Erratum: A Combined Doppler Scale Estimation Scheme for Underwater Acoustic OFDM System

Q1 Mathematics

Journal of Computational Acoustics Pub Date : 2015-12-01 DOI:10.1142/S0218396X16920016

Lu Ma, Gang Qiao, Songzuo Liu

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引用次数: 7

Abstract

Since the performance of orthogonal frequency division multiplexing (OFDM) system is severely limited by frequency-dependent Doppler shifts over underwater acoustic (UWA) channels, a combined Doppler scale estimation scheme is proposed, containing two steps: (1) the initial Doppler scale estimation via transmitting two identical short OFDM symbols preceded by a cyclic prefix (CP) as a preamble prior to the data transmission; and (2) fine synchronization and Doppler scale estimation for each CP-OFDM block are achieved by the CP-based method, and eventually the resampling methodology is adopted for nonuniform Doppler shifts compensation. The proposed scheme has been tested with real data from the Songhua Lake experiment where the transmitter is moving at a speed of about 2.5 m/s, and the Yellow sea trial in which the transmitter and receiver are floating freely with waves and currents. Excellent performance results are obtained by block-by-block processing, without buffering the whole packet, which is suitable for real-time receiver processing over time-varying UWA channels.

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一种水声OFDM系统的联合多普勒尺度估计方案

针对正交频分复用(OFDM)系统的性能受到水声(UWA)信道上频率相关的多普勒频移的严重限制，提出了一种组合多普勒尺度估计方案，该方案包含两个步骤:(1)在数据传输之前，通过发送两个相同的短OFDM符号，以循环前缀(CP)作为前导进行初始多普勒尺度估计;(2)利用基于cp的方法实现各CP-OFDM块的精细同步和多普勒尺度估计，最终采用重采样方法进行非均匀多普勒频移补偿。在松花湖试验中，发射机以2.5 m/s的速度移动;在黄海试验中，发射机和接收机随波浪和水流自由漂浮。采用分块处理的方法，无需对整个数据包进行缓冲，可以获得优异的性能，适合时变UWA信道上的实时接收方处理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Computational Acoustics 物理-声学

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

4.5 months

期刊介绍： Currently known as Journal of Theoretical and Computational Acoustics (JTCA).The aim of this journal is to provide an international forum for the dissemination of the state-of-the-art information in the field of Computational Acoustics. Topics covered by this journal include research and tutorial contributions in OCEAN ACOUSTICS (a subject of active research in relation with sonar detection and the design of noiseless ships), SEISMO-ACOUSTICS (of concern to earthquake science and engineering, and also to those doing underground prospection like searching for petroleum), AEROACOUSTICS (which includes the analysis of noise created by aircraft), COMPUTATIONAL METHODS, and SUPERCOMPUTING. In addition to the traditional issues and problems in computational methods, the journal also considers theoretical research acoustics papers which lead to large-scale scientific computations. The journal strives to be flexible in the type of high quality papers it publishes and their format. Equally desirable are Full papers, which should be complete and relatively self-contained original contributions with an introduction that can be understood by the broad computational acoustics community. Both rigorous and heuristic styles are acceptable. Of particular interest are papers about new areas of research in which other than strictly computational arguments may be important in establishing a basis for further developments. Tutorial review papers, covering some of the important issues in Computational Mathematical Methods, Scientific Computing, and their applications. Short notes, which present specific new results and techniques in a brief communication. The journal will occasionally publish significant contributions which are larger than the usual format for regular papers. Special issues which report results of high quality workshops in related areas and monographs of significant contributions in the Series of Computational Acoustics will also be published.