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Machine Learning-Based Object Movement Prediction Method Using Occupancy Grid Maps from Roadside Sensor 基于机器学习的路边传感器占用网格地图物体运动预测方法
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025XBL0005
Shota Matsushita;Onur Alparslan;Kenya Sato
{"title":"Machine Learning-Based Object Movement Prediction Method Using Occupancy Grid Maps from Roadside Sensor","authors":"Shota Matsushita;Onur Alparslan;Kenya Sato","doi":"10.23919/comex.2025XBL0005","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0005","url":null,"abstract":"For automated vehicles, wide-ranging and real-time detection of the surrounding environment and accurate recognition of objects, including pedestrians, vehicles, and their movements, are crucial. In previous work, we proposed a method for estimating road environments as an occupancy grid map (OGM) using roadside sensors. However, OGMs independently calculate occupancy probabilities for each cell, which poses a challenge in accounting for the movement of objects across cells. This study proposed a machine learning-based method for predicting future OGMs, using OGMs from roadside LiDAR sensors. Real-world evaluations demonstrated that the proposed method predicts object movement with short execution times.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"189-192"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924592","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896461","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
Segmentation-Driven Incremental Learning for Accurate Network Traffic Prediction 分段驱动的增量学习，用于准确的网络流量预测
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2024XBL0210
Erina Takeshita;Tomoya Kosugi
{"title":"Segmentation-Driven Incremental Learning for Accurate Network Traffic Prediction","authors":"Erina Takeshita;Tomoya Kosugi","doi":"10.23919/comex.2024XBL0210","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0210","url":null,"abstract":"This study proposes a novel data segmentation method for incremental learning in network traffic prediction, leveraging change points in network configuration data (e.g., the number of users and network equipment). Isolating high-variance segments improves the incremental learning performance. Existing methods such as the PELT algorithm in ruptures face challenges in isolating high-variance segments and have the disadvantage of high computational costs. In contrast, the proposed method efficiently identifies high-variance segments by leveraging network configuration data as segmentation criteria. This approach not only circumvents the computational costs associated with parameter tuning but also facilitates more effective isolation of high-variance segments, leading to improved segmentation accuracy. Experiments show an average MSE of 1.799, outperforming baseline methods (No Segmentation: 2.846, RPT: 2.653) and enhancing prediction accuracy.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"170-173"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924591","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896334","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
Quantitative Evaluation of Effect of Quality of Service Deterioration in Time Synchronization Message Transmission on Synchronization Accuracy Over Ethernet-Based in-Vehicle Network 基于以太网的车载网络时间同步消息传输服务质量恶化对同步精度影响的定量评价
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2024XBL0212
Maika Koizumi;Yoshihiro Ito
{"title":"Quantitative Evaluation of Effect of Quality of Service Deterioration in Time Synchronization Message Transmission on Synchronization Accuracy Over Ethernet-Based in-Vehicle Network","authors":"Maika Koizumi;Yoshihiro Ito","doi":"10.23919/comex.2024XBL0212","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0212","url":null,"abstract":"This paper evaluates the effect of the Quality of Service (QoS) degradation in time synchronization messages on the time synchronization accuracy over Ethernet-based in-vehicle networks with IEEE 802.1AS. In in-vehicle networks, congestion between the timeTransmitter and timeReceiver can reduce the time synchronization accuracy since the time synchronization is performed based on the link delay measurement in IEEE 802.1AS. However, the quantitative relationship between the time synchronization accuracy and QoS of the message transmission is unclear. This paper evaluates the QoS degradation and the synchronization accuracy under actual experimental networks. The results show that the Neighbor Rate Ratio and the standard deviation of Packet Delay Variation significantly influence the time synchronization accuracy.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"177-180"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924595","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896429","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
Characterization of m × n Metasurface for Bandwidth Extension of Patch Antennas 贴片天线带宽扩展的m × n元表面表征
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025SPL0016
Naoto Tomiyama;Hiroyuki Arai
{"title":"Characterization of m × n Metasurface for Bandwidth Extension of Patch Antennas","authors":"Naoto Tomiyama;Hiroyuki Arai","doi":"10.23919/comex.2025SPL0016","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0016","url":null,"abstract":"Patch antennas have been drawn rich attention in wireless system because of their low-profile structure, low cost and ease of manufacture. This paper discusses characterization of <tex>$mathrm{m} times mathrm{n}$</tex> meta surface for patch antenna in terms of bandwidth enhancement. To clarify the principle of operation of the periodic part, we focused on magnetic currents. As a result, it is found that at the design frequency of the periodic structure, both the patch and the periodic structure radiate. It was also found that the effect of elements not adjacent to the driving element was greater, radiating out-of-phase components.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"226-228"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924589","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196567","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
Optical Filtering Tolerance of Single-Sideband Modified Duobinary Transmission with Maximum Likelihood Sequence Estimation 基于最大似然序列估计的单边带改进双二进制传输光滤波容限
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0209
Tetsuya Nagaoka;Akihide Sano
{"title":"Optical Filtering Tolerance of Single-Sideband Modified Duobinary Transmission with Maximum Likelihood Sequence Estimation","authors":"Tetsuya Nagaoka;Akihide Sano","doi":"10.23919/comex.2024XBL0209","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0209","url":null,"abstract":"This paper proposes to use single-sideband modified duobinary (SSB-MDB) signaling in order to improve cascaded filtering tolerance in metro optical networks. The SSB-MDB signal is detected by using Kramers- Kronig (KK) reception scheme, and maximum likelihood sequence estimation (MLSE) is employed to improve the transmission performance. We show that the SSB-MDB has superior filtering tolerance compared with the 16-ary quadrature amplitude modulation (16QAM) with the same bit rate when the CW tone for KK reception is multiplexed at the receiver side.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"127-130"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808855","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
Non-Orthogonal HARQ for UAV-Aided THz Systems: Design and Analysis 无人机辅助太赫兹系统的非正交HARQ：设计与分析
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025XBL0006
Trung D. Nguyen;Chuyen T. Nguyen;Hoang D. le;Anh T. Pham
{"title":"Non-Orthogonal HARQ for UAV-Aided THz Systems: Design and Analysis","authors":"Trung D. Nguyen;Chuyen T. Nguyen;Hoang D. le;Anh T. Pham","doi":"10.23919/comex.2025XBL0006","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0006","url":null,"abstract":"This letter addresses the error-control design for unmanned aerial vehicles (UAV)-aided Terahertz (THz) systems. Particularly, we propose the design of a non-orthogonal chase combining hybrid automatic repeat request (N-CC-HARQ) scheme, where the retransmission request is served together with the new frame through a nonorthogonal signal su-perposition within the same time slot. The performance of the proposed N-CC-HARQ is evaluated over the THz channels incorporating path loss, fading, and pointing misalignment. Different performance metrics, including frame error rate (FER), Goodput, and energy efficiency, are analytically obtained based on the Markov model. Numerical results confirm the effectiveness of the proposed N-CC-HARQ schemes over the state-of-the-art.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"151-154"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904082","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808894","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
Optimization Effects of Rotating Transmitarray for Direction-of-Arrival Estimation with a Single Antenna 旋转发射阵在单天线到达方向估计中的优化效果
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025SPL0007
Ryusuke Sunagawa;Hibiki Shiiba;Makoto Sano;Ryuji Kuse;Takeshi Fukusako
{"title":"Optimization Effects of Rotating Transmitarray for Direction-of-Arrival Estimation with a Single Antenna","authors":"Ryusuke Sunagawa;Hibiki Shiiba;Makoto Sano;Ryuji Kuse;Takeshi Fukusako","doi":"10.23919/comex.2025SPL0007","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0007","url":null,"abstract":"This paper discusses the optimization effects of a transmitarray on a direction-of-arrival (DOA) estimation using the transmitarray and a single receiving antenna. The transmitarray consists of 1-bit elements with 0° and 180° transmission phases. The transmission phase distribution was optimized using a genetic algorithm and compared to a random distribution. The optimized transmitarray achieves a DOA estimation accuracy comparable to that of a conventional system using a 3-element linear array antenna. The root mean square error (RMSE) of the optimized system exhibits a decreasing trend as the signal-to-noise ratio (SNR) increases. Notably, at an SNR of 20 dB, the RMSE is 20° lower than that of the 3-element linear array antenna.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"210-213"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196626","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 Null-Steering Antenna for Accurate Localization with the Internet of Things 一种用于物联网精确定位的零转向天线
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025SPL0002
Jo Tamura;Hiroyuki Arai
{"title":"A Null-Steering Antenna for Accurate Localization with the Internet of Things","authors":"Jo Tamura;Hiroyuki Arai","doi":"10.23919/comex.2025SPL0002","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0002","url":null,"abstract":"This paper presents an antenna design for indoor positioning systems with the Internet of Things (IoT). The problem of direction-finding using a small array antenna with IoT devices is discussed. Theoretical studies clarify the limitations and challenges of using a null to estimate locations accurately and reduce antenna size and cost. Most importantly, electronic null-steering causes fluctuation in null-forming accuracy due to amplitude errors in the antennas and feeding circuits. This article experimentally demonstrates that this deviation error is suppressed using two copper wires and a suitable feeding circuit. The methods are feasible for practice as complicated corrections, such as amplitude controlling or signal processing, are excluded. The prototype steers a null with an angular resolution better than 4° within <tex>${pm} 60^{circ}$</tex>, verifying the simulated results.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"214-217"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904083","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196913","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
Waveguide $3times 2$ -Slot Subarray Antenna for Millimeter-Wave Car Radar 用于毫米波汽车雷达的波导3 × 2$槽子阵列天线
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0211
Ryosuke Sakurai;Jiro Hirokawa;Takashi Tomura
{"title":"Waveguide $3times 2$ -Slot Subarray Antenna for Millimeter-Wave Car Radar","authors":"Ryosuke Sakurai;Jiro Hirokawa;Takashi Tomura","doi":"10.23919/comex.2024XBL0211","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0211","url":null,"abstract":"We design a <tex>$3times 2$</tex> -slot sub array antenna for millimeter-wave car radars in the 76 GHz band. A cavity is introduced and designed to reduce phase differences among the slots. We change the slot length, width, and spacing to improve the gain. The antenna is designed for a wide bandwidth to have double resonance by two reflection-suppressing walls in the feeding part. The measured antenna has a reflection below -10 dB across 76.4 GHz-82.0 GHz. The gain is 15.5 dBi and the sidelobe level is -15.5 dB at 78.5 GHz in the measurement.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"155-158"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808984","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
Throughput Performance of THz-Enabled UAV Systems Using NOMA-HARQ with Imperfect CSI 基于不完全CSI下NOMA-HARQ的太赫兹无人机系统吞吐量性能研究
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0206
Trung D. Nguyen;Chuyen T. Nguyen;Hoang D. le;Anh T. Pham
{"title":"Throughput Performance of THz-Enabled UAV Systems Using NOMA-HARQ with Imperfect CSI","authors":"Trung D. Nguyen;Chuyen T. Nguyen;Hoang D. le;Anh T. Pham","doi":"10.23919/comex.2024XBL0206","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0206","url":null,"abstract":"This letter addresses the performance of the unmanned aerial vehicle (UAV)-aided multi-user terahertz (THz) systems using non-orthogonal multiple access (NOMA) and hybrid automatic repeat request (HARQ) protocols. Specifically, the total achievable throughput performance is analyzed over the THz channels, incorporating path-loss, small-scale fading characterized by the <tex>$a$</tex> - μ model, and fog attenuation. Notably, the imperfect channel-state information (CSI) is also considered. Simulation results demonstrate that the HARQ-aided NOMA-THz-based UAV systems can achieve a significant throughput performance enhancement compared to the state-of-the-art solutions. Moreover, proper parameter selection for HARQ-aided NOMA-THz-based UAV systems is also provided.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"131-134"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808983","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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