Key generation method applied to multi-user large-scale MIMO system

Abstract

The invention discloses a key generation method applied to a multi-user large-scale MIMO (Multiple Input Multiple Output) system, which comprises the following steps: generating a key in a beam domain: firstly, respectively carrying out link detection on a base station and each user, and designing a precoding matrix and a receiving matrix according to a detection result; then the base station andeach user respectively using the precoding matrix and the receiving matrix to send pilot signals to each other, and respectively preprocessing the received signals and forming an initial secret key through channel estimation; and finally, obtaining a consistent random key between the base station and each user through information reconciliation and privacy amplification. According to the technicalscheme of the invention, when an existing single-user point-to-point secret key generation mode is applied to a multi-user large-scale MIMO communication system, the multi-user point-to-point secretkey can be generated. The problems of overlong pilot signal length and high pilot overhead caused by the increase of the number of antennas and the number of users are solved, meanwhile, the designedprecoding and receiving matrixes can realize the key rate maximization, and the safety of a communication system is ensured by a non-overlapping beam set.

Description

technical field [0001] The invention relates to encryption technology, in particular to a key generation method applied in a multi-user massive MIMO system. Background technique [0002] With the development of communication technology, wireless communication equipment has increased rapidly, and the demand for confidential communication between legal communication parties has gradually increased. The traditional security scheme is to encrypt data through public and private keys. However, private key encryption faces the problems of key management, distribution, and update. In order to save costs, key update is often very slow, which may cause serious security threats. In addition, the computational complexity of traditional public key encryption and decryption is too high, and the delay caused by it may not meet the ultra-low delay requirements of the fifth-generation wireless communication system. The emergence of quantum computers with powerful computing capabilities als...

AI Technical Summary

Problems solved by technology

If the key is serially generated between the base station and each user in a point-to-point manner, the overhead will increase linearly with the increase in the number of users, which seriously reduces the efficiency of key generation

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