Patent ID: 8750719
Filing Date: 2014-06-10
Classification: H01L,H04B

Abstract:
1. A visible light communication receiver comprising: a receiving unit configured to receive a visible light signal from a blue light-excited white LED driven by a driving current signal generated by adding a rising pulse and a falling pulse to a rising edge and a falling edge of a transmission data, respectively, the transmission data being encoded according to a DC-free RLL code having a minimum run of 1 and NRZI-modulated prior to adding the rising pulse and the falling pulse; a photoelectric converter configured to convert the visible light signal received by the receiving unit into an electrical signal; an equalizer configured to equalize the electrical signal generated by the photoelectric converter to a duobinary signal; a discriminator configured to compare a level of the duobinary signal to a first threshold and a second threshold higher than the first threshold to generate a 3-value signal; a maximum-likelihood decoder configured to ML-decode the 3-value signal generated by the discriminator to output a decoded signal; and a decoder configured to RLL decode the decoded signal outputted by the maximum-likelihood decoder.