Çѱ¹Á¤º¸Åë½ÅÇÐȸ ³í¹®Áö (Journal of the Korea Institute of Information and Communication Engineering)
ÇѱÛÁ¦¸ñ(Korean Title) |
±ÙÁ¢ÇÑ ÀÌÁߴ뿪 ½ÅÈ£¿¡ ´ëÇÑ µðÁöÅÐ ÀüÄ¡¿Ö°î ±â¹ý |
¿µ¹®Á¦¸ñ(English Title) |
Digital Predistortion for Closely Spaced Dual-Band Signals |
ÀúÀÚ(Author) |
Á¤ÀǸ²
¿ÀÁÖÇö
±èµµ°æ
Eui-Rim Jeong
Joo-Hyun Oh
Do-Kyoung Kim
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¿ø¹®¼ö·Ïó(Citation) |
VOL 22 NO. 12 PP. 1684 ~ 1690 (2018. 12) |
Çѱ۳»¿ë (Korean Abstract) |
±ÙÁ¢ÇÑ ÀÌÁߴ뿪 ½ÅÈ£¿¡ ´ëÇÑ »õ·Î¿î µðÁöÅÐ ÀüÄ¡¿Ö°î ±â¹ýÀ» Á¦¾ÈÇÑ´Ù. º» ³í¹®¿¡¼ °í·ÁÇÏ´Â ½Ã½ºÅÛÀº ÀÌÁߴ뿪 ½ÅÈ£¸¦ ÇÑ °³ÀÇ Àü·ÂÁõÆø±â·Î ÁõÆøÇÏ´Â ¼Û½Å±âÀÌ´Ù. ÀÌ °æ¿ì Àü·ÂÁõÆø±â Ãâ·Â½ÅÈ£´Â µÎ ´ë¿ª ½ÅÈ£ÀÇ ±³Â÷º¯Á¶ ¹× »óÈ£º¯Á¶¿¡ ÀÇÇØ ¿Ö°îÀÌ ¹ß»ýÇÑ´Ù. ƯÈ÷ µÎ ´ë¿ªÀÌ °¡±î¿ï ¶§¿¡´Â °¢ ´ë¿ª¿¡¼ »óÈ£º¯Á¶¿¡ ÀÇÇØ ¹ßÇàÇÑ ½ºÆåÆ®·³ÀÌ ¼·Î °ãÄ¥ ¼ö ÀÖ°í ÀÌ´Â ÀüÄ¡¿Ö°î ¼º´ÉÀ» ÀúÇϽÃŲ´Ù. ÀÌ·¯ÇÑ ¹®Á¦¸¦ ÇØ°áÇϱâ À§Çؼ Á¦¾ÈÇÏ´Â ±â¹ýÀº ¸ÕÀú Àü·ÂÁõÆø±â Ư¼ºÀ» ÃßÁ¤ÇÏ°í ÀÌ·¸°Ô ÃßÁ¤ÇÑ Àü·ÂÁõÆø±â Ư¼ºÀ» ¹ÙÅÁÀ¸·Î ÀüÄ¡¿Ö°î °è¼ö¸¦ ÃßÃâÇÑ´Ù. ÀÌ·¯ÇÑ µÎ ´Ü°è¸¦ ÅëÇØ ÀüÄ¡¿Ö°î °è¼ö¸¦ ±¸ÇÏ¸é ±ÙÁ¢ÇÑ ÀÌÁߴ뿪 ½ÅÈ£¿¡ ´ëÇؼµµ ¼·Î °£¼· ¾øÀÌ ÀüÄ¡¿Ö°îÀÌ µ¿ÀÛÇÒ ¼ö ÀÖ´Ù. Á¦¾ÈÇÏ´Â ±â¹ýÀº ÄÄÇ»ÅÍ ¸ðÀǽÇÇèÀ» ÅëÇØ °ËÁõÇϴµ¥, ¸ðÀǽÇÇè °á°ú¿¡ µû¸£¸é Á¦¾ÈÇÏ´Â ±â¹ýÀÌ ±âÁ¸ÀÇ ÀÌÁߴ뿪 ÀüÄ¡¿Ö°î ¹æ¹ýº¸´Ù ¿ì¼öÇÑ ¼º´ÉÀ» º¸ÀδÙ.
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¿µ¹®³»¿ë (English Abstract) |
A new digital pre-distortion (DPD) technique for closely spaced dual-band signals is proposed. In the system under consideration, dual-band signals are amplified by a single broadband power amplifier (PA) at a transmitter. The PA output is distorted by cross-modulation between the two bands as well as their own inter-modulation distortion. Especially, if the two bands are placed in close proximity to each other, their spectral regrowths due to in-band intermodulation overlap with each other, which degrades DPD performance. To solve this problem, we propose a new DPD technique where the dual-band PA characteristics are estimated first, and then the DPD parameters are obtained from the estimated PA characteristics. By finding the DPD parameters through two steps, pre-distortion can perform well for the closely-spaced dual band signals. The proposed technique is verified through computer simulation. Simulation result shows that the proposed method performs better than the conventional method for closely-spaced dual band signals.
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Å°¿öµå(Keyword) |
±ÙÁ¢´ë¿ª ÀÌÁߴ뿪
µðÁöÅÐ ÀüÄ¡¿Ö°î
Àü·ÂÁõÆø±â
´ÙÇ×½Ä
Closely spaced dual-band
Digital pre-distortion
Power amplifier identification
Polynomial
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ÆÄÀÏ÷ºÎ |
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