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Methods to Estimate the Channel Delay Profile and Doppler Spectrum of Shallow Underwater Acoustic Channels

机译：浅水声信道估计信道时延剖面和多普勒频谱的方法

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In this paper, we present the methods to detect the channel delay profile and the Doppler spectrum of shallow underwater acoustic channels (SUAC). In our channel sounding methods, a short impulse in form of a sinusoid function is successively sent out from the transmitter to estimated the channel impulse response (CIR). A bandpass filter is applied to eliminate the interference from out-of-band (OOB). A threshould is utilized to obtain the maximum time delay of the CIR. Multipath components of the SUAC are specified by correlating the received signals with the transmitted sounding pulse with its shifted phases from 0 to 2π. We show the measured channel parameters, which have been carried out in some lakes in Hanoi. The measured results illustrate that the channel is frequency selective for a narrow band transmission. The Doppler spectrum can be obtained by taking the Fourier transform of the time correlation of the measured channel transfer function. We have shown that, the theoretical maximum Doppler frequency fits well to that one obtained from measurement results.
机译：在本文中，我们提出了用于检测浅水声波信道（SUAC）的信道延迟分布和多普勒频谱的方法。在我们的信道探测方法中，正弦函数形式的短脉冲从发射机连续发出，以估计信道脉冲响应（CIR）。应用带通滤波器可消除带外（OOB）的干扰。应该使用阈值来获得CIR的最大时间延迟。 SUAC的多径分量是通过将接收到的信号与发送的探测脉冲（从0到2π的相移）相关联来指定的。我们显示了已测量的河道参数，这些参数已在河内的一些湖泊中进行。测量结果表明，该信道对于窄带传输是频率选择性的。多普勒频谱可以通过对所测量的信道传递函数的时间相关性进行傅立叶变换来获得。我们已经表明，理论上最大的多普勒频率与从测量结果中获得的频率非常吻合。

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