Table 1.
Brief comparison of RFF feature extraction methods
Methods | Prior information requirement | Challenges |
---|---|---|
I/Q signal-based | Low (raw I/Q) Median (RF-DNA)a High (the others) | Low identification accuracy. (RF-DNA) Strict demands on classifier design and the possibility of overfitting. (I/Q sample) |
Parameter-based | High | Dependence on manually selected features and accurate estimation |
Transformation-based | Medianb | Dependence on expert knowledge |
Note: (a)Requires the information of signal protocol. (b)Sometimes the prior information is required for signal preprocessing.
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