: | We propose and demonstrate a new AC-light emitting diode based visible light communication system, in which the message signal is up-converted to 400 kHz frequency band and combine with the 60 Hz AC-power from the outlet. A special design bias-tee circuit is first implemented to combine the message signal and the AC-power for minimizing the signal distortion. Thus, the spectra of both signals are well separated. A special design clock recovery is used to synchronize the AC-power with the message signal; hence the message signal can be correctly applied to the rectified AC-power cycle. |
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