Apparatus and method for transmitting and receiving visible light communication

摘要

A visible light communication (VLC) transmitting apparatus modulates source data to an orthogonal frequency division multiplexing (OFDM) symbol according to an OFDM modulation method, inserts a diffusion code that is allocated to the VLC transmitting apparatus into a frequency axis of the OFDM symbol, converts the OFDM symbol in which the diffusion code is inserted to a visible light modulation signal, and transmits the converted visible light modulation signal. Thereby, a signal of the VLC transmitting apparatus in which a VLC receiving apparatus wants can be easily detected.

主权项

1. A receiving method of a VLC receiving apparatus, the receiving method comprising:
detecting a visible light wireless signal; converting the visible light wireless signal to a digital signal; detecting a signal of a VLC transmitting apparatus wanting to receive using a diffusion code that is inserted into the digital signal; removing the diffusion code from the detected signal; and restoring a signal in which the diffusion code is removed to original data by demodulating with an OFDM method, wherein the detecting of a signal comprises:
calculating an auto-correlation value between a sequential sample signal of a signal into which the diffusion code is inserted among the digital signal and a diffusion code of the VLC transmitting apparatus wanting to receive; anddetecting a digital signal corresponding to a signal having a maximum value of the calculated auto-correlation value.