Misbehavior Detection Without Channel Information in Cooperative Networks

In this work, we consider a canonical three-node DF cooperative network where the relay may misbehave with a certain probability. Without misbehavior detection, diversity combining at the destination may degrade system performance severely if the relay misbehaves. Most existing work of misbehavior detections requires perfect channel state information (CSI), which may not be achievable since the retransmitted symbols are garbled by the malicious relays. With this regard, we propose a two-tier approach to detect misbehaving relay in quasi-static relay channel. By measuring the average received energy and observing the distribution of the phase rotations of the tracing symbols, misbehavior of the relay can be determined without CSI. As shown in simulations, error performance of the proposed scheme is close to the case with perfect misbehavior detection.