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

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

LTE-Advanced에 적용되는 빠른 페이딩 채널의 새로운 채널 추정 방법

Novel Channel Estimation Method in Fast Fading Channels Applied to LTE-Advanced

  • Malik, Saransh (School of Electronics & Computer Engineering Chonnam National University) ;
  • Portugal, Sherlie (School of Electronics & Computer Engineering Chonnam National University) ;
  • Moon, Sang-Mi (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kim, Bo-Ra (School of Electronics & Computer Engineering Chonnam National University) ;
  • Kim, Cheol-Sung (School of Electronics & Computer Engineering Chonnam National University) ;
  • Hwang, In-Tae (School of Electronics & Computer Engineering Chonnam National University)
  • 투고 : 2011.07.27
  • 심사 : 2012.05.12
  • 발행 : 2012.05.25
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초록

높은 도플러 확산에 의한 채널 통계의 정확한 전송 및 추정은 최근 및 미래의 이동 통신 시스템에서 고려되는 주요 문제중 하나이다. 따라서 기존 채널 추정 기법의 한계를 극복하는 새로운 채널 추정 기술을 연구하는 것이 중요하다. 본 논문에서는 첫 번째 OFDM symbol의 간단한 추정 후 새로운 채널 추정 방법인 파일럿 부반송파와 OFDM symbol의 나머지 채널을 추정하기 위해서 Kalman Filter를 사용하는 것을 제안한다. 또한 지금까지의 대부분 연구에서는 block-type이나 comb-type 파일럿 배열에 초점 맞춰져 있는 것과 달리 LTE-Advanced의 파일럿 부반송파의 lattice-type 배열을 고려하여 설계한다. 이 외에도 결과를 최적화하기 위해서 나머지 부반송파에 대한 채널 주파수 응답을 추정하기 위해 채널 임펄스 응답의 필터링과 Winer Filter를 사용한다.

Accurate transmission and estimation of the channel statistics affected by high Doppler spread is one of the main issues of concern for the latest and future mobile communication systems. Therefore, it is important to research in novel channel estimation techniques that overcome the limitations of conventional methods. In this paper, we propose a novel channel estimation method that, after a simple estimation in the first OFDM symbol, uses Kalman filter to predict the channel in the rest of OFDM symbols with pilot subcarriers. Our method is designed considering the lattice-type arrangement of pilot subcarriers in LTE-Advanced, since most of the studies so far focus on block-type or comb-type pilot arrangements. In addition, to optimize the results, we use the filtering of channel impulse response and Wiener Filter for the estimation of the channel frequency response in the rest of the subcarriers.

키워드

참고문헌

  1. 3GPP TS 36.211: "E-UTRA; Physical Channels and Modulations", v9.1.0, March 2010.
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  3. M. Simko, "Channel Estimation for UMTS Long Term Evolution", Master Thesis, Vienna University of Technology, Austria, June 2009.
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