1 research outputs found
Decode-and-Forward Relay Beamforming with Secret and Non-Secret Messages
In this paper, we study beamforming in decode-and-forward (DF) relaying using
multiple relays, where the source node sends a secret message as well as a
non-secret message to the destination node in the presence of multiple
non-colluding eavesdroppers. The non-secret message is transmitted at a fixed
rate and requires no protection from the eavesdroppers, whereas the
secret message needs to be protected from the eavesdroppers. The source and
relays operate under a total power constraint. We find the optimum source
powers and weights of the relays for both secret and non-secret messages which
maximize the worst case secrecy rate for the secret message as well as meet the
information rate constraint for the non-secret message. We solve this
problem for the cases when () perfect channel state information (CSI) of all
links is known, and () only the statistical CSI of the eavesdroppers links
and perfect CSI of other links are known