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A Reconfigurable Circularly Polarized Microstrip Antenna with Dual Unipolar Control Voltages 具有双单极控制电压的可重构圆极化微带天线
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0044
Yuki Hirayama;Eisuke Nishiyama;Ichihiko Toyoda
{"title":"A Reconfigurable Circularly Polarized Microstrip Antenna with Dual Unipolar Control Voltages","authors":"Yuki Hirayama;Eisuke Nishiyama;Ichihiko Toyoda","doi":"10.23919/comex.2026XBL0044","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0044","url":null,"abstract":"This letter presents a reconfigurable circularly polarized (CP) microstrip antenna that achieves polarization switching using only positive voltages. The antenna maintains a single-layer structure integrating a ring slot and a central via hole, enabling intrinsic DC-RF isolation within the antenna structure, eliminating the need for on-board choke components. A varactor diode and a chip capacitor are employed to control the ±90° phase difference between two orthogonal modes, allowing left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) switching without voltage polarity inversion. While maintaining the same circuit configuration as the previous bipolar-voltage design, the proposed antenna enables unipolar operation, providing easier integration with low-voltage control systems. A 5.8-GHz prototype was fabricated and measured, confirming CP reconfigurability with a low axial ratio (AR) and good impedance matching. The proposed element exhibits high implementation compatibility for high-density array and low-voltage-driven applications.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"239-242"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548529","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442766","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
Analysis of Reproducibility of Bulk Current Injection (BCI) Method and Examination of Single-Wire Current Injection (SWCI) Method 大电流注入法（BCI）重现性分析及单线电流注入法（SWCI）检验
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0038
Takanori Uno;Tatsuya Inoue;Hirofumi Yamada;Mitsuo Kaiyama;Ryo Nishikaji
{"title":"Analysis of Reproducibility of Bulk Current Injection (BCI) Method and Examination of Single-Wire Current Injection (SWCI) Method","authors":"Takanori Uno;Tatsuya Inoue;Hirofumi Yamada;Mitsuo Kaiyama;Ryo Nishikaji","doi":"10.23919/comex.2026XBL0038","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0038","url":null,"abstract":"This letter analyzes the test reproducibility of the BCI method, which is one of the immunity tests for automotive components. The analysis does not take a probability-based approach, but is carried out by using an experimental jig that ensures reproducibility for the wire placement and layout. The results of evaluation and electromagnetic field simulation show that sufficient reproducibility is guaranteed under conditions where the position and layout are guaranteed. Based on this data, the appropriate amplitude of the injected current when applying the BCI method to a single wire is also discussed.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"295-298"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548528","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442897","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
High-Resolution Delay Estimation for OFDM Radar via Phase-Compensated Circle Fitting 基于相位补偿圆拟合的OFDM雷达高分辨率时延估计
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0059
Keisuke Miyano;Gakuto Imamura;Yoneo Akita;Kunihisa Jitsuno;Keizo Inagaki;Tetsuya Kawanishi
{"title":"High-Resolution Delay Estimation for OFDM Radar via Phase-Compensated Circle Fitting","authors":"Keisuke Miyano;Gakuto Imamura;Yoneo Akita;Kunihisa Jitsuno;Keizo Inagaki;Tetsuya Kawanishi","doi":"10.23919/comex.2026XBL0059","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0059","url":null,"abstract":"Ranging techniques using orthogonal frequency-division multiplexing (OFDM) signals play an important role in realizing integrated sensing and communication (ISAC) systems. However, conventional methods face challenges in separating closely spaced targets due to bandwidth limitations. To address this issue, we propose a novel ranging method that applies phase-compensated circle fitting to the trajectory of the channel frequency response on the complex plane. The proposed method is validated through experimental measurements involving two closely spaced targets. The results demonstrate that the proposed method achieves significantly improved performance, particularly when a power difference exists between the paths.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"259-263"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548538","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442315","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
Enhancing Neural Network Decoder Performance for Convolutional Polar Codes 增强卷积极码的神经网络解码器性能
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0058
Yuto Nakamura;Nobuhiko Miki;Satoshi Suyama;Satoshi Nagata
{"title":"Enhancing Neural Network Decoder Performance for Convolutional Polar Codes","authors":"Yuto Nakamura;Nobuhiko Miki;Satoshi Suyama;Satoshi Nagata","doi":"10.23919/comex.2026XBL0058","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0058","url":null,"abstract":"This paper investigates a low-latency decoding approach for convolutional polar codes using a neural network decoder (NND). Although NNDs enable one-shot decoding and significantly reduce latency, their error-rate performance can be further improved. To address this issue, we introduce a training strategy combining importance sampling, a ResNet-based architecture, and ensemble learning. Simulation results obtained using a convolutional polar code and an NND over an AWGN channel are presented. The proposed NND achieves stepwise improvements in BER compared with a conventional NND baseline, while preserving low decoding latency.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"268-272"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548537","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442574","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 Proposal of Adaptive Beamspace Method for Single-Snapshot Direction-of-Arrival Estimation 一种单快照到达方向估计的自适应波束空间方法
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0051
Yuji Tanaka;Nobuyoshi Kikuma;Yoshiki Sugimoto;Kunio Sakakibara
{"title":"A Proposal of Adaptive Beamspace Method for Single-Snapshot Direction-of-Arrival Estimation","authors":"Yuji Tanaka;Nobuyoshi Kikuma;Yoshiki Sugimoto;Kunio Sakakibara","doi":"10.23919/comex.2026XBL0051","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0051","url":null,"abstract":"The beamspace (BS) method is an effective preprocessing technique for improving the efficiency of direction-of-arrival (DOA) estimation using array antennas. However, the conventional BS method sometimes results in an excess or shortage of beams depending on the observed data. This paper proposes an Adaptive BS (ABS) method that adaptively determines the number of beams in the BS method according to the observed single snapshot signal. We show the result of the initial evaluation of the ABS method, which indicates that the ABS method can appropriately reduce the number of input beams for the subsequent DOA estimation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"250-254"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548533","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442588","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 Study on Improvement of Accuracy in Estimation of Radio Signal Strength in a Factory by 3D U-Net 三维U-Net提高工厂无线电信号强度估计精度的研究
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0047
Riku Kakamu;Tomoaki Nonome;Naoki Kato;Seiichi Harata;Takuto Sakuma;Shohei Kato;Hiroshi Hirayama
{"title":"A Study on Improvement of Accuracy in Estimation of Radio Signal Strength in a Factory by 3D U-Net","authors":"Riku Kakamu;Tomoaki Nonome;Naoki Kato;Seiichi Harata;Takuto Sakuma;Shohei Kato;Hiroshi Hirayama","doi":"10.23919/comex.2026XBL0047","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0047","url":null,"abstract":"In this paper, we propose a received signal strength indicator (RSSI) estimation model using sparse measurements as input. In smart factories, there are numerous wireless communication devices, so optimization of access point placement is required. Previously, an RSSI estimation model using a 3D U-Net with a convolutional neural network (CNN) was proposed. The proposed model aims to improve estimation accuracy by providing sparse measurements to the Non-Line-of-Sight (NLoS) area. As a result, estimation accuracy improved by an average of 1.24 dB compared to conventional methods, and estimation time was reduced to 1/82 of that required for simulation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"282-285"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548530","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442747","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
Reliable Networked Motion Control Using Event-Triggered Network Coding Based on Quality of Performance for SiPhON Architecture 基于虹吸结构性能质量的事件触发网络编码可靠网络运动控制
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0035
Shogo Nagae;Ryogo Kubo
{"title":"Reliable Networked Motion Control Using Event-Triggered Network Coding Based on Quality of Performance for SiPhON Architecture","authors":"Shogo Nagae;Ryogo Kubo","doi":"10.23919/comex.2026XBL0035","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0035","url":null,"abstract":"In mission-critical networked systems, such as motion control and automotive systems, high-capacity and high-reliability optical networks are required. This study proposes a method to improve the reliability and efficiency of motion control systems over optical ring networks based on Si-photonics-based in-vehicle optical network (SiPhON) architecture. The proposed method includes network redundancy using network coding and communication traffic reduction using event-triggered technology based on quality of performance, i.e., tracking error. Simulations confirm that the proposed method reduces communication traffic while maintaining control performance in SiPhON-based motion control systems.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"243-246"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548527","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442801","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
Preamble-Free Display-Camera Communication Exploiting Rolling Shutter Effect and Zero-Sum Orthogonal Codes 利用滚动快门效应和零和正交码的无前导显示-摄像机通信
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0054
Kentaro Kobayashi
{"title":"Preamble-Free Display-Camera Communication Exploiting Rolling Shutter Effect and Zero-Sum Orthogonal Codes","authors":"Kentaro Kobayashi","doi":"10.23919/comex.2026XBL0054","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0054","url":null,"abstract":"In display-camera communication (DCC), asynchronism and sampling rate mismatch between a transmitter and a receiver cause temporal inter-symbol interference and necessitate synchronization headers (preambles), which severely degrade effective throughput. This paper proposes a preamble-free spatio-temporal self-synchronization and maximal-ratio combining (MRC) demodulation scheme. By reverse-exploiting the spatial expansion of the temporal phase caused by the rolling shutter phenomenon as a spatio-temporal fingerprint, along with zero-sum orthogonal codes superimposed on the transmission data, the proposed scheme simultaneously estimates the temporal parameters (e.g., initial phase) from merely a single captured frame. Furthermore, MRC based on the estimated time parameters optimally recovers the dispersed signal energy to maximize the output SNR. Theoretical analysis clarifies the mathematical uniqueness and convergence of the proposed model, and quantitatively demonstrates that it achieves Mbps-class transmission, overwhelmingly surpassing conventional schemes in asynchronous oversampling environments.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"273-276"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548535","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442688","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
Measurement-Based Training Method for Enhancing Device-Free Localization Accuracy 提高无设备定位精度的基于测量的训练方法
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0055
Gesi Teng;Minseok Kim
{"title":"Measurement-Based Training Method for Enhancing Device-Free Localization Accuracy","authors":"Gesi Teng;Minseok Kim","doi":"10.23919/comex.2026XBL0055","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0055","url":null,"abstract":"Device-Free Localization (DFL) is a promising approach for smart environments and disaster response because it enables non-intrusive tracking without requiring users to carry radio devices. Radio Tomographic Imaging (RTI) enables accurate DFL by exploiting shadowing effects induced by targets on wireless links. This method models link paths between anchor nodes using a voxel-based map and estimates target locations by superimposing shadowed paths without prior environmental measurements or fingerprinting. However, robust performance depends strongly on the selection of model parameters. Because determining these parameters requires extensive calibration measurement, efficient procedures are essential for practical use. To address this issue, this letter proposes a measurement-based training strategy for Bayesian-optimized multipath-RTI and investigates how different training-point configurations affect localization performance. Experimental evaluations at 25 indoor positions demonstrate that the proposed strategy achieves stable and generalizable localization performance across different spatial conditions with reduced calibration effort.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"277-281"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548536","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442852","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
Investigation of Dense WDM Transmission for Long-Haul Multi-Span Systems using Hollow Core Fiber 远距离多跨系统中空芯光纤密集波分复用传输研究
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0052
Yumeno Seki;Hiroyuki Tsuda
{"title":"Investigation of Dense WDM Transmission for Long-Haul Multi-Span Systems using Hollow Core Fiber","authors":"Yumeno Seki;Hiroyuki Tsuda","doi":"10.23919/comex.2026XBL0052","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0052","url":null,"abstract":"This study investigates the feasibility of increasing transmission capacity by reducing adjacent channel spacing in wavelength division multiplexing (WDM) systems using hollow core fiber (HCF), which exhibits extremely low optical nonlinearity. Numerical simulations were conducted to evaluate dense coherent WDM transmission over HCF and compare its performance with conventional silica-core single-mode fiber (SMF). The results show that HCF enables stable high-density WDM transmission while maintaining narrow channel spacing. Furthermore, due to the high power tolerance of HCF, multi-span transmission with repeater spacing exceeding 160 km is achievable while maintaining stable signal quality.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"247-249"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548534","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442888","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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