Attack detection method of large-scale MIMO system under pilot attack

Abstract

The invention discloses an attack detection method of a large-scale MIMO system under pilot attack. According to the invention, the pilot frequency is divided into two sections, and each section of pilot frequency can independently realize channel estimation. The transmitting power of the legal user is changed when the second section of pilot frequency is transmitted, and a test statistic quantityis constructed according to different proportions of a legal channel and an attack channel in the two-section channel estimation, wherein the test statistic quantity complies with normal distributionof different parameters under the conditions of pilot attack and no pilot attack, and pilot attack detection of the multi-cell large-scale MIMO system is realized through judgment of the statistics and a threshold value. In the method, the larger the number of antennas is, the higher the attack detection probability is; the larger the sample number of the training pilot frequency is, the higher the detection probability is.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an attack detection technology under pilot attack in a massive MIMO multi-cell system. Background technique [0002] With the development of massive MIMO technology, the physical layer security issues have been paid enough attention. The beamforming technology can design the precoding matrix according to the result of the channel estimation, so that the signal is sent in the direction of the legal user, which has better confidentiality. When an attacker appears in the system, the attacker generally uses the same pilot as the legitimate user, causing interference to the pilot of the legitimate user, which in turn affects the channel estimation, and finally makes the signal processed by the beamforming technology not completely towards the legitimate user. direction, making it easier for an attacker to eavesdrop on the information sent in the communication. Therefore, it i...

AI Technical Summary

Problems solved by technology

Especially in the case of multiple cells, the received signal of the base station will also be interfered by legal users from other cells. At this time, it is more difficult for the multi-cell system to distinguish the pilot signals from other cells and the Attacker's pilot signal

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