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Scattering Analysis of Nano-Scale Chiral Structures in Optical Vortex Using Method of Moments 用矩量法分析光学涡旋中纳米级手性结构的散射
IF 0.7
IEICE Communications Express Pub Date : 2026-06-01 Epub Date: 2026-04-14 DOI: 10.23919/comex.2026SPL0014
Chenxu Wang;Hideki Kawaguchi;Hiroaki Nakamura;Koichi Matsuo;Masahiro Katoh
{"title":"Scattering Analysis of Nano-Scale Chiral Structures in Optical Vortex Using Method of Moments","authors":"Chenxu Wang;Hideki Kawaguchi;Hiroaki Nakamura;Koichi Matsuo;Masahiro Katoh","doi":"10.23919/comex.2026SPL0014","DOIUrl":"https://doi.org/10.23919/comex.2026SPL0014","url":null,"abstract":"This paper presents a full 3D Method of Moments (MoM) simulation for analysis of scattering from nano-scale chiral ribbon structures under optical vortex illumination to aim to investigate electromagnetic mechanism of circular dichroism (CD) and optical vortex dichroism (VD). Both twist and helical nano-ribbons are modeled as dispersive materials scatterer. CD and VD are evaluated quantitatively by differences in scattering power. Numerical results demonstrate that angular momentum of optical light induces dichroic response effectively.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 6","pages":"190-193"},"PeriodicalIF":0.7,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11481629","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Privacy-Preserving Open Dataset for Campus Wi-Fi Access Point Usage 校园Wi-Fi接入点使用的隐私保护开放数据集
IF 0.7
IEICE Communications Express Pub Date : 2026-06-01 Epub Date: 2026-04-14 DOI: 10.23919/comex.2026XBL0025
Masato Masuya;Takahiro Nemoto;Ryosuke Sato
{"title":"A Privacy-Preserving Open Dataset for Campus Wi-Fi Access Point Usage","authors":"Masato Masuya;Takahiro Nemoto;Ryosuke Sato","doi":"10.23919/comex.2026XBL0025","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0025","url":null,"abstract":"On university campuses, Wi-Fi access points are indispensable infrastructure for learning and research. Although many universities deploy numerous access points across diverse locations, their usage logs are typically restricted to a small group of authorized staff to ensure security and privacy. Consequently, although this usage log data has potential for applications such as crowding visualization and data-science education, it remains underutilized. To address this gap, we construct a Wi-Fi usage dataset that preserves security and privacy while being suitable for release as open data. The resulting resource enables reproducible studies by internal and external researchers and supports hands-on curricula in data science.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 6","pages":"231-234"},"PeriodicalIF":0.7,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11481636","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
V2X Visible Light Communication Using an LED Bar and a Rolling Shutter Image Sensor: A Demodulation Method with Complementary use of Raw and Processed Images for Long-Range and High-Speed Mobile Environments 使用LED条和滚动快门图像传感器的V2X可见光通信：远程和高速移动环境中互补使用原始和处理图像的解调方法
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2025XBL0168
Ryota Kondo;Tsukasa Shimizu;Shintaro Shiba;Kosuke Nakano;Ryota Soga;Aoi Sawada;Shan Lu;Takaya Yamazato
{"title":"V2X Visible Light Communication Using an LED Bar and a Rolling Shutter Image Sensor: A Demodulation Method with Complementary use of Raw and Processed Images for Long-Range and High-Speed Mobile Environments","authors":"Ryota Kondo;Tsukasa Shimizu;Shintaro Shiba;Kosuke Nakano;Ryota Soga;Aoi Sawada;Shan Lu;Takaya Yamazato","doi":"10.23919/comex.2025XBL0168","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0168","url":null,"abstract":"This paper introduces a long-range visible light communication system adaptable to high-speed mobile environments, based on an LED bar and a rolling shutter image sensor. Prior work [1] faced challenges regarding communication distance and accuracy during mobility. To address these issues, we modified the signal processing method and introduced a novel demodulation algorithm. This algorithm complementarily leverages the raw received image and its processed counterpart to realize highly noise-resistant demodulation, a task challenging for simple binarization methods. The effectiveness of the proposed approach was verified through outdoor experiments in both static and mobile environments. The results demonstrate that in static scenarios, no errors were observed at distances up to 125 m, surpassing prior work, and the system showed robust performance with no significant degradation in rainy weather. Furthermore, in mobile experiments, we successfully sustained communication with no detected errors even at high speeds of 120 km/h. These findings indicate that the proposed system offers high reliability in both long-range and dynamic V2X environments.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"109-113"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Network-Controlled User Allocation Scheme for IEEE 802.11be Multi-Link Wireless LANs IEEE 802.11be多链路无线局域网的网络控制用户分配方案
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2025XBL0165
Hirantha Abeysekera;Kotaro Nagano;Tomoyuki Yamada;Junichi Iwatani;Yusuke Asai
{"title":"Network-Controlled User Allocation Scheme for IEEE 802.11be Multi-Link Wireless LANs","authors":"Hirantha Abeysekera;Kotaro Nagano;Tomoyuki Yamada;Junichi Iwatani;Yusuke Asai","doi":"10.23919/comex.2025XBL0165","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0165","url":null,"abstract":"One of the key features of IEEE 802.11be is multi-link operation (MLO), enabling stations (STAs) to transmit and receive data simultaneously on multiple frequency channels, i.e., multi-links. The number of links is limited by the minimum supported by either the STA or the access point (AP). Throughput degradation arises from mismatched multi-link capabilities between APs and STAs and imbalanced STA distribution, highlighting the importance of appropriate AP selection in IEEE 802.11be MLO networks. This paper proposes a network-controlled user allocation scheme for IEEE 802.11 be wireless LANs with varying link capabilities. The proposed scheme determines the quasi-optimal AP for each STA in a centralized manner to maximize the given utility function. Simulation results demonstrate that the proposed scheme outperforms conventional approaches.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"79-82"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Secrecy Performance Analysis of Keyhole MIMOME Wiretap Channels with Imperfect CSI 不完全CSI下锁孔MIMOME窃听信道的保密性能分析
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2026XBL0001
Xujie Zang;Hongwen Yang
{"title":"Secrecy Performance Analysis of Keyhole MIMOME Wiretap Channels with Imperfect CSI","authors":"Xujie Zang;Hongwen Yang","doi":"10.23919/comex.2026XBL0001","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0001","url":null,"abstract":"This paper investigates physical layer security in multi-antenna keyhole systems with imperfect channel state information (CSI). In dense urban environments, rank-deficient channels, specifically the rank-one key-hole effect, significantly degrade secrecy performance. We derive closed-form asymptotic expressions for the secrecy outage probability (SOP) and average secrecy rate (ASR) in the high signal-to-noise ratio (SNR) regime. Based on the analytical results and Monte-Carlo simulations, the impacts of key parameters, such as Alice's antenna number and CSI error variance, are quantified and discussed, which provides insights into robust secrecy design.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"104-108"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396453","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Four-Element Printed Inverted-F Antenna Array for Sub-6 GHz 5G and Wi-Fi 6E MIMO Applications 一种用于Sub-6 GHz 5G和Wi-Fi 6E MIMO应用的四元印刷倒f天线阵列
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2026XBL0003
Cho Thet Htar;Takafumi Fujimoto;Chai-Eu Guan
{"title":"A Four-Element Printed Inverted-F Antenna Array for Sub-6 GHz 5G and Wi-Fi 6E MIMO Applications","authors":"Cho Thet Htar;Takafumi Fujimoto;Chai-Eu Guan","doi":"10.23919/comex.2026XBL0003","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0003","url":null,"abstract":"This research presents a four-element printed inverted-F (IFA) MIMO antenna designed for multi-standard wireless applications, including sub-6 GHz 5G (3.6–4.1 GHz and 4.5–4.6 GHz) and Wi-Fi 6E (2.4–2.484 GHz, 5.15–5.35 GHz, 5.47–5.73 GHz, and 5.945–6.425 GHz). A wideband printed IFA previously proposed by the authors is used as the individual antenna element, and two types of decoupling elements are employed to improve isolation between the antenna elements. The effects of the decoupling elements on S-parameters are analyzed by simulation. The measured S-parameters and radiation characteristics demonstrate the effectiveness of the proposed antenna.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"91-94"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396458","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Integrated Transmission-Trigger Control for Reducing AGV Communication Load 降低AGV通信负荷的集成传输触发控制
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2025XBL0159
Ryuto Kon;Eri Hosonuma;Takuya Shindo;Nobuhiko Itoh
{"title":"Integrated Transmission-Trigger Control for Reducing AGV Communication Load","authors":"Ryuto Kon;Eri Hosonuma;Takuya Shindo;Nobuhiko Itoh","doi":"10.23919/comex.2025XBL0159","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0159","url":null,"abstract":"Automated Guided Vehicles (AGVs) are increasingly deployed in factories and warehouses to improve material handling efficiency. However, as the number of AGVs grows, wireless communication congestion caused by concentrated status updates may lead to transmission delays and reduce operational safety. A physical context-aware communication control method has been proposed, combining periodic reporting and error-driven reporting. Because these triggers operate independently, redundant transmissions may occur when an error-driven update is followed by an imminent periodic report. This paper proposes an integrated transmission-interval control method that recalculates the periodic reporting interval upon prediction-error detection, preventing trigger overlap. Simulation results in an intersection-passing scenario show that the proposed method reduces wireless communication load by up to 11% without degrading transportation performance, demonstrating the effectiveness of coordinated dual-trigger control for scalable multi-AGV systems.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"75-78"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396087","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Blind Compensation of Frequency-Dependent IQ Imbalance for Various Modulation Schemes in Cognitive Radios 认知无线电中不同调制方案中频率相关IQ不平衡的盲补偿
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2025XBL0149
Letebele Bright Sosome;Naoto Sasaoka;Tadao Nakagawa
{"title":"Blind Compensation of Frequency-Dependent IQ Imbalance for Various Modulation Schemes in Cognitive Radios","authors":"Letebele Bright Sosome;Naoto Sasaoka;Tadao Nakagawa","doi":"10.23919/comex.2025XBL0149","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0149","url":null,"abstract":"Cognitive radios adaptively sense and use available spectrum but suffer performance loss due to IQ imbalance, which causes interference from gain and phase mismatches in transceivers. Blind IQ-imbalance compensation avoids pilots and suits cognitive radios that must continually adjust to changing channels. While OFDM and SC-FDE have known blind-compensation methods, CE-OFDM has not been studied, and immunity to frequency-dependent imbalance remains unreported. This paper presents the first unified comparison of OFDM, CE-OFDM, and SC-FDE under frequency-dependent IQ imbalance, enabled by adapting an SC-FDE blind-compensation technique.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"71-74"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396450","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Proposal for Metasurface Reflector with Short Posts 短柱超表面反射器的设计方案
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2025XBL0144
Shinya Endo;Mitoshi Fujimoto;Ryo Yamaguchi;Kazuma Tomimoto;Tomonori Ikeda
{"title":"Proposal for Metasurface Reflector with Short Posts","authors":"Shinya Endo;Mitoshi Fujimoto;Ryo Yamaguchi;Kazuma Tomimoto;Tomonori Ikeda","doi":"10.23919/comex.2025XBL0144","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0144","url":null,"abstract":"In Beyond 5G and 6G, metasurface reflectors that control reflection direction are promising for reducing coverage holes. In conventional configuration, reflection phase is adjusted by element size, however it is sensitive to fabrication errors. In this paper, a new design configuration that the element size is fixed and the reflection phase is controlled by arranging short posts (SPs), then reducing error sensitivity. Using FDTD analysis, an optimal dielectric thickness that achieves a 360 degrees phase range and high reflection intensity is found. The simulation results show that the main beam is formed at the target direction of 30 degrees with intensity of −2.1 dB.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"87-90"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Simple Method of Estimating Dielectric Properties for the Medium-Frequency Band 一种估算中频带介电特性的简单方法
IF 0.3
IEICE Communications Express Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.23919/comex.2025XBL0134
Takuma Hattori;Tsugumi Nishidate;Kazuyuki Saito
{"title":"A Simple Method of Estimating Dielectric Properties for the Medium-Frequency Band","authors":"Takuma Hattori;Tsugumi Nishidate;Kazuyuki Saito","doi":"10.23919/comex.2025XBL0134","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0134","url":null,"abstract":"This study proposes a simple and reproducible method for estimating the relative permittivity and conductivity of materials with relatively high dielectric properties, such as biological tissues, in the medium-frequency (MF) band. In the proposed method, a measurement probe is pressed against the surface of the measurement under test to acquire the complex impedance between electrodes. The dielectric properties are then estimated through an inverse approach by comparing the measured impedance with an impedance distribution chart generated via numerical simulations. Experiments using deionized water and porcine liver demonstrated good agreement between the estimated and reference values reported in the literature, with coefficients of variation about 5%, indicating high reproducibility. The proposed method has the potential to serve as an effective technique for measuring electrical properties in the MF band.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 4","pages":"67-70"},"PeriodicalIF":0.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396457","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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