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Á¦°³Á¤ÀÏ 2019-12-11 ÃÑÆäÀÌÁö 11
ÇѱÛÇ¥ÁØ¸í ·Ñ¸µ ¼ÅÅÍ ±¤ Ä«¸Þ¶ó Åë½ÅÀ» À§ÇÑ Á÷±³ ÁÖÆļö ºÐÇÒ ´ÙÁß Åë½Å(OFDM) ¹°¸®°èÃþ ÇÁ·ÎÅäÄÝ µ¥ÀÌÅÍ ´ÜÀ§(PPDU) ÇÁ·¹ÀÓ Çü½Ä
¿µ¹®Ç¥Áظí OFDM PPDU Frame Format for Rolling Shutter Optical Camera Communication
Çѱ۳»¿ë¿ä¾à Á÷±³ ÁÖÆļö ºÐÇÒ ´ÙÁß Åë½Å(OFDM)Àº ´ÙÁß Ä³¸®¾î ÁÖÆļö¿¡¼­ µðÁöÅÐ µ¥ÀÌÅ͸¦ ÀÎÄÚµùÇÏ´Â º¯Á¶ ¹æ¹ýÀÌ´Ù. °í¼Ó Åë½Å¿¡¼­ Á߿伺À» °®´Â ±â¼ú·Î¼­ ISI(Intersymbol Interference)¿¡ ÀÇÇÑ ¿Ö°îÀ» Á¦°ÅÇϱâ À§ÇØ ´ë¿ªÆøÀ» Á÷±³ ºÎ¹Ý¼ÛÆÄ·Î ³ª´«´Ù. Ǫ¸®¿¡ º¯È¯(Fourier Transform) ¹æ¹ýÀ» »ç¿ëÇÔÀ¸·Î½á, OFDM ½Ã½ºÅÛÀÇ ¼­ºê-ij¸®¾î´Â ½ÅÈ£ ¼º´É¿¡ ¿µÇâÀ» ¹ÌÄ¡Áö ¾ÊÀ¸¸é¼­ ¼­·Î ÁßøµÉ ¼ö ÀÖ´Ù. °Ô´Ù°¡ Cyclic-Prefix´Â ¿Ö°îÀ» ¾ø¾Ö±â À§ÇØ OFDM ½É¹ú¿¡ Ãß°¡µÈ´Ù.
±âÁ¸ÀÇ OFDM°ú ´Þ¸® ·Ñ¸µ OFDMÀº ·Ñ¸µ ¼ÅÅÍ Ä«¸Þ¶óÀÇ ·Ñ¸µ È¿°ú¸¦ »ç¿ëÇÏ¿© µ¥ÀÌÅ͸¦ Àü¼ÛÇÑ´Ù. ·Ñ¸µ È¿°ú¸¦ ÀÌ¿ëÇÏ¿© OFDM ½É¹úÀÇ µ¥ÀÌÅÍ ÇÁ·¹ÀÓÀ» Àü¼ÛÇϱâ À§ÇØ LEDÀÇ ÁøÆøÀ» Á¶Á¤ÇÒ ¼ö ÀÖ´Ù. º» Ç¥ÁØ¿¡¼­´Â ·Ñ¸µ OFDM ¹æ½Ä¿¡ ´ëÇÑ ¼¼ºÎ ³»¿ëÀ» ¼³¸íÇÑ´Ù. ±× ¿Ü¿¡µµ ·Ñ¸µ OFDMÀ» À§ÇÑ PPDU ±¸Á¶¸¦ Á¦¾ÈÇÑ´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 orthogonal sub-carrier to eliminate the distortion caused by Intersymbol Interference(ISI). By using Fourier Transform method, sub-carrier in OFDM system can be overlap on each other without effecting to signal performance. Moreover, Cyclic prefix is added to OFDM symbol making to combat the distortion.

Unlike conventional OFDM, Rolling OFDM use rolling effect of rolling-shutter cameras to transmit data. By using rolling effect, we can adjust the amplitude of LED to transmit the data frame of OFDM symbol. The more detail of rolling-OFDM scheme, we mention in the sections below. Furthermore, we proposed the PPDU structure for rolling-OFDM.
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°ü·ÃÆÄÀÏ TTAK.KO-10.1161.pdf TTAK.KO-10.1161.pdf            

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