Wireless Transmission System for the Improved Reliability in the Flying Ad-hoc Network

Abstract

Unmanned aerial vehicle (UAV) has unlimited availability not only in war but in various fields such as reconnaissance, observation, exploration. The wireless communication system between UAVs is very important and is known as flying ad-hoc network (FANET). The reason is that the FANET for UAV transfers data such as the information on mission accomplishment, collision prevention, etc. Therefore, the FANETs require the robust and spectral efficient communication scheme in the fading channel. Due to the high-mobility of the UAVs, these channels are very dynamic and time varying channel. In a dynamic channel environment, the adaptive modulation and coding (AMC) scheme is necessary to provide a reliable communication. This paper provides the improved wireless communication scheme applied with the AMC scheme. The proposed scheme uses the modulation and coding according to the channel state information (CSI) in the FANETs. The receiver obtains the CSI by using the channel estimation and transmits the feedback information to the transmitter. And then, the transmitter confirms the channel conditions via the CSI and adaptively uses the modulation scheme and code rate according to the channel conditions. Because the proposed scheme provides the reliable wireless communication, it does not require unnecessary re-transmission.

Non-Terrestrial Networks with UAVs:A Projection on Flying Ad-Hoc Networks

“…Conventional feedback-based LTE retransmission techniques like automatic repeat request (ARQ) or hybrid ARQ (HARQ) might not be efficient in FANET since the channel conditions are mostly hostile and poor due to rapid variations in the network topology [173]. Indeed, these techniques are applicable when the channel variation is slow [174].…”