한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지
DOI QR코드

DOI QR Code

선택적 감쇄환경에서 분산안테나 간 주파수 오차 환경에 강인한 알라무티부호화 직교주파수분할다중방식 기반 간섭 제거기법

Multiple Frequency Offsets Cancellation Scheme Based on Alamouti Coded OFDM for Distributed Antenna Systems in Selective Fading Channel

  • 김봉석 (영남대학교 정보통신공학과 광대역무선통신연구실) ;
  • 최권휴 (영남대학교 정보통신공학과 광대역무선통신연구실)
  • 투고 : 2013.07.22
  • 심사 : 2013.11.12
  • 발행 : 2013.12.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

선택적 감쇄채널 환경에서 분산안테나 간 주파수 오차에 의한 부반송파 간 간섭을 효율적으로 제거하는 알라무티부호화 직교주파수분할다중방식(Alamouti coded OFDM) 기반 간섭제거 기법을 제안한다. 일반적으로 간섭제거 방식에서는 초기검출 심볼로부터 간섭신호를 추정하고 추정한 간섭신호를 원래 수신 신호에서 제거함으로써 성능을 개선시킨다. 이때 초기 검출 심볼의 정확도가 높을수록 제거되는 부반송파간 간섭량 또한 증가하므로 간섭제거 방식에서 초기 검출심볼의 정확도는 매우 중요하다. 제안하는 방식은 초기 검출심볼을 얻는 과정에서 주파수 오차에 의한 부반송파간 간섭의 일부를 자체제거하는 알라무티부호화 직교주파수분할다중방식을 사용함으로써 그 정확도를 높인다. 따라서, 제안하는 방식은 단 1회의 제거과정을 수행함에도 수회의 반복연산을 필요로 하는 기존의 알라무티부호화 직교주파수분할다중방식을 사용한 간섭제거 방식에 비해 개선된 성능을 가진다.

We propose a cancellation algorithm based on Alamouti coded OFDM to mitigate ICI due to Frequency Offset (FO) between distributed antennas in the frequency selective fading channel. In the cancellation algorithm, the interference signal is estimated by using the initial detection symbol and then the estimated interference signal is subtracted from the received signal. As the accuracy of initial symbol increases, ICI cancellation becomes more significant. Therefore, the accuracy of the initial detection symbols is very important in the cancellation algorithm. The proposed scheme improves the accuracy of the initial detection symbol by employing an ICI self-cancellation scheme. The proposed cancellation scheme with only one iteration achieves better performance compared to the conventional cancellation schemes with many times iterations based on the conventional Alamouti coded OFDM.

키워드

참고문헌

  1. B. Kim and K. Choi, "Frequency Offset-Tolerant Distributed Alamouti Coded OFDM," Submitted to IEEE Trans. Wireless Commun., [Online]. Available: http://bwc.yu.ac.kr/paper1303.pdf.
  2. B. Kim, J. Lee, and K. Choi, "ICI self-cancelled Alamouti coded OFDM for distributed antenna systems - Part II : under selective fading channel," in Proc. Joint Conf. Commun. Inform. (JCCI 2013), pp. 1-2, Gyeongju, Korea, May 2013.
  3. K. Choi, "Inter-carrier interference-free Alamouti-coded OFDM for cooperative systems with frequency offsets in non-selective fading environments," IET Commun., vol. 5, no. 15, pp. 2125-2129, Oct. 2011. https://doi.org/10.1049/iet-com.2011.0131
  4. Z. Li and X.-G. Xia, "An Alamouti coded OFDM transmission for cooperative systems robust to both timing errors and frequency offsets," IEEE Trans. Wireless Commun., vol. 7, no. 5, pp. 1839-1844, May 2008. https://doi.org/10.1109/TWC.2008.070443
  5. H. Wang, X.-G. Xia, and Q. Yin, "Distributed space-frequency codes for cooperative communication systems with multiple carrier frequency offsets," IEEE Trans. Wireless Commun., vol. 8, no. 2, pp. 1045-1055, Feb.
  6. Z. Li, D. Qu, and G. Zhu, "An equalization technique for distributed STBC-OFDM system with multiple carrier frequency offsets," in Proc. IEEE Wireless Commun. Networking Conf. (WCNC 2006), pp. 839-843, Las Vegas, U.S.A., Apr. 2006.
  7. Q. Huang, M. Ghogho, D. Ma, and J. Wei, "Low-complexity data-detection algorithm in cooperative SFBC-OFDM systems with multiple frequency offsets," IEEE Trans. Veh. Technol., vol. 59, no. 9, pp. 4614-4620, Nov. 2010. https://doi.org/10.1109/TVT.2010.2081695
  8. Y. J. Kim, H. Lee, H. K. Chung, and Y. S. Cho, "An iterative decoding technique for cooperative STBC-OFDM systems with multiple carrier frequency offsets," in Proc. IEEE 18th Int. Symp. Personal, Indoor, Mobile Radio Commun. (PIMRC 2007), pp. 1-4, Athens, Greece, Sep. 2007.
  9. E. Jeon, J. Seo, J. Yang, J. Paik, and D. Kim, "Iterative detection and ICI cancellation for MISO-mode DVB-T2 system with dual carrier frequency offsets," KSII Trans. Internet Inform. Syst. (TIIS), vol. 6, no. 2, pp. 702-720, Feb. 2012. https://doi.org/10.3837/tiis.2012.02.015
  10. Y. Zhang and J. Zhang, "Multiple CFOs compensation and BER analysis for cooperative communication systems," in Proc. IEEE Wirless Commun. Networking Conf. (WCNC 2009), pp. 1-6, Budapest, Hungary, Apr. 2009.
  11. T. Lu, H. Lin, and T. Sang, "An SFBC-OFDM receiver to combat multiple carrier frequency offsets in cooperative communications," in Proc. IEEE Int. Symp. Personal, Indoor, Mobile Radio Commun. (PIMRC 2010), pp. 899-904, Istanbul, Turkey, Sep. 2010.
  12. J. Lee, H. Lin, and T. Sang, "An SFBC-OFDM receiver with MLSE equalizer to combat multiple frequency offsets," in Proc. IEEE Int. Symp. Circuits Syst. (ISCAS 2012), pp. 1524-1527, Seoul, Korea, May 2012.
  13. J. Park and H. Kim, "An efficient ICI self-cancellation method with frequency offset and phase noise in OFDM systems," J. Korea Inform. Commun. Soc. (KICS), vol. 34, no. 2, pp. 155-163, Feb. 2009.
  14. S. M. Alamouti, "Simple transmitter diversity scheme for wireless communications," IEEE J. Sel. Areas Commun., vol. 16, no. 8, pp. 1451-1458, Oct. 1998. https://doi.org/10.1109/49.730453
  15. S. Sesia, I. Toufik, and M. Baker, LTE: The UMTS Long Term Evolution, John Wiley and Sons, 2009.