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Underwater acoustic channel time delay estimation method based on image deconvolution

An underwater acoustic channel and time delay estimation technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., to achieve efficient channel estimation, avoid wide main lobe problems, and improve performance and computational complexity

Active Publication Date: 2019-12-20
HARBIN ENG UNIV
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Problems solved by technology

[0003] However, due to its low computational complexity, the popular Orthogonal Matching Pursuit (OMP) channel estimation based on compressed sensing has an unavoidable inherent disadvantage: when calculating the inner product function, there is a problem of large main lobe width similar to traditional beamforming

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  • Underwater acoustic channel time delay estimation method based on image deconvolution
  • Underwater acoustic channel time delay estimation method based on image deconvolution
  • Underwater acoustic channel time delay estimation method based on image deconvolution

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Embodiment Construction

[0035] The following examples describe the present invention in more detail.

[0036] A. CP-OFDM system

[0037] The OFDM system involved in the present invention adopts a cyclic prefix mode. Suppose an OFDM symbol block contains K subcarriers, the transmitted symbol on each subcarrier is s(k), and the number of pilot subcarriers is N p , the pilot interval is D. The duration of an OFDM symbol block is T, and the duration of the cyclic prefix is ​​T cp , the carrier frequency is f c .

[0038] Assuming that the channel remains unchanged for two symbol durations, the channel model in this paper is a multipath channel with L paths, and the amplitude and delay of each path are A p and τ p (p=1,2,…,L), and assume that the residual Doppler offset of the channel after Doppler compensation is f d . The signal at the receiving end is sent to the FFT demodulator after being sampled and removed from the cyclic prefix (assuming that the length of the cyclic prefix is ​​greater th...

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Abstract

The invention provides an underwater acoustic channel time delay estimation method based on image deconvolution. The method includes: performing pilot compensation and fast inverse Fourier transform on the OFDM frequency domain observation signal at a system receiving end to obtain a time domain channel response; taking the time domain channel response as an iteration result of previous iteration,and inputting the iteration result into an accelerated iteration module based on a vector extrapolation method to obtain an accelerated prediction result; inputting the prediction result into a Richardson-Lucy deconvolution module based on fast Fourier transform to obtain an iteration result of current iteration; and sending a final iteration result to a post-processing threshold module to screenout a final channel time delay estimation result according to a preset iteration frequency, and solving a frequency domain form of a channel path amplitude and a channel function by utilizing a polynomial basis expansion model. According to the method, the time delay estimation precision of the underwater acoustic OFDM channel is remarkably improved, the time delay estimation performance is excellent in the presence of Doppler frequency shift, and the method can be used for realizing efficient and high-precision underwater acoustic channel estimation.

Description

technical field [0001] The invention relates to a method for estimating time delay of an underwater acoustic channel. Background technique [0002] In recent years, due to the high bandwidth utilization and low complexity of Orthogonal Frequency Division Multiplexing (OFDM) technology, it has been widely used in underwater acoustic communication systems. In practical applications, most underwater acoustic OFDM systems use coherent receivers. The accuracy of channel estimation, especially the accuracy of channel delay estimation, becomes very important. [0003] However, due to its low computational complexity, the popular Orthogonal Matching Pursuit (OMP) channel estimation based on compressed sensing has an unavoidable inherent disadvantage: when calculating the inner product function, there is a problem of large main lobe width similar to traditional beamforming. The good news is that the image deconvolution technique (DCV), which is currently being applied to the directi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2695
Inventor 乔钢强夕竹
Owner HARBIN ENG UNIV
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