Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Title
Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications
Author(s)
장자순윤경수이창호[이창호]안강일[안강일]이림환[이림환]권재균
Keywords
OPTICAL WIRELESS COMMUNICATIONS; DISCRETE MULTITONE; DIMMING CONTROL; VARIABLE PPM; MODULATION; OFDM; SCHEME; TRANSMISSION; MITIGATION
Issue Date
201410
Publisher
OPTICAL SOC KOREA
Citation
JOURNAL OF THE OPTICAL SOCIETY OF KOREA, v.18, no.5, pp.459 - 465
Abstract
Visible light communications (VLC) using the intensity modulation of light-emitting diodes (LEDs) provides a new communication medium to overcome the shortage of radio spectrum, and allows reuse of LED lighting infrastructures. Orthogonal frequency-division multiplexing (OFDM) was introduced to VLC for its merits in mitigating the fading effects resulting from delay spread, and in avoiding low-frequency ambient interference. Noise and clipping are two major factors that degrade the performance of OFDM in VLC. A larger signal easily overcomes noise, but experiences impairment by clipping. Therefore, degradation due to clipping has a trade-off relationship with that due to noise, depending on the signal amplitude of OFDM. In this paper, the optimal signal amplitude in the trade-off is obtained by simulation when the dimming and LED intensity are given. The former indicates a user's requirement for lighting, and the latter represents the channel quality. The required LED intensity-to-noise ratio, as the channel quality that guarantees dimming as well as an adequate bit-error rate (BER), is also discussed.
URI
http://hdl.handle.net/YU.REPOSITORY/30646http://dx.doi.org/10.3807/JOSK.2014.18.5.459
ISSN
1226-4776
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공과대학 > 전자공학과 > Articles
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