Recently, I focus on UAV-enabled air-to-air wireless communications, in which the UAVs are flying at an altitude of 60~150 m. In this case, which channel model is more applicable? Intuitively, I think the LoS channel is suitable since there should be no obstacles at this high altitude. Is my idea correct? Could you provide me with some references, thank you very much for your help!
Relates to wavelength and antenna pattern.
In lower frequency bands (lower than 20 GHz), and for antenna patterns with a higher beamwidth you must consider interference and multi-path fading.
Dear Jiahui Li,
Greetings!
UAV's usually explores high frequency for communication. LOS model may work. You can refer the following link for details:-
https://ieeexplore.ieee.org/document/8740234
Dear Jiahui Li ,
If there is no obstacles in the path between the transmitter and the receiver and the medium is air then then the channel is for sure a line of sight.
If there is reflection from the ground to the receiver then there will be multi path effect. In this case one would model the channel by Rician model.
Both model are treated intensively in the literature. I think by skilled antenna directing to the UAV one can reduce the reception of the reflected radiation from the ground.
Best wishes
The answer is yes since there is almost no obstacle. Many research efforts also suggest using free-space optical for UAV communications, but many issues still need to be fixed like, TX/RX alignement, stability, etc.