Noncoherent misbehavior detection in space-time coded cooperative networks

Consider a two-relay decode-and-forward (DF) cooperative network where Alamouti coding is adopted among relays to exploit spatial diversity. However, the spatial diversity gain is diminished with the existence of misbehaving relays. Most existing work on detecting malicious relays requires the knowledge of instantaneous channel status, which is usually unavailable if the relays garble retransmitted signals deliberately. With this regard, we propose a noncoherent misbehavior detection using the second-order statistics of channel estimates for relay-destination links. It shows from simulation results that increasing the number of received blocks provides significant improvement even at low SNR regime.