2021
DOI: 10.3390/s21041060
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Ambient LED Light Noise Reduction Using Adaptive Differential Equalization in Li-Fi Wireless Link

Abstract: For Li-Fi wireless links based on a white light emitting diode, an adaptive differential equalization (ADE) technique that reduces various noises such as interference noise and shot one generated from ambient light sources is pro-posed. The ADE technique reduces noise by taking advantage of the fact that the derivative between adjacent sampling points of signal with digital waveform is very different from that of noise with the random analog waveform. Furthermore, a weighting function that reflects the Poisson… Show more

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Cited by 8 publications
(4 citation statements)
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References 30 publications
(48 reference statements)
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“…As long as the original signal contains the target signal, a certain fluctuation will occur when calculating the amplitude difference, and this fluctuation is not related to the amplitude. erefore, the threshold of the difference signal can accurately filter out the noise doped by the original signal [31][32][33].…”
Section: Unstructured Data Processingmentioning
confidence: 99%
“…As long as the original signal contains the target signal, a certain fluctuation will occur when calculating the amplitude difference, and this fluctuation is not related to the amplitude. erefore, the threshold of the difference signal can accurately filter out the noise doped by the original signal [31][32][33].…”
Section: Unstructured Data Processingmentioning
confidence: 99%
“…Sunlight induced shot noise in electronic components of the receiver front-end may be mitigated by optical filtering [32], selective receiver combining [33], or by varying the optimum receiver bandwidth with the temporal changes in ambient light and daytime [34]. Adaptive differential equalization has been used to reduce the effect of optical interference and shot noise caused by the ambient light on the VLC receiver's SNR [35]. Similarly, [36] proposed an average voltage tracking circuit to detect and cancel the noise voltage produced by ambient light sources in low SNR receivers.…”
Section: Ambient Light Suppression In Electronic Domainmentioning
confidence: 99%
“…Therefore, OCC is considered one of the most ideal candidates for optical MIMO. Further information on each OWC subcategory is well-described in [9][10][11][12]. The LED-to-LED technique is a communication scheme employing LEDs for both transmitters and receivers, and transmits the information via the IR/VL/UV spectrum.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, OCC is considered one of the most ideal candidates for optical MIMO. Further information on each OWC subcategory is well-described in [ 9 , 10 , 11 , 12 ].…”
Section: Introductionmentioning
confidence: 99%