A physical layer security transmission method based on subcarrier sorting and xor operation in ofdm system

Abstract

The invention discloses an OFDM system physical layer safe transmission method based on subcarrier sorting and XOR operation. The method includes sorting subcarriers according to channel quality fromhighest to lowest by using known channel state information, dividing the subcarriers into two parts including a first half with comparatively good channel quality and a second half with comparativelypoor channel quality, processing original sending data bit symbols according to a corresponding relation, sending original signals and signals subjected to XOR operation separately, and performing joint receiving and decoding and restoring original data symbols by a receiving terminal. Simulation results show that the scheme achieves good anti-interception effect, achieves good security transmission requirements, and improves system bit error rate performance through power allocation and has certain stability and practicability.

Description

technical field [0001] The invention belongs to the technical field of wireless communication physical layer security, in particular to a physical layer security transmission method, which is applicable to various communication networks. Background technique [0002] The essence of physical layer security is to use the differences in channel characteristics of each user and the uncertainty of noise interference to encrypt sent information, making it difficult for eavesdroppers to obtain the amount of information sent. Compared with traditional security methods encrypted at the application layer, physical layer security The algorithm can encrypt the transmitted information through modulation at the physical layer to ensure the complete security of the information. Physical layer security is usually divided into two implementation methods: one is the interference transmission method, the transmission end uses the channel characteristics between the legal receiving end and inte...

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Problems solved by technology

The analysis found that the existing research on secure coding algorithms has the following deficiencies: 1) Most of the physical layer security coding requires that the channel condition of the legitimate receiver is higher than that of the eavesdropping channel, but in actual wireless communication transmission, it is difficult to guarantee this requirement; 2) The implementation of the security algorithm needs to obtain the real-time channel state information of the eavesdropper, and optimize the allocation of multi-carrier resources from the perspective of information theory, but it is difficult to obtain the channel state information of the eavesdropper in practice; 3) Most eavesdroppers are passive eavesdroppers, without considering The eavesdropper case of active eavesdropping

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