Physical Layer Secure Transmission Scheme with Joint Polar Codes and Non-reconciliation Secret Keys

The existing key generation scheme requires additional key reconciliation protocol in a communication process, resulting in the limited application to the communication system, such as the Fifth-Generation mobile communication (5G). A physical layer secure transmission scheme with a joint polar code and non-reconciliation secret keys is proposed. Firstly, the non-reconciliation physical layer keys are extracted from the channel feature, and then the polar code is designed based on the equivalent channel, which is formed by the physical channel and the key encryption channel. Finally, the encoded sequence is simply modular plus encrypted and transmitted using the non-reconciliation physical layer key. Key differences and noise-induced bit errors are corrected through a targeted design of polarization codes to achieve reliable and secure transmission. The simulation shows that the polar code based on the equivalent channel can ensure the reliable transmission between two legitimate users at the optimal code rate.