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NTIS 바로가기한국항행학회논문지 = Journal of advanced navigation technology, v.23 no.5, 2019년, pp.437 - 443
강태원 (연세대학교 글로벌융합공학부) , 이하림 (연세대학교 글로벌융합공학부) , 서지원 (연세대학교 글로벌융합공학부)
In this paper, a new algorithm for the calculation of the range between an LTE base station (BS) and a user equipment (UE) using time-of-arrival (TOA) measurements of LTE signals is proposed. First, the cell identity (cell ID) of the received signal is acquired using the primary synchronization sign...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
수신된 LTE 신호에 대해 시간 영역에서 PSS나 SSS의 시퀀스를 상호 상관 (cross-correlation)을 통해 찾아내고 시간 지연을 계산하여 의사 거리 (pseudorange)를 도출해는 방법의 문제점은? | 수신된 LTE 신호에 대해 시간 영역에서 PSS나 SSS의 시퀀스를 상호 상관 (cross-correlation)을 통해 찾아내고 시간 지연을 계산하여 의사 거리 (pseudorange)를 도출해 낼 수 있다[18]-[19]. 그러나 이 방법은 GPS와 유사하게 다중 경로(multipath)에 취약하다는 단점이 있다[20]. 위 단점을 해결하기 위해 세 번째 기준 시퀀스인 CRS (cell-specific reference signal)을 사용할 수 있다. | |
LTE란? | LTE (long-term evolution) 는 4세대 무선 통신 시스템의 기준으로 최근 측위에 사용할 수 있는 기회 신호 중 하나로 크게 주목받는 신호이다. LTE 신호의 높은 정보 전송률, 전파 대역폭 및 커버리지는 측위에 적합한 장점으로 여겨지고 있다[16]. | |
UE는 수신된 LTE 신호의 프레임 시작 시각을 추정하기 위해 무엇을 이용하는가? | UE는 수신된 LTE 신호의 프레임 시작 시각을 추정하기 위해 매 프레임의 특정 시간에 삽입된 PSS와 SSS 두 동기화 신호를 이용한다. PSS는 Zadoff-Chu 시퀀스 기반의 기준 시퀀스로 슬롯 0과 10의 마지막 심볼에 담겨 전송된다. |
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