Safe and accurate wireless transmission method based on multi-phased array direction modulation

Abstract

The invention discloses a safe and accurate wireless transmission method based on multi-phased array direction modulation. The safe and accurate wireless transmission method comprises the following steps: a sending end encodes the voice information to generate a binary digital sequence, carries out baseband modulation on the digital sequence to obtain a symbol sequence, carries out serial-parallelconversion on the symbol sequence to obtain K paths of symbols, respectively carries out direction modulation and artificial noise injection on the K paths of symbols to obtain a baseband signal, andsends the baseband signal to a legal receiving end through K pairs of phased-array antennas; and a receiving end receives baseband signals through a single-phase phased array, respectively receives signals from K directions to obtain K paths of symbols, performs serial-to-parallel conversion to obtain a path of symbol sequence, performs demodulation, recovers a binary digital sequence, and performs decoding to recover voice information. According to the scheme, confidential information can be safely and accurately sent to the designated position, safe and accurate information transmission isachieved, and the safety of the wireless transmission scheme can be guaranteed no matter where an eavesdropping user is located.

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...

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

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