Open AccessField‐Measurement‐Based Received Power Analysis for Directional Beamforming Millimeter‐Wave Systems: Effects of Beamwidth and Beam Misalignment
Author(s) -
Lee Juyul,
Kim MyungDon,
Park JaeJoon,
Chong Young Jun
Publication year - 2018
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.2017-0188
Subject(s) - beamwidth , beamforming , extremely high frequency , beam (structure) , power (physics) , acoustics , field (mathematics) , physics , electrical engineering , engineering , electronic engineering , optics , antenna (radio) , mathematics , quantum mechanics , pure mathematics
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 GH z, 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.