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학술대회 Directional Delay Spread Characteristics of Outdoor-to-Indoor Propagation Based on Millimeter-Wave Measurements
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이주열, 김경원, 김명돈, 박재준
European Conference on Antennas and Propagation (EuCAP) 2019, pp.1-5
19HR1100, 선제적 주파수 이용을 위한 시·공간적 스펙트럼 엔지니어링 기술 개발, 정영준
This paper empirically investigates the directional delay spread characteristics for outdoor-to-indoor (O2I) propagation environments. These directional characteristics are obtained by considering only a particular portion of multipath components (rather than considering all the omnidirectional multipath components) that are spatially filtered by a narrow-beamwidth antenna. In millimeter-wave systems, directional characteristics are useful when employing high-gain directional beamforming techniques. Based on 32 GHz O2I measurements conducted in two building sites, which were carefully selected to follow the ITU-R building classification, we extract directional delay dispersion characteristics as a function of changes in antenna beamwidth. Our analysis results show that the root-mean-square (r.m.s.) directional delay spread characteristics are dependent not only on building type but also on antenna beamwidth. Interestingly, the thermally efficient building exhibits more dispersive characteristics than the traditional building, which is due to a smaller peak multipath component (MPC). The r.m.s. delay spread increases as the antenna beamwidth increases, since a wider beamwidth antenna captures more MPCs. These characteristics will be useful for the determination of dynamic cyclic-prefix length in an OFDM-based system.
KSP 제안 키워드
Antenna Beamwidth, Beamforming technique, Building classification, Building type, Delay Dispersion, Delay spread, Dispersion characteristics, International telecommunications union radiocommunication(ITU-R), Millimeter-wave measurements, Outdoor-to-indoor Propagation, Root mean square(RMS)