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Physical layer hidden transmission device and method based on constant envelope signal

A constant envelope, transmission device technology, applied in secure communication, electrical components, AM carrier system, etc., can solve the problems of identification stealing or interference destruction, weak concealment, low signal level perception, etc., and achieve high frequency band utilization. , The effect of improving confidentiality and strong system confidentiality

Active Publication Date: 2021-07-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing anti-interception and anti-jamming technologies for various constant envelope signals usually use direct sequence spread spectrum technology, frequency hopping technology, etc. to achieve low sensitivity at the signal level or to perform encryption and decryption at the protocol layer. Earlier, there were many effective countermeasures against these encryption and concealment technologies, so the concealment of these technology-related devices is weak, and it is easy to be identified, stolen or destroyed by interference

Method used

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  • Physical layer hidden transmission device and method based on constant envelope signal
  • Physical layer hidden transmission device and method based on constant envelope signal
  • Physical layer hidden transmission device and method based on constant envelope signal

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Embodiment 1

[0056] Such as figure 1 As shown, a physical layer covert transmission device based on a constant envelope signal disclosed in this embodiment includes a constant envelope signal transmitting module, a covert information acquisition and modulation module, a control module, an impedance switching module, and a constant envelope signal demodulation module. module, an envelope detection module, a covert information extraction module and a covert information decoding module.

[0057] Wherein, the constant envelope signal transmitting module, concealed information acquisition and modulation module, control module and impedance switching module constitute the physical layer concealed information transmitting end, and the constant envelope signal demodulation module, envelope detection and concealed information decoding module constitute the physical layer The layer hides the information receiving end.

[0058] The constant envelope signal transmitting module is used for generating ...

Embodiment 2

[0082] The specific implementation process of the present invention will be described by taking the standard bluetooth transmission system and the physical layer covert transmission device of the two-way impedance switching constant envelope signal as examples.

[0083] The working frequency band of the standard Bluetooth transmission protocol is the 2.4GHz ISM frequency band. Since there are many radios working in this frequency band, the Bluetooth transmission system often uses frequency hopping to resist interference during the transmission process. The Bluetooth transmission system has 79 frequency points, the carrier frequency is (2402+k) MHz, and the frequency hopping rate is 1600 hops per second. In the baseband, the Bluetooth transmission system adopts GFSK constant envelope modulation as the modulation method of the original information, and the information transmission rate is 1Mb / s.

[0084] The system uses the standard bluetooth transmission system as the constant ...

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Abstract

The invention relates to a physical layer hidden transmission device and method based on a constant envelope signal, and belongs to the field of wireless communication. According to the invention, the impedance switching device is embedded between the constant envelope signal generator and the transmitting antenna, so the fast switching of the antenna impedance is realized, and the envelope of an original signal is changed at a radio frequency transmitting end in a mode of analog keying, so that the purpose of realizing hidden transmission in a physical layer is achieved; meanwhile, through a multi-antenna mode, on the basis of not influencing original signal demodulation, interference signals are added to the hidden information, and the transmitted hidden information is encrypted. According to the method, envelope detection, channel estimation and a corresponding hidden information decoder are used at a receiving end to obtain hidden information after interference signals are removed, and a constant envelope signal demodulator is used to obtain original constant envelope information. The method has the characteristics of low power consumption, low cost, high concealment and strong anti-interception capability.

Description

technical field [0001] The invention relates to a physical layer covert transmission device and method based on a constant envelope signal, belonging to the field of wireless communication. Background technique [0002] The wireless communication technologies commonly used in the Internet of Things include Zigbee technology, Wifi technology, Bluetooth (Bluetooth) technology, and LoRa technology. Among them, Zigbee technology, Bluetooth technology, Lora technology, etc. are all constant envelope signals, which encode information by changing the phase or frequency of the transmission signal, and the relevant demodulators only demodulate information by detecting the phase or frequency of the transmission signal. Therefore, these constant-envelope signals lack the detection and utilization of the physical layer signal amplitude. Therefore, for these technologies, the information of the physical layer signal amplitude can be modulated without affecting the demodulation of the ori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04K1/02H04K1/10H04L27/02
CPCH04K1/02H04K1/10H04L27/02
Inventor 于季弘刘家豪杜彩卉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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