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Ç¥ÁعøÈ£ TTAK.KO-10.1308-Part1 ±¸Ç¥ÁعøÈ£
Á¦°³Á¤ÀÏ 2021-12-08 ÃÑÆäÀÌÁö 5
ÇѱÛÇ¥ÁØ¸í ±¤ÇÐ Ä«¸Þ¶ó Åë½Å ¹°¸®°èÃþ º¯Á¶ ¹æ½Ä Á¦1ºÎ: ´ÜÀÏ Ä«¸Þ¶ó¿ë ÇÏÀ̺긮µå Á÷±³ ÁÖÆļö ºÐÇÒ ´ÙÁßÈ­ ¿Â-¿ÀÇÁ Å°À×(Hybrid-OFDM OOK) º¯Á¶
¿µ¹®Ç¥Áظí Modulation Method for Optical Camera Communication Part 1. Hybrid Orthogonal Frequency Division Multiplexing On-Off Keying(Hybrid-OFDM OOK) Modulation for Single Camera
Çѱ۳»¿ë¿ä¾à Á÷±³ ÁÖÆļö ºÐÇÒ ´ÙÁß(Orthogonal Frequency-Division Multiplexing: OFDM)Àº ´ÙÁß ¹Ý¼ÛÆÄ ÁÖÆļö¿¡¼­ µ¥ÀÌÅ͸¦ µðÁöÅÐ ÀÎÄÚµùÇÏ´Â º¯Á¶ ¹æ½ÄÀÌ´Ù. °í¼Ó Åë½Å¿¡¼­ Áß¿äÇÑ ±â¼úÀÌ¸ç ½Éº¼ °£ °£¼·(Intersymbol Interference: ISI)À¸·Î ÀÎÇÑ ¿Ö°îÀ» Á¦°ÅÇϱâ À§ÇØ ´ë¿ªÆøÀ» Á÷±³ ºÎ¹Ý¼ÛÆÄ·Î ºÐÇÒ ÇÑ´Ù. ºÎ¹Ý¼ÛÆÄ °£ÀÇ Á÷±³¼ºÀ» ÀÌ¿ëÇÔÀ¸·Î½á OFDM ½Ã½ºÅÛÀÇ ºÎ¹Ý¼ÛÆÄ´Â ½ÅÈ£ ¼º´É¿¡ ¿µÇâÀ» ÁÖÁö ¾Ê°í ¼­·Î ÁßøµÉ ¼ö ÀÖ´Ù. ¶ÇÇÑ ¿Ö°îÀ» ¹æÁöÇϱâ À§ÇØ OFDM ½Éº¼¿¡ Cyclic-Prefix°¡ Ãß°¡µÈ´Ù.

Ä«¸Þ¶ó ¿Â¿ÀÇÁ Å°À×(C-OOK)Àº ¿Â¿ÀÇÁ Å°À×(OOK) ¹æ½ÄÀ» ±â¹ÝÀ¸·Î ¾ð´õ »ùÇøµµÈ º¯Á¶ ¹æ½Ä Áß ÇϳªÀÌ´Ù. C-OOKÀº ¼ÅÅÍ ¼Óµµ¿¡ Á¦ÇÑÀÌ ÀÖ´Â ´Ù¾çÇÑ ·Ñ¸µ ¼ÅÅÍ Ä«¸Þ¶ó¸¦ Áö¿øÇϵµ·Ï ¼³°èµÈ´Ù.

±âÁ¸ÀÇ OFDM ¶Ç´Â C-OOK¿Í ´Þ¸® OFDM°ú OOKÀÇ µÎ ÆÄÇüÀ» °áÇÕÇÏ¿© ÀÌ ÇÏÀ̺긮µå ÆÄÇüÀ» ´ÜÀÏ ¹ß±¤ ´ÙÀÌ¿Àµå(LED)·Î Àü¼ÛÇÑ´Ù. ±× ¿Ü¿¡µµ µÎ °³ÀÇ µ¥ÀÌÅÍ ½ºÆ®¸²¿¡ ´ëÇØ ´ÜÀÏ ·Ñ¸µ ¼ÅÅÍ Ä«¸Þ¶ó¸¦ ±â¹ÝÀ¸·Î µÎ °³ÀÇ ÆÄÇüÀÌ µðÄÚµùµÈ´Ù. ±¤ Ä«¸Þ¶ó Åë½Å(OCC)À» À§ÇÑ Hybrid OFDM-OOK ±¸Á¶¿Í ÀÚ¼¼ÇÑ ³»¿ëÀ» Á¦°øÇÑ´Ù.
¿µ¹®³»¿ë¿ä¾à The Orthogonal Frequency-division multiplexing (OFDM) is a modulation method of encoding digital data on multiple carrier frequencies. It is importance technique in high-speed communication, the bandwidth is divided into the orthogonal sub-carrier to eliminate the distortion caused by Intersymbol Interference(ISI). By using Fourier Transform method, the sub-carrier in OFDM system can be overlap on each other without effecting to signal performance. Besides that, the Cyclic-Prefix is added to OFDM symbol making to combat the distortion.

The camera on-off keying (C-OOK) is one of undersampled modulation schemes, based on OOK scheme. C-OOK is designed to support a wide range of rolling shutter cameras, which have limitation on the shutter speed.

Unlike the conventional OFDM or C-OOK, we combine two waveforms OFDM and OOK and transmit this hybrid waveform with single LED. Besides that, the two waveforms will be decoded based on single rolling shutter camera for two data streams. The more detail of the hybrid OFDM-OOK scheme for OCC, we mention in the sections below. Besides that, we proposed the structure of the hybrid OFDM-OOK.
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