Space-Frequency-Interpolated Radio Map

Sato, Koya; Suto, Katsuya; Inage, Kei; Adachi, Kôichi; Fujii, Takeo

doi:10.1109/tvt.2021.3049894

Cited by 37 publications

(16 citation statements)

References 46 publications

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“…Generally, for radio propagation predictions path loss has been modeled using the log-distance model, which includes normal distributed shadow fading [14], [15]. Other studies have taken advantage of the spatial correlation of shadowing to estimate it by including Kriging, which has minimized the variance of estimation errors, due to Kriging employs variography to restrict how far and where to look for the samples to be used in the interpolation [16], yielding accurate shadowing predictions, as has been validated in [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Towards Practical Path Loss Predictions in Indoor Corridors Considering 5G mmWave Three-Dimensional Measurements

Diago-Mosquera

Aragón‐Zavala

Rodríguez

2022

Antennas Wirel. Propag. Lett.

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Theoretical and empirical foundations of how radio waves behave in practical wireless channels need to be fully revisited for millimeter-wave (mmWave) frequencies so that fifthgeneration (5G) technologies may be successful. Kriging is an outstanding geostatistal interpolation technique that employs variography to understand the spatial variability of known samples at specific locations to predict unmeasured samples, based on the fact that there is an implied connection between the measured value and its location in space. The research we here report is aimed at validating the improvement in predictions when this tool is included for mmWave frequency path loss modeling in a long indoor corridor with break. In order to quantify the accuracy of the proposed methodology, it is compared with a wellestablished procedure described in the literature. Extensive pathloss measurements were collected through specialized narrowband sounders at 28 and 60 GHz. Spatially averaged power measurements using omnidirectional and directive antennas at different heights provided the empirical basis for the threedimensional (3D) Kriging-aided model. It was found that this method significantly improves the accuracy as it considers all the singularities and site-associated features that are implicit in measured samples. This is important to obtain a reliable path loss model for planning and deployment of mmWave wireless communication systems in indoor scenarios.

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Section: Introductionmentioning

confidence: 99%

Towards Practical Path Loss Predictions in Indoor Corridors Considering 5G mmWave Three-Dimensional Measurements

Diago-Mosquera

Aragón‐Zavala

Rodríguez

2022

Antennas Wirel. Propag. Lett.

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“…Therefore, it is possible to estimate unknown values from the best set of available sample points, which consider the singularities and the characteristics associated with the selected scenario. An outstanding influence of Kriging interpolation on the construction of radio environment map (REM) has also been observed in various works [12–17]. REM is a tool for analysing radio propagation, which is typically defined as a map that stores the received signal power.…”

Section: Introductionmentioning

confidence: 99%

The performance of in‐building measurement‐based path loss modelling using kriging

Diago-Mosquera

Aragón‐Zavala

Vargas-Rosales

2021

IET Microwaves Antenna & Prop

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An accuracy evaluation analysis of a novel in-building measurement-based path loss prediction narrowband model is presented here, comparing the performance of Krigingaided shadowing prediction against the most traditional assumption of slow fading as a random variable and a classical estimation derived from linear interpolation. Extensive radio measurements were employed using distinct samples to calibrate (tuning dataset) and validate (testing dataset) the model. Path loss predictions are made over the testing dataset locations to compare it against the measured values, thus obtaining an error in the prediction from the difference between measurements and predictions. The results in the seven buildings evaluated show the potential of Kriging-aided channel modelling with a higher level of confidence than other modelling approaches compared hereafter.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…The simple model can be applied to the current DSS-MS system with a little calculation. To obtain a more precise estimation, a highly precise propagation model for each location is also being studied based on a spectrum map [9]. The other approach is for future implementation, and it uses AI/ML for more precise propagation estimation [10].…”

Section: Uss Detection Technologiesmentioning

confidence: 99%

Research & Development of the Advanced Dynamic Spectrum Sharing System between Different Radio Services

Shinbo

Yamazaki

Kishi

2021

IEICE Trans. Commun.

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To achieve highly efficient spectrum usage, dynamic sharing of scarce spectrum resources has recently become the subject of intense discussion. The technologies of dynamic spectrum sharing (DSS) have already been adopted or are scheduled to be adopted in a number of countries, and Japan is no exception. The authors and organizations collaborating in the research and development project being undertaken in Japan have studied a novel DSS system positioned between the fifth-generation mobile communication system (5G system) and different incumbent radio systems. Our DSS system has three characteristics. (1) It detects dynamically unused sharable spectrums (USSs) of incumbent radio systems for the space axis by using novel propagation models and estimation of the transmitting location with radio sensor information. (2) It manages USSs for the time axis by interference calculation with propagation parameters, fair assignment and future usage of USSs. (3) It utilizes USSs for the spectrum axis by using methods that decrease interference for lower separation distances. In this paper, we present an overview and the technologies of our DSS system and its applications in Japan.

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Space-Frequency-Interpolated Radio Map

Cited by 37 publications

References 46 publications

Towards Practical Path Loss Predictions in Indoor Corridors Considering 5G mmWave Three-Dimensional Measurements

Towards Practical Path Loss Predictions in Indoor Corridors Considering 5G mmWave Three-Dimensional Measurements

The performance of in‐building measurement‐based path loss modelling using kriging

Research & Development of the Advanced Dynamic Spectrum Sharing System between Different Radio Services

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