Low-frequency underwater acoustic communication equalization processing method based on receiving array

A technology of underwater acoustic communication and processing method, which is applied to the shaping network, baseband system, baseband system components and other directions in the transmitter/receiver, can solve the problems affecting the demodulation performance, the complexity of the receiving and processing system, etc., to improve the balance The effect of input signal-to-noise ratio, improving demodulation processing performance, and improving array processing performance

Pending Publication Date: 2021-09-17
HARBIN ENG UNIV
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Problems solved by technology

[0004] Aiming at the problem that the length of the equalizer for the joint equalization processing of the existing multi-array elements is too long, which makes the receiving processing system

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  • Low-frequency underwater acoustic communication equalization processing method based on receiving array
  • Low-frequency underwater acoustic communication equalization processing method based on receiving array
  • Low-frequency underwater acoustic communication equalization processing method based on receiving array

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0046] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0048] A kind of equalization processing method of the low-frequency underwater acoustic communication based on ...

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Abstract

The invention discloses a low-frequency underwater acoustic communication equalization processing method based on a receiving array, solves the problems that a receiving processing system is complicated and the demodulation performance is influenced due to the fact that the length of an existing equalizer for multi-array element joint equalization processing is too long, and belongs to the technical field of underwater acoustic communication. The method comprises the following steps: receiving a frequency domain sound pressure signal through a full-aperture vertical array to calculate a vertical mode function matrix psi of a normal wave mode in a sound field; obtaining a modal filter according to the [psi], performing filtering on the received signal matrix p, and achieving modal separation, wherein the separated modal matrix is as follows: a received signal ym(k) corresponding to the mth-order modal in the matrix is obtained, and under the condition of the high received signal-to-noise ratio, the received signal ym(k) is demodulated through a single-channel self-adaptive decision feedback equalization processing method; and demodulating the received signal ym(k) by using a multi-mode joint decision feedback equalization processing method under the condition of low received signal-to-noise ratio.

Description

technical field [0001] The invention relates to an equalization processing method for low-frequency underwater acoustic communication based on a receiving array, and belongs to the technical field of underwater acoustic communication. Background technique [0002] The source of the bit error rate in underwater acoustic communication technology is mainly inter-symbol interference and noise interference. Using the receiving array and matching spatial signal processing means can improve the receiving signal-to-noise ratio and suppress inter-symbol interference, which will be better than single-array Metaprocessing performance. Therefore, it is very necessary to study array receiving processing methods in shallow sea low-frequency telecommunication systems with severe channel fading and limited input signal-to-noise ratio. For the case of vertical array communication, two demodulation methods are usually used: single-channel equalization processing after beamforming and multi-a...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04B13/02H04B11/00
CPCH04L25/03006H04B13/02H04B11/00
Inventor 崔宏宇张居成郑翠娥韩云峰孙大军张殿伦
Owner HARBIN ENG UNIV
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