한국전자통신학회논문지 (The Journal of the Korea institute of electronic communication sciences)

한국전자통신학회 (Korea Institute of Electronic Communication Science)
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직교 주파수분할다중화 시스템을 위한 채널간간섭 자기소거법

An Interchannel Interference Self-Cancellation Scheme for the Orthogonal Frequency Division Multiplexing System

  • 진혜걸 (경상대학교 대학원 전기전자공학과) ;
  • 강석근 (경상대학교 반도체공학과)
  • 투고 : 2018.05.02
  • 심사 : 2018.08.15
  • 발행 : 2018.08.31
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초록

주파수 오프셋으로 인하여 직교 주파수분할다중화의 수신 심볼에는 채널간간섭이 발생된다. 채널간간섭 자기소거법은 직교 주파수분할다중화 심볼의 부채널에 할당되는 신호를 조정함으로써 다른 부채널에 의한 간섭을 상쇄시키는 기술이다. 기존 인접심볼반복법은 원거리 부채널에 의한 간섭을 감소시키기는 하지만 가장 인접한 부채널에 의한 간섭은 완화시키지 못하거나 심지어는 증가시키는 경우도 있다. 이러한 문제점을 해결하기 위하여 본 논문에서는 새로운 인접심볼반복 기반 채널간간섭 자기소거법을 제안하고 성능을 분석한다. 여기서는 연속된 3개 부채널의 간섭계수를 이용하여 구한 t-파라미터를 적용한다. 그 결과, 제안된 방법은 원거리 부채널에 의한 영향을 감소시키는 능력은 기존 방법과 거의 동일한 반면 최인접 부채널에 의한 채널간간섭은 크게 감소시킬 수 있는 것으로 나타났다.

Due to the frequency offset, interchannel interference (ICI) is occurred in the received symbols of the orthogonal frequency division multiplexing (OFDM) systems. The ICI self-cancellation (ICI-SC) technique appropriately adjusts the subchannel signal assignment of the OFDM symbols, thereby canceling the interference caused by other subchannels. The conventional adjacent symbol repetition (ASR) method can reduce the interference caused by remote subchannels. However, it may not mitigate or even increases the ICI produced by some nearest subchannels. To solve the problem, a new ASR based ICI-SC technique is proposed and its performance is analyzed in this paper. Here, a t-parameter obtained by the interference coefficients of 3 successive subchannels is applied. As a result, the proposed method has the same capability to reduce the influence of remote subchannels. However, it can reduce the ICI caused by the nearest subchannels significantly.

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참고문헌

  1. A. Bahai, B. Saltzberg, and M. Ergen, Multi-Carrier Digital Communications: Theory and Applications of OFDM. New York: Springer, 2004.
  2. T. Pollet, M. VanBladel, and M. Moeneclay, "BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise," IEEE Trans. Commun., vol. 43, no. 2/3/4, Feb./Mar./Apr. 1994, pp. 191-193.
  3. P. Moose, "A technique for orthogonal frequency division multiplexing frequency offset correction," IEEE Trans. Commun., vol. 42, no. 10, Oct. 1994, pp. 2908-2914. https://doi.org/10.1109/26.328961
  4. S. Swang, "Channel estimation based on LMS algorithm for MIMO-OFDM system," J. of the Korea Institute of Electronic Communication. Sciences, vol. 7, no. 6, Dec. 2012, pp. 1455-1461.
  5. W. Cho, "A measurement study of midamble based channel estimation in IEEE 802.11p WAVE system," J. of the Korea Institute of Electronic Communication. Sciences, vol. 8, no. 5, May 2013, pp. 733-738. https://doi.org/10.13067/JKIECS.2013.8.5.733
  6. K. Him and B. Seo, "Efficient ICI self-cancellation scheme for OFDM systems," ETRI J., vol. 36, no. 4, Aug. 2014, pp. 537-544. https://doi.org/10.4218/etrij.14.0113.0747
  7. M. Rahman, P. Dey, and M. Rashid, "An improved ICI self cancellation scheme for OFDM systems under various channels," Int. J. Electrical and Computer Eng., vol. 6, no. 2, Apr. 2016, pp. 690-699.
  8. Y. Zhao and S. Gaggman, "Intercarrier interference self-cancellation scheme for OFDM mobile communication systems," IEEE Trans. Commun., vol. 49, no. 7, July 2001, pp. 1185-1191. https://doi.org/10.1109/26.935159
  9. A. Seyedi and G. Saulnier, "General ICI self-cancellation scheme for OFDM systems," IEEE Trans. Veh. Technol., vol. 54, no. 1, Jan. 2005, pp. 198-210. https://doi.org/10.1109/TVT.2004.838849
  10. S. Habib, R. Sayed, H. Hamed, and M. Fikri, "New ICI self cancellation scheme for OFDM system," Int. J. of Computer and Commun. Eng., vol. 3, no. 1, Jan. 2014, pp. 1-5. https://doi.org/10.7763/IJCCE.2014.V3.281