A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems
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 th...
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doaj-bd399bf53f3e4911bec96d17bb65c1932020-11-24T21:14:28ZengMDPI AGApplied Sciences2076-34172018-05-018687710.3390/app8060877app8060877A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM SystemsRuiguang Tang0Xiao Zhou1Chengyou Wang2School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai 264209, ChinaSchool of Mechanical, Electrical and Information Engineering, Shandong University, Weihai 264209, ChinaSchool of Mechanical, Electrical and Information Engineering, Shandong University, Weihai 264209, ChinaChannel 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.http://www.mdpi.com/2076-3417/8/6/877channel estimationorthogonal frequency division multiplexing (OFDM)decision feedback (DF)wavelet decomposition |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ruiguang Tang Xiao Zhou Chengyou Wang |
spellingShingle |
Ruiguang Tang Xiao Zhou Chengyou Wang A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems Applied Sciences channel estimation orthogonal frequency division multiplexing (OFDM) decision feedback (DF) wavelet decomposition |
author_facet |
Ruiguang Tang Xiao Zhou Chengyou Wang |
author_sort |
Ruiguang Tang |
title |
A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems |
title_short |
A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems |
title_full |
A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems |
title_fullStr |
A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems |
title_full_unstemmed |
A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems |
title_sort |
haar wavelet decision feedback channel estimation method in ofdm systems |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2018-05-01 |
description |
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. |
topic |
channel estimation orthogonal frequency division multiplexing (OFDM) decision feedback (DF) wavelet decomposition |
url |
http://www.mdpi.com/2076-3417/8/6/877 |
work_keys_str_mv |
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_version_ |
1716747043887644672 |