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Terrain types and corresponding channel models.
| Terrain type | Characteristics | Channel models |
|---|---|---|
| AWGN | Additive white Gaussian noise, idealized channel with no fading or interference | AWGN |
| Terrain C | Flat regions with light tree density, minimal obstruction effects | SUI-1, SUI-2 |
| Terrain B | Flat or moderately dense tree coverage | SUI-3, SUI-4 |
| Terrain A | Hilly areas with moderate to heavy tree density | SUI-5, SUI-6 |
