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Ç¥ÁعøÈ£ TTAK.KO-10.1307-Part5 ±¸Ç¥ÁعøÈ£
Á¦°³Á¤ÀÏ 2022-12-07 ÃÑÆäÀÌÁö 11
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¿µ¹®Ç¥Áظí Physical Protocol Data Unit (PPDU) Frame Format for Optical Camera Communication - Part 5: Hybrid Two Spatial Phase Shift Keying and Orthogonal Frequency Division Multiplexing Modulation Scheme for Optical Vehicle Communication
Çѱ۳»¿ë¿ä¾à OFDM(Orthogonal Frequency-Division Multiplexing)Àº ´ÙÁß ¿î¹ÝÆÄ ÁÖÆļö¿¡¼­ µðÁöÅÐ µ¥ÀÌÅ͸¦ ºÎȣȭÇÏ´Â º¯Á¶ ¹æ¹ýÀÌ´Ù. °í¼Ó Åë½Å¿¡¼­ Áß¿äÇÑ ±â¼ú·Î, ´ë¿ªÆøÀ» Á÷±³ ºÎ¹Ý¼ÛÆÄ·Î ºÐÇÒÇÏ¿© ISI(Intersymbol Interference)·Î ÀÎÇÑ ¿Ö°îÀ» Á¦°ÅÇÑ´Ù. Ǫ¸®¿¡ º¯È¯ ¹æ¹ýÀ» »ç¿ëÇϸé OFDM ½Ã½ºÅÛÀÇ ºÎ¹Ý¼ÛÆÄ°¡ ½ÅÈ£ ¼º´É¿¡ ¿µÇâÀ» ¹ÌÄ¡Áö ¾Ê°í ¼­·Î °ãÄ¥ ¼ö ÀÖ´Ù. ¶ÇÇÑ Cyclic-Prefix°¡ OFDM ±âÈ£¿¡ Ãß°¡µÇ¾î ¿Ö°îÀ» ¹æÁöÇÑ´Ù.
2-PSK´Â IEEE 802.15.7-2018¿¡¼­ Ç¥ÁØÈ­µÈ ¿î¿ë ¸ðµåÀÌ´Ù. ÀÌ ¹æ½ÄÀº ÀÚµ¿Â÷ÀÇ ¶óÀÌÆ® Æä¾î°¡ ÀÖ´Â Â÷·® ¾ÖÇø®ÄÉÀ̼ǿ¡ ´õ ÀûÇÕÇϵµ·Ï Á¦¾ÈµÇ¾ú´Ù. ÇÑ ½ÖÀÇ Á¶¸íÀº µÎ °³ÀÇ Á¶¸í¿¡ ÀÇÇØ »ý¼ºµÇ´Â µÎ ÆÄÇüÀÇ À§»óÀ» Á¦¾îÇÏ¿© µ¥ÀÌÅ͸¦ Àü¼ÛÇÑ´Ù. S2-PSKÀÇ ÇÙ½ÉÀº ¼Û½Å±â°¡ µ¥ÀÌÅ͸¦ Àü¼ÛÇÒ ¶§ ÇÑ ½ÖÀÇ LED ÆÄÇü »çÀÌÀÇ °ü°è¸¦ Á¦¾îÇÏ´Â ​​°ÍÀÌ´Ù. ÀÌ º¯Á¶ ¹æ½Ä¿¡¼­ ºñÆ® 1Àº 2°³ÀÇ ¿ªÀ§»ó ÆÄÇüÀ» ÅëÇØ Àü¼Ûµµ°í, ºñÆ® 0Àº 2°³ÀÇ µ¿ÀÏÇÑ À§»ó ÆÄÇüÀ» ÅëÇØ Àü¼ÛµÈ´Ù.
±âÁ¸ÀÇ OFDM ¶Ç´Â S2-PSK¿Í ´Þ¸® µÎ °³ÀÇ ÆÄÇü OFDM°ú S2-PSK¸¦ °áÇÕÇÏ°í ÀÌ ÇÏÀ̺긮µå ÆÄÇüÀ» ´ÜÀÏ LED·Î Àü¼ÛÇÑ´Ù. OCC¸¦ À§ÇÑ ÇÏÀ̺긮µå OFDM ¹× S2-PSK ¹æ½Ä¿¡ ´ëÇÑ ÀÚ¼¼ÇÑ ³»¿ëÀº ¾Æ·¡ ¼½¼Ç¿¡¼­ ¼³¸íÇÑ´Ù. ±× ¿Ü¿¡µµ Hybrid S2-PSK OFDM(HS2PSK-OFDM)ÀÇ ±¸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 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.
S2-PSK is an operating mode being standardized at IEEE 802.15.7-2018. This scheme was proposed to be more suitable with vehicular applications with light pairs in cars. Pairs of lights transmit data by controlling the phase of two waveforms, which are created by a couple of lights.. The key of S2-PSK is to control the relationship between a pair of LED waveform when transmitter transfers data. In this modulation scheme, bit 0 is transmitted through waveforms with the two same-phase waveforms, when bit 1 is transmitted through two inverse-phase waveforms.
Unlike the conventional OFDM or S2-PSK, we combine two waveforms OFDM and S2-PSK and transmit this hybrid waveform with single LED. The more detail of the hybrid OFDM and S2-PSK scheme for OCC, we mention in the sections below. Besides that, we proposed the structure of the Hybrid S2-PSK and OFDM (HS2PSK-OFDM).
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