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Physical layer security enhancement method for free space optical network

A physical layer security and free space technology, applied in electrical components, electromagnetic wave transmission systems, transmission systems, etc., can solve problems such as high confidentiality requirements and low speed, and achieve the effects of improving utilization, improving security, and strengthening interference

Active Publication Date: 2018-12-07
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

4) Concealment, high requirements for confidentiality
Quantum cryptography communication based on the physical "uncertainty" and "inseparable" principles has absolute security, but due to the limitation of physical mechanism, the current quantum communication technology is only suitable for low-speed signal transmission

Method used

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  • Physical layer security enhancement method for free space optical network
  • Physical layer security enhancement method for free space optical network
  • Physical layer security enhancement method for free space optical network

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Embodiment Construction

[0036] Such as figure 1 As shown, the physical layer security enhancement method of the free space optical network provided by the present invention is described in detail as follows:

[0037] Step S1, the legal user Alice of the sender sends a data signal, and the interference module sends an interference signal according to channel state estimation; in the optical fiber hybrid network, there are two legal users Alice and Bob, the eavesdropper Eve, and an interference module, and the power of the interference module sender Controllable jamming signals. At the signal sending end, after the legitimate user Alice and the interference module send out the signal, the interference signal is sent by the power control interference module under channel state estimation, and there are multiple interference modules.

[0038] Step S2, use the modulator to modulate the data signal and the interference signal according to different data symbols; after the signal is sent out, use the MWPPM...

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Abstract

The invention relates to a physical layer security enhancement method for a free space optical network. The physical layer security enhancement method for the free space optical network comprises thefollowing steps: S1, a sender legitimate user Alice sends a data signal, and an interference module sends an interference signal according to channel state estimation; S2, signal modulation is performed on the data signal and the interference signal according to different data symbols by means of a modulator; S3, the modulated optical signals of the data signal and the interference signal are encoded by using different encoders; S4, the encoded data signal and interference signal are coupled to an atmospheric turbulence channel for transmission by using a coupler; S5, a receiving end legitimate user Bob uses a decoder to perform corresponding matching decoding on the received optical signals; S6, a photo-detector APD is used to perform photoelectric detection on the signals; S7, the legitimate user demodulates the signals which are performed the photoelectric detection by using a demodulator to obtain the data signal sent by the sender Alice. Therefore, the security of the FSO transmission system is improved.

Description

technical field [0001] The invention belongs to the field of optical communication technology improvement, in particular to a physical layer security enhancement method of a free space optical network. Background technique [0002] Free space optical (FSO) communication has the advantages of high bandwidth, no license, rapid deployment and high flexibility, and is also considered to be a promising solution to the last mile problem in wireless communication. FSO can provide very high-speed point-to-point communication when it is difficult to achieve communication using optical fiber. In addition, FSO communication can be used in many optical links, such as satellite and ground data links, ad hoc relay links that are not limited by optical fiber networks, etc. However, FSO can also be affected by optical eavesdropping, for example, when the eavesdropper deliberately blocks the beam to block the line of sight of the intended receiving end, or when the diverging beam has a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/564H04B10/516H04B10/524
CPCH04B10/516H04B10/524H04B10/564
Inventor 吉建华陈雪梅王可徐铭张志朋杨淑雯
Owner SHENZHEN UNIV
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