[1] Zhang Yenan, Xu Feiyun, Jia Minping,. A modified time domain interpolation methodfor LS channel estimation in OFDM systems [J]. Journal of Southeast University (English Edition), 2022, 38 (3): 219-226. [doi:10.3969/j.issn.1003-7985.2022.03.002]

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A modified time domain interpolation methodfor LS channel estimation in OFDM systems()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

38

Issue:

2022 3

Page:

219-226

Research Field:

Information and Communication Engineering

Publishing date:

2022-09-20

Info

Title:

A modified time domain interpolation methodfor LS channel estimation in OFDM systems

Author(s):

Zhang Yenan;  Xu Feiyun;  Jia Minping

School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Keywords:

orthogonal frequency division multiplexing(OFDM);  channel estimation;  linear interpolation;  time domain interpolation

PACS:

TN929.5

DOI:

10.3969/j.issn.1003-7985.2022.03.002

Abstract:

A modified time domain interpolation method is proposed for orthogonal frequency division multiplexing(OFDM)systems to address the problem that time domain interpolation in the least square(LS)channel estimation method based on comb-type pilots cannot choose the pilot spacing flexibly. Firstly, the estimated channel frequency response(CFR)at pilot positions in the frequency domain is obtained by LS channel estimation based on comb-type pilots, and the estimated channel impulse response(CIR)in the time domain is obtained by linear interpolation and inverse fast Fourier transform(IFFT). Secondly, the error of the estimated CIR obtained by linear interpolation is analyzed by theoretical deduction, and a method for correcting it is proposed. Finally, an estimated CFR at all subcarrier positions in the frequency domain is obtained by performing zero padding in the time domain and fast Fourier transform(FFT)on the modified CIR. The simulation results suggest that the proposed method gives similar performance to time domain interpolation, yet it does not need to meet the condition of time domain interpolation that the number of subcarriers must be an integral multiple of pilot spacing to use it. The proposed method allows for flexible pilot spacing, reducing the number of pilots and the consumption of subcarriers used for channel estimation.

References:

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Memo

Memo:

Biographies: Zhang Yenan(1998—), male, graduate; Jia Minping(corresponding author), male, doctor, professor, mpjia@ seu. edu. cn.
Foundation item: The National Natural Science Foundation of China(No. 51975117).
Citation: Zhang Yenan, Xu Feiyun, Jia Minping.A modified time domain interpolation method for LS channel estimation in OFDM systems[J].Journal of Southeast University(English Edition), 2022, 38(3):219-226.DOI:10.3969/j.issn.1003-7985.2022.03.002.

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