A secure transmission method against pilot attacks in low-precision large-scale antenna systems

Abstract

The present invention discloses a secure transmission method in the face of pilot attack in a low-precision large-scale antenna system, including: 1) Obtaining the channel estimation result of a base station equipped with a low-precision ADC under the threat of pilot attack based on an additive quantization noise model ; 2) Design the downlink transmission precoding and artificial noise based on the channel estimation value, and obtain the transmitted signal quantized by the low-precision DAC based on the additive quantization noise model; 3) By analyzing the safe transmission rate when the number of antennas tends to infinity, we get A useful signal and artificial noise power allocation scheme that maximizes the safe transmission rate. The invention comprehensively considers the influence of pilot frequency attack, low-precision ADC and low-precision DAC on the safe transmission of large-scale antenna system, and realizes the maximization of safe transmission rate under different quantization precision 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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