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Fine Doppler scale estimations for an underwater acoustic CP-OFDM system

机译：水下声学CP-OFDM系统的精细多普勒比例估计

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摘要

In the challenging underwater acoustic (UWA) communication channels.the performance of orthogonal frequency division multiplexing (OFDM) systems is severely affected by the Doppler effect.Hence.the Doppler scale estimation and compensation are critical for UWA OFDM systems.As a commonly adopted solution.the Doppler scale can be estimated by the maximization of auto-correlation between the received cyclic prefix (CP) and OFDM symbol.However.the accuracy of the auto-correlation based Doppler scale estimation is decided by the sampling rate of the signal.To achieve higher estimation accuracy.higher sampling rate is required and which means more computational complexity.To overcome this problem.we propose several fine Doppler scale estimation methods by interpolating the auto-correlation peak values.based on the derived expression of the expected auto-correlation outputs corresponding to a CP-OFDM signal after the UWA channel.Simulation results demonstrate the effectiveness of the proposed methods.and the decoding of experimental data further verifies the superiority of those methods.
机译：在具有挑战性的水下声（UWA）通信信道中，正交频分复用（OFDM）系统的性能受到多普勒效应的严重影响，因此，多普勒比例估计和补偿对于UWA OFDM系统至关重要。可以通过使接收到的循环前缀（CP）和OFDM符号之间的自相关最大化来估计多普勒比例，但是基于自相关的多普勒比例估计的精度取决于信号的采样率。为了达到更高的估计精度，需要更高的采样率，这意味着更多的计算复杂性。为解决这个问题，我们基于期望的自相关的导出表达式，通过内插自相关峰值，提出了几种精细的多普勒尺度估计方法。仿真结果证明了该方法的有效性。方法和实验数据的解码进一步验证了这些方法的优越性。

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  • 来源
    《Signal processing》 |2020年第5期|8.1-8.9|共9页
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    Acoustic Science and Technology Laboratory Harbin Engineering University Harbin 150001 China Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University) Ministry of Industry and Information Technology Harbin 150001 China College of Underwater Acoustic Engineering Harbin Engineering University Harbin 150001 China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology (Xiamen University) Ministry of Education Xiamen 361005 China School of Informatics Xiamen University Xiamen 361005 China;

    Acoustic Science and Technology Laboratory Harbin Engineering University Harbin 150001 China Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University) Ministry of Industry and Information Technology Harbin 150001 China College of Underwater Acoustic Engineering Harbin Engineering University Harbin 150001 China;

    Unicore Communications Fremont CA 94538 USA;

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  • 正文语种 eng
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  • 关键词

    Underwater acoustic (UWA) communication; Doppler scale estimation; Orthogonal frequency division multiplexing(OFDM); Cyclic prefix (CP);

    机译：水下声学（UWA）通信;多普勒尺度估计;正交频分复用（OFDM）;循环前缀（CP）;

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