2009³â Ãß°èÇмú´ëȸ
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ÇѱÛÁ¦¸ñ(Korean Title) |
OFDM ½Ã½ºÅÛ¿¡¼ PAPR °¨¼Ò±â¹ýÀ» Àû¿ëÇÑ ´ÙÇ×½Ä »çÀü¿Ö°î ±â¹ý¿¡ °üÇÑ ¿¬±¸ |
¿µ¹®Á¦¸ñ(English Title) |
A Study on Polynomial Pre-ditsortion Technique Using PAPR Reduction Methode |
ÀúÀÚ(Author) |
¹ÚºñÈ£
±è¿ÏÅÂ
Á¶¼ºÁØ
Bee-ho Park
Wan-tae Kim
Sung-joon Cho
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¿ø¹®¼ö·Ïó(Citation) |
VOL 13 NO. 02 PP. 0160 ~ 0163 (2009. 10) |
Çѱ۳»¿ë (Korean Abstract) |
HPA(High Power Amplifier)´Â ¹«¼±Åë½Å ½Ã½ºÅÛ¿¡¼ ÇʼöÀûÀ¸·Î ¿ä±¸µÇ´Â ¿ä¼Ò ÁßÀÇ Çϳª´Ù. ±×·¯³ª Àü·Â ÁõÆø±â´Â ºñ¼±Çü Ư¼ºÀ» °¡Áö°í ÀÖÀ¸¸ç ½ÅÈ£ÀÇ ºñ¼±Çü ¿Ö°îÀ» À¯¹ß ½ÃÅ°°í ÀÎÁ¢Ã¤³Î °£¼·À» ½ÉȽÃÄÑ ½Ã½ºÅÛÀÇ È¿À²À» ¶³¾î¶ß¸°´Ù. ÀÌ·¯ÇÑ ¹®Á¦Á¡À» ÇØ°áÇϱâ À§ÇØ ¸¹Àº ¼±ÇüÈ ±â¹ýµéÀÌ Á¦½ÃµÇ¾î¿Ô´Ù. ´ÙÇ×½Ä »çÀü¿Ö°î ±â¹ýÀº ÁõÆø±â·Î ÀԷµǴ ½ÅÈ£°¡ ¹Ì¸® ÁõÆø±âÀÇ ¿ª Ư¼ºÀ» °®µµ·Ï ÇÏ´Â ±â¹ýÀ¸·Î ´ÙÇ×½ÄÀ» ÅëÇÏ¿© ÁõÆø±â¸¦ ¸ðµ¨¸µÇϱ⠶§¹®¿¡ ¼ö·Å ¼Óµµ°¡ ºü¸£°í ´Ù¸¥ ±â¹ýµé¿¡ ºñÇØ ÁÁÀº ¼º´ÉÀ» º¸ÀδÙ. ÇÏÁö¸¸ ´ÙÇ×½ÄÀ¸·Î ¿ª ºñ¼±Çü Ư¼ºÀ» ±¸ÇÒ °æ¿ì, ÁõÆø±âÀÇ Æ÷È¿µ¿ª¿¡¼ ¿ª ºñ¼±Çü Ư¼ºÀÌ °ÅÀÇ ¹«ÇÑ´ë°¡ µÇ¾î¾ß Çϱ⠶§¹®¿¡ ¼±ÇüȱâÀÇ ¼º´ÉÀÌ Å©°Ô ¶³¾îÁø´Ù. º» ³í¹®¿¡¼´Â ÀÌ·¯ÇÑ ¹®Á¦Á¡À» ÇØ°áÇϱâ À§ÇÏ¿© PAPR(Peak-to-Average Power Ratio) ±â¹ýÀ» Àû¿ëÇÏ¿© ´ÙÇ×½Ä »çÀü¿Ö°î ±â¹ýÀÇ ¼º´ÉÀ» Çâ»ó ½ÃÄ×´Ù.
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¿µ¹®³»¿ë (English Abstract) |
HPA is one of the most essential device in wireless communication systems. However, because of nonlinear characteristic of HPA transmit signal is distorted with both amplitude and phase, this distortion leads to deepening adjacent channel interference. So a technique to change the nonlinear characteristic with linear characteristic is needed. In this paper, Among all techniques, we adopts a polynomial pre-distortion technique. Pre-distorted signal by pre-distorter has opposite characteristic with HPA. In result, the signal passed through pre-distorter and HPA has linear characteristic. But the accuracy of opposite characteristic of HPA is decreased at near portion of saturation point. So we improve the accuracy of opposite characteristic of HPA by using PAPR reduction method. In this paper, an adaptive polynomial pre-distortion technique is introduced to counterbalance the nonlinear characteristic of the transmit power amplifier, and a PAPR reduction method is introduced to increase efficiency of polynomial pre-distorter.
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Å°¿öµå(Keyword) |
OFDM
HPA
PAPR
Pre-distortion
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ÆÄÀÏ÷ºÎ |
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