Junichiro Hagiwara
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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: 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: 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: 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…