Iterative decision feedback equalizer with cyclic detection for DFT-S OFDM system

Wang, Yafeng and Yang, Hao and Yang, Dacheng and Xiang, Wei (2010) Iterative decision feedback equalizer with cyclic detection for DFT-S OFDM system. Computers and Electrical Engineering, 36 (4). pp. 789-801. ISSN 0045-7906


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held. Published version cannot be displayed.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering
Date Deposited: 10 Feb 2011 02:57
Last Modified: 10 Oct 2014 05:19
Uncontrolled Keywords: decision feedback equalizers; cyclic detection; DFT-S OFDM; iterative DFE
Fields of Research : 08 Information and Computing Sciences > 0806 Information Systems > 080607 Information Engineering and Theory
08 Information and Computing Sciences > 0805 Distributed Computing > 080501 Distributed and Grid Systems
10 Technology > 1005 Communications Technologies > 100510 Wireless Communications
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970108 Expanding Knowledge in the Information and Computing Sciences
Identification Number or DOI: 10.1016/j.compeleceng.2008.11.002

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