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NTIS 바로가기電子工學會誌 = The journal of Korea Institute of Electronics Engineers, v.42 no.10 = no.377, 2015년, pp.16 - 34
초록이 없습니다.
핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
mass ive MIMO의 장점은 무엇인가? | 좀 더 자세히 말하면, 최소평균제곱오차 (minimum mean square error; MMSE), zero-forcing (ZF), MRT 빔포머들과 같은 선형 빔포머를 사용해도 각 사용자의 신호대간섭더하기잡음비 (signal-to-interference -plusnoise ratio; SINR)가 안테나의 수 Nt에 선형적으로 증가함이 알려져 있다[3]. 또한, 전체 전송 용량이 기지국의 안테나의 수에 로그적으로 증가하고, 사용자의 수에 따라 선형적으로 증가함이 알려져 있고, 일정한 SINR을 유지하는데 기지국의 송신 전력을 안테나의 수에 반비례하여 줄일 수 있다는 것이 알려져 있다[3]. | |
massive MIMO 기술이란 무엇인가? | 5G 이동 통신 시스템의 구체적인 설계 목표는 현재에도 새롭게 정의되고 진화하고 있지만, 가장 기본적인 5G 이동 통신 시스템의 성능 목표 요구량은 1) 면적당 데이터 율 1000배 증가, 2) 사용자당 데이터 율 10~100배 증가, 3) 면적당 연결된 디바이스 10~100배 증가, 4) 에너지 효율 1000배 증대이다[1]. 이러한 요구를 맞추기 위하여 개발되고 있는 여러 기술들 중 하나인 massive MIMO (multiple input multiple output) 기술은 다수의 안테나를 사용하여 적절한 빔형성을 통해 사용자간 간섭을 공간적으로 제거하고 송신 에너지를 최소화하는 동시에 다수의 단말기를 지원하는 기술로, 5G 이동 통신을 위한 핵심 기술로 자리매김하고 있다[2]. 하지만, massive MIMO의 장점을 얻는데 채널 추정 문제, 하드웨어 복잡도 증가 및 장애 등과 같은 여러가지 현실적인 문제점들이 있고 이를 해결하기 위해 많은 연구들이 진행되고 있다. | |
5G 이동 통신 시스템의 성능 목표 요구량은 무엇인가? | ”)라는 슬로건을 내걸고 5G 이동통신 시스템 개발을 주도하고, 4G 대비 높은 요구량을 실현시키는 것을 목표로 하고 있다[1]. 5G 이동 통신 시스템의 구체적인 설계 목표는 현재에도 새롭게 정의되고 진화하고 있지만, 가장 기본적인 5G 이동 통신 시스템의 성능 목표 요구량은 1) 면적당 데이터 율 1000배 증가, 2) 사용자당 데이터 율 10~100배 증가, 3) 면적당 연결된 디바이스 10~100배 증가, 4) 에너지 효율 1000배 증대이다[1]. 이러한 요구를 맞추기 위하여 개발되고 있는 여러 기술들 중 하나인 massive MIMO (multiple input multiple output) 기술은 다수의 안테나를 사용하여 적절한 빔형성을 통해 사용자간 간섭을 공간적으로 제거하고 송신 에너지를 최소화하는 동시에 다수의 단말기를 지원하는 기술로, 5G 이동 통신을 위한 핵심 기술로 자리매김하고 있다[2]. |
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