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A Fast Channel Estimation and Signal Synchronization Method Applicable to Underwater Acoustic Modem

A channel estimation and signal synchronization technology, which is applied in transmission systems, electrical components, multi-frequency code systems, etc., can solve problems such as high computational complexity and cannot meet the needs of real-time underwater acoustic communication systems, and achieve the effect of improving estimation accuracy

Active Publication Date: 2020-07-10
ZHEJIANG UNIV
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Problems solved by technology

But unlike wireless channels with Rayleigh fading characteristics and shorter channel impulse response
The underwater acoustic channel has long delay characteristics, and the computational complexity of solving the inverse problem is very high, which cannot meet the needs of real-time underwater acoustic communication systems

Method used

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  • A Fast Channel Estimation and Signal Synchronization Method Applicable to Underwater Acoustic Modem
  • A Fast Channel Estimation and Signal Synchronization Method Applicable to Underwater Acoustic Modem
  • A Fast Channel Estimation and Signal Synchronization Method Applicable to Underwater Acoustic Modem

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Embodiment Construction

[0067] The present invention will be described in detail below in conjunction with the accompanying drawings, but the implementation and protection scope of the present invention are not limited thereto.

[0068] Such as figure 1 As shown, a fast underwater acoustic channel estimation and signal synchronization method is supplemented as follows:

[0069] step 1:

[0070] Step 1.1: adopt two groups of identical pseudo-random sequences as the pilot symbols of the physical layer data link block, and send the information symbol sequence as formula (1):

[0071]

[0072] Step 1.2: Use the pseudo-random sequence to have cyclic shift characteristics, and its properties can be expressed as formula (2):

[0073]

[0074] In formula (2), M represents the order of the pseudo-random sequence, m represents the subscript of the element in the pseudo-random sequence, and also represents the signal delay. T is a matrix operator with cyclic shift properties, which can be expressed as ...

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Abstract

The invention discloses a rapid channel estimation and signal synchronization method suitable for an underwater acoustic modem, and is suitable for the field of real-time online demodulation of the underwater acoustic modem. The underwater acoustic communication modem physical layer data link block pilot signal is designed, the rapid Fourier transform and the subspace projection are utilized to realize the rapid estimation and online decoding process of an underwater acoustic channel, and meanwhile, the periodic autocorrelation characteristic of a pseudorandom sequence is utilized to realize the rapid decorrelation process and realize the physical layer signal synchronization. Compared with a general time domain underwater acoustic channel estimation and signal synchronization method, thealgorithm has the advantages that the algorithm can be rapidly realized by using systems such as a digital signal processor (DSP), a field programmable gate array (FPGA) and the like, and the operation complexity is reduced while the channel estimation is ensured. The method is especially suitable for sparse underwater acoustic channel estimation.

Description

technical field [0001] The invention relates to a fast channel estimation and signal synchronization method suitable for underwater acoustic modem, which is suitable for fast channel estimation and signal synchronization of physical layer data blocks in the field of underwater acoustic communication. [0002] technical background [0003] Real-time underwater acoustic communication prototypes or underwater acoustic modems are difficult to achieve high-speed and low-bit-error-rate performance. The reason is that underwater acoustic channels have dynamic double-spreading characteristics. Existing channel estimation methods generally come from wireless channels. Involving inverse problem solving, classic channel estimation methods include least squares estimation, least mean square error estimation, compressed sensing estimation, etc. But it is different from wireless channel with Rayleigh fading characteristics and shorter channel impulse response. The underwater acoustic chan...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B13/02
Inventor 秦祥照瞿逢重吴叶舟陈鹰徐敬
Owner ZHEJIANG UNIV
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