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Binary-Phase Shift Keying Based Time-Domain Index Modulation Signal Detection with Low Power Local Oscillator 基于二相移键控的低功率本振时域指数调制信号检测
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026XBL0009
Wataru Imajuku;Mashu Sawada
{"title":"Binary-Phase Shift Keying Based Time-Domain Index Modulation Signal Detection with Low Power Local Oscillator","authors":"Wataru Imajuku;Mashu Sawada","doi":"10.23919/comex.2026XBL0009","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0009","url":null,"abstract":"This paper investigates Binary-Phase Shift Keying (BPSK) based Time-Domain Single Carrier Index Modulation (TDSC-IM) optical signaling for next generation very high speed Passive Optical Network (VH-PON) systems that use coherent detection. Our preliminary 2.9 GBaud experiments demonstrated that the sensitivity gain attainable with TDSC-IM signaling can be used to reduce local oscillator power at receivers. This paper details additional experiments with the higher baud rate of 12.5 Gbaud and confirms the reproducibility of optical signal detection with 7 dB lower local oscillator power with the assistance of a newly developed adaptive finite-impulse response filter applicable to TDSC-IM optical signaling.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"126-129"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Accuracy Improvement of Cumulative TDOA/FDOA-Based Geolocation for Unknown Radio Sources Using Dual LEO Satellites 基于累积TDOA/ fdoa的双LEO卫星未知射电源定位精度提高
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026XBL0034
Takeshi Amishima
{"title":"Accuracy Improvement of Cumulative TDOA/FDOA-Based Geolocation for Unknown Radio Sources Using Dual LEO Satellites","authors":"Takeshi Amishima","doi":"10.23919/comex.2026XBL0034","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0034","url":null,"abstract":"This paper investigates geolocation of an unknown radio source on the Earth's surface using time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements obtained from two low Earth orbit (LEO) satellites. To improve localization accuracy, a cumulative TDOA/FDOA-based localization method is proposed by extending the conventional single-measurement approach to multiple time-sequential measurements. A theoretical expression for the localization error covariance is derived to evaluate positioning accuracy analytically. Numerical simulations demonstrate that the proposed method reduces the root mean square error (RMSE) by 67.6% compared with the conventional method. The simulation results are shown to be in good agreement with the theoretical analysis.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"152-155"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bidirectional Spectroscopic Method for Measuring Attenuation and Intrinsic Emission Spectra in Fluorescent Optical Fibers 测量荧光光纤衰减和本征发射光谱的双向光谱法
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.23919/comex.2025XBL0119
Takuya Hamasaki;Yasuhiro Tsutsumi
{"title":"Bidirectional Spectroscopic Method for Measuring Attenuation and Intrinsic Emission Spectra in Fluorescent Optical Fibers","authors":"Takuya Hamasaki;Yasuhiro Tsutsumi","doi":"10.23919/comex.2025XBL0119","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0119","url":null,"abstract":"In this study, we propose a method for evaluating both the attenuation coefficient spectrum and the intrinsic emission spectrum of fluorescent fibers. The method is based on scanning the excitation position along the fiber and measuring fluorescence spectra simultaneously at both ends. The attenuation coefficient is extracted from the square root of the spectral ratio, and the intrinsic emission spectrum is obtained by normalizing spectra at a reference wavelength. Measurements with a plastic scintillation fiber (Kuraray SCSF-78) yielded attenuation spectra consistent with specifications, confirming the validity of the method. The approach is also applicable to luminescent solar concentrators and fluorescent-fiber antennas for visible light communication.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"114-117"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Extending Post-Disaster Network Lifetime through Traffic Offloading to High-Altitude Platform Stations 通过高海拔台站流量分流延长灾后网络寿命
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026XBL0031
Shunsuke Kishi;Hiroki Nishiyama
{"title":"Extending Post-Disaster Network Lifetime through Traffic Offloading to High-Altitude Platform Stations","authors":"Shunsuke Kishi;Hiroki Nishiyama","doi":"10.23919/comex.2026XBL0031","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0031","url":null,"abstract":"In the aftermath of large-scale natural disasters, power outages often render terrestrial base stations (BSs) inoperable, severely disrupting wireless communication for information dissemination and emergency response. This study investigates traffic offloading to a high-altitude platform stations (HAPS) to extend the network lifetime of post-disaster wireless networks. We develop a mathematical model accounting for the remaining energy of BSs, the traffic capacity of the HAPS, and user traffic demand, and conduct numerical simulations under various traffic conditions. The results demonstrate the effectiveness of HAPS-assisted traffic offloading and provide insights for disaster-resilient wireless network design.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"160-163"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Indoor Radio Wave Measurement System with Integrated Simultaneous Localization and Mapping 集成同步定位与绘图的室内无线电波测量系统
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2025XBL0175
Grant Lewis Bulaong;Takuichi Hirano
{"title":"Indoor Radio Wave Measurement System with Integrated Simultaneous Localization and Mapping","authors":"Grant Lewis Bulaong;Takuichi Hirano","doi":"10.23919/comex.2025XBL0175","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0175","url":null,"abstract":"This letter presents an embedded system that integrates Simultaneous Localization and Mapping (SLAM) with Software-Defined Radio (SDR) for indoor radio wave propagation heatmapping. The system generates measurement-based heatmaps in real time and supports the preparation of simulation-based heatmaps via post-processing of the SLAM occupancy map. The SDR is configured to estimate signal-to-noise ratio (SNR) and channel state information (CSI) from the orthogonal frequency-division multiplexing (OFDM) preamble. Tests in two indoor scenarios show good agreement between measurements and ray-tracing simulations. This letter also compares the preamble-based SNR estimation against a signal-agnostic reference method, demonstrating good agreement.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"134-137"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Automating SSVC: A Worst-Case Scenario Approach for Evaluating Human Impact of Vulnerabilities 自动化SSVC：评估脆弱性对人类影响的最坏情况方法
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2025XBL0172
Daisuke Tsuji;Yuki Ueki;Nobutaka Kawaguchi;Tomo Kakuta;Hirofumi Nakakoji
{"title":"Automating SSVC: A Worst-Case Scenario Approach for Evaluating Human Impact of Vulnerabilities","authors":"Daisuke Tsuji;Yuki Ueki;Nobutaka Kawaguchi;Tomo Kakuta;Hirofumi Nakakoji","doi":"10.23919/comex.2025XBL0172","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0172","url":null,"abstract":"The number of cybersecurity vulnerabilities continues to rise, which exposes many organizations to critical risk. To address this issue, we aim to automate vulnerability triage by a Stakeholder-Specific Vulnerability Categorization (SSVC) decision tree for deployers. A challenge is that the decision point of Human Impact (HI), which comprises the impact on safety and mission, depends on both organizational context and vulnerability characteristics, making its automated evaluation difficult. We therefore propose a method that automatically determines HI by combining the pre-assessed worst-case impact with the technical impact of a vulnerability. Specifically, in the preparatory phase, we pre-assess the worst-case impact on safety and mission for each CIA triad (Confidentiality, Integrity, and Availability). Then, when a new vulnerability is discovered during the operational phase, the proposed method adjusts the worst-case impact by considering the level of the vulnerability's technical impact to derive the actual HI. The results of experiments using large language models indicates that the proposed method can automatically evaluate HI at near-expert levels. We also discuss the industrial applicability of the proposed method, including its integration with ticketing systems.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"156-159"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A K-Means Clustering Data Selection Method for Low-Complexity Least Squares in Digital Predistortion 数字预失真中低复杂度最小二乘的k均值聚类数据选择方法
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026XBL0014
Gang Yang;Fei Yang;Yanan Luo
{"title":"A K-Means Clustering Data Selection Method for Low-Complexity Least Squares in Digital Predistortion","authors":"Gang Yang;Fei Yang;Yanan Luo","doi":"10.23919/comex.2026XBL0014","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0014","url":null,"abstract":"Digital Predistortion (DPD) is a widely adopted technique to mitigate power amplifier (PA) nonlinearity, where the Least Squares (LS) method is commonly used for predistorter model coefficient estimation. However, the LS method faces a fundamental trade-off between estimation accuracy and computational complexity, where the input data length plays a important role. To address this, this paper proposes a data selection method combining k-means clustering and a Look-Up Table (LUT). First, the k-means algorithm adaptively extracts cluster centers as representative data points, which retain the critical statistical characteristics of the original long sequence by grouping samples with similar nonlinear response patterns. Second, the LUT-based simplification stores precomputed centroids offline and enables hardware-friendly online data selection via squared Euclidean distance discrimination, avoiding real-time clustering overhead. Simulation and experimental results verify that the proposed method only requires input data length of around 250 to achieve −41.5 dB and −51 dB value in Normalized Mean Square Error (NMSE) and Adjacent Channel Power Ratio (ACPR), respectively. Moreover, the LUT simplification introduces negligible performance degradation while significantly reducing hardware latency and resource consumption.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"147-151"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical-Wireless Cooperative Sleep Control with Traffic Prediction for Energy Efficient Radio Access Network 基于流量预测的高能效无线接入网光无线协同睡眠控制
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2025XBL0167
Karin Umeda;Kenji Miyamoto;Tomoya Hatano;Tatsuya Shimada
{"title":"Optical-Wireless Cooperative Sleep Control with Traffic Prediction for Energy Efficient Radio Access Network","authors":"Karin Umeda;Kenji Miyamoto;Tomoya Hatano;Tatsuya Shimada","doi":"10.23919/comex.2025XBL0167","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0167","url":null,"abstract":"While 6G necessitates more stringent performance requirements, efforts towards carbon neutrality are prompting a focus on energy-saving in networks. However, the power consumption of distributed units (DUs) in radio access network (RAN) is expected to significantly increase due to the rise in computational load for antenna signals processing resulting from rising traffic volumes. Thus, we propose an energy-saving method for RAN that sleeps unused DUs and optical transceivers using traffic prediction with machine learning. Our evaluation showed that the power consumption reduction effect can be increased more than 20% compared to implementing only DU sleep.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"122-125"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Balanced Microstrip Line with Defected Ground Structure on Thin Flexible Substrate Film 柔性薄膜上有缺陷接地结构的平衡微带线
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026XBL0005
Akihisa Tsuchiya;Yuya Yamaguchi;Ryosuke Suga;Masahiro Takeda;Eiji Inami;Hideaki Sugama;Osamu Hashimoto
{"title":"Balanced Microstrip Line with Defected Ground Structure on Thin Flexible Substrate Film","authors":"Akihisa Tsuchiya;Yuya Yamaguchi;Ryosuke Suga;Masahiro Takeda;Eiji Inami;Hideaki Sugama;Osamu Hashimoto","doi":"10.23919/comex.2026XBL0005","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0005","url":null,"abstract":"In this study, a low-loss balanced microstrip line (MSL) with a defected ground structure (DGS) on a thin, flexible substrate is proposed. This structure consists of a balanced MSL on a <tex>$25{-}mu mathrm{m}$</tex>-thick substrate and a defected structure formed on the ground plane. The measurements revealed that the balanced MSL with a DGS exhibited a transmission loss reduction of 1.5 dB/100mm at 40 GHz and maintained the same far-end crosstalk compared to a conventional balanced MSL fabricated on a <tex>$50{-}mu mathrm{m}$</tex>-thick substrate up to 40 GHz. For the same thickness substrate, the differential insertion loss of the balanced MSL with a DGS achieved an improvement of up to 4.9 dB/100mm relative to the conventional balanced MSL. The findings derived from the measurements confirm the effectiveness of the DGS. The proposed balanced line can use high-speed transmission standards in miniaturized electric devices to increase routing densities.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"138-141"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Joint Channel Estimation and Power Allocation with Low-Complexity Deep Learning for OFDM Systems in High-Speed Railway Environments 高速铁路环境下OFDM系统的低复杂度深度学习联合信道估计与功率分配
IF 0.3
IEICE Communications Express Pub Date : 2026-03-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026XBL0004
Aphitchaya Siriwanitpong;Kosuke Sanada;Hiroyuki Hatano;Kazuo Mori;Pisit Boonsrimuang
{"title":"Joint Channel Estimation and Power Allocation with Low-Complexity Deep Learning for OFDM Systems in High-Speed Railway Environments","authors":"Aphitchaya Siriwanitpong;Kosuke Sanada;Hiroyuki Hatano;Kazuo Mori;Pisit Boonsrimuang","doi":"10.23919/comex.2026XBL0004","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0004","url":null,"abstract":"In high-speed railway (HSR) OFDM systems, achieving better channel capacity requires appropriate power allocation based on accurate channel state information (CSI). While existing deep learning based channel estimation and power allocation schemes improve estimation accuracy and then provide better channel capacity, they face two major limitations: (1) high computational complexity due to deep learning neural network operations, and (2) treating channel estimation and power allocation as separate sequential processes, which increases overall computational burden. This letter proposes a low-complexity deep neural network (DNN) that jointly performs channel estimation and power allocation in a single operation. The proposed scheme achieves near-optimal channel capacity while reducing computational complexity compared to existing schemes. Simulation results demonstrate superior performance across various train speeds in terms of bit error rate (BER) and channel capacity.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 5","pages":"142-146"},"PeriodicalIF":0.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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