Blind symbol timing synchronization scheme for real-time industrial wireless control network using high-speed preambleless OFDM systems over multipath fading channels |
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| Affiliation: | 1. Department of Electrical and Electronic Engineering, Graduate School of Engineering, Chiba University, 1-33 Yayoi, Inage, Chiba, 263-0022, Japan;2. Nokia, Alcatel-Lucent Shanghai Bell, China;1. Département d''Electronique, Université Mouloud Mammeri, Tizi-Ouzou, Algeria;2. Département de Mathématiques, Université Mouloud Mammeri, Tizi-Ouzou, Algeria;3. Laboratoire MIPS, Université de Haute Alsace, France;1. Department of Electronics and Computer Technology, Campus Universitario Fuentenueva, University of Granada, 18071 Granada, Spain;2. Department of Computer Architecture and Automation, Complutense University of Madrid, 28040 Madrid, Spain;1. Department of Bioengineering and Robotics, Tohoku University 6-6-01 Aramaki aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan;2. Yokohama City University, Japan 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan;1. Yokogawa Electric Corporation, 2-9-32 Naka-Cho, Musashino-shi, Tokyo, Japan;2. EnNet Co., Ltd., Lab. 305, Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10 Aomi, Koto-ku, Tokyo, Japan;1. Mannheimer Zentrum für Europäische Sozialforschung (MZES), Universität Mannheim, A5, 6 Bauteil A, 68131 Mannheim, Germany;2. Département de science politique et relations internationales, Université de Genève, 40, bd du Pont d''Arve, 1211 Genève, Switzerland |
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| Abstract: | An accurate estimation of symbol timing is crucial for orthogonal frequency division multiplexing (OFDM) demodulation, since synchronization errors might destroy the orthogonality among all subcarriers and have greater impact on the system performance than single carrier systems. The symbol timing offset (STO) that leads to inter-symbol interference (ISI) and inter-channel interference (ICI) must be avoided as much as possible. In this paper, a novel symbol timing synchronization algorithm is proposed for OFDM systems on the basis of cyclic prefix (CP). A metric function and a positioning function have been designed by taking advantage of the correlation properties of OFDM signals. Computer simulations demonstrate that the schemes are superior because they achieve accurate timing offset estimation with smaller standard deviation (SD) and relatively lower computational complexity compared with the existing methods based on CP under high signal–noise ratio (SNR) assumption over frequency-selective channels, which can meet the real-time requirements in wireless local area network (WLAN) environments for factory automation (FA). |
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| Keywords: | Frequency-selective channels Frequency-division multiplexing Symbol timing synchronization Symbol timing offset |
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