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Method and system for improving reliability of underwater blue-green laser communication

A blue-green laser, reliable technology, applied in the direction of optical transmission system, transmission system, electromagnetic wave transmission system, etc., can solve the problems of poor anti-interference ability, high bit error rate, low communication efficiency, etc., to avoid misjudgment, Effects of Improving Judgment Accuracy and System Bit Error Rate Performance

Pending Publication Date: 2022-04-12
NANJING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology

[0004] Purpose of the invention: In view of the above problems, the present invention proposes a method and system for improving the reliability of underwater blue-green laser communication, which overcomes the problems of high bit error rate and low communication efficiency caused by the poor OOK anti-interference ability of the underwater laser communication system , in the face of a complex channel environment, it has a good suppression effect on noise, and effectively avoids the loss of pulse information caused by underwater light scattering and reflection and plankton occlusion.

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[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in the present invention are a part of the embodiments of the present invention, but not all of the embodiments.

[0034] A method for improving the reliability of underwater blue-green laser communication according to the present invention, the process is as follows figure 1 , by preprocessing the original sampling data of the underwater laser pulse signal, the noise is suppressed, the bit error performance of the system is improved, the judgment accuracy is improved, and the signal recovery in the complex underwater environment has a good effect; the specific steps are: as follows:

[0035] Step 1: The receiving end uses PMT (Photomultiplier Tube, photomultiplier tube) to continuously detect laser pulse information frames, and the data amount of each frame is the same.

[0036] Step 2: As f...

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Abstract

The invention discloses a method and a system for improving underwater blue-green laser communication reliability, which belong to the field of underwater wireless communication, and are characterized in that data preprocessing and peak value judgment are combined with adaptive threshold value judgment, data preprocessing and denoising are carried out on pulses of a laser communication system, peak value judgment is carried out on denoised data, and the reliability of underwater blue-green laser communication is improved. And meanwhile, recovering the laser information in combination with a self-adaptive threshold judgment mode, and finally recovering the laser system transmitting end information. According to the invention, the defects in the prior art are overcome, a good inhibition effect on underwater noise interference of laser communication is achieved, information loss caused by underwater laser refraction and scattering is effectively avoided, and the reliability of underwater laser communication is improved.

Description

technical field [0001] The invention belongs to the field of underwater wireless communication, and in particular relates to a method and a system for improving the reliability of underwater blue-green laser communication. Background technique [0002] Underwater wireless communication technology generally includes radio frequency communication technology, acoustic wave communication technology and visible light communication technology. The transmission performance, advantages and disadvantages of the three are different. Seawater has good electrical conductivity. The propagation of radio frequency signals in seawater by electromagnetic communication will produce a very serious adhesion effect, resulting in very fast signal attenuation and very short transmission distance; while acoustic communication Compared with the transmission distance, the transmission distance is longer, but the transmission rate is low and the transmission delay is large. The visible light communica...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/508H04B10/516H04B10/80
CPCY02D30/70
Inventor 龚从安胡芳仁赵晓燕
Owner NANJING UNIV OF POSTS & TELECOMM
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