Secure multi-user pilot authentication method based on hierarchical two-dimensional feature coding

Abstract

A secure multi-user pilot authentication method based on hierarchical two-dimensional feature coding is provided. Original pilot signals specified by each legitimate user (LU) are now randomized and coded into subcarrier activation modes (SAPs). Although these coded SAPs are covered by malicious signals and overlap and interfere with each other in a wireless environment, the coded SAPs can still be separated, identified and reliably decoded into codewords and ultimately converted into corresponding pilot signals, thereby ensuring SMPA. A five-layer hierarchical decoding (HD) model for SMPA isconstructed to demonstrate the principles of feature coding and decoding. A reliability constrained contraction (RBC) theory is proposed to narrow the constraint interval, which is completed by a codebook partitioning technology for H2DF. By optimizing the number of sub-codebooks, the upper and lower IEP boundaries shrink and coincide. Supported by the H2DF coding theory, the method can show goodstability in terms of SMPA.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a secure multi-user pilot authentication method based on layered two-dimensional feature coding. Background technique [0002] With the development of wireless communication technology, the security risks brought by the broadcast characteristics of wireless channels are increasing day by day, and harmful signal sources can interfere with the communication links of other normal nodes more efficiently. Although the upper-layer password encryption and decryption system can guarantee the security of the wireless communication environment to a certain extent, with the development of computer technology, the upper-layer encryption system faces the risk of being deciphered, and harmful signal sources can further obtain legitimate user information. In response to this phenomenon, the physical layer security mechanism has attracted extensive attention and research. At present, in vi...

AI Technical Summary

Problems solved by technology

Therefore, these pilot signals can be known by the attacker. After the attacker learns the frame synchronization information and pilot information of the legitimate transceiver, he can further launch a pilot awareness attack. During this period, the attacker synchronizes with a legitimate user Sending a specific pilot signal can interfere with the pilot sharing mechanism between legal transceiver pairs, further affecting channel estimation, and paralyzing the next data transmission service of the system

Moreover, once a pilot-aware attack is successfully implemented, it is difficult for a legitimate transceiver to initiate data recovery

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