Abstract
In this paper, we investigate the physical layer key generation scheme in most realistic scenarios where the correlation between the legitimate channel and the eavesdropping channel is considered. To degrade the correlation and improve the key generation capacity, a physical layer key generation scheme through scrambling the correlated eavesdropping channel is proposed. Firstly, the artificial noise is sent superimposed over pilots from the legitimate transmitter to confuse the eavesdropper. The artificial noise precoding matrix is randomly selected from decomposed unitary matrices orthogonal to the legitimate channel resulting in having no effect on legitimate channel. Then, the vector quantization algorithm and the winnow algorithm are respectively applied to quantize the channel characteristic and negotiate the generated random sequences to generate the final key. To further support the performance, we next present a power optimization scheme allocated to sending the artificial noise to maximize the generated key capacity under the total transmission power constraint. Finally, simulation results are presented to validate the effectiveness of our proposed scheme.
Highlights
Since the inherent openness of the transmission medium makes wireless information more vulnerable to being eavesdropped, secure communication is identified as a critical challenge facing wireless systems
The system key generation capacity and the eavesdropping key generation capacity versus signal-tonoise ratio (SNR) is demonstrated in Figure 3 under different correlation coefficients between the eavesdropping channel and the legitimate channel
As the correlation coefficient of the eavesdropping channel increases, the proposed scheme can significantly improve the key generation capacity. This is because when the correlation coefficient of the eavesdropping channel is lower, the eavesdropper can eavesdrop less information related to legitimate users
Summary
Since the inherent openness of the transmission medium makes wireless information more vulnerable to being eavesdropped, secure communication is identified as a critical challenge facing wireless systems. Y. Chen et al.: Physical Layer Key Generation Scheme Through Scrambling the Correlated Eavesdropping Channel features using public pilots, which is easy to obtain the estimated channel by the eavesdroppers located nearby the legitimate receiver. Based on Kronecker model, the expression of the generated key rate was derived under the condition of legitimate channel correlation, and the optimal result of antenna power distribution was obtained in [11]. The eavesdropper will obtain the very different estimated channel from the main channel between the legitimate users even if the eavesdropper locates nearby the legitimate receiver because of the artificial noise (AN) sent from the legitimate transmitter It will degrade the correlation of the estimated legitimate channel and the VOLUME 8, 2020 estimated eavesdropping channel to achieve higher key generation capacity.
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