Research Article
Cognitive Wireless Networks Based Spectrum Sensing Strategies: A Comparative Analysis
Table 2
Performance comparison of narrow band spectrum sensing models.
| Sensing strategy | Approach | Merits | Demerits |
| Energy detector [19–23] | Sensing | Does not really necessitate understanding of the principal system and is incoherent | Noise- and uncertainty-prone |
| Matched filter [24–26] | Sensing | Less time needed to achieve high processing gain | Computational complexity depends on the primary network |
| Feature detection [27–32] | Sensing | Fast sensing as compared to energy detection | Higher accuracy requires a longer length of known sequences that results in lower efficiency of the spectrum |
| Receiver statistics [33–35] | Monitor | Monitoring during reception | Sensitive to receiver impairments |
| Energy ratio [36, 37] | Monitor | Insensitive to receiver impalements | May require long monitoring cycle |
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