Journal of Korea Society of Digital Industry and Information Management (디지털산업정보학회논문지)

Korea Society of Digital Industry and Information Management (디지털산업정보학회)
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A Novel Channel Estimation using 2-Dimensional Linear Iinterpolation for OFDM MIMO systems

2차원 선형보간법을 이용한 OFDM MIMO 시스템에서의 채널 추정

  • 오태열 (한양대학교 전자통신공학과) ;
  • 안성수 (명지전문대학교 정보통신과) ;
  • 최승원 (한양대학교 융합전자공학부)
  • Received : 2011.08.18
  • Accepted : 2011.09.12
  • Published : 2011.09.30
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Abstract

An OFDMA(Orthogonal Frequency Division Multiple Access) includes a MIMO(Multi-Input Multi-Output) scheme for improving spectral efficiency and data throughput. Recognizing that the performance of MIMO system is heavily dependent upon the accuracy of channel estimation, we propose a novel channel estimation for the MIMO scheme based on OFDMA. Conventional interpolation-based channel estimation suffers from poor estimation error at specific subcarriers. Proposed scheme makes use of a planar interpolation instead of linear interpolation for those subcarriers of bad accuracy. Simulation results show that the proposed scheme improves the performance of MIMO system by improving the accuracy in channel estimation especially for the adverse subcarrier positions. It is observed that the proposed scheme outperforms the conventional method by about 2dB in terms of both mean squared error and overall bit error rate with a reasonable computational complexity.

Keywords

Acknowledgement

Supported by : 지식경제부

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