A Scrambling Scheme Based on Random Wireless Channel Characteristics for Secure Transmission

Due to the limited reciprocity of wireless channel, most existing physical-layer security method based on channel characteristics is implemented by repeatedly interacting to generate consistent keys, which resulting in large overhead. This paper proposes a secure transmission scheme based on equivalent channel which is built by random scrambling codes generated from channel characteristics. To improve efficiency and reliability, the legitimate senders scramble the encoded signal and the receivers mitigate the non-reciprocal effect by channel decoding, rather than interacting information to obtain consistent scrambling codes. The channel capacity and security capacity of the scheme are analyzed and simulated in Rayleigh channel model. The results show that the difference of channel characteristics significantly degrade the eavesdropper’s receiving performance, so that the received signal cannot be decoded correctly.