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Multi-carrier shallow sea underwater acoustic communication method with short guard interval

A technology of guard interval and underwater acoustic communication, which is applied in ultrasonic/sonic/infrasonic transmission systems, channel estimation, sustainable communication technology, etc. question

Active Publication Date: 2021-06-04
JIMEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In particular, for shallow seawater acoustic communication, due to the strong multipath characteristics of the underwater acoustic communication channel due to the reflection of the sea surface, sea bottom and obstacles and the inhomogeneity of the ocean interior, the multipath delay extension of the shallow seawater acoustic channel may reach Tens or even hundreds of milliseconds
The mutual interference between multipaths will cause severe amplitude fading and frequency selective fading, which will affect the performance of multi-carrier communication
The use of guard intervals between communication data blocks in shallow sea acoustic communication is an effective anti-multipath method, but too long guard intervals will lead to a reduction in the rate of multi-carrier underwater acoustic communication

Method used

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  • Multi-carrier shallow sea underwater acoustic communication method with short guard interval
  • Multi-carrier shallow sea underwater acoustic communication method with short guard interval
  • Multi-carrier shallow sea underwater acoustic communication method with short guard interval

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Embodiment 1

[0054] In multi-carrier water sound communication, the signal design transmitting end will communicate information binary data via a CyclicredUndancy CHECK (CRC), forward error correction, FEC), and overworked. Such as figure 1 As shown, in order to ensure the reliability of the high-rate communication system in the water acoustic channel, the digital information of the transmitting end passes through the following pre-processing: the binary data is inserted before the forward error correction, FEC) encodes a cyclic redundancy. Cyclic Redundancy Check, CRC, the cost of CRC is small, typically adequately adopted (ie, CRC-16); the CRC code is used to interleave with a matrix within the forward error correction coding and data frames. Considering the balance of complexity and error correction performance, select the forward error correction coding as a convolutional code.

[0055] String and converted binary information The multi-carrier modulation of the orthogonal Chirp signal form...

Embodiment 2

[0088] See Figure 9 This embodiment provides a multi-carrier shallow seawater channel system of short protection intervals, including:

[0089] The delay expansion estimation module 901 is used to estimate the delay spread of the channel according to the preamble sequence of the data frame, the data frame including a leader sequence and a data block;

[0090] The time window determination module 902 is configured to determine the number of time windows according to the time delay expansion, wherein the starting position of each of the analytical time windows is different;

[0091] The signal demodulation module 903 is used to demodulate the data block under each analysis time window to obtain demodulation results corresponding to each analysis time window;

[0092] The bit error rate determination module 904 is used to determine the bit error rate of each demodulation result;

[0093] Target communication data determination module 905 is used to maximize the minimum demodulation of ...

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Abstract

The invention discloses a short guard interval multi-carrier shallow sea underwater acoustic communication method and system. The method comprises the following steps: estimating time delay spread of a channel according to a preamble sequence of a data frame, wherein the data frame comprises the preamble sequence and a data block; a plurality of analysis time windows are determined according to the time delay extension, and the initial positions of the analysis time windows are different; demodulating the data block under each analysis time window to obtain a demodulation result corresponding to each analysis time window; determining the bit error rate of each demodulation result; and taking the demodulation result with the minimum bit error rate as target communication data. According to the method, a plurality of parallel analysis time windows are adopted to analyze and process the data blocks, and the optimal analysis time window is selected through the bit error rate to eliminate inter-carrier interference (ICI), so that the communication bit error rate of the system is reduced when the guard interval is short (the communication rate is high).

Description

Technical field [0001] The present invention relates to the field of water acoustic communication, and more particularly to a multi-carrier shallow seawater sound communication method for short protection intervals. Background technique [0002] Survey communication technology is very important in military or civilian use. At present, the water sound communication technology has become a core technology of water projects, such as marine observations, coastal development and other projects, these increasingly complex water projects put forward higher requirements for water sound communication, how to obtain underwater acquisition The information is efficient and reliable through the water voice channel, thereby constructing a water-sound communication network is a difficult point and hotspot for current water acoustic communication research. Therefore, the water sound communication physical layer design based on the labolated channel characteristics is essential. However, the wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L12/26H04B11/00H04B13/02
CPCH04L25/0204H04L25/022H04L25/0228H04L25/03821H04L43/0847H04B11/00H04B13/02Y02D30/70
Inventor 朱培斌陈文冯文杨光松李铁军邢海涛
Owner JIMEI UNIV
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