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Enhanced channel estimation in OFDM systems with neural network technologies

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Abstract

Orthogonal frequency division multiplexing (OFDM) provides an effective and low complexity means of eliminating inter-symbol interference for transmission over frequency selective fading channels. In OFDM systems, channel state information (CSI) is required for the OFDM receiver to perform coherent detection or diversity combining, if multiple transmit and receive antennas are deployed. In practice, CSI can be reliably estimated at the receiver by transmitting pilots along with data symbols. In this paper, we investigate and compare various efficient pilot-based channel estimation schemes by neural network technologies for OFDM systems. We present further the application of functional link neural fuzzy network (FLNFN) for channel estimation in the investigated OFDM systems. We compared bit error rates of the proposed neural network with that of the other neural network technologies, the least square (LS) algorithm, and the minimum mean square error (MMSE) algorithm. Our results demonstrate that the proposed FLNFN algorithm can enhance the performance of channel estimation in existing OFDM channel environments.

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Acknowledgements

This work was partially supported by the Ministry of Science and Technology (MOST), Taiwan, Republic of China, under Grant MOST 106-2632-E-468-003, and Asia University, Taiwan, and China Medical University Hospital, China Medical University, Taiwan (Grant No. ASIA-106-CMUH-04).

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Authors and Affiliations

  1. Department of Electrical Engineering, National Formosa University, 64, Wunhua Rd., Huwei, Yunlin, 63201, Taiwan

    Chia-Hsin Cheng & Yao-Hung Huang

  2. Department of Computer Science and Information Engineering, Asia University, 500, Lioufeng Rd., Wufeng, Taichung, 41354, Taiwan

    Hsing-Chung Chen

  3. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan

    Hsing-Chung Chen

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  1. Chia-Hsin Cheng
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  2. Yao-Hung Huang
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  3. Hsing-Chung Chen
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Correspondence to Hsing-Chung Chen.

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Cheng, CH., Huang, YH. & Chen, HC. Enhanced channel estimation in OFDM systems with neural network technologies. Soft Comput 23, 5185–5197 (2019). https://doi.org/10.1007/s00500-018-3185-y

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