Iterative decision feedback equalizer with cyclic detection for DFT-S OFDM system
Article
Article Title | Iterative decision feedback equalizer with cyclic detection for DFT-S OFDM system |
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ERA Journal ID | 4403 |
Article Category | Article |
Authors | Wang, Yafeng (Author), Yang, Hao (Author), Yang, Dacheng (Author) and Xiang, Wei (Author) |
Journal Title | Computers and Electrical Engineering |
Journal Citation | 36 (4), pp. 789-801 |
Number of Pages | 13 |
Year | 2010 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0045-7906 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compeleceng.2008.11.002 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0045790608001262 |
Abstract | One of the most challenging problems in high data rate wireless transmission is to reduce inter-symbol interference (ISI) resulted from the time dispersion caused by multi-path propagation. To solve this problem, equalization is introduced. Generally, efficient decision feedback equalizer (DFE) holds better performance than linear equalizer for the cancellation of ISI without noise enhancement. However, its inherent error propagation has some limitation for further improvement. In fact, as shown later in simulation results, conventional frequency domain DFE (FD-DFE) almost cannot be used in Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplex (DFT-S OFDM) system in Evolved-UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access (E-UTRA) uplink transmission [1]. Unique word (UW) is proposed in the literatures, as a known symbol sequence, can make error propagation beyond one FFT-block impossible since the last symbols of every block are always decided correctly. But the UW-based scheme is not appropriate for DFT-S OFDM, so it must be modified. This paper proposes a simple DFE-based equalization algorithm for DFT-S OFDM. Through cyclic detection and iteration, the new algorithm obtains a noticeable gain than conventional DFE, and is almost as effective as the modified UW-based methods but with much higher bandwidth efficiency. Furthermore, it does not need to change the frame structure of existing protocol. |
Keywords | decision feedback equalizers; cyclic detection; DFT-S OFDM; iterative DFE |
ANZSRC Field of Research 2020 | 460912. Knowledge and information management |
460605. Distributed systems and algorithms | |
400608. Wireless communication systems and technologies (incl. microwave and millimetrewave) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Beijing University of Posts and Telecommunications, China |
Department of Electrical, Electronic and Computer Engineering | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q075z/iterative-decision-feedback-equalizer-with-cyclic-detection-for-dft-s-ofdm-system
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