Physical Layer Authentication Based on Full Channel Information under Dual-polarized Antenna Communication Systems

In this paper, we propose a physical authentication scheme based on the full channel information (FCI) in dual-polarized antenna communication systems. Different from channel impulse response (CIR) and channel frequency response (CFR), which only characterize the spatial fading of the channel, FCI reflects the spatial fading and polarization fading of channel, and completely characterizes the channel. Specifically, we use the least square (LS) to estimate channel spatial fading and polarization fading separately. Then based on statistical signal processing and binary hypothesis model, we establish an authen-tication scheme based on FCI and theoretically deduce the false alarm probability, detection probability, and optimal threshold of the proposed scheme. Besides, we conduct numerous simulation analysis on the proposed scheme. The simulation results show that the proposed scheme has higher authentication accuracy than that of CFR based schemes, especially in the case of low SNR.