Physical Layer Authentication Based on Continuous Channel Polarization Response in Low SNR scenes
Yuemei Wu, Dong Wei, Qiaoyu Zhang, Weiqing Huang, Meng Xiang · 2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) · 2022
In this paper, we propose a physical layer authentication scheme based on channel polarization response (CPR) in low SNR scenes, such as IoT, 5G, and 6G communication systems. We use the transmitting polarization state as the “pilot” to estimate CPR. Then, using the property that the polarization state of the signal is independent of the transmission content, the coherent superposition is used to stack the signal piecewise to improve the SNR. We derive the false alarm probability, detection probability, optimal threshold, and computational complexity of the proposed scheme, and give the solution method of the optimal stacking numbers under specific SNR and authentication performance. Besides, we analyze the effectiveness of the proposed scheme through numerical simulation. Simulation results show that the proposed scheme can still achieve good authentication performance under ultra low SNR, such as when SNR = -20dB, the detection probability is 99.6%, and the false alarm probability is 2%.