Physical layer secure transmission method and system based on decomposition and distributed modulation

Abstract

The invention discloses a physical layer secure transmission method and a system based on decomposition and distributed modulation. The controller decomposes the high-order modulation into a pluralityof quadrature phase shift keying modulations, and each quadrature phase shift keying modulation is further decomposed into two mutually orthogonal binary phase shift keying modulations; expected datainformation to be sent is represented by two binary phase shift keying signals and is sent by two transmitters respectively, channel state information is shared between the transmitters, and the transmitters preprocess the sent signals respectively and then send the preprocessed sent signals to a target receiver; and the target receiver receives a mixed signal of the two binary phase shift keyingsignals, and expected data information is recovered after filtering. According to the invention, decomposition, distributed modulation and sending are carried out on high-order modulation, and each distributed signal does not carry complete expected data information of the target receiver, so that secret transmission of data is realized, an eavesdropper is effectively prevented from acquiring theexpected data information, and secret transmission of the expected data information is realized.

Description

Technical field [0001] The invention belongs to the field of wireless communication technology, and in particular relates to a physical layer safe transmission method and system based on decomposition and distributed modulation. Background technique [0002] With the rapid development of wireless communication technology, information security has become an important issue. Due to the natural openness and broadcasting nature of wireless transmission, wireless communication systems face more serious security threats than traditional wired communication systems. Eavesdroppers may illegally eavesdrop on users' sensitive information through wireless channels. Physical layer security plays a fundamental role in improving the confidentiality of information. The basic principles of physical layer security can be divided into two types: first, the realization of encryption based on wireless channel characteristics; second, the realization of reliable transmission based on confidentiality ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the problem existing in the existing technology is: the existing physical layer security method is at the transmitting end, for example, the transmitter constructs artificial noise, which requires additional transmission power to interfere with the eavesdropper’s channel, and even requires special equipment to Send artificial noise, and the artificial noise sent may also cause interference to other users within the communication range

For example, technology-based wireless network anti-eavesdropping method based on interference alignment, through the transmitter to send artificial noise to interfere with the eavesdropper, in a system with limited total transmission power, it will cause the transmission power of the desired signal to decrease, resulting in the spectral efficiency of the legal receiver. decline

Technology 2 is based on divide-and-conquer cooperative interference, using signals sent by other legal communication nodes within the communication range of the source and destination to interfere with eavesdroppers, requiring the deployment of multiple legal communication nodes, thus consuming more transmission power

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