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Link to original content: https://unpaywall.org/10.1587/TRANSFUN.E100.A.2323
Subcarrier-Selectable Short Preamble for OFDM Channel Estimation in Real-Time Wireless Control Systems
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Special Section on Smart Multimedia & Communication Systems
Subcarrier-Selectable Short Preamble for OFDM Channel Estimation in Real-Time Wireless Control Systems
Theerat SAKDEJAYONTChun-Hao LIAOMakoto SUZUKIHiroyuki MORIKAWA
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2017 Volume E100.A Issue 11 Pages 2323-2331

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Abstract

Real-time and reliable radio communication is essential for wireless control systems (WCS). In WCS, preambles create significant overhead and affect the real-time capability since payloads are typically small. To shorten the preamble transmission time in OFDM systems, previous works have considered adopting either time-direction extrapolation (TDE) or frequency-direction interpolation (FDI) for channel estimation which however result in poor performance in fast fading channels and frequency-selective fading channels, respectively. In this work, we propose a subcarrier-selectable short preamble (SSSP) by introducing selectability to subcarrier sampling patterns of a preamble such that it can provide full sampling coverage of all subcarriers with several preamble transmissions. In addition, we introduce adaptability to a channel estimation algorithm for the SSSP so that it conforms to both fast and frequency-selective channels. Simulation results validate the feasibility of the proposed method in terms of the reliability and real-time capability. In particular, the SSSP scheme shows its advantage in flexibility as it can provide a low error rate and short communication time in various channel conditions.

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© 2017 The Institute of Electronics, Information and Communication Engineers
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