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计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

OFDM水声通信多普勒频移采样率转换算法

郭铁梁1,2,赵旦峰1,钱晋希1   

  1. (1. 哈尔滨工程大学信息与通信工程学院,哈尔滨 150001;2. 黑龙江科技学院理学院,哈尔滨 150027)
  • 收稿日期:2013-01-30 出版日期:2014-03-15 发布日期:2014-03-13
  • 作者简介:郭铁梁(1971-),男,副教授、博士研究生,主研方向:水声通信技术;赵旦峰,教授、博士生导师;钱晋希,博士研究生。
  • 基金资助:
    黑龙江省自然科学基金资助项目(F200810)。

Algorithm of Doppler Shift Sample Rate Conversion in OFDM Underwater Acoustic Communication

GUO Tie-liang  1,2, ZHAO Dan-feng  1, QIAN Jin-xi  1   

  1. (1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China; 2. College of Science, Heilongjiang Institute of Science and Technology, Harbin 150027, China)
  • Received:2013-01-30 Online:2014-03-15 Published:2014-03-13

摘要: 对于OFDM水声通信系统,传统的基于数据辅助多普勒频移因子估计算法会降低系统的信息传输速率,对接收信号进行采样率转换通常采用重采样的方法,计算量较大。针对上述问题,提出基于过采样技术的多普勒频移因子估计算法及采样率转换算法,通过采用对系统发射信号与接收信号采样点数进行比较的方法,得到多普勒频移因子的估值。在此基础上,利用上述过采样数据和线性插值算法对接收信号进行采样率的转换。理论分析和仿真结果表明,改进算法在保证系统性能的同时,可以大幅减小接收机的计算量,适用于高速实时水声通信系统。

关键词: 水声通信, 正交频分复用, 多普勒频移, 过采样, 线性插值, 采样率转换

Abstract: To the Orthogonal Frequency Division Multiplexing(OFDM) Underwater Acoustic(UWA) communication systems, the traditional estimation algorithm based on data aided for Doppler Shift Factor(DSF) can reduce the system transmission rate. In addition, resampling algorithm is often used for the sample rate conversion in the receiving end, but there is a problem of large calculation in the process. Therefore, a novel algorithm about DSF estimation and sample rate conversion are proposed based on oversampling technique. The DSF can be estimated by comparing the sampling points with the transmitting and receiving signals. And the linear interpolation algorithm is adopted to finish the sample rate conversion. Theroy analysis and simulation results show that the algorithm not only can guarantee the system performance but also can reduce the receiver calculation amount. So it is applicable to the high-speed real-time UWA com- munication systems.

Key words: Underwater Acoustic(UWA) communication, Orthogonal Frequency Division Multiplexing(OFDM), Doppler Shift(DS), oversampling, linear interpolation, sample rate conversion

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