The Information Theoretic Approach to Signal Anomaly Detection for Cognitive Radio
Figure 17
Oscilloscope trace of a WiBro signal with multiple anomalous events and the associated trigger events. The KLD threshold is . Triggers A and B are caused by a momentary change in the signal period. Trigger C flags the presence of a very brief command sequence that leads to a signal power level change. Trigger D marks the position in the subsequent frame where the power change inducing command was previously present and finally, trigger E corresponds to a sudden change in the overall signal power level.
