Decode-and-Forward Relay Beamforming for Secrecy With Imperfect CSI and Multiple Eavesdroppers
Wireless transmissions, by their very nature, are vulnerable to eavesdropping. There has been considerable interest in the use of physical layer mechanisms to provide secure communications, whereby the eavesdropper gets no information while the intended receiver gets the information reliably. Wyner's work on secrecy capacity of discrete memoryless wiretap channels and subsequent works, have created interest in the information-theoretic aspects of physical layer security. Secrecy capacity results for point-to-point fading channels have been widely reported, with several works assuming perfect knowledge of Channel State Information (CSI); SISO, SIMO, MISO, and MIMO.