Physical Layer Secured Polar Codes with Optimal Jamming Position

摘要

In this paper, we consider a secure communication over the physical layer. The objective of the system is, at the physical layer security, the randomness of the channel and the polar coded aided artificial noise provide the security to the system without any secret key generation in higher layer encryption. Artificial noise will be injected at the last codeword of the confidential bits of polar codes in transmission block. Jamming position algorithm is used to initialize the position of artificial noise. The Bhattacharya parameter is used to select the position of jamming with regard to the reliability of the channel. The legitimate receiver has the knowledge of artificial noise and the confidential bit position, so it will eliminate the AN but Eve does not have the knowledge of jamming position so it cannot eliminate the AN. Simulation results show the performance of secrecy rate and the security gap of the system with the help of adding artificial noise at the last transmission block.