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Three-Axis Coil Array for Null-Free Near-Field Tag Reading with UHF RFID 三轴线圈阵列用于超高频RFID无零近场标签读取
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0178
Akihito Noda
{"title":"Three-Axis Coil Array for Null-Free Near-Field Tag Reading with UHF RFID","authors":"Akihito Noda","doi":"10.23919/comex.2024XBL0178","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0178","url":null,"abstract":"Tiny radio-frequency identification (RFID) tags with a 1 mm square scale can be attached to small insects such as ants and used to detect their passage at RFID reader antennas in a laboratory arena. Although the movement paths of ants can be restricted inside a narrow tube, the ants pass through the tube in various postures. A single small coil antenna attached to the tube generates nulls, where the tags become unreadable due to specific tag orientations. This letter proposes a tag reading system with three antennas generating major magnetic field vectors in three orthogonal directions, to eliminate nulls within the tube, regardless of the tag orientation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"55-58"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799933","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107196","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
Discrete Wigner-Ville Distribution with Wide Frequency Observation Range 宽频率观测范围的离散Wigner-Ville分布
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0168
Tomoya Yamaoka;Tadashi Oshima
{"title":"Discrete Wigner-Ville Distribution with Wide Frequency Observation Range","authors":"Tomoya Yamaoka;Tadashi Oshima","doi":"10.23919/comex.2024XBL0168","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0168","url":null,"abstract":"The Wigner-Ville distribution (WVD) is a high-resolution time-frequency analysis method. However, the discrete WVD (DWVD) has the problem of a narrow frequency observation range. This is because the time sampling of the symmetric instantaneous auto-correlation function (SIAF) changes simultaneously in the positive and negative directions. As a result, the sampling period of the SIAF in the case of DWVD is doubled and the frequency observation range is halved. Therefore, we propose a DWVD that does not narrow the frequency observation range. Specifically, when deriving the SIAF, in addition to the conventional sample that varies in both the positive and negative directions, we consider a sample averaged over two samples that vary only in the positive or negative direction. The proposed process allows the DWVD to be performed without halving the frequency observation range. However, this process causes a small aliasing component, which can be reduced by the use of window functions. This study will demonstrate this effect by using the proposed method for chirp waveforms.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"67-70"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799926","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107199","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
Visible Light Communication Technology in Digital Operating Room: Experiment and Equipment Manufacturing 数字化手术室可见光通信技术：实验与设备制造
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0181
Xiaofei Wang;Chao Zhang;Jian Song
{"title":"Visible Light Communication Technology in Digital Operating Room: Experiment and Equipment Manufacturing","authors":"Xiaofei Wang;Chao Zhang;Jian Song","doi":"10.23919/comex.2024XBL0181","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0181","url":null,"abstract":"With the technology advances and implementation acceleration of medical digitization, more and more medical devices with radio frequency (RF) wireless communication capabilities are adopted in the hospitals for the conveniences and easily for the deployments. That causes the concerns on electromagnetic interference problem affecting medical safety seriously and should be considered carefully in reality. As an attractive technology, visible light communication (VLC) uses visible light offering illumination and communication at the same time. Compared with the traditional RF communication systems, VLC has significant advantages such as energy saving, easy deployment, no radio interference, electromagnetic compatibility and etc.. In this paper, the experiment utilizing VLC in the digital operating room to reduce electromagnetic interference is presented with implementation details on the test environment and both uplink and downlink hardware design and key parameters to support video/image transmission. The effectiveness of VLC system is verified to deploy in a real digital operating room and support in operation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"63-66"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799928","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107202","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
Occupancy Grid Map Estimation Method using Roadside Sensor for Cooperative Automated Driving 基于路边传感器的协同自动驾驶占用网格图估计方法
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0176
Shota Matsushita;Onur Alparslan;Kenya Sato
{"title":"Occupancy Grid Map Estimation Method using Roadside Sensor for Cooperative Automated Driving","authors":"Shota Matsushita;Onur Alparslan;Kenya Sato","doi":"10.23919/comex.2024XBL0176","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0176","url":null,"abstract":"In recent years, cooperative automated driving, which shares information from in-vehicle and roadside sensors via communication technology, has gained attention. To share sensor information, methods using occupancy grid maps (OGMs) have been explored. However, when using roadside sensors to estimate OGMs, which are installed at higher elevations than in-vehicle sensors, the challenge arises of being unable to accurately recognize the road environment due to increased undetected areas. This study proposed a method to estimate OGMs using roadside LiDAR sensors, considering undetected areas. And the proposed method was demonstrated to accurately reflect the road environment in OGMs.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"83-86"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799924","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107195","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 Complexity-Reduction Sub-Terahertz Image Sensing Method using Adaptive Signal Processing 一种基于自适应信号处理的复杂性降低亚太赫兹图像传感方法
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0187
Taisei Kurahashi;Eiji Okamoto
{"title":"A Complexity-Reduction Sub-Terahertz Image Sensing Method using Adaptive Signal Processing","authors":"Taisei Kurahashi;Eiji Okamoto","doi":"10.23919/comex.2024XBL0187","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0187","url":null,"abstract":"Terahertz-wave sensing is expected to be used for high-resolution metal detection because of its broadband nature and object transparency. However, when terahertz-band near-field image sensing is conducted using array antennas, the amount of signal processing increases significantly with the resolution. We propose a low-complexity imaging algorithm that changes the sensing resolution adaptively according to the area where an object may exist without compromising the object detection capability. Experimental results using actual measured data show that the proposed method reduces the computational complexity to less than one-third of that of conventional linear interpolation methods without degrading the quality of the sensed image.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"79-82"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107201","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
Beam Steering Realization using a Reflective Metasurface for THz Applications 太赫兹应用中使用反射元表面的波束导向实现
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0182
Liang-Yu Ou Yang;Siang-Cyun Liao;Bingzhang Tsai
{"title":"Beam Steering Realization using a Reflective Metasurface for THz Applications","authors":"Liang-Yu Ou Yang;Siang-Cyun Liao;Bingzhang Tsai","doi":"10.23919/comex.2024XBL0182","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0182","url":null,"abstract":"This paper presents a reflective metasurface designed for beam steering at 300 GHz. The metasurface uses an H-shaped structure as its unit cell to achieve desired reflection phases. A supercell, consisting of 16 unit cells, covers a complete reflection phase range of 360 degrees. To achieve a radiation pattern with the main beam directed at 30 degrees from the broadside direction, 28 supercells are fabricated on a grounded GaAs substrate of dimensions 4.4 mm × 4.4 mm. Full-wave simulations are conducted, demonstrating that the proposed metasurface achieves an overall gain of 10 dBi under a horn excitation. In addition, the radiation and transmission performance of the proposed metasurface over a long distance in a complex environment with multipath effects is proven to be effective. These results suggest that such metasurfaces have significant potential in THz applications.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"75-78"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799925","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107203","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 Conjunction with IEICE General Conference 2024 与IEICE大会2024相结合的特别集群
IF 0.3
IEICE Communications Express Pub Date : 2024-12-02 DOI: 10.23919/comex.2024COF0001
{"title":"Special Cluster in Conjunction with IEICE General Conference 2024","authors":"","doi":"10.23919/comex.2024COF0001","DOIUrl":"https://doi.org/10.23919/comex.2024COF0001","url":null,"abstract":"IEICE Communications Express (ComEX) has continued to issue a special cluster annually in conjunction with the IEICE General Conferences since 2019. This year's special cluster is based on the papers presented at the IEICE General Conference 2024, which was held at the Hiroshima University in March 2024. Since October 1, 2023, all accepted letters in ComEX have been published in IEEE Xplore to improve the visibility of letters.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 12","pages":"449-449"},"PeriodicalIF":0.3,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10772345","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761416","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
Intelligent Reflecting Surface Effect by Switching ±45° Incident Polarization in Outdoor Environment 室外环境下切换±45°入射偏振的智能反射面效应
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0138
Mayumi Yoshino;Doppo Sugimura
{"title":"Intelligent Reflecting Surface Effect by Switching ±45° Incident Polarization in Outdoor Environment","authors":"Mayumi Yoshino;Doppo Sugimura","doi":"10.23919/comex.2024XBL0138","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0138","url":null,"abstract":"Recently, Intelligent Reflecting Surface (IRS), which controls the direction of reflected waves in a desired direction, has been investigated to improve the wireless environment. This paper presents outdoor measurements using a prototype IRS that controls the direction of \u0000<tex>$pm 45^{circ}$</tex>\u0000 reflection by switching the incident polarization. The received power in each reflection direction was improved by more than 20 dB by placing the IRS, and the results using the IRS agreed well with the radar equation, indicating the effect of the IRS.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"26-29"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751761","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938578","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
Positioning System with MIMO Array and Digital Spatial Filter that Tracks Fixed Visible Lights 利用MIMO阵列和数字空间滤波器跟踪固定可见光的定位系统
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0145
Wataru Imajuku;Takanori Matsuzaki
{"title":"Positioning System with MIMO Array and Digital Spatial Filter that Tracks Fixed Visible Lights","authors":"Wataru Imajuku;Takanori Matsuzaki","doi":"10.23919/comex.2024XBL0145","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0145","url":null,"abstract":"This letter proposes a visible light indoor position tracker employing a newly developed Angle of Arrival (AOA) with Multiple Input Multiple Output (MIMO) channel model algorithm. The position tracker utilizes indoor illumination lights and a photodiode (PD) array. An adaptive digital spatial filter attached to the output of the PD array performs MIMO signal processing and decomposes the light signals received from different illumination light sources that are simultaneously input to the PD array. The position tracker then estimates the angle of arrival of each light signal and finally its position. This letter demonstrates a position tracker with an adaptive digital filter tunning the Least Mean Square (LMS) algorithm and evaluates its positioning error performance. Experiments show excellent performance as the positioning errors were as low as 0.05 m in an indoor environment with dimensions of \u0000<tex>$1.75times 2times 2 mathrm{m}$</tex>\u0000.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"22-25"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751751","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938584","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
Visualization of the Photoconductive Effect in Silicon Wafers Using Terahertz Imaging 利用太赫兹成像技术可视化硅片中的光导效应
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0141
Shiho Konokawa;Kazuaki Ishioka;Akinori Taira
{"title":"Visualization of the Photoconductive Effect in Silicon Wafers Using Terahertz Imaging","authors":"Shiho Konokawa;Kazuaki Ishioka;Akinori Taira","doi":"10.23919/comex.2024XBL0141","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0141","url":null,"abstract":"In this paper, we report the results of reflection imaging of silicon wafers using terahertz waves, aiming to achieve both high resolution and transparency in sensing technology. We compare the theoretical calculations of the transmittance of silicon wafers with the experimental results obtained through imaging. Through this study, we were able to confirm the frequency characteristics of silicon wafers using terahertz reflection imaging.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"5-7"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751762","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938582","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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