• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Oceans (Conference) >A Pilot-Aided Doppler Estimator for Underwater Acoustic Channels
【24h】

A Pilot-Aided Doppler Estimator for Underwater Acoustic Channels

机译：用于水下声道的试验辅助多普勒估算器

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The paper presents a practical Doppler estimator to be used in underwater acoustic (UWA) channels. The estimation is performed using OFDM pilot signals. The OFDM pilot signals are passed through a Doppler channel that adds the above effects to the signal. The receiver then performs Doppler estimation on the signal. The estimator finds an estimate for the Doppler scaling factor (also called the mach number) using the centroid of the energy spectral density (ESD) of the received signal. A suitable domain ("window of estimation") for each pilot is chosen to avoid pilot ambiguity resulting from large Doppler shifts. This leads to a necessary condition for the estimator's accuracy that must be satisfied by the designer. After estimating the mach number, Doppler compensation is performed in a two-step process. First the received signal is resampled using the mach number estimate to undo the signal dilation/compression. The second step is to compensate for the residual Doppler shift that persists by back-shifting the frequency spectrum of the pilots. Due to the high accuracy of the estimator, the pilot positions are recovered exactly. A Simulink model that uses the proposed estimator and compensator is presented, and the results show how the estimator performs in a typical underwater channel.
机译：本文介绍了一种用于水下声学（UWA）通道的实用多普勒估计器。使用OFDM导频信号执行估计。 OFDM导频信号通过多普勒通道传递，该频道将上述效果添加到信号。然后，接收器对信号执行多普勒估计。使用所接收信号的能谱密度（ESD）的质心来查找多普勒缩放因子（也称为马赫数）的估计。选择每个导频的合适域（“估计窗口”），以避免由大多普勒偏移产生的导频模糊。这导致估算者必须由设计者满足的准确性的必要条件。在估计Mach数之后，在两步过程中执行多普勒补偿。首先，使用Mach编号估计来重新采样接收信号以撤消信号扩张/压缩。第二步是通过回到飞行员的频谱来补偿持续的残余多普勒频移。由于估计器的高精度，预先恢复了导频位置。提出了一种使用所提出的估计器和补偿器的Simulink模型，结果显示了估计器如何在典型的水下信道中执行。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号