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A short guard interval multi-carrier shallow sea acoustic communication method

A guard interval, underwater acoustic communication technology, applied in ultrasonic/sonic/infrasonic transmission systems, channel estimation, sustainable communication technology, etc. The effect of reducing communication bit error rate and eliminating inter-carrier interference

Active Publication Date: 2022-07-08
JIMEI UNIV
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  • 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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  • A short guard interval multi-carrier shallow sea acoustic communication method
  • A short guard interval multi-carrier shallow sea acoustic communication method
  • A short guard interval multi-carrier shallow sea acoustic communication method

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Experimental program
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Effect test

Embodiment 1

[0054] In the multi-carrier underwater acoustic communication, the signal design and the transmitting end perform serial-to-parallel conversion on the binary data of the communication information after CRC check (cyclic redundancy check, CRC), forward error correction (FEC) encoding and interleaving. like figure 1 As shown, in order to ensure the reliability of the high-speed communication system in the underwater acoustic channel, the digital information at the transmitting end undergoes the following preprocessing operations: inserting cyclic redundancy into the binary data before forward error correction (FEC) encoding Check code (cyclic redundancy check, CRC), the overhead of CRC is very small, usually 16bit is enough (ie CRC-16); the CRC code is then subjected to forward error correction coding and matrix interleaving in the data frame. Considering the balance between complexity and error correction performance, the forward error correction coding is selected as the convo...

Embodiment 2

[0088] see Figure 9 , this embodiment provides a short guard interval multi-carrier shallow underwater acoustic communication system, the system includes:

[0089] a delay spread estimation module 901, configured to estimate the delay spread of a channel according to a preamble sequence of a data frame, where the data frame includes a preamble sequence and a data block;

[0090] a time window determination module 902, configured to determine the number of analysis time windows according to the delay extension, wherein the starting positions of the analysis time windows are different;

[0091]a signal demodulation module 903, configured to demodulate the data blocks under each analysis time window to obtain a demodulation result corresponding to each analysis time window;

[0092] a bit error rate determination module 904, configured to determine the bit error rate of each demodulation result;

[0093] The target communication data determination module 905 is configured to s...

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Abstract

The invention discloses a short guard interval multi-carrier shallow seawater acoustic communication method and system. The method includes: estimating a delay spread of a channel according to a preamble sequence of a data frame, the data frame including a preamble sequence and a data block; determining a plurality of analysis time windows according to the delay spread, wherein each analysis time The starting positions of the windows are different; demodulate the data blocks under each analysis time window to obtain the demodulation result corresponding to each analysis time window; determine the bit error rate of each demodulation result; The minimum rate demodulation result is the target communication data. The invention adopts multiple parallel analysis time windows to analyze and process the data block, selects the best analysis time window through the bit error rate to eliminate the inter-carrier interference (ICI), and then reduces the system performance when the guard interval is short (high communication rate). communication bit error rate.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to a short guard interval multi-carrier shallow underwater acoustic communication method. Background technique [0002] The research on underwater acoustic communication technology is of great significance in both military and civil applications. At present, underwater acoustic communication technology has become the core technology for underwater projects, such as ocean observation, coastal zone development and other projects. These increasingly complex underwater projects put forward higher requirements for underwater acoustic communication. The efficient and reliable transmission of all kinds of information through the underwater acoustic channel, thus constructing an underwater acoustic communication network is the difficulty and hotspot of current underwater acoustic communication research. Therefore, the physical layer design of underwater acoustic communicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04L43/0823H04B11/00H04B13/02
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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