Exploiting Partial Channel State Information for Secrecy Over Wireless Channels
In this paper, the authors investigate the effect of partial channel state information on the achievable secure communication rates and secret-key generation rates over ergodic fading channels. In particular, they establish lower bounds for the strong secrecy capacity and the strong secret-key capacity of ergodic and block-ergodic fading channels with partial Channel State Information at the Transmitter (CSIT). Their analysis sheds light on the usefulness of CSIT to harness the benefits of fading for secrecy and allows the user to quantify the penalty incurred by lack of full CSIT. In particular, they illustrate numerically situations in which little CSIT is required to recover most of the benefits of fading and in which the legitimate terminals have an incentive to characterize their channel precisely.