Achievable Rate Region for Wireless Multiple Access Channels with UAV Relay and k Independent Transmitters

Nobakht, Padideh; Aminian Modarres, Amir Masoud; Hodtani, Ghosheh Abed

doi:10.22060/eej.2026.23943.5643

Achievable Rate Region for Wireless Multiple Access Channels with UAV Relay and k Independent Transmitters

Document Type : Research Article

Authors

Padideh Nobakht ¹

Amir Masoud Aminian Modarres ¹

Ghosheh Abed Hodtani ²

¹ Dr, Department of Electrical Engineering, sadjad University, Mashhad, Iran

² Profssor, Department of Electrical Engineering, Ferdowsi University, Mashhad, Iran

10.22060/eej.2026.23943.5643

Abstract

This paper considers and characterizes a multiple access relay channel (MARC) with $k$ transmitters, one UAV relay, and a terrestrial receiver, where we derive a new achievable rate region for the continuous alphabet wireless with an unmanned aerial vehicle (UAV) relay. The derived rate region is then evaluated numerically and compared with those of multiple access channels (MAC) and MARC with terrestrial relays. The results show that the presence of a UAV relay increases the achievable rate region of MAC systems by exploiting higher line-of-sight (LoS) channel quality and time-varying spatial link gains due to the UAV’s position. This improvement in the achievable region is not merely due to the UAV’s presence but arises from the different channel geometry and dynamic link conditions introduced by the UAV relay compared with terrestrial relays.

Keywords

achievable rate region

multiple access relay channel

UAV

Subjects