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Ç¥ÁعøÈ£ TTAK.KO-10.1162 ±¸Ç¥ÁعøÈ£
Á¦°³Á¤ÀÏ 2019-12-11 ÃÑÆäÀÌÁö 10
ÇѱÛÇ¥ÁØ¸í ·Ñ¸µ ¼ÅÅÍ ±¤ Ä«¸Þ¶ó Åë½ÅÀ» À§ÇÑ ´ÙÁß ÀÔ·Â ¹× ´ÙÁß Ãâ·Â Á÷±³ ÁÖÆļö ºÐÇÒ ´ÙÁß Åë½Å(MIMO-OFDM) º¯Á¶ ¹æ½Ä
¿µ¹®Ç¥Áظí Multiple Input Multiple Output OFDM (MIMO-OFDM) PHY Modulation Scheme for Rolling Shutter Optical Camera
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°¡ ¼øȯ ÇÁ¸®ÇȽº´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.
·Ñ¸µ OFDM ¹æ½ÄÀ¸·Î ÇϳªÀÇ LED¸¸ »ç¿ëÇÏ´Â ´ë½Å, ·Ñ¸µ MIMO-OFDM ¹æ½ÄÀº ·Ñ¸µ OFDM º¯Á¶¿Í ÇÔ²² ¸ÖƼ LED¸¦ »ç¿ëÇÒ ¼ö ÀÖ´Ù. ¸ÖƼ LED¸¦ »ç¿ëÇϸé LEDÀÇ ¼ö¿¡ µû¶ó ÀÌ ¹æ½ÄÀÇ µ¥ÀÌÅÍ ¼Óµµ°¡ ¸¹ÀÌ Áõ°¡ÇÑ´Ù. Ab ºñÆ®¸¦ »ç¿ëÇÔÀ¸·Î½á, ·Ñ¸µ´ÙÁß ÀÔ·Â ¹× ´ÙÁß Ãâ·Â Á÷±³ ÁÖÆļö ºÐÇÒ ´ÙÁß Åë½Å MIMO-OFDM ¹æ½ÄÀº ÇϳªÀÇ À̹ÌÁö¿¡¼­ ÆÐŶµéÀ» ¼ø¼­´ë·Î °ËÃâÇÏ°í ÇÕº´ÇÒ ¼ö ÀÖ´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.
Instead to just using one LED as rolling OFDM scheme, rolling-MIMO-OFDM scheme can use multi-LED with rolling-OFDM modulation. By using multi-LED, the data rate of the scheme is increased many time depending on the number of LED. By using Ab bit, Rolling MIMO-OFDM scheme can detect and assemble in order packets in one image.
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°ü·ÃÆÄÀÏ TTAK.KO-10.1162.pdf TTAK.KO-10.1162.pdf            

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