[Paper] Capacity Analysis of In-Band Full-Duplex Amplify-and-Forward UAV Relaying for MIMO Wireless Link with Inter-Relay Interferences

Hover-in-place unmanned aerial vehicles (UAVs), which are used frequently as filming equipment in media production, also have potential use cases as hovering relay stations for microwave and millimeter-wave wireless links. For efficient frequency usage, it is desirable to utilize in-band full-duplex relays. In addition, to reduce the processing load of a UAV relay station, amplify-and-forward relays are desirable. In this case, it would be difficult to take countermeasures using signal processing if there is mutual interference between multiple nearby UAV relay stations. Therefore, we evaluated how much interference should be suppressed to avoid degradation in the average channel capacity. The results enabled us to quantitatively determine the required interference suppression for dual-polarized MIMO.