Secure Communication in Wiretap Channels with Partial and Statistical CSI at the Transmitter

One major challenge in physical layer security for confidential communication is the lack of channel state information at the transmitter about the channel to the passive eavesdropper. Depending on the attacker and channel assumptions, the statistical or deterministic channel uncertainty model is applied. The chapter reviews recent results for both uncertainty models and compares different signaling and pre-coding schemes and their achievable average and outage secrecy rates in fast and slow-fading wiretap channels. In addition to wiretap coding, artificial noise and non-Gaussian layered signaling are necessary to guarantee non-zero secrecy rates in scenarios where Gaussian wiretap codebooks do not work.

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