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

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

DOI QR Code

Linear Precoding Based on the Imperfect CSI Without Knowing the CSI Reliability

신뢰도를 모르는 불완전한 채널 정보에 기초한 선형 프리코딩

  • Lee, Woong (Konkuk University Department of Electronics Engineering) ;
  • Yoon, Eunchul (Konkuk University Department of Electronics Engineering)
  • Received : 2015.08.27
  • Accepted : 2015.09.11
  • Published : 2015.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

We propose a linear precoding scheme combining the merits of beamforming and orthogonal space-time block coding based on the imperfect CSI without knowing the CSI reliability. We first investigate the impact of the CSI reliability on precoding performance by assuming various values of the CSI reliability. Then, we propose a method of predicting the CSI reliability based on the received SNR for the design of an efficient precoder. We show the efficiency of the proposed scheme by simulation.

본 논문에서는 신뢰도를 모르는 불완전한 채널 정보를 이용해 빔포밍 기법의 장점과 직교 시공간 블록 코딩 (Orthogonal Space-Time Block Coding, OSTBC) 기법의 장점을 결합해 주는 선형 프리코딩 기법을 제안한다. 먼저 다양한 값의 채널 정보의 신뢰도를 가정한 상태에서 각 신뢰도가 프리코딩 성능에 미치는 영향을 분석한다. 그 뒤, 효율적인 프리코더의 설계를 위하여 수신 SNR을 바탕으로 필요한 채널 정보의 신뢰도를 예측하는 방법을 제안한다. 시뮬레이션을 통해 제안된 프리코더 설계 기법의 효율성을 확인한다.

Keywords

References

  1. Air interface for fixed broadband wireless access systems, IEEE Standard 802.16eTM, 2005.
  2. H. S. Kim, S. H. Lee, and Y. H. Lee, "Channel sounding for cooperative transmit beamforming in OFDM based cellular systems," in Proc. KICS, pp. 1491-1492, Jeju Island, Korea, Jun. 2010.
  3. Y. W. Kim, N. H. Kim, and E. C. Yoon, "Pilot assisted channel frequency response estimation for an OFDM system with a comb-type pilot pattern," J. KICS, vol. 39, no. 6, pp. 333-342, Jun. 2014.
  4. K. J. Kim, K. J. Choi, and K. S. Kim, "DFT-based channel estimation scheme for the uplink of LTE-A systems," J. KICS, vol. 40, no. 2, pp. 307-309, Feb. 2015. https://doi.org/10.7840/kics.2015.40.2.307
  5. S. J. Jang, H. B. Kong, and I. K. Lee, "Pilot assignment algorithm for uplink massive MIMO systems," J. KICS, vol. 40 no. 8, pp. 1485-1491, Aug. 2015.
  6. G. Jongren, M. Skoglund, and B. Ottersten, "Combining beamforming and orthogonal space-time block coding," IEEE Trans. Inf. Theory, vol. 48, no. 3, pp. 611-627, Mar. 2002. https://doi.org/10.1109/18.985950
  7. A. J. Paulraj and D. Gore, Introduction to sapce-time wireless communications, Cambridge Univ. Press, 2003.
  8. V. Tarokh, H. Jafarkhani, and A. R. Calderbank, "Spacetime block codes from orthogonal designes," IEEE Trans. Inf. Theory, vol. 45, no. 2, pp. 1456-1467, Jul. 1999. https://doi.org/10.1109/18.771146
  9. S. Boyd and L. Vandenberghe, Convex Optimization. Cambridge, U.K.: Cambridge Univ. Press, 2004.
  10. P. A. Dighe, R. K. Mallik, and S. S. Jamular, "Analysis of transmit-receive diversity in rayleigh fading," IEEE Trans. Commun., vol. 51, no. 4, pp. 694-703, Apr. 2003. https://doi.org/10.1109/TCOMM.2003.810871
  11. Guideline for Evaluation of Radio Transmission Technologies for IMT-2000, Recomm. ITU-R M.1225, 1997.
  12. M. Morelli and U. Mengali, "A comparison pilot-aided channel estimation methods for ofdm systems," IEEE Trans. Signal Process., vol. 49, no. 12, pp. 3065-3073, Dec. 2001. https://doi.org/10.1109/78.969514