조정현 백호기 임재성 2023-12 2671-4744 https://aurora.ajou.ac.kr/handle/2018.oak/37718 https://www.kci.go.kr/kciportal/ci/sereArticleSearch/ciSereArtiView.kci?sereArticleSearchBean.artiId=ART003030638 In a cellular system, the base station is responsible only for cell coverage within a certain range and transmits data. However, transmitting data to users outside cell coverage is difficult. In addition, even if the cell user is within that range, there may be cases in which data are not properly transmitted owing to poor communication conditions. Therefore, the user QoS must be satisfied by relaying the data transmitted from the base station. Therefore, in this study, we propose a technology for relay transmission to users with poor communication conditions based on half-duplex cooperative NOMA using terrestrial amplification relays according to the user's location relationship and communication range of the base station and relay. Through numerical performance analyses of the ergodic channel capacity and outage probability, it was confirmed that compared to existing techniques, the proposed technique cannot only improve communication quality for users with poor communication conditions, but also expand the communication range for remote users. Kor 국방기술품질원 셀룰러 시스템에서 AF 중계기를 이용한 반이중 협력 NOMA 릴레이 기법 Half-Duplex Cooperation NOMA Relay Technique using an AF Repeater in Cellular Systems Article 79 2 72 국방품질연구논집(JDQS) 5 국방품질연구논집(JDQS), Vol.5 No.2, pp.72-79 10.23199/jdqs.2023.5.2.008 Half-Duplex Cooperation NOMA Amplify-Forward(AF) Relay Transmission Article