Lee, Juyul
(5G Giga Communication Research Laboratory, ETRI)
,
Liang, Jinyi
(5G Giga Communication Research Laboratory, ETRI)
,
Kim, Myung-Don
(5G Giga Communication Research Laboratory, ETRI)
,
Park, Jae-Joon
(5G Giga Communication Research Laboratory, ETRI)
,
Park, Bonghyuk
(5G Giga Communication Research Laboratory, ETRI)
,
Chung, Hyun Kyu
(5G Giga Communication Research Laboratory, ETRI)
This paper presents millimeter-wave (mmWave) propagation characteristics and channel model parameters including path loss, delay, and angular properties based on 28 GHz and 38 GHz field measurement data. We conducted measurement campaigns in both outdoor and indoor at the best potential hotspots. In...
This paper presents millimeter-wave (mmWave) propagation characteristics and channel model parameters including path loss, delay, and angular properties based on 28 GHz and 38 GHz field measurement data. We conducted measurement campaigns in both outdoor and indoor at the best potential hotspots. In particular, the model parameters are compared to sub-6 GHz parameters, and system design issues are considered for mmWave 5G Giga communications. For path loss modeling, we derived parameters for both the close-in free space model and the alpha-beta-gamma model. For multipath models, we extracted delay and angular dispersion characteristics including clustering results.
This paper presents millimeter-wave (mmWave) propagation characteristics and channel model parameters including path loss, delay, and angular properties based on 28 GHz and 38 GHz field measurement data. We conducted measurement campaigns in both outdoor and indoor at the best potential hotspots. In particular, the model parameters are compared to sub-6 GHz parameters, and system design issues are considered for mmWave 5G Giga communications. For path loss modeling, we derived parameters for both the close-in free space model and the alpha-beta-gamma model. For multipath models, we extracted delay and angular dispersion characteristics including clustering results.
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문제 정의
To facilitate successful system development in mmWave frequency bands that have yet to be explored for mobile cellular networks, the understanding of mmWave propagation characteristics is necessary not only for system design but also for verification and evaluation. In this study, we investigate mmWave propagation characteristics based on field measurement data used in the mmWave-based 5G cellular system of the GK-5G project. The field measurement data were collected in an urban microcellular (UMi) environment and two indoor hotspot (InH) areas at 28 GHz and 38 GHz: a downtownn area in Daejeon city was selected (for UMi) and the passenger terminals of Seoul Railway Station and Incheon International Airport were selected (for InH).
가설 설정
In this study, we consider these issues by investigating mmWave propagation characteristics and channel models, specifically targeting mobile cellular networks.
제안 방법
After several trial-and-error attempts and considering environmental structures, we set the maximum number of MPCs for SAGE to be 100 and 200 for LOS and NLOS, respectively, which effectively captures the most channel power.
Thus far, we have discussed path loss characteristics, which from the perspective of system design, can be translated into received power/SNR statistics. Along with this holistic view of received signal components, this section focuses on component-level analyses of received signals in time (delay) and spatial (angle) domains. The delay analysis will provide frequency selectivity information of mmWave channels along with system bandwidth and symbol duration period.
We contributed our UMi and InH measurement results to the white paper. Compared to the white paper contribution, this paper presents measurements and in-depth analysis including comparisons with sub-6GHz channel models that were not presented in the white paper. Furthermore, we will also discuss system design considerations with the obtained model parameters.
Our multipath results provide information on diversity gain and system parameters such as length of cyclic prefix, symbol duration, pilot design, and amount of feedback. Considering the recent announcement of ITU-R frequency spectra candidates, we conclude that our field measurements results will be useful for the determination of 5G Giga system parameter numerics.
Our approach involves fitting of our 28 GHz and 38 GHz measurement data to existing 3GPP/ITU-R channel models that have been successfully employed for 3G and 4G systems and were proven to be valid for frequencies below 6 GHz. We then compare the mmWave parameters extracted from our measurements with those of sub-6 GHz models and discuss the impacts on mmWave system designs. We use omnidirectional antenna measurements for large-scale propagation behaviors such as path loss, and directional antenna measurements for multipath component level analysis.
대상 데이터
As shown in Fig. 1, the sounder is composed of a baseband module (BBM), a transceiver module (TRXM), a timing module (TIM), a 28/38 GHz RF module (RFM), and antennas. The RFM and one antenna are installed on the 3D positioner (shown in the figure) to vary the boresight direction of antenna in 1° steps.
In this study, we investigate mmWave propagation characteristics based on field measurement data used in the mmWave-based 5G cellular system of the GK-5G project. The field measurement data were collected in an urban microcellular (UMi) environment and two indoor hotspot (InH) areas at 28 GHz and 38 GHz: a downtownn area in Daejeon city was selected (for UMi) and the passenger terminals of Seoul Railway Station and Incheon International Airport were selected (for InH).
2. The measurement site is a typical downtown area composed of rectangular street grids. The average building height is 20 m–35 m, and the average street width is 24 m–35 m.
이론/모형
In order to conduct outdoor and indoor field measurement campaigns, we designed and built a wideband channel sounder operating at 28 GHz and 38 GHz. This sounder was developed using the swept time-delay cross-correlation method with a sliding correlation technology [24]. Figure 1 shows the channel sounder, and Table 1 lists the sounder specifications.
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