Pilot attack-oriented secure transmission method in low-precision large-scale antenna system

Abstract

The invention discloses a pilot attack-oriented secure transmission method in a low-precision large-scale antenna system. The method comprises the steps of 1) obtaining a channel estimation result ofa base station equipped with a low-precision ADC under the threat of a pilot attack based on an additive quantization noise model; 2) designing downlink transmission precoding and artificial noise based on the channel estimation value, and obtaining a transmitting signal quantized by the low-precision DAC based on the additive quantization noise model; and 3) obtaining a useful signal and artificial noise power distribution scheme capable of maximizing the safe transmission rate by analyzing the safe transmission rate when the number of antennas tends to be infinite. According to the method, the influence of pilot attacks, low-precision ADCs and low-precision DACs on the secure transmission of a large-scale antenna system is comprehensively considered, and the secure transmission rate maximization under different quantization precision is realized through power distribution.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a safe transmission method in the face of pilot attacks in a low-precision large-scale antenna system. Background technique [0002] Large-scale antennas are a key technology in 5G networks. Thanks to the array gain and high spatial reusability brought by dozens to hundreds of antennas, the system capacity can be greatly improved. However, if the radio frequency circuits corresponding to each antenna are equipped with high-precision analog-to-digital converters (ADC) and high-precision digital-to-analog converters (DAC), the cost and energy consumption of the entire system will be very high, seriously affecting large-scale Pervasiveness of antenna technology. Therefore, this paper considers a large-scale antenna communication system equipped with low-precision ADCs and DACs. In addition, reverse channel estimation is also a commonly used channel estim...

AI Technical Summary

Problems solved by technology

However, the major security threat faced by this channel estimation method is the pilot spoofing attack, that is, the eavesdropper pollutes the legal user channel estimated by the base station by sending the same pilot frequency as the legitimate user, and induces the downlink beam to be biased towards the eavesdropper.

So far, many works have studied the security performance of large-scale antenna systems equipped with low-precision ADCs and DACs, and the security performance of large-scale antenna systems under pilot spoofing attacks, but there are few studies on the impact of low-precision ADCs and DACs on pilot Research on the influence of system security performance under frequent spoofing attack

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