한국군사과학기술학회지 (Journal of the Korea Institute of Military Science and Technology)

  • 제24권6호
  • /
  • Pages.655-663
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  • 2021
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  • 1598-9127(pISSN)
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  • 2636-0640(eISSN)
한국군사과학기술학회 (The Korea Institute of Military Science and Technology)
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MIMO OFDM 시스템을 위한 채널 응답 미러링을 이용한 DFT기반 채널 추정 기법

DFT-Based Channel Estimation with Channel Response Mirroring for MIMO OFDM Systems

  • 투고 : 2021.06.09
  • 심사 : 2021.09.17
  • 발행 : 2021.12.05
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초록

In this paper, DFT-Based channel estimation with channel response mirroring is proposed and analyzed. In General, pilot symbols for channel estimation in MIMO(Multi-Input Multi-Output) OFDM(Orthogonal Frequency-Division Multiplexing) Systems have a diamond shape in the time-frequency plane. An interpolation technique to estimate the channel response of sub-carriers between reference symbols is needed. Various interpolation techniques such as linear interpolation, low-pass filtering interpolation, cubic interpolation and DFT interpolation are employed to estimate the non-pilot sub-carriers. In this paper, we investigate the conventional DFT-based channel estimation for noise reduction and channel response interpolation. The conventional method has performance degradation by distortion called "edge effect" or "border effect". In order to mitigate the distortion, we propose an improved DFT-based channel estimation with channel response mirroring. This technique can efficiently mitigate the distortion caused by the DFT of channel response discontinuity. Simulation results show that the proposed method has better performance than the conventional DFT-based channel estimation in terms of MSE.

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참고문헌

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