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Open AccessArticle

A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems

School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai 264209, China
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Appl. Sci. 2018, 8(6), 877; https://doi.org/10.3390/app8060877
Received: 16 April 2018 / Revised: 18 May 2018 / Accepted: 22 May 2018 / Published: 26 May 2018
Channel estimation is a key technology in improving the performance of the orthogonal frequency division multiplexing (OFDM) system. The pilot-based channel estimation method decreases the spectral efficiency and data transmission rate. Some conventional channel estimation methods cannot suppress the noise effectively, which affects the quality of the final received signals. To solve these two problems, a Haar wavelet decision feedback (DF) channel estimation method, also named the Haar wavelet method, is proposed in this paper. The proposed Haar wavelet method can suppress the noise existing at the estimated channel impulse response (CIR) effectively, based on a time-domain threshold which is a standard deviation of noise obtained by wavelet decomposition. At the same time, the proposed Haar wavelet method just requires inserting one block pilot symbol in front of the first OFDM symbol, which therefore improves the data transmission rate and spectrum efficiency greatly. Simulation results are shown to verify the effectiveness of the proposed Haar wavelet method in multipath channel propagation conditions. View Full-Text
Keywords: channel estimation; orthogonal frequency division multiplexing (OFDM); decision feedback (DF); wavelet decomposition channel estimation; orthogonal frequency division multiplexing (OFDM); decision feedback (DF); wavelet decomposition
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Tang, R.; Zhou, X.; Wang, C. A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems. Appl. Sci. 2018, 8, 877.

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