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

  • 제41권1호
  • /
  • Pages.83-85
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  • 2016
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  • 1226-4717(pISSN)
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  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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고속 시변 채널 OFDM을 위한 안정화된 LS 신호검출

Regularized LS Signal Detection for OFDM in Fast Time Varying Channels

  • Lim, Dongmin (Department of Electronic Engineering, Gyeongsang National University)
  • 투고 : 2015.12.01
  • 심사 : 2015.12.18
  • 발행 : 2016.01.31
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초록

LS 신호검출 OFDM은 채널 행렬이 불량 조건이 될 확률이 증가하여 고속 시변 채널에서 성능이 저하된다. LS 신호검출의 성능저하를 방지하기 위하여 다양한 안정화 방식이 적용되고 있다. 본 논문에서는 변조방식의 특성이 반영된 실행중지 기준을 적용한 CGLS 방식을 제안하였으며 최적의 LMMSE에 근접한 성능을 얻을 수 있었다.

The OFDM with LS signal detection performs worse in fast time varying channels as the channel matrix has higher chance of becoming ill-conditioned. Various regularization methods are applied to avoid performance degradation in LS signal detection. In this paper, we proposed a CGLS method with the stopping criteria imposed by the characteristics of the modulation method, which shows performance comparable to that of the optimal LMMSE.

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참고문헌

  1. A. Bjorck, Numerical Methods for Least Squares Problems, Philadelphia: SIAM, 1996.
  2. P. C. Hansen, Rank-Deficient and Discrete Ill-Posed Problems - Numerical Aspects of Linear Inversion, Philadelphia: SIAM, 1998.
  3. D. Lim, "Performance improvement of low complexity LS channel estimation for OFDM in fast time varying channels," J. IEEK, vol. 49-TC, no. 8, pp. 25-32, Aug. 2012.
  4. D. S. Watkins, Fundamentals of Matrix Computations, 3rd Ed., New Jersey: John Wiley & Sons, Inc., 2010.
  5. T. Hrycak, S. Das, and G. Matz, "Low complexity equalization for doubly selective channels modeled by a basis expansion," IEEE Trans. Signal Process., vol. 58, no. 11, pp. 5706-5719, Nov. 2010. https://doi.org/10.1109/TSP.2010.2063426