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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.

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 correlationbased 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.Index Terms-Cooperative networks, decode-and-forward, relay misbehavior detection, noncoherent communication.1089-7798 (c)

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