전자공학회논문지 (Journal of the Institute of Electronics and Information Engineers)

  • 제53권3호
  • /
  • Pages.11-20
  • /
  • 2016
  • /
  • 2287-5026(pISSN)
  • /
  • 2288-159X(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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LTE-A 하향링크 시스템을 위한 새로운 FFT 기반 채널 추정 기법

FFT-based Channel Estimation Scheme in LTE-A Downlink System

  • 문상미 (전남대학교 전자컴퓨터공학부) ;
  • 추명훈 (전남대학교 전자컴퓨터공학부) ;
  • 김한종 (한국기술교육대학 정보기술공학부) ;
  • 김대진 (전남대학교 전자컴퓨터공학부) ;
  • 황인태 (전남대학교 전자컴퓨터공학부)
  • Moon, Sangmi (School of Electronics & Computer Engineering Chonnam National University) ;
  • Chu, Myeonghun (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kim, Hanjong (School of Electrical, Electronics & Communication Engineering, Korea University of Technology and Education) ;
  • Kim, Daejin (School of Electronics & Computer Engineering Chonnam National University) ;
  • Hwang, Intae (School of Electronics & Computer Engineering Chonnam National University)
  • 투고 : 2015.09.21
  • 심사 : 2016.03.07
  • 발행 : 2016.03.25
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초록

본 논문에서는 LTE-A (Long Term Evolution-Advanced) 하향링크 시스템을 위한 채널 추정 기법을 제안한다. 제안 기법은 빠른 속도로 움직이는 사용자의 채널 추정이 가능하도록 FFT (Fast Fourier Transform) 보간 기법을 사용한다. FFT 보간 기법은 LS (Least Square) 또는 MMSE (Minimum Mean Square Error) 채널 추정으로부터 얻은 채널 주파수 응답을 IFFT (Inverse FFT)를 거쳐 시간 영역 채널 임펄스 응답으로 변환한다. 시간 영역의 채널 응답을 윈도잉을 한 후, FFT를 하여 채널 주파수 응답을 구할 수 있다. 시스템 레벨 시뮬레이션은 3GPP LTE-A 하향링크 시스템의 20MHz 대역을 기반으로 이루어졌으며, 모의실험 결과 제안한 채널 추정 기법을 통해 기존 시스템보다 SINR (Signal-to-Noise-plus-Interference Ratio), 전송률 및 스펙트럼 효율 측면에서 성능 향상을 가져다주는 것을 확인하였다.

In this paper, we propose the channel estimation scheme for Long Term Evolution-Advanced (LTE-A) downlink system. The proposed scheme uses the fast fourier transform (FFT) interpolation scheme for the user moving at a high speed. The FFT interpolation scheme converts the channel frequency response obtained from least square (LS) or minimum mean square error (MMSE) channel estimation scheme to time domain channel impulse response by taking the inverse FFT (IFFT). After windowing the channel response in the time domain, we can obtain the channel frequency response by taking the FFT. We perform the system level simulation based on 20MHz bandwidth of 3GPP LTE-A downlink system. Simulation results show that the proposed channel estimation scheme can improve signal-to-noise-plus-interference ratio (SINR), throughput, and spectral efficiency of conventional system.

키워드

참고문헌

  1. 3GPP, TS 36.211, "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation," V11.4.0, Sept. 2013.
  2. Saransh Malik, Sherlie Portugal, Sangmi Moon, Bora Kim, Cheol Sung Kim, In Tae Hwang, "Novel Channel Estimation Method in Fast Fading Channels Applied to LTE-Advanced," Journal of The Institute of Electronics and Information Engineers Vol.49, NO.5, May 2012
  3. J. Hou, J. Liu, "A Novel Channel Estimation Algorithm for 3GPP LTE Downlink System Using Joint Time-Frequency Two-Dimentional Iterative Wiener Filter", University of Science and Technology of China.
  4. Hyundong Kim and Sangho Choe, "Channel Prediction and Estimation based Feedback Overhead Reduction for Adaptive OFDM System," The Institute of Electronics and Information Engineers, Summer Conference 2016, June 2006.
  5. Yusuke Ohwatari, Nobuhiko Miki, Takahiro Asai, Tetsushi Abe, and Hidekazu Taoka, "Performance of Advanced Receiver Employing Interference Rejection Combining to Suppress Inter-Cell Interference in LTE-Advanced Downlink," 2011 IEEE VCT, Sept. 2011.
  6. Zakaria Hanzaz, Hans Dieter Schotten, "Analysis of Effective SINR Mapping Models for MIMO OFDM in LTE System," 2013 9th International Wireless Communications and Mobile Computing Conference (IWCMC), 1-5 July 2013
  7. 3GPP TR 36.814, Further advancements for E-UTRA physical layer aspects (Release 9), V9.0.0 (2010-03)