Analysis of Physical Layer Security Based on Correlated Channels in Opportunistic Beamforming Technology

Physical layer security technology is a wireless security technology that does not rely on traditional cryptography and relies on computational complexity. The opportunistic beamforming technology is to make use of the difference caused by channel fluctuation, reasonably precoding, and other means to obtain the maximum system capacity. The purpose of this paper is to explore the security rate of correlated channels in opportunistic beamforming. By constructing a multi-user related channel model, beamforming technology is used to seek the maximum signal-to-interference-noise ratio of legitimate users and illegitimate users, thereby obtaining the security and privacy rate of the related channel model. The simulation results show that if there is a correlation channel, the positive secure transmission rate can be obtained as long as the difference exists, and it decreases with the increase of correlation.