Table 4.

Comparative of channel models in literature.

Ref.	Type	Channel	Frequency (GHz)
[16]	Theoretical	UAV–Ground	2.4
[54]	Theoretical	UAV–Ground	2–6
[55]	Empirical	UAV–Ground	1.8–5.76
[56]	Empirical	UAV–Ground	0.8
[57]	Empirical	UAV–Ground	0.96–0.977
			5.030–5.091
[58]	Empirical	UAV–Ground	3.1–5.3
[59]	Semi-Empirical	UAV–Ground	2
[13]	Semi-Empirical	UAV–UAV	2.4