인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
개인구독
소속 기관이 없으신 경우, 개인 정기구독을 하시면 저렴하게
논문을 무제한 열람 이용할 수 있어요.
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 저자정보
초록·키워드
In this paper we investigated channel estimation schemes for MC-CDMA system in downlink multipath channel. A pilot-channel assisted channel estimation scheme and a pilot-subcarrier assisted one have been considered and MRC, EGC and ORC have been used for a combining method. Each channel estimation scheme has some merits and disadvantages, therefore a proper channel estimation scheme should be selected for a specific application environment. er conveys a low rate, that is, narrow band signal which experiences flat fading channel. If such subcarriers distribute over frequency range exceeding coherence bandwidth, that is, fading channel is frequency selective, not all of the subcarriers are located in a deep fade in frequency and consequently achieve frequency diversity. In single carrier DS-CDMA (direct sequence code division multiple access) systems, we could take advantage of multi-path propagation by using RAKE receiver which is capable of resolving each path. But in MC-CDMA systems utilization of multi-path propagation can be achieved by channel equalization in frequency domain, which is able to be implemented easily by one-tap multiplier at each subcarrier. In order to apply proper channel equalization, exact channel estimation is necessary. In this paper, we consider two types of channel estimation scheme, which are a pilot-channel assisted method and a pilot-subcarrier assisted one, and investigate their performance in downlink multipath channel.
본문·목차
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
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최근 본 자료 전체보기
UCI(KEPA) : I410-ECN-0101-2014-569-001016229