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학술대회 Beamwidth-Dependent Directional Propagation Loss Analysis based on 28 and 38 GHz Urban Micro-Cellular (UMi) Measurements
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이주열, 양금위, 박재준, 김명돈
Vehicular Technology Conference (VTC) 2017 (Fall), pp.1-5
17HR2300, 선제적 주파수 이용을 위한 시·공간적 스펙트럼 엔지니어링 기술 개발, 정영준
Associated with millimeter-wave (mmWave) 5G, high-gain directional beamforming is being considered as a key technology for overcoming considerable propagation loss. When there is a single dominant propagation path between a transmitter and a receiver, this high-gain directional beamforming will be effective. However, when a receiver receives signals from various directions, as is typical in (multipath-rich) mobile environments, increasing directivity gain (by narrowing the beamwidth) at specific directions may block multipath signals from other directions due to the narrowed beamwidth. This will decrease the overall signal power reception. In this paper, we investigate beamwidthdependent directional propagation loss behaviors based on 28 and 38 GHz measurements. The measurement data were collected in a typical urban micro-cellular environment where many objects and surrounding buildings compose multipathrich propagation environments. To save measurement time and efforts, we conducted the measurements with a narrow 10 째 HPBW (half power beamwidth) antenna and then synthesized other beamwidth characteristics. Our results show that there is an inversely proportional relationship between the beamwidth and the power loss compared to the omnidirectional antenna reception. Although we analyzed with limited data only at 28 and 38 GHz, we believe that these characteristics will be helpful in developing mmWave 5G systems.
KSP 제안 키워드
38 GHz, 5G system, Half power beamwidth, Key technology, Limited data, Loss Analysis, Omnidirectional Antenna, Propagation loss, Urban micro, directional propagation, directivity gain(DG)