Takatoshi Sugiyama’s research while affiliated with Kogakuin University and other places

... The easiest to implement among those techniques is the Clipping scheme [29], [30], as it only requires limiting the signal's output amplitude. However, clipped signals are prone to nonlinear distortion, and it is difficult to select the optimal clipping threshold and position index, leading to a degradation in bit error rate (BER) performance [31]. ...

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A Low Complexity Dual-Phase Alternating Scheme is Used with the PTS Method to Reduce PAPR for B5G Systems

... Our previous study disclosed that two pairs of transmitter/receiver could co-exist in a certain level of signal-to-interference power ratio (SIR) condition. Its fundamental feasibility was verified through the indoor experiment [2] and adaptive subcarrier bit loading was proposed to expand its operational region [3]. In this scenario, the secondary receiver should adaptively switch the BAA algorithm according to the input SIR value and its realization has been a substantial challenge to be overcome. ...

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CNN-based blind SIR classification framework for STPA-BAA spectrum superposing

... Therefore, using this property, we propose an application of NOMA with multi-satellites into the downlink of STICS for performance improvement. It was shown in [8] that a large capacity enhancement was realized by precoded multi-satellite MIMO transmission. By utilizing a MIMO channel with multi-satellites and NOMA, both capacity enhancement and fair resource allocation are realized. ...

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Application of Non-Orthogonal Multiple Access Scheme for Satellite Downlink in Satellite/Terrestrial Integrated Mobile Communication System with Dual Satellites

... FSSs applications have also been presented in the fields of millimeter-wave quasi-optical filters and diplexers, dichroic surfaces for reflectors and large aperture antennas' subreflectors and absorbers [7][8][9][10]. Fractal geometries have been extensively implemented in the design of multiband antennas and FSSs. ...

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Multiband FSS with Fractal Characteristic Based on Jerusalem Cross Geometry

... Moreover, estimation and feedback of channel state and other system information must be rethought to achieve scalable and efficient solutions in future wireless networks. These are the topics considered in three papers of our special issue [25][26][27]. While the work [25] develops a scalable channel state information (CSI) estimation with controllable resolution and complexity for future dense networks, the paper [26] studies the CSI estimation problem for a very wideband wireless channel using the sampling rate less than the Nyquist rate. ...

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Enabling 5G mobile wireless technologies

... Nakahira, K. et al. attempted to design a dynamic spectrum control (DSTC) channel allocation algorithm to facilitate the improvement of satellite communication information data output. Simulation experimental results show that the DSTC algorithm augmented for that information data throughput is relatively improved by 60% [14]. Liu, S. et al. developed a path allocation method with clustering and Markov chain ideas as the underlying architecture, which promotes the performance optimization of satellite communication link switching and resource allocation [15]. ...

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Exploration of the application of optimisation algorithm using stochastic gradient descent method in satellite resource allocation

... However, its application in the wireless network case is being intensely investigated [82,70,83]. Wireless network coding (WNC) exploits the broadcasting nature of wireless channels to provide a throughput gain as can be shown in the example illustrated in Figure 2.8 [2]. In this example, nodes A and B need to exchange messages via the relay node R as they are too distant to communicate directly. ...

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Network coding application for online games platformes

... Modelling the environment perfectly and taking each reflection into consideration would result in a computationally complex deterministic model. For example, to run ray tracing using the imaging method requires computing each reflection in a search space of A B , where A is the number of walls and B is the number of reflections [1]. Simpler, empirical models do not require as much computation, and instead capture the K. Preusser and A. Schmeink are with the Teaching and Research Area Information Theory and Systematic Design of Communication Systems (ISEK), at RWTH Aachen University, Germany, e-mail: kiraseya.preusser@isek.rwthaachen.de, ...

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Robust Channel Modeling of 2.4 GHz and 5 GHz Indoor Measurements: Empirical, Ray Tracing, and Artificial Neural Network Models

... After achieving interference identification of the test feature sample, all points of the beat frequency signal in the window corresponding to the test feature sample are labeled as interference, and then signal reconstruction of the interference region is achieved by the AR model. The AR model is a statistical model based on time series [34], which assumes that the output value at the current moment is only related to the output values of the previous number of moments and not to other moments in the past. This assumption allows the AR model to describe the statistical patterns of a time series with fewer parameters, thus enabling efficient data analysis and prediction. ...

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Support Vector Machines Based Mutual Interference Mitigation for Millimeter-Wave Radars

... In the same context, Microstrip patch antenna is firstly design on high impedance surface and FSS layer is placed an adequate distance for creation of fabry perot res- onator [17]. Most of the work for the prominence of wide band, multiband by the suitable placement of superstrate layer181920. Thus, by using FSS superstrate or its combination can control gain, bandwidth and polarization properties. ...

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Circularly polarized inverted stacked high gain antenna with frequency selective surface