대한전자공학회논문지TC (Journal of the Institute of Electronics Engineers of Korea TC)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

LTE 하향 링크 시스템에서 양자화된 동 이득 전송 기법의 개선된 코드북 인덱스 탐색 기법

Enhanced Codebook Index Search Scheme for Quantized Equal Gain Transmission over LTE Down Link Systems

  • 박노윤 (충북대학교 정보통신공학과) ;
  • 이신 (충북대학교 정보통신공학과) ;
  • 김영주 (충북대학교 정보통신공학과)
  • Park, Noe-Yoon (School of Information and Communication Engineering, Chungbuk National University) ;
  • Li, Xun (School of Information and Communication Engineering, Chungbuk National University) ;
  • Kim, Young-Ju (School of Information and Communication Engineering, Chungbuk National University)
  • 투고 : 2010.10.21
  • 심사 : 2011.01.14
  • 발행 : 2011.01.25
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

LTE 하향링크 시스템에서 새로운 동 이득 전송 코드북 인덱스 탐색기법을 제안한다. 제안하는 탐색기법은 QEGT 코드북을 Q 개의 인덱스들로 구성된 M 개의 그룹으로 분할한 후, 선택된 최적의 그룹 내 인덱스들 중에서 최적의 인덱스를 결정하는 것으로 기존 탐색기법에 비해 인덱스 결정을 위한 전체 계산량이 감소하면서 링크레벨 성능은 유지가 되는 장점이 있다. TI사(社)의 TMS320C6713 DSP보드를 이용한 인덱스 탐색 알고리즘의 구현을 통해 송신 안테나 수가 4인 경우 최적의 피드백 인덱스 결정을 위한 전체 clock-cycle 수가 기존보다 약 25%로 감소됨을 확인한다.

A novel QEGT codebook index searching algorithm for long tenn evolution (LTE) system is proposed. The proposed algorithm divides the Q precoding vectors into M groups, and selects the optimal precoding vector from the selected group at the receiver. This algorithm reduced the calculation for searching the optimal precoding vector index compared to the previous algorithms. The index searching algorithm is implemented for TI's TMS320C6713 DSP board. When the number of transmit antenna is 4, the number of clock cycles is reduced to 25%.

키워드

참고문헌

  1. 3rd Generation Partnership Project, http://www/3gpp/org
  2. 3rd Generation Partnership Project, 3GPP TS 36.211 - Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8), Dec. 2008.
  3. 3rd Generation Partnership Project, 3GPP TR 25.913 - Technical Specification Group Radio Access Network; Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) (Release 8), Dec. 2008.
  4. D. J. Love and R. W. Heath, "Equal Gain Transmission in Multiple-Input Multiple-output Wireless Systems," IEEE Trans. Commun., vol. 51, no. 7, pp. 1102-1110, July 2003. https://doi.org/10.1109/TCOMM.2003.814195
  5. D. G. Brennan, "Linear diversity combining techniques," Proc. IRE, vol. 47, pp. 1075-1102, June 1959.
  6. M. A. Najib and V. K. Prabhu, "Analysis of equal-gain diversity with partially coherent fading signals," IEEE Trans. Veh. Technol., vol. 49, pp. 783-791, May 2000.
  7. A. Annamalai, C. Tellambura, and V. K. Bhargava, "Equal-gain diversity receiver performance in wireless channels," IEEE Trans. Commun., vol. 48, pp. 1732-1745, Oct. 2000. https://doi.org/10.1109/26.871398
  8. Q. T. Zhang, "Probability of error for equal-gain combiners over Rayleigh channels: Some closed-form solutions," IEEE Trans. Commun., vol. 45, pp. 270-273, Mar. 1997. https://doi.org/10.1109/26.558680
  9. Q. T. Zhang, "A simple approach to probability of error for equal gain combiners over Rayleigh channels," IEEE Trans. Veh. Technol., vol. 48, pp. 1151-1154, July 1999. https://doi.org/10.1109/25.775364
  10. Xun Li, Y. J. Kim, "Performance analysis of equal gain transmission technique for SC-FDMA system," The Institute of Electronics Engineers of Korea, vol. 46, no. 9, Sep. 2009.
  11. N. Y. Park, Xun Li, K. S. Lee, and Y. J. Kim, "A fast index search algorithm for codebookbased equal gain transmission beamforming system," The Institute of Electronics Engineers of Korea, vol. 45, no. 12, Dec. 2008.
  12. D. J. Love and R. W. Heath, "Limited Feedback Unitary Precoding for Orthogonal Space-time Block Codes," IEEE Trans. Signal. Proc., vol. 53, no. 1, pp. 64-73, Jan 2005. https://doi.org/10.1109/TSP.2004.838928
  13. D. J. Love, R. W. Heath, Jr., V. K. N. Lau, D. Gesbert, B. D. Rao, and M. Andrews, "An overview of limited feedback in wireless communication systems," IEEE J. Select. Areas Commun., vol. 26, no. 8, pp. 1341-1365, Oct. 2008. https://doi.org/10.1109/JSAC.2008.081002
  14. Recommendation ITU-R M.1225, Guidelines for Evaluation of Radio Transmission Technologies for IMT-2000, 1997.