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Phase Retrieval Method Under Tilted Near-Field Conditions in 480 GHz Band 480 GHz倾斜近场条件下的相位恢复方法
IF 0.3
IEICE Communications Express Pub Date : 2025-11-14 DOI: 10.23919/comex.2025COL0012
Tomohiro Ishida;Nozomi Okada;Toshiyuki Nishibori
{"title":"Phase Retrieval Method Under Tilted Near-Field Conditions in 480 GHz Band","authors":"Tomohiro Ishida;Nozomi Okada;Toshiyuki Nishibori","doi":"10.23919/comex.2025COL0012","DOIUrl":"https://doi.org/10.23919/comex.2025COL0012","url":null,"abstract":"This study obtained the far-field radiation pattern of a reflector antenna from the near-field amplitude distribution using the Phase Retrieval (PR) method in the plane perpendicular to the axis tilted from the optical axis. The PR method usually uses the near-field amplitude distribution in the plane perpendicular to the optical axis of the antenna. However, due to the design of the measurement system and antenna, the measurements had to be made in a plane perpendicular to an axis tilted from the optical axis. Since the literature has not reported such cases, this study investigated the determination of phase retrieval from the near-field amplitude distribution in a tilted plane by simulation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"457-459"},"PeriodicalIF":0.3,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11249780","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665833","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
Further Investigation of Impact of Fading Correlation on Joint Transmit-Receive Diversity 衰落相关对联合收发分集影响的进一步研究
IF 0.3
IEICE Communications Express Pub Date : 2025-10-13 DOI: 10.23919/comex.2025XBL0101
Fumiyuki Adachi;Ryo Takahashi
{"title":"Further Investigation of Impact of Fading Correlation on Joint Transmit-Receive Diversity","authors":"Fumiyuki Adachi;Ryo Takahashi","doi":"10.23919/comex.2025XBL0101","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0101","url":null,"abstract":"In this paper, we derive analytical expressions for the cumulative distribution function (CDF) of channel capacity achievable by suboptimal joint transmit-receive diversity (JTRD) for perfectly correlated and uncor-related fading cases in a strongly asymmetric MIMO channel. The derived CDF of channel capacity is validated by Monte-Carlo numerical computation. It is confirmed that in a strongly asymmetric MIMO channel, the fading correlation has a favorable impact on suboptimal JTRD based on maximal-ratio diversity (MRD), while it only slightly degrades suboptimal JTRD based on selection diversity (SD). The fading correlation has also a favorable impact on optimal JTRD, which is confirmed by investigating the behavior of eigenmode transmission by using Monte-Carlo numerical computation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"460-463"},"PeriodicalIF":0.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11202644","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665729","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
DNN-Assisted Autocorrelation-Based Preamble Detection for Symbol Synchronization of Image Overlay Screen Camera Communication 基于dnn辅助自相关的图像覆盖屏相机通信符号同步前导检测
IF 0.3
IEICE Communications Express Pub Date : 2025-10-13 DOI: 10.23919/comex.2025XBL0116
Wataru Chujo;Keima Takechi;Hayate Ohtani;Kentaro Kobayashi
{"title":"DNN-Assisted Autocorrelation-Based Preamble Detection for Symbol Synchronization of Image Overlay Screen Camera Communication","authors":"Wataru Chujo;Keima Takechi;Hayate Ohtani;Kentaro Kobayashi","doi":"10.23919/comex.2025XBL0116","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0116","url":null,"abstract":"Image overlay uplink screen camera communication consists of a small screen with LED backlight modulation and a rolling shutter telephoto camera. In a previous study on symbol synchronization, object detection deep neural network (DNN) detected the screen, and autocorrelation detected the preamble separately. However, both object detection DNN and autocorrelation can detect the preamble. First, in this study, object detection DNN detects the screen and preamble. Next, autocorrelation precisely detects the preamble assisted with object detection DNN, improving the efficiency and accuracy of preamble detection. Also, preamble pattern suitable for object detection DNN is revealed.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"481-485"},"PeriodicalIF":0.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11202646","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665834","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
Automatic Modulation Classification based on Bayesian Learning 基于贝叶斯学习的自动调制分类
IF 0.3
IEICE Communications Express Pub Date : 2025-10-13 DOI: 10.23919/comex.2025XBL0088
Tsung-Cheng Wu
{"title":"Automatic Modulation Classification based on Bayesian Learning","authors":"Tsung-Cheng Wu","doi":"10.23919/comex.2025XBL0088","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0088","url":null,"abstract":"This study applies Bayesian learning techniques, specifically Variational Inference (VI) and Monte Carlo Dropout (MC Dropout) to Automatic Modulation Classification (AMC). Both methods are built upon a Convolutional Neural Network (CNN) framework and are capable of detecting certain out-of-domain (OOD) modulations through threshold-based decision making. The results indicate that the confidence scores assigned to OOD modulations are influenced by their proximity to the trained indomain classes. Higher confidence scores are typically observed for modulation types that closely resemble known modulation classes. This approach enables effective classification by training only on essential modulation types, thereby reducing the need for exhaustive class coverage and supporting the constraints of edge computing environments.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"477-480"},"PeriodicalIF":0.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11202647","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665798","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
Impact of EEPN in Phase-Sensitively Pre-Amplified Fiber-Optic Transmission with Digital Idler Generation and Pre-CD Compensation EEPN对带数字闲散产生和预cd补偿的相敏预放大光纤传输的影响
IF 0.3
IEICE Communications Express Pub Date : 2025-10-13 DOI: 10.23919/comex.2025XBL0121
Shimpei Shimizu;Atsushi Okamoto
{"title":"Impact of EEPN in Phase-Sensitively Pre-Amplified Fiber-Optic Transmission with Digital Idler Generation and Pre-CD Compensation","authors":"Shimpei Shimizu;Atsushi Okamoto","doi":"10.23919/comex.2025XBL0121","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0121","url":null,"abstract":"This study investigates the effect of equalization-enhanced phase noise (EEPN) on fiber-optic transmission systems that employ a phase-sensitive amplifier (PSA) based on double-sideband (DSB) modulation. The DSB-PSA scheme enables digital chromatic dispersion (CD) pre-compensation, facilitating the universal deployment of phase-sensitive pre-amplification; however, this process introduces EEPN. Through spectral analysis and visualization, we show that EEPN can be mitigated by phase-sensitive amplification and manifests as frequency-dependent coherent gain fluctuations. Numerical simulations with a 96-Gbaud 16QAM signal confirmed that the PSA significantly improves signal quality, even under severe EEPN conditions with large laser linewidths and/or high CD values.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"473-476"},"PeriodicalIF":0.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11202642","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665797","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 Metasurface Implementing Phased-Array-based Vortex Beam Divergence Control for Generating Four-Channel Equal Divergence Angle Vortex Beams 一种实现相控阵涡束发散控制的超表面，用于产生四通道等发散角涡束
IF 0.3
IEICE Communications Express Pub Date : 2025-10-13 DOI: 10.23919/comex.2025XBL0114
Zhiwei Wang;Yongzhong Zhu;Junwei Xu;Hanchu Zhou;Wenxuan Xie
{"title":"A Metasurface Implementing Phased-Array-based Vortex Beam Divergence Control for Generating Four-Channel Equal Divergence Angle Vortex Beams","authors":"Zhiwei Wang;Yongzhong Zhu;Junwei Xu;Hanchu Zhou;Wenxuan Xie","doi":"10.23919/comex.2025XBL0114","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0114","url":null,"abstract":"This paper proposes a dual-frequency polarization-multiplexed metasurface for Orbital angular momentum (OAM) divergence control using phased-array principles. Compared to FSS-Ioaded designs, the unit achieves ultrathin profile, full-phase coverage, and angle insensitivity. By implementing phased-array-based divergence tuning, we demonstrate four-channel high-purity vortex beams with equal divergence angles across modes. Fabricated prototypes validate the OAM control capability, showing good agreement between simulated and measured results. The design shows strong potential for vortex-beam communications and radar detection.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"464-468"},"PeriodicalIF":0.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11202643","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665730","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
Task-Aware Module Operation in IoT Gateways Enabling Power and Temperature Reduction for Power-over-Fiber Application 物联网网关中的任务感知模块操作，为光纤供电应用降低功耗和温度
IF 0.3
IEICE Communications Express Pub Date : 2025-10-13 DOI: 10.23919/comex.2025XBL0110
Suguru Yamaoka;Masaki Mizuno;Youichi Fukada;Ryo Miyatake;Yoshihito Sakai;Masayoshi Sekiguchi;Tatsuya Shimada
{"title":"Task-Aware Module Operation in IoT Gateways Enabling Power and Temperature Reduction for Power-over-Fiber Application","authors":"Suguru Yamaoka;Masaki Mizuno;Youichi Fukada;Ryo Miyatake;Yoshihito Sakai;Masayoshi Sekiguchi;Tatsuya Shimada","doi":"10.23919/comex.2025XBL0110","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0110","url":null,"abstract":"To reduce the risks of natural disasters, proactive use of environmental data is important. However, securing electricity in rural areas is often challenging. Thus, IoT gateways powered by power-over-fiber (PoF) are required. In this work, we develop an intermittent IoT gateway by implementing a task-aware module operation algorithm suitable for intermittent IoT sensing with power-limited PoF. The algorithm selectively powers the necessary modules and minimizes their operating time during the active state. As a result, power consumption in the active state is reduced by 56% compared with previous work, in which almost all modules were activated. Furthermore, the algorithm suppresses the temperature increase of the transmitter, one of the most power-hungry modules, by ~ 11K.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"469-472"},"PeriodicalIF":0.3,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11202645","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665796","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 and Visualization of QUIC Protocol Deployment in Vietnam 越南QUIC协议部署分析与可视化
IF 0.3
IEICE Communications Express Pub Date : 2025-09-10 DOI: 10.23919/comex.2025XBL0091
Thanh Trung Nguyen;Minh Hai Vu;Phi Le Nguyen;Kien Nguyen
{"title":"Analysis and Visualization of QUIC Protocol Deployment in Vietnam","authors":"Thanh Trung Nguyen;Minh Hai Vu;Phi Le Nguyen;Kien Nguyen","doi":"10.23919/comex.2025XBL0091","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0091","url":null,"abstract":"Quick UDP Internet Connections (QUIC), an advanced IETF transport-layer protocol, offers several significant advantages over traditional TCP, including reduced latency, enhanced multiplexing capabilities, and strong security through built-in encryption and optimized handshake processes. Because of these benefits, even before its standardization in 2021, QUIC was widely deployed by major Internet companies such as Google and Facebook. Additionally, previous research has observed an increase in global adoption of QUIC. Motivated by this trend, we investigate QUIC deployment in Vietnam, particularly in the context of the country's rapid development, especially in the ICT sector. Specifically, we scan and analyze QUIC adoption using a Vietnamese IPv4 dataset. The scanning results indicate that QUIC adoption in Vietnam is in the early stages, with a low deployment rate of approximately 0.05% of all Vietnamese IPv4 addresses. Furthermore, we analyze active migration support, TLS encryption preferences, and visualize a map of QUIC adoption to track its ongoing deployment patterns. In addition, we conduct active measurements showing that QUIC achieves lower time to first byte (TTFB) and higher throughput than TCP in Wi-Fi networks, while offering competitive performance in mobile networks.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 11","pages":"415-418"},"PeriodicalIF":0.3,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11157906","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145674831","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 Modeling and Interference Prevention of Light Trails for LED-Propeller Based Image Sensor Communication 基于led -螺旋桨的图像传感器通信光迹的理论建模与抗干扰
IF 0.3
IEICE Communications Express Pub Date : 2025-09-10 DOI: 10.23919/comex.2025COL0011
Shin Asaoka;Shan Lu;Takaya Yamazato;Zhengqiang Tang
{"title":"Theoretical Modeling and Interference Prevention of Light Trails for LED-Propeller Based Image Sensor Communication","authors":"Shin Asaoka;Shan Lu;Takaya Yamazato;Zhengqiang Tang","doi":"10.23919/comex.2025COL0011","DOIUrl":"https://doi.org/10.23919/comex.2025COL0011","url":null,"abstract":"A propeller LED transmitter (P-Tx) further boosts image sensor communication (IS C) throughput by mounting LEDs on a rotating arm and encoding data via their On/Off state. Reducing the angular interval per bit increases data rate but also raises the risk of overlapping “light trails” and ensuing interference. To date, no analytical model has linked the control angle to inter-trail interference in P-Tx-based ISC. This paper proposes a fundamental model of light trail generation and blinking control conditions to prevent interference between adjacent light trails. In the proposed model, the luminous energy distribution on the image plane is calculated based on the LED rotation trajectory. We also provide preliminary experimental results to validate the proposed model.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 12","pages":"436-440"},"PeriodicalIF":0.3,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11157908","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145665817","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
OLSR-Based UAV Route Construction Method with Reservation of in-Flight and Crossing Links 基于olsr的无人机航路构建方法
IF 0.3
IEICE Communications Express Pub Date : 2025-09-10 DOI: 10.23919/comex.2025XBL0095
Akito Maeda;Kiyoshi Ueda;Takumi Miyoshi;Taku Yamazaki;Ryo Yamamoto
{"title":"OLSR-Based UAV Route Construction Method with Reservation of in-Flight and Crossing Links","authors":"Akito Maeda;Kiyoshi Ueda;Takumi Miyoshi;Taku Yamazaki;Ryo Yamamoto","doi":"10.23919/comex.2025XBL0095","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0095","url":null,"abstract":"Unmanned aerial vehicles (UAVs) are attracting attention for applications such as delivery services. In dense UAV traffic, efficient route management is critical for safe navigation. We previously proposed a distributed UAV management system based on a virtual circuit concept, where UAV routes are established over a multi-hop wireless network formed by devices installed in individual houses. To avoid collisions, the system reserves both UAV routes and their crossing links. However, as the number of UAVs increases, link availability decreases, leading to frequent route construction failures. This letter proposes an improved method that reserves only the links currently used by UAVs in flight and their crossing links. Simulation results confirm the effectiveness of the proposed method.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 11","pages":"390-392"},"PeriodicalIF":0.3,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11157911","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145674755","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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