Method for processing Doppler expansion of underwater sound high-speed OFDM communication

A technology of Doppler expansion and processing method, which is applied in the field of underwater acoustic communication, can solve the problems of large Doppler residual, poor effect, and unsatisfactory effect, and achieve high processing performance and strong adaptability

Inactive Publication Date: 2014-01-01
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

Compared with the previous two types of methods, this type of method has a better effect, but when the channel changes rapidly (such as the relative movement speed between transceivers is large), this method will lead to excessive Doppler residual, so after demodulation is also less effective
[0007] The effects of the above three types of prior art methods are not ideal, especially for high-speed OFDM un...

Method used

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  • Method for processing Doppler expansion of underwater sound high-speed OFDM communication
  • Method for processing Doppler expansion of underwater sound high-speed OFDM communication
  • Method for processing Doppler expansion of underwater sound high-speed OFDM communication

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Embodiment Construction

[0038] In the present invention, the mathematical models of the OFDM and underwater acoustic channels are as follows.

[0039] 1. OFDM mathematical model

[0040] Let the number of OFDM subcarriers be K, and the frequency of the kth subcarrier be f k = f c +kΔf, where Δf=1 / T is the subcarrier spacing, T is the OFDM symbol duration, f c is the carrier frequency, then the transmitted signal at the sending end can be expressed as:

[0041] s ( t ) = Re { [ Σ k = 1 K s [ k ] e j 2 πkΔft q ( t ) ] e j 2 π f ...

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Abstract

The invention discloses a method for processing Doppler expansion of underwater sound high-speed OFDM communication. The method relates to a Doppler estimation and compensation module, a channel estimation module based on compression sensing and a part fast Fourier transform demodulation module, wherein the key portion is the part fast Fourier transform demodulation module and output of the other two modules serves as input of the part fast Fourier transform demodulation module. According to the method for processing Doppler expansion of underwater sound high-speed OFDM communication, a traditional OFDM demodulation method is modified, part Fourier transform is firstly adopted to serve as a demodulation method and part of Doppler expansion can be eliminated in the process of demodulation; due to the fact that Doppler expansion is processed for twice, influence on signals by Doppler expansion can be reduced to a lower range and the method is particularly high in adaptation to a rapidly-changed underwater sound channel. Therefore, the high processing performance of Doppler expansion is achieved.

Description

technical field [0001] The invention relates to a processing method for Doppler expansion in a high-speed OFDM underwater acoustic communication receiver, and belongs to the technical field of underwater acoustic communication. Background technique [0002] With more and more frequent activities in the ocean, people have higher and higher requirements on the speed of underwater acoustic communication. Orthogonal Frequency Division Multiplexing (OFDM) has become the preferred technology for high-speed underwater acoustic communication due to its high frequency band utilization and low complexity. Compared with terrestrial radio channels, the available channel bandwidth of underwater acoustic channels is lower and the speed of underwater sound is not high (about 1500m / s). Even if there is a small relative motion between underwater moving targets, it will cause a large Doppler frequency shift, which will cause serious Inter-Carrier Interference (ICI) at the receiving end of th...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
Inventor 王彪支志福朱志宇曾庆军
Owner JIANGSU UNIV OF SCI & TECH
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