Optical wireless data transmission systems for indoor\r\napplication are usually affected by optical interference induced\r\nby sun light and artificial ambient lights. This paper presents a\r\ncharacterization of the optical interference produced in visible\r\nlight communication (VLC) systems and proposes an effective\r\nscheme to solve it. Regarding the sun light noise and some\r\nartificial light noises reduction, the common method is to adapt\r\nthe optical bandpass filter which can distinguish the wavelength\r\nbetween interference lights and information lights. However, for\r\nsome photo-electric systems, the visible lights from the\r\ntransmitters occupy the same wavelength range, in this case, the\r\noptical bandpass filter would not reduce the interference noise\r\nfrom the other user, for example, the optical interference caused\r\nby multi-user access of the optical medium. Therefore, we\r\nproposed a novel scheme, adaptive optical parallel interference\r\ncancellation (AOPIC) to reduce the multiple access interference\r\n(MAI) and multiple user interference (MUI) induced by multiuser\r\naccess of the optical medium, the conventional parallel\r\ninterference cancellation (PIC) is analyzed as the comparison.\r\nThrough the simulation results, we can conclude that the AOPIC\r\nscheme shows much better bit error rate (BER) performance\r\nthan the conventional PIC with the increasing number of user.
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