A secure OFDM transmission method combining subcarrier pairing and signal inversion

A technology for signal inversion and secure transmission, applied in security devices, transmission systems, digital transmission systems, etc., can solve problems such as reciprocity errors, achieve simple system models, improve system security, and improve system average bit error rate performance Effect
CN108684037BActive Publication Date: 2020-03-17XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2020-03-17

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Abstract

The invention discloses an OFDM safe transmission method combining subcarrier pairing and signal inversion. The method utilizes known channel state information to rearrange the sequence numbers of each subcarrier, and divides it into two parts with the midpoint as the boundary. Set the first half as a bad carrier and the second half as a good carrier. A pairing mapping relationship is defined between the bad channel and the good channel, the inverted signal and the useful signal are sent separately, and the receiving end performs joint reception. The average bit error rate of the system and a lower bound of the system's confidentiality capacity are deduced by using the theory of order statistics theorem, and the simulation verification is carried out. The simulation results show that our scheme has achieved a good anti-eavesdropping effect and achieved a good security transmission Requirements, and has a certain stability and practicality.
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Description

technical field

[0001] The invention belongs to the technical field of wireless communication physical layer security, and in particular relates to an OFDM security transmission strategy combining subcarrier pairing and signal inversion, which is applicable to various communication networks. Background technique

[0002] The natural openness and broadcasting nature of wireless communication systems have brought great challenges to transmission security. In order to ensure communication security, the traditional method is to learn from the security mechanism of the wired network and implement security protection at the upper layer of the protocol. This method assumes that the eavesdropper has limited computing power and cannot crack it in a short time. However, with the development of high-speed computers, traditional encryption methods are threatened. Physical layer security (PLS) technology emerged as a security method to assist the upper layer in the field of secure commu...

Claims

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