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Secret communication method and system

A technology of confidential communication and confidential information, applied in the field of communication, can solve problems such as system paralysis, achieve the effect of ensuring the suppression effect and improving the confidentiality performance

Active Publication Date: 2021-07-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing artificial noise technology is mainly used in fixed-frequency communication systems. Once the system is actively interfered by the eavesdropper, our communication system will face the risk of paralysis

Method used

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  • Secret communication method and system

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Embodiment Construction

[0072] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0073] Such as figure 1 As shown, a secure communication method includes the following steps:

[0074] S1. The frequency hopping transmitter for secure communication generates a secret information sequence s(n) and an artificial noise sequence c(n), and the sum signal of the two is transmitted after frequency hopping modulation and radio frequency modulation:

[0075] S101. At the frequency hopping transmitter for secure communication, the artificial noise sequence c(n) obeys a Gaussian distribution with a mean value of 0, and is not correlated with the confidential information s(n); the sum signal of the two is subjected to frequency hopping modulation and radio frequency modulation and the frequency hopping pattern and artificial noise i...

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Abstract

The invention provides a secret communication method and system. The secret communication method comprises the following steps that S1, a secret communication frequency hopping transmitter generates a secret information sequence s (n) and an artificial noise sequence c (n), and a sum signal of the secret information sequence s (n) and the artificial noise sequence c (n) is transmitted after frequency hopping modulation and radio frequency modulation; S2, an authorized frequency hopping receiver performs frequency hopping synchronization by using synchronization hopping information to obtain a propagation time delay estimation value, and relieves the frequency hopping of the received signal; S3, frequency offset and channel attenuation estimation are performed on the received signal by using the synchronization hopping information, and a local reference artificial noise sequence of the receiver is compensated for by using the obtained estimation value; S4, the local reference artificial noise sequence is subtracted from the digital baseband receiving signal after compensation to suppress an artificial noise component in the baseband receiving signal; and S5, the baseband receiving signal is demodulated after the artificial noise suppression, and the secret information sent by the secret communication frequency hopping transmitter. According to the method, the secrecy performance of a communication system is effectively improved, and the suppression effect of the artificial noise at the authorized frequency hopping receiver is ensured.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for secure communication under artificial noise suppression. Background technique [0002] With the gradual advancement of 5G commercialization, communication security and confidentiality will still be the core measurement indicators of future communication systems. However, in the complex modern electromagnetic environment, ubiquitous interference and eavesdropping seriously threaten the security of wireless communication. In order to improve the security performance of the communication system, frequency hopping technology is widely used to counter interference and reconnaissance. However, under long-term strong monitoring, the frequency hopping parameters of our communication frequency hopping transmitter can be accurately estimated by the enemy. Once this happens, the confidential information in the existing frequency hopping communication system will be contin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04K1/02H04B1/7136H04B1/7156
CPCH04K1/02H04B1/7136H04B1/7156Y02D30/70
Inventor 宋长庆赵梦韵秦俪之赵宏志邵士海唐友喜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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