SDR 기술은 다양한 무선통신 환경(다중모드, 다중표준, 다중대역, 다중기능)에 유연하게 대처하기 위하여 하나의 공통 하드웨어에 사용자가 원하는 응용 소프트웨어(무선 프로토콜 규격)로 재구성할 수 있는 개방형 신호처리 기술이다. 그러므로 SDR은 이러한 이동통신시장의 변화에 적극적으로 대처하기 위한 핵심기술로써, 통신시장이 직면하고 있는 문제점을 해결할 수 있는 해결책 중의 하나로 고려되고 있다. 본 고에서는 SCA 기반 SDR 단말기 구현을 위해, 통신 애플리케이션 소프트웨어를 지원하는 하부구조 관점에서 SCA Core Framework의 구조 및 기능을 기술하고, ETRI에서 SCA 2.2 규격을 준수하여 개발한 SCARLET 미들웨어 및 SDR 공용 단말 하드웨어를 소개하고, SCA 기반의 HSDPA/T-DMB 응용 컴포넌트 구현을 통한 실험 내용을 소개한다.
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