Noncoherent Detection of Misbehaving Relays in Decode-and-Forward Cooperative Networks

This letter considers a three-node cooperative network with an untrusted relay. We propose a noncoherent relay misbehavior detection scheme for decode-and-forward (DF) systems based on the correlation among channel estimates at the destination under quasistatic channels. The proposed scheme does not require instantaneous channel state information and can detect arbitrary misbehavior patterns and various signal constellations. An asymptotic analysis of the proposed correlation-based detection statistic is conducted to facilitate characterizing the detection performance given a specific misbehaving pattern and customizing the detector to meet a specified system requirement. Simulation results validate the analysis and demonstrate improved performance of the proposed scheme in various relay misbehaving scenarios.