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Distributed Routing for Bottleneck Bandwidth Maximization Using ACO with a Node-Based Adaptive Mechanism 基于蚁群算法和节点自适应机制的瓶颈带宽最大化分布式路由
IF 0.7
IEICE Communications Express Pub Date : 2026-08-01 Epub Date: 2026-03-16 DOI: 10.23919/comex.2026TCL0001
Takumi Senaha;Takuya Asaka
{"title":"Distributed Routing for Bottleneck Bandwidth Maximization Using ACO with a Node-Based Adaptive Mechanism","authors":"Takumi Senaha;Takuya Asaka","doi":"10.23919/comex.2026TCL0001","DOIUrl":"https://doi.org/10.23919/comex.2026TCL0001","url":null,"abstract":"Maximizing the bottleneck bandwidth is a critical challenge for high-capacity data transmission. Existing distributed methods often fail in random topologies because local edge statistics do not necessarily reflect end-to-end path bottlenecks. This paper proposes a distributed routing method based on Ant Colony Optimization with a novel node-based learning mechanism that resolves the limitations of relying on local edge statistics by dynamically aligning the evaluation reference with actual path capacities using a finite history. Simulation results demonstrate a significant performance improvement, with the optimal path selection ratio from approximately 50% to 80% in random networks, while maintaining robustness in dynamic environments like Information-Centric Networking.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 8","pages":"304-308"},"PeriodicalIF":0.7,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11435612","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148661734","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
Special Cluster in Emerging Communication Technologies in Conjunction with Main Topics of IEICE ICETC 2025 and APCC 2025 结合IEICE ICETC 2025和APCC 2025主要议题的新兴通信技术特别集群
IF 0.7
IEICE Communications Express Pub Date : 2026-08-01 Epub Date: 2026-08-03 DOI: 10.23919/comex.2026TCF0001
{"title":"Special Cluster in Emerging Communication Technologies in Conjunction with Main Topics of IEICE ICETC 2025 and APCC 2025","authors":"","doi":"10.23919/comex.2026TCF0001","DOIUrl":"https://doi.org/10.23919/comex.2026TCF0001","url":null,"abstract":"This special cluster presents a selection of contributions originally reported at the 5th IEICE-CS International Conference on Emerging Technologies for Communications (IEICE ICETC) 2025, held in conjunction with the 30th Asia-Pacific Conference on Communications (APCC 2025) in Osaka, Japan, in November 2025. The joint conference was a remarkable success, attracting more than 300 participants from Japan and abroad, and providing a vibrant forum for the exchange of innovative ideas and recent advances in the field of communications.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 8","pages":"303-303"},"PeriodicalIF":0.7,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11640917","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148661814","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
Authorization-Based Relay Admission for Re-Bootstrap in AD HOC Networks 基于授权的AD HOC网络重引导中继准入
IF 0.7
IEICE Communications Express Pub Date : 2026-08-01 Epub Date: 2026-06-16 DOI: 10.23919/comex.2026XBL0078
Ryu Watanabe;Kouichi Sakurai
{"title":"Authorization-Based Relay Admission for Re-Bootstrap in AD HOC Networks","authors":"Ryu Watanabe;Kouichi Sakurai","doi":"10.23919/comex.2026XBL0078","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0078","url":null,"abstract":"Ad hoc multi-hop communication enables flexible connectivity but introduces challenges in securely joining the network without direct access to infrastructure. In such environments, nodes may frequently lose connectivity to an access point (AP) due to mobility or environmental factors, requiring efficient mechanisms to re-establish secure participation without overloading intermediate nodes. Prior work addressed proxy-assisted secure bootstrap using proxy nodes (PNs) and client puzzles to throttle request traffic. However, computational throttling is less suitable in modern environments due to increased processing capabilities and the resulting need for larger puzzle parameters to achieve comparable delays, leading to higher computational overhead and limited adaptability. This letter proposes an authorization-based relay admission scheme, in which an AP issues short-lived relay tokens to previously authenticated nodes to control PN-assisted forwarding during re-bootstrap attempts. A PN forwards a request only when a valid token is presented, while authentication and network admission remain AP-terminated. The proposed approach replaces computational throttling with authorization-based control, reducing unnecessary request propagation while preserving the original bootstrap architecture. Furthermore, the proposed scheme enables lightweight and policy-based control of relay usage without imposing additional computational burden on legitimate nodes.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 8","pages":"349-352"},"PeriodicalIF":0.7,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11568120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148661894","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
Theoretical Study on Relation Between Null Space of Array Weight and Fading Channel of MIMO with Null-Space Expansion 零空间展开MIMO阵列权值零空间与衰落信道关系的理论研究
IF 0.7
IEICE Communications Express Pub Date : 2026-08-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0069
Makoto Taromaru;Masaharu Abiru;Hidekazu Murata;Tatsuhiko Iwakuni;Daisei Uchida;Shuki Wai;Takafumi Fujita
{"title":"Theoretical Study on Relation Between Null Space of Array Weight and Fading Channel of MIMO with Null-Space Expansion","authors":"Makoto Taromaru;Masaharu Abiru;Hidekazu Murata;Tatsuhiko Iwakuni;Daisei Uchida;Shuki Wai;Takafumi Fujita","doi":"10.23919/comex.2026XBL0069","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0069","url":null,"abstract":"When a mobile terminal connected with MIMO moves in high speed, the channel capacity is degraded because each element of the channel matrix varies and deviates from the previous reference symbol (RS) and inter-stream or inter-user interference increases in multiuser MIMO. To overcome this problem, Iwakuni, et al. proposed null-space expansion (NSE) method, which forms null space, not only toward the interference channel at the newest RS but also toward those at the past RSs. In this letter, conditional probability density function (PDF) of the varied channel from the one obtained at the previous RS is derived theoretically assuming that each element of the channel matrix varies following i.i.d. (independently and identically distributed) Gaussian process. It is also shown that the expected value of the interfering channel obtained with the PDF is contained in the null space of the array weight by NSE.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 8","pages":"322-326"},"PeriodicalIF":0.7,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548541","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148661511","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 Resampler with Low Computational Complexity for Differential OFDM of Underwater Acoustic Communications 一种用于水声通信差分OFDM的低计算复杂度重采样器
IF 0.7
IEICE Communications Express Pub Date : 2026-08-01 Epub Date: 2026-06-16 DOI: 10.23919/comex.2026XBL0071
Takaaki Shimomura;Mitsuyasu Deguchi;Yukihiro Kida;Takuya Shimura;Hiroshi Kubo
{"title":"A Resampler with Low Computational Complexity for Differential OFDM of Underwater Acoustic Communications","authors":"Takaaki Shimomura;Mitsuyasu Deguchi;Yukihiro Kida;Takuya Shimura;Hiroshi Kubo","doi":"10.23919/comex.2026XBL0071","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0071","url":null,"abstract":"This paper proposes a resampler with small computational complexity for differential orthogonal frequency division multiplexing (OFDM) of underwater acoustic communications (UWACs). Although an ambiguity function (AF) method is widely used for resampling in UWACs, it cannot always estimate an appropriate resampling rate from the correlation power if synchronization words (SWs) are Zadoff-Chu (ZC) sequences. The proposed resampler excludes erroneous resampling rates thanks to a detected interval of the two successive SWs. This paper compares the performance of the resamplers based on the AF method, the proposed method and parallel blind resampler selection. Channel simulation results and shallow-water experimental ones demonstrate that the proposed resampler has excellent performance keeping small computational complexity.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 8","pages":"327-330"},"PeriodicalIF":0.7,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11568118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148661595","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 Preliminary Evaluation on Uplink Coverage Extension in Millimeter Wave Communication using Repeater with TTD Array 基于TTD阵列中继器的毫米波通信上行覆盖扩展初步评估
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0066
Masahiro Takigawa;Ryochi Kataoka;Issei Kanno;Takahiro Hayashi
{"title":"A Preliminary Evaluation on Uplink Coverage Extension in Millimeter Wave Communication using Repeater with TTD Array","authors":"Masahiro Takigawa;Ryochi Kataoka;Issei Kanno;Takahiro Hayashi","doi":"10.23919/comex.2026XBL0066","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0066","url":null,"abstract":"This paper presents the uplink coverage expansion effects achieved by employing relay stations equipped with true-time-delay (TTD) arrays in the millimeter wave band. While millimeter waves provide the advantage of wide bandwidth availability, they also suffer from significant propagation losses, making beamforming techniques using array antennas essential. However, for users located at geographically distant positions, it is necessary to switch beams temporally, which restricts throughput per user terminal and results in shortened uplink coverage. Recently, the focus has shifted to joint phase-time array (JPTA), which allows for the formation of frequency-dependent analog beams by integrating TTD circuits into the antenna elements of conventional phased array antennas, thus enabling the expansion of uplink coverage. Nevertheless, even with JPTA implemented at the base station, the extension of uplink coverage remains constrained in the millimeter wave band due to the impact of obstructions. Therefore, this paper provides a simplified evaluation of the uplink coverage expansion effects when applying JPTA in relay stations, comparing these effects with the coverage provided by traditional relay stations equipped with phased arrays.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"299-302"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548540","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442917","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
GNN-Based Double DQN with Truncated Noisy Networks for Accelerating ICT System Design 基于gnn的截断噪声双DQN加速ICT系统设计
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0011
Hiroyuki Hochigai;Yutaka Yakuwa;Natsuki Okamura;Takayuki Kuroda;Tianchen Zhou;Ikuko Eguchi Yairi
{"title":"GNN-Based Double DQN with Truncated Noisy Networks for Accelerating ICT System Design","authors":"Hiroyuki Hochigai;Yutaka Yakuwa;Natsuki Okamura;Takayuki Kuroda;Tianchen Zhou;Ikuko Eguchi Yairi","doi":"10.23919/comex.2026XBL0011","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0011","url":null,"abstract":"Automated ICT system design struggles with slow convergence because of large state spaces and sparse rewards. We propose a new framework that combines Double DQN with Truncated Noisy Networks to enhance learning stability. Double DQN helps prevent overestimating values, while truncated noise encourages more reliable exploration without destabilizing the GNN-based agent. Experimental results show this approach reduces the number of episodes needed for convergence by 22% compared to traditional methods. This indicates the approach's strong potential to significantly accelerate complex network configuration tasks.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"255-258"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548525","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442749","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
Multi-Expert Feature Fusion for Signal Out-of-Distribution Detection 基于多专家特征融合的信号超分布检测
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0048
Liliang Zhou;Huaming Ran;Jiahuang Yang;Rong Luo
{"title":"Multi-Expert Feature Fusion for Signal Out-of-Distribution Detection","authors":"Liliang Zhou;Huaming Ran;Jiahuang Yang;Rong Luo","doi":"10.23919/comex.2026XBL0048","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0048","url":null,"abstract":"Out-of-distribution (OOD) detection is critical for the reliable deployment of radio-frequency (RF) signal recognition systems, as novel signals may severely degrade performance. We propose a multi-expert framework that integrates time-, frequency-, and time-frequency-domain experts to construct a richer feature space. Within this space, a normalized Mahalanobis distance is employed to jointly assess feature similarity and cross-view consistency. This design enables more robust separation between known and unknown signals compared with single-domain approaches. Experiments on both a synthetic Automatic Modulation Recognition (AMR) dataset and a real-world Specific Emitter Identification (SEI) dataset show that our method significantly outperforms comparison approaches in OOD detection while maintaining high closed-set classification accuracy.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"290-294"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548531","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442843","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
Graph-Based Propagation Path Learning Method and its Application to Propagation Loss Estimation 基于图的传播路径学习方法及其在传播损失估计中的应用
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0060
Kazuki Yuasa;So Okada;Koichi Ichige;Tatsuya Nagao;Yoshiaki Amano
{"title":"Graph-Based Propagation Path Learning Method and its Application to Propagation Loss Estimation","authors":"Kazuki Yuasa;So Okada;Koichi Ichige;Tatsuya Nagao;Yoshiaki Amano","doi":"10.23919/comex.2026XBL0060","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0060","url":null,"abstract":"This letter proposes a graph-based method for estimating radio-wave propagation paths. Building-layout images are converted into graph structures, and a graph attention network (GAT) is trained to generate path images that represent reflection and diffraction routes. The estimated path images are then used as features for a neural-network-based path-loss estimator. Simulation results utilizing ray-tracing data show that the proposed method improves path-loss prediction accuracy compared to conventional convolutional neural network-based (CNN-based) approaches, thereby demonstrating the effectiveness of incorporating path information into propagation-loss estimation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"264-267"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548539","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442318","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
Ultra-Low Input Power Drivable IoT Wireless Sensor using Energy Harvesting from 2.45 GHz Wi-Fi 使用2.45 GHz Wi-Fi能量收集的超低输入功率可驱动物联网无线传感器
IF 0.7
IEICE Communications Express Pub Date : 2026-07-01 Epub Date: 2026-06-02 DOI: 10.23919/comex.2026XBL0050
Masato Wadahama;Kazuhiro Fujimori
{"title":"Ultra-Low Input Power Drivable IoT Wireless Sensor using Energy Harvesting from 2.45 GHz Wi-Fi","authors":"Masato Wadahama;Kazuhiro Fujimori","doi":"10.23919/comex.2026XBL0050","DOIUrl":"https://doi.org/10.23919/comex.2026XBL0050","url":null,"abstract":"This letter implements an ultra-low-power IoT wireless sensor driven by energy harvesting (EH) from 2.45 GHz Wi-Fi and verifies its performance. First, a planar Yagi-Uda antenna was used to extend transmission distance, and its maximum gain was 12.2 dBi. Next, a high-conversion-efficiency rectifier was implemented using surface-mount components to achieve ultra-low input power operation and achieved 15.7% conversion efficiency at −20 dBm input power. Finally, connecting these components to the sensor module enabled sensor operation at a distance of 3.0 m from the Wi-Fi router. This shows that the proposed IoT wireless sensor offers high flexibility and enables semi-permanent operation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"15 7","pages":"286-289"},"PeriodicalIF":0.7,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11548532","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442745","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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