Tetsuro Imai’s research while affiliated with Tokyo Denki University and other places

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Publications (126)


Proposal on Radio Propagation Prediction System Using Quantum Annealers
  • Conference Paper

November 2024

Keita Fujita

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Tetsuro Imai

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Wataru Yamada

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[...]

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Ryotaro Taniguchi


Fig. 6 Cumulative probability distribution of absolute value of prediction error with the proposed model and ITU model
Proposal on Rain Attenuation Prediction Method Using Convolutional Neural Network
  • Article
  • Full-text available

June 2024

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60 Reads

IEICE Communications Express

Recently, the practical application of HAPS (High Altitude Platform Station) as the next-generation communication platform is studied actively. HAPS employs adaptive rain attenuation countermeasure techniques such as site diversity methods, therefore it is ideal to predict rain attenuation on the path in real time. We proposed real-time rain attenuation prediction method by convolutional neural network that inputs image of rainfall rate and path distance. Result showed that prediction accuracy of our proposed method is better than a method using conventional formulas.

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Citations (64)


... In [74] the imaging method, a variant of ray tracing, is approached with a quantum annealer. Given a number of VOLUME 11, 2023 interactions N and a set of M interaction objects, the problem to be solved is to find the dominant propagation path, i.e., the path that experiences exactly N reflections or diffractions and has minimal propagation loss (PL). ...

Reference:

Quantum Algorithms in Electromagnetic Propagation Modelling for Telecommunications
Radio Propagation Analysis Using Quantum Annealing
  • Citing Conference Paper
  • December 2022

... Ionospheric sounding is mainly about obtaining the parameter characteristics of the ionosphere in a certain region through the form of networking, as well as constructing the ionospheric model using the parameters, ray tracing, and other techniques to realize regional HF frequency planning and channel characteristic assessments [8]. According to the method and process of propagation, ionospheric sounding can be divided into two modes, one is ground-based sounding and the other is sky-based sounding. ...

Ray Tracing Parameter Optimization System in Mobile Radio Propagation Prediction
  • Citing Conference Paper
  • September 2022

... Despite increased route loss outside, the approach delivers high packet delivery ratios, average throughput, and low latency. [55] mmWaves Urban ...

Measurement and Ray Tracing Simulation with Urban Microcell Environments at 28 GHz Band
  • Citing Article
  • December 2021

IEICE Transactions on Communications

... The selection of frequencies 24 GHz and 27 GHz, which fall within the millimeter-wave spectrum [13], [14], presents notable advantages for 5G applications [15], including elevated data rates, reduced latency, TELKOMNIKA Telecommun Comput El Control  1×2 microstrip patch antennas array for mm-waves 5G application (Karima Benkhadda) 41 and expanded network capacity. Moreover, selecting these frequencies aligns with worldwide initiatives aimed at allocating spectrum for the deployment of 5G technology. ...

Direction of Arrival Estimation of Circular Array Using Compressed Sensing in 20-GHz Band
  • Citing Article
  • February 2021

IEEE Antennas and Wireless Propagation Letters

... Also, since the input images do not change with frequency, frequency as a scalar parameter is added to the later fully connected neural network (FNN) part to take the frequency characteristics into account. The validity of the proposed model was evaluated by learning and validating the model with measured data [10] and then determining the error between the measured and estimated values. Fig. 1 shows the structure of the proposed model. ...

Extension of ITU-R Site-General Path Loss Model in Urban Areas Based on Measurements from 2 to 66 GHz Bands
  • Citing Article
  • January 2021

IEICE Transactions on Communications

... Figure 1 depicts how different channels get spectrally overlapped by producing the undesirable ICI. The ICI effects have been mitigated by utilizing multipleinput multiple-output (MIMO) equalizers, which in turn exploit the information of adjacent channels in order to estimate the channel according to the spectral spacing between the signals [4][5][6][7]. Nevertheless, in future gridless optical networks, the information of the adjacent channels will not be accessible at the end nodes. This scenario can be seen in Fig. 2, which shows a gridless network with diverse source (S) and destination (D) nodes. ...

Time-Varying Channel Interference Reduction by Interference Channel Measurement in MU-MIMO
  • Citing Conference Paper
  • September 2019

... The major installation environments of small cells are urban street cell environments where pedestrians and vehicles are densely populated [1]. In order to understand the propagation characteristics in such environments, it is necessary to analyze the data obtained by field measurements [2] or to perform simulation analysis by complex modeling of moving objects and trees [3,4]. ...

Angle of Arrival Characteristics at 20 GHz band in LOS Urban Area Street Cell Environment
  • Citing Conference Paper
  • September 2019

... Outdoor positioning is a practical function in people's daily life, which has been involved in many aspects of life, and it is also one of the basic service and application modules of government and commercial units, even in the military field. Many companies and scientific research teams are engaged in related research [1,2]. At present, the mature outdoor positioning technology is based on satellites, such as the Global Positioning System (GPS) and the BeiDou Navigation Satellite System (BDS). ...

Study on Path Identification at 40 GHz Band in NLOS Urban Street Cell Environment
  • Citing Conference Paper
  • April 2019

... Stimulated by the ever-increasing demand for wireless end-user devices and high-capacity wireless communications, the shift towards higher carrier frequencies has become an essential trend with the roll-out of 5 G cellular networks [3][4][5][6]. Despite the shorter wavelengths have prominent superiorities such as increased bandwidth and higher rates of data transfer over longer wavelengths [7][8][9], the reduced coverage area [10,11] and the increased propagation attenuation [12][13][14] preclude excellent signal reception for indoor applications. Conventional approaches to solve this issue, such as increasing the power of radiation, suffer from the drawbacks of increased power consumption [15], cost inefficiency, and could also be hazardous to health [16]. ...

High Speed Mobility Experiments on Distributed MIMO Beamforming for 5G Radio Access in 28-GHz Band
  • Citing Article
  • February 2019

IEICE Transactions on Communications