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Underwater acoustic communication method and device

A technology of underwater acoustic communication and information code, which is applied in the direction of using the return channel for error prevention/detection, digital transmission systems, electrical components, etc., and can solve problems such as communication efficiency decline, increased system overhead, and underwater acoustic link instability. To achieve the effect of improving reliability, improving communication efficiency and reducing quantity

Inactive Publication Date: 2017-09-15
深圳市朗信浩通科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the delay effect of underwater acoustic transmission, in order to establish a reliable and stable link connection, if frequent handshakes and feedback ACK signals are required, the communication efficiency will be seriously reduced
Due to the instability of the underwater acoustic link, the receiver will require the transmitter to retransmit repeatedly after an error in the inspection, which increases the system overhead

Method used

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  • Underwater acoustic communication method and device

Examples

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Embodiment 1

[0047] An underwater acoustic communication method proposed in Embodiment 1 of the present invention, such as figure 1 shown, including the following steps:

[0048] S11. The sending end adds redundant supervisory symbols to the original data according to the BCH(31,16) encoding for implementing error correction and error detection to form encoded data;

[0049] The BCH code is taken from the abbreviation of Bose, Ray-Chaudhuri and Hocquenghem, and is a coding method that is widely used in coding theory, especially in error correction codes.

[0050] BCH code is an important type of error correction code, which divides the information sequence to be sent by the source into message groups according to a fixed group of k bits, and then independently transforms each message group into a binary format of n (n>k) Groups of numbers are called codewords. If the number of message groups is M, the entirety of the M codewords thus obtained is called a block code with a code length of ...

Embodiment 2

[0064] An underwater acoustic communication device proposed in Embodiment 2 of the present invention, such as image 3 shown, including:

[0065] The encoding module 101 is configured to add redundant supervisory symbols to the original data according to BCH(31,16) encoding to form encoded data.

[0066] BCH(31,16) encoding is realized by FPGA circuit. For example: related algorithms can be implemented through digital logic circuits composed of XILINK low-power FPGA chips.

[0067] The FPGA circuit mainly includes: low-power FPGA, signal integration circuit, data encryption and decryption unit, memory, clock unit, and power management unit.

[0068] The 17th to 31st bits of the information codeword are BCH parity bits, which are used to perform error correction coding on the first 16 bits of the information codeword; the 32nd bit of the information codeword is an even parity bit, which is used for Controlling the number of all 1s in the information codeword to be an even nu...

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Abstract

The invention discloses an underwater acoustic communication method, comprising the following steps: ensuring that a sending end performs encoding based on BCH (31,16) and adds a redundant supervision code element for achieving error correction and error detection to raw data to form coded data; transmitting the coded data according to an underwater acoustic channel; enabling a receiving end to receive the coded data and decode the data based on the BCH (31,16) to obtain decoded data; monitoring whether the decoded data is correct; when the number of generated errors is not greater than the maximum error correction and detection number of the BCH (31, 16), enabling the receiving end to perform correction through automatic error correction; and when the number of the generated errors is greater than the maximum error correction and detection number of the BCH (31, 16), enabling the receiving end to send a receiving failure message to the sending end, and enabling the sending end to resend the coded data after receiving the message. The invention also discloses an underwater acoustic communication device; and the device has a stronger forward error correction capability, is simple to achieve encoding and decoding, and is high in reliability.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an encoding method and device for underwater acoustic communication. Background technique [0002] Applications such as marine environment monitoring, real-time monitoring of submarine pollutants, national defense marine defense detection, submarine inspection, and real-time alarm of large-scale submarine intrusion all require the use of submarine underwater acoustic communication technology for real-time data transmission. Currently, underwater acoustic communication technology is often used underwater. Sound as a data communication medium. However, due to the characteristics of the underwater acoustic channel, the effective bandwidth of underwater acoustic communication is low, the transmission time is prolonged, the signal fluctuates and fades seriously, the bit error rate is high, and the loss is large, making it very difficult for underwater acoustic communic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18H04B13/02
Inventor 范世杰
Owner 深圳市朗信浩通科技有限公司
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