무선 통신 환경에서 대역 내 전이중 통신 시스템은 고갈되어가는 스펙트럼의 좋은 해결책 중 하나가 될 수 있다. 본 논문에서는 다중안테나 환경에서 전이중 통신을 위해 반드시 해결해야하는 자기간섭 신호의 제거에 적합한시스템 구성을 제안하였다. 특히, 자기간섭 신호에 포함된 다중 안테나 간 간섭, IQ 불일치, PA 비선형 발생 등으로 인한 자기간섭 제거 복잡도 증가 문제를 해결하기 위해 편파 안테나를 통해 RF SIC(Self-Interference Cancellation) 블록을 단순화하고, 보조 송신단을 통한 SIC 및 중간 주파수 사용 등을 통해 디지털 자기간섭 제거복잡도를 낮추었으며, 채널 변화에 빠르게 대응하도록 하드웨어로 구현하였다. 구현된 플랫폼을 통해 실시간으로자기간섭 신호를 90dB이상 제거해 잔존 자기 간섭을 잡음 수준까지 낮추었으며, 수신신호 품질을 성상도로 확인하였다.
KSP Keywords
Self-Interference Cancellation
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