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A Physical Layer Security Enhancement Method for Free Space Optical Networks

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

Active Publication Date: 2021-08-06
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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  • A Physical Layer Security Enhancement Method for Free Space Optical Networks
  • A Physical Layer Security Enhancement Method for Free Space Optical Networks
  • A Physical Layer Security Enhancement Method for Free Space Optical Networks

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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 the 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 legal 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] In step S2, the data signal and the interference signal are modulated by the modulator according to different data symbols; after the signal is sent out, the transmitt...

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Abstract

The invention relates to a method for enhancing physical layer security of a free space optical network, comprising: S1, sending a data signal by a legitimate user Alice of the sender, and an interference module sending an interference signal according to channel state estimation; S2, interfering with the data signal and the interference according to different data symbols The signal is modulated by a modulator; S3, using different encoders to encode the modulated data signal and the optical signal of the interference signal; S4, using a coupler to couple the encoded data signal and interference signal to the atmospheric turbulence channel Transmission; S5. The legal user Bob at the receiving end uses the decoder to perform matching decoding on the received optical signal; S6. Uses the photoelectric detector APD to perform photoelectric detection on the signal; S7. The legal user uses the demodulator to perform photoelectric detection on the signal Perform demodulation to obtain the data signal sent by the sender Alice. Therefore, the safety 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 Patents(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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