본 논문에서는 밀리미터파 5G 이동통신 시스템의 일환으로 한국전자통신연구원이 개발중인 Giga KOREA 5G 의 물리계층 모뎀의 구조에 대하여 설명한다. Giga KOREA 5G 기술은 셀 당 최대 100 Gbps급 용량을 가진 기지국으로 개인별 1Gbps급 모바일 서비스를 제공하기 위해 밀리미터파 (10~40 GHz) 기반의 광대역 이동통신의원천기술 및 시제품을 개발하는 것을 목표로 하고 있으며, 이러한 요구조건을 충족하기 위해 물리계층은 고속 대용량 기지국 및 단말 플랫폼과 이에 탑재되는 OFDM TDD 방식의 고성능 모뎀으로 구현되었다. Giga KOREA 5G 모뎀의 주요 기능으로는 주파수 집성 및 단말의 수신 빔 탐색, 대용량 데이터 송수신을 위한 고속의 채널 부호화 및 복호화, 고속 변복조 기능 등이 있다.
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