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학술지 Field-Measurement-Based Received Power Analysis for Directional Beamforming Millimeter-Wave Systems: Effects of Beamwidth and Beam Misalignment
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저자
이주열, 김명돈, 박재준, 정영준
발행일
201802
출처
ETRI Journal, v.40 no.1, pp.26-38
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.2017-0188
협약과제
17HR2300, 선제적 주파수 이용을 위한 시·공간적 스펙트럼 엔지니어링 기술 개발, 정영준
초록
To overcome considerable path loss in millimeter-wave propagation, high-gain directional beamforming is considered to be a key enabling technology for outdoor 5G mobile networks. Associated with beamforming, this paper investigates propagation power loss characteristics in two aspects. The first is beamwidth effects. Owing to the multipath receiving nature of mobile environments, it is expected that a narrower beamwidth antenna will capture fewer multipath signals, while increasing directivity gain. If we normalize the directivity gain, this narrow-beamwidth reception incurs an additional power loss compared to omnidirectional-antenna power reception. With measurement data collected in an urban area at 28 GHz and 38 GHz, we illustrate the amount of these additional propagation losses as a function of the half-power beamwidth. Secondly, we investigate power losses due to steering beam misalignment, as well as the measurement data. The results show that a small angle misalignment can cause a large power loss. Considering that most standard documents provide omnidirectional antenna path loss characteristics, these results are expected to contribute to mmWave mobile system designs.
키워드
Beamforming, Channel measurements, Channel model, Millimeter wave, Multipath characteristics, Path loss
KSP 제안 키워드
28 GHz, 38 GHz, 5G mobile network, Beam misalignment, Channel measurement, Data collected, Enabling technologies, Half power beamwidth, Mobile system, Omnidirectional Antenna, Path loss characteristics
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