Robust Beamforming Design: From Cognitive Radio MISO Channels to Secrecy MISO Channels

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Executive Summary

This paper studies the robust beam-forming design problem for a Multiple-Input Single-Output (MISO) secrecy channel with a single-antenna eavesdropper. Due to the illegal nature, the eavesdropper may try to hide itself from being caught; thus, it could be difficult for the Secrecy Transmitter (S-Tx) to obtain accurate Channel State Information (CSI) of the eavesdropping link between S-Tx and the eavesdropper. Assuming that the CSI of the eavesdropping link belongs to a known uncertain set, this paper designs the optimal transmit strategy for the secrecy user to maximize the transmit rate under the condition that the eavesdropper cannot decode the secrecy message for all possible channel realizations of the eavesdropping link.

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