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Safe and precise wireless transmission method based on multiphase array direction modulation

A technology of directional modulation and wireless transmission, applied in radio transmission systems, transmission systems, multi-carrier systems, etc., can solve problems such as communication security cannot be guaranteed, useful information cannot be normally demodulated, and confidential information is easily intercepted

Active Publication Date: 2021-05-14
NORTHWEST UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direction modulation technology uses the combination of radio frequency components at the radio frequency end or uses beamforming and artificial noise at the baseband end to make the signal constellation diagram received in the desired direction consistent with the baseband standard constellation diagram of the transmitted signal, and receive signals in other undesired directions. The received signal constellation diagram is disturbed or seriously polluted by artificial noise, so that legitimate users in the desired direction can correctly demodulate confidential information, while eavesdropping users in non-expected directions cannot normally demodulate useful information
[0003] Traditional directional modulation technology is usually designed based on a single-phase array, and it is assumed that the eavesdropper and the desired user are located in different directions; however, in practical application scenarios, the eavesdropper and the desired user may be located in the same direction
This leads to similar signals received by the eavesdropper and the expected user, especially when the eavesdropper is closer to the transmitter, the quality of the signal received by the eavesdropper is better than that of the expected user, confidential information is easily intercepted, and communication security cannot be guaranteed

Method used

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  • Safe and precise wireless transmission method based on multiphase array direction modulation
  • Safe and precise wireless transmission method based on multiphase array direction modulation
  • Safe and precise wireless transmission method based on multiphase array direction modulation

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Embodiment Construction

[0029] The present invention proposes a safe and accurate wireless transmission method based on multi-phased array directional modulation. The schematic diagram of its basic principle is as follows figure 1 shown.

[0030] The sender generates a binary digital sequence for the voice information through source coding and channel coding, and then performs baseband modulation on the digital sequence to obtain a symbol sequence, serially converts the symbol sequence into K-channel symbols, and performs direction modulation and injection on the K-channel symbols respectively The baseband signal is obtained by artificial noise, and the baseband signal is sent to the legal receiving end through K phased array antennas;

[0031] At the receiving end, the legitimate user receives the baseband signal through a single-phase phased array, performs multi-beam reception on the signals from K directions respectively, obtains K symbols, performs serial-to-parallel conversion to obtain a symbo...

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Abstract

The invention discloses a safe and accurate wireless transmission method based on multi-phased array directional modulation. The steps of the method are as follows: the voice information of the sending end is coded to generate a binary digital sequence, and then baseband modulation is performed on the digital sequence to obtain a symbol sequence. The symbol sequence is serially converted into K-channel symbols, and the K-channel symbols are directional modulated and injected with artificial noise to obtain baseband signals, and the baseband signals are sent to the legal receiving end through K phased array antennas; the receiving end passes single-phase The control array receives the baseband signal, receives the signals from K directions separately, obtains K symbols, performs serial-to-parallel conversion to obtain a symbol sequence, and then demodulates to restore the binary number sequence, and then decodes to restore the voice information. This scheme can safely and accurately send confidential information to a designated location, realizing safe and accurate transmission of information, and no matter where the eavesdropping user is located, the security of this wireless transmission scheme can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of multi-antenna transmission, and in particular relates to a safe and precise wireless transmission method based on multi-phased array direction modulation. Background technique [0002] With the rapid development of wireless communication services, the privacy and security of information transmission become more and more important. Due to the broadcast nature of wireless transmission media and the lack of physical boundaries, confidential information is easily eavesdropped by unauthorized users. Therefore, information security has always been a core issue in wireless communication. Traditional security research mainly focuses on MAC (Medium Access Control) layer encryption. But in the MAC layer, only the data frame is encrypted, and the control frame is not protected at all. Once an eavesdropper steals the control information, the confidential information is no longer safe. With the rapid development of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36
CPCH04B7/0408H04B7/0456H04B7/0617H04B7/086H04L27/36H04L27/38
Inventor 张薇彭进业祝轩李斌王珺乐明楠
Owner NORTHWEST UNIV
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