To address the issue of extremely low achievable key rates caused by a strong correlation between the legitimate channel and the eavesdropping channel when an eavesdropper is very close to legitimate users,we propose a physical layer key generation method based on full-duplex(FD)interference suppression.Nodes perform channel estimation while legiti-mate users transmit interference to suppress eavesdroppers from stealing information.Subsequently,legitimate users conduct key agreement over a noiseless public channel to derive the key.Using the ergodicity property and Jensen's inequality,an analytical expression for the lower bound of the system's key capacity is derived.Simulation results show that a small a-mount of interference signal power can improve the system's achievable key rate significantly.Moreover,it is demonstrated that the full-duplex system with interference offers substantial performance improvements compared to the traditional half-duplex(HD)system without interference.
关键词
全双工/物理层安全/密钥生成/干扰
Key words
full duplex/physical layer security/key generation/interference
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