Toshihiko Nishimura
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View article: Leveraging 2D-VLM for Label-Free 3D Segmentation in Large-Scale Outdoor Scene Understanding
Leveraging 2D-VLM for Label-Free 3D Segmentation in Large-Scale Outdoor Scene Understanding Open
View article: Hamiltonian Monte Carlo-Based Near-Optimal MIMO Signal Detection
Hamiltonian Monte Carlo-Based Near-Optimal MIMO Signal Detection Open
Multiple-input multiple-output (MIMO) technology is essential for the optimal functioning of next-generation wireless networks; however, enhancing its signal-detection performance for improved spectral efficiency is challenging. Here, we p…
View article: Memory-Efficient Point Cloud Registration via Overlapping Region Sampling
Memory-Efficient Point Cloud Registration via Overlapping Region Sampling Open
Recent advances in deep learning have improved 3D point cloud registration but increased graphics processing unit (GPU) memory usage, often requiring preliminary sampling that reduces accuracy. We propose an overlapping region sampling met…
View article: Deep Neural Networks Based End-to-End DOA Estimation System
Deep Neural Networks Based End-to-End DOA Estimation System Open
Direction of arrival (DOA) estimation is an antenna array signal processing technique used in, for instance, radar and sonar systems, source localization, and channel state information retrieval. As new applications and use cases appear wi…
View article: DEVELOPMENT OF CURTAIN WALL SPANDREL BOARD SUPPORTED BY STRUCTURAL MEMBERS AND COMPOSITE INSULATED STEEL MEMBERS
DEVELOPMENT OF CURTAIN WALL SPANDREL BOARD SUPPORTED BY STRUCTURAL MEMBERS AND COMPOSITE INSULATED STEEL MEMBERS Open
Conventional metal curtain walls have used aluminum frames to support the fireproof boards of the spandrels. Since aluminum melts at about 660°C, the fireproof board may fall off in the event of a fire, causing the fire to spread to the up…
View article: Smart Radio Environments with Intelligent Reflecting Surfaces for 6G Sub-Terahertz-Band Communications
Smart Radio Environments with Intelligent Reflecting Surfaces for 6G Sub-Terahertz-Band Communications Open
Technology for sixth-generation (6G) mobile communication system is now being widely studied. A sub-Terahertz band is expected to play a great role in 6G to enable extremely high data-rate transmission. This paper has two goals. (1) Introd…
View article: Near-optimal stochastic MIMO signal detection with a mixture of t-distribution prior
Near-optimal stochastic MIMO signal detection with a mixture of t-distribution prior Open
Multiple-input multiple-output (MIMO) systems will play a crucial role in future wireless communication, but improving their signal detection performance to increase transmission efficiency remains a challenge. To address this issue, we pr…
View article: Development of In-hand Operable Robot Gripper for Food Grasping
Development of In-hand Operable Robot Gripper for Food Grasping Open
A robot gripper for correction work has been developed to automate rework of frozen foods and other food products. It is not known in advance which part of a food product needs to be reworked. Therefore, we developed a gripper that can rot…
View article: Sub-Terahertz MIMO Spatial Multiplexing in Indoor Propagation Environments
Sub-Terahertz MIMO Spatial Multiplexing in Indoor Propagation Environments Open
A sub-Terahertz band is envisioned to play a great role in 6G to achieve extreme high data-rate communication. In addition to very wide band transmission, we need spatial multiplexing using a hybrid MIMO system. A recently presented paper,…
View article: Accuracy Improvement in DOA Estimation with Deep Learning
Accuracy Improvement in DOA Estimation with Deep Learning Open
Direction of arrival (DOA) estimation of wireless signals is demanded in many applications. In addition to classical methods such as MUSIC and ESPRIT, non-linear algorithms such as compressed sensing have become common subjects of study re…
View article: Radio Techniques Incorporating Sparse Modeling
Radio Techniques Incorporating Sparse Modeling Open
Sparse modeling is one of the most active research areas in engineering and science. The technique provides solutions from far fewer samples exploiting sparsity, that is, the majority of the data are zero. This paper reviews sparse modelin…
View article: Channel prediction of wideband OFDM systems in a millimeter-wave band based on multipath delay estimation
Channel prediction of wideband OFDM systems in a millimeter-wave band based on multipath delay estimation Open
Multi-user MIMO systems enable high capacity transmission. A base station, however, needs accurate channel state information (CSI). In time-varying environments, the CSI may be outdated at the actual transmission time. One of the solutions…
View article: Fundamental Trial on DOA Estimation with Deep Learning
Fundamental Trial on DOA Estimation with Deep Learning Open
Direction of arrival (DOA) estimation of wireless signals has a long history but is still being investigated to improve the estimation accuracy. Non-linear algorithms such as compressed sensing are now applied to DOA estimation and achieve…
View article: Performance Evaluation of Beam Shapes in a Two-Step-Precoded Massive MIMO System
Performance Evaluation of Beam Shapes in a Two-Step-Precoded Massive MIMO System Open
Massive MIMO is known as a promising technology for multiuser multiplexing in the fifth generation mobile communication system to accommodate the rapidly-increasing traffic. It has a large number of antenna elements and thus provides very …
View article: 4. Massive MIMO
4. Massive MIMO Open
View article: A Throughput Evaluation of an Over-Distributed Antenna System with Limited Pilot Resources
A Throughput Evaluation of an Over-Distributed Antenna System with Limited Pilot Resources Open
A distributed antenna system, where the antennas of a base station are spatially distributed throughout the cell, can achieve better throughput at the cell edge than a centralized antenna system. On the other hand, the peak throughput degr…