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Keywords = Ricean K-factor

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14 pages, 910 KB  
Article
A Passive Channel Measurement and Analysis Based on a 5G Commercial Network in V2I Communications
by Chen Chen, Dan Fei, Peng Zheng and Bo Ai
Electronics 2023, 12(17), 3715; https://doi.org/10.3390/electronics12173715 - 2 Sep 2023
Cited by 3 | Viewed by 2182
Abstract
To acquire accurate channel characteristics for 5G New Radio (NR) vehicle-to-infrastructure (V2I) communications, in this paper, we propose a 5G passive channel measurement platform based on software defined radio devices and 5G user equipment. Different from active measurement platforms, the proposed measurement platform [...] Read more.
To acquire accurate channel characteristics for 5G New Radio (NR) vehicle-to-infrastructure (V2I) communications, in this paper, we propose a 5G passive channel measurement platform based on software defined radio devices and 5G user equipment. Different from active measurement platforms, the proposed measurement platform only requires a receiver and the channel state information reference signal (CSI-RS) periodically transmitted by the 5G commercial base stations is used as the measurement waveform. The channel impulse response can be computed based on the CSI-RS signal extracted from the received waveform and the standard CSI-RS signal generated according to the signaling information. By using the proposed 5G passive channel measurement platform, we carry out wireless channel measurement for V2I communications in typical urban scenarios. Further, based on the measurement, the small-scale channel fading characteristics including the power delay profile, the number of multipaths, the delay spread of multipaths, and the Ricean K-factor are analyzed. Full article
(This article belongs to the Special Issue Channel Measurement, Modeling and Simulation of 6G)
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17 pages, 2887 KB  
Article
Propagation Characteristics Comparisons between mmWave and Visible Light Bands in the Conference Scenario
by Baobao Liu, Pan Tang, Jianhua Zhang, Yue Yin, Guangyi Liu and Liang Xia
Photonics 2022, 9(4), 228; https://doi.org/10.3390/photonics9040228 - 1 Apr 2022
Cited by 11 | Viewed by 3298
Abstract
Millimeter-wave (mmWave) communications and visible light communications (VLC) are proposed to form hybrid mmWave/VLC systems. Furthermore, channel modeling is the foundation of system design and optimization. In this paper, we compare the propagation characteristics, including path loss, root mean square (RMS) delay spread [...] Read more.
Millimeter-wave (mmWave) communications and visible light communications (VLC) are proposed to form hybrid mmWave/VLC systems. Furthermore, channel modeling is the foundation of system design and optimization. In this paper, we compare the propagation characteristics, including path loss, root mean square (RMS) delay spread (DS), K-factor, and cluster characteristics, between mmWave and VLC bands based on a measurement campaign and ray tracing simulation in a conference room. We find that the optical path loss (OPL) of VLC channels is highly dependent on the physical size of the photodetectors (PDs). Therefore, an OPL model is further proposed as a function of the distance and size of PDs. We also find that VLC channels suffer faster decay than mmWave channels. Moreover, the smaller RMS DS in VLC bands shows a weaker delay dispersion than mmWave channels. The results of K-factor indicate that line-of-sight (LOS) components mainly account for more power for mmWave in LOS scenarios. However, non-LOS (NLOS) components can be stronger for VLC at a large distance. Furthermore, the K-Power-Means algorithm is used to perform clustering. The fitting cluster number is 5 and 6 for mmWave and VLC channels, respectively. The clustering results reveal the temporal sparsity in mmWave bands and show that VLC channels have a large angular spread. Full article
(This article belongs to the Special Issue Visible Light Communication (VLC))
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