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Cross-Correlation Enhancement with GNSS-Derived SPM-Delay Using Azimuth Angle Filtering Towards Dust and Sandstorm Detection in Japan 基于方位角滤波的gnss spm延迟相互关联增强对日本沙尘和沙尘暴的探测
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025XBL0010
Rin Tokunaga;Takeshi Higashino
{"title":"Cross-Correlation Enhancement with GNSS-Derived SPM-Delay Using Azimuth Angle Filtering Towards Dust and Sandstorm Detection in Japan","authors":"Rin Tokunaga;Takeshi Higashino","doi":"10.23919/comex.2025XBL0010","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0010","url":null,"abstract":"This letter proposes the application of the precise point positioning (PPP) technique used in the GNSS for detecting the dust and sandstorm (DSS) in the atmosphere. Many of the papers have reported that the GNSS-derived zenith total delay (ZTD) is affected to aerosols and sandstorms, however, directivity for arrival angles of sandstorms is not considered. Since the suspended particulate matter (SPM) including the yellow sand and PM2.5 usually comes from the west side from Japan, azimuthal angle filtering is introduced in the process of estimation of the ZTD. The enhancement in the cross-correlation between the proposed SPM-induced delay and measured time series of the ground SPM has shown.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"143-146"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808856","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
Prediction of Shadowing Gain of 2D Object by Mirror Kirchhoff Approximation With Unequal Interval 用不等间隔镜像Kirchhoff近似预测二维物体遮挡增益
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0201
De Run Zhou;Xin Du;Hang Song;Jun-ichi Takada
{"title":"Prediction of Shadowing Gain of 2D Object by Mirror Kirchhoff Approximation With Unequal Interval","authors":"De Run Zhou;Xin Du;Hang Song;Jun-ichi Takada","doi":"10.23919/comex.2024XBL0201","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0201","url":null,"abstract":"Mirror Kirchhoff approximation (MKA) is a technology to quantify the shadowing effect in the 5<sup>th</sup> generation mobile communication systems. However, the conventional MKA using equal interval segmentation is inefficient in computation time since it does not consider the change in the slope of the shadowing object. In this letter, the unequal interval mirror Kirchhoff approximation (UMKA) is proposed to reduce computation time. In the proposal, the unequal internal is designed concerning the change in the slope of the object. The proposed method is validated for circular and elliptical conductor cylinders, which are considered to model the cross-section of the human body. The results show that UMKA achieves less computation time than the conventional MKA in the acceptable error range.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"119-122"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808857","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
Flexible and Efficient Resource Allocation Method Based on the Number of Transmit Antennas in Hybrid Multiple Access Scheme Using NOMA and OMA 基于NOMA和OMA混合多址方案中发射天线数量的灵活高效资源分配方法
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0203
Nozomi Sasaki;Shuhei Saito;Hirofumi Suganuma;Fumiaki Maehara
{"title":"Flexible and Efficient Resource Allocation Method Based on the Number of Transmit Antennas in Hybrid Multiple Access Scheme Using NOMA and OMA","authors":"Nozomi Sasaki;Shuhei Saito;Hirofumi Suganuma;Fumiaki Maehara","doi":"10.23919/comex.2024XBL0203","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0203","url":null,"abstract":"Non-orthogonal multiple access (NOMA), which multiplexes users in the power domain, degrades performance when the channel gain difference between users is small. To mitigate the performance degradation specific to NOMA, a hybrid multiple access scheme that simultaneously utilizes NOMA and orthogonal multiple access (OMA) is effective. So far, we have proposed a resource allocation method that allows for flexible settings of the NOMA power allocation ratios and OMA bandwidths and selects the optimal resource pattern based on the users' channel conditions and desired traffic volumes. In this study, we propose a resource pattern reduction method to reduce the cost of resource allocation in the conventional method by focusing on the applicability of NOMA and OMA, which depend on the number of transmit antennas. Furthermore, to clarify the effectiveness of the proposed method, we compared it with a conventional method that performs high-granularity resource allocation for different power ratios and bandwidths in terms of the system throughput.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"135-138"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808985","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
Nonlinearity Tolerance of Hierarchical Distribution Matching in Optical Fiber Communication 光纤通信中分层分布匹配的非线性容限
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0202
Mamoru Komatsu;Akira Naka
{"title":"Nonlinearity Tolerance of Hierarchical Distribution Matching in Optical Fiber Communication","authors":"Mamoru Komatsu;Akira Naka","doi":"10.23919/comex.2024XBL0202","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0202","url":null,"abstract":"This letter reports the nonlinearity tolerance properties of hier-archical distribution matching (HiDM), which is a distribution matcher of reasonable complexity for probabilistic amplitude shaping (PAS) in non-linear fiber-optic transmission. Recent studies have demonstrated that PAS exhibits unique nonlinearity tolerance, which varies depending on channel conditions. This tolerance is influenced by the choice of distribution matcher, as analyzed using statistical moments. In this work, we explore the nonlinearity tolerance of HiDM through moment-based analysis and numerical simulations. The results show that the dependence on blocklength in nonlinearity tolerance of HiDM is significantly smaller than in one of enumerative sphere shaping, a common DM. In addition, the property in HiDM is almost independent on the number of layers.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"123-126"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904087","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808982","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-Carrier FM Transmitter for Distributed Vibrators on Conductive Textile 导电织物上分布式振动器的多载波调频发射机
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0213
Takuto Yoshimoto;Akihito Noda
{"title":"Multi-Carrier FM Transmitter for Distributed Vibrators on Conductive Textile","authors":"Takuto Yoshimoto;Akihito Noda","doi":"10.23919/comex.2024XBL0213","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0213","url":null,"abstract":"This paper addresses issues in realizing a whole-body tactile display system. Individual wiring for each actuator requires many wires and presents a dilemma of durability and flexibility. Wireless transmission can eliminate these wires; however, practical wireless power supply to drive actuators is not currently available. Two-dimensional (2-D) communications on conductive textiles enable DC supply and data transfer while suppressing interference with other radio communications. Previously, a concept of multi-carrier frequency modulation (FM)-based vibrotactile waveform transmission on conductive textiles has been presented. However, practical implementations, in particular how to implement realtime multi-carrier FM, have not been clarified. In this paper, we propose a software-defined radio (SDR)-based multi-carrier FM transmitter capable of transmitting non-preprogrammed arbitrary waveforms of vibrotactile sensation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"159-162"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808895","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
Center-Feed Post-Wall Waveguide Series-Feed Sidelobe-Suppression Slot Subarray for Millimeter-Wave Radar 毫米波雷达中心馈电后壁波导系列馈电旁瓣抑制槽子阵列
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025XBL0009
Hayato Sato;Jiro Hirokawa;Takashi Tomura
{"title":"Center-Feed Post-Wall Waveguide Series-Feed Sidelobe-Suppression Slot Subarray for Millimeter-Wave Radar","authors":"Hayato Sato;Jiro Hirokawa;Takashi Tomura","doi":"10.23919/comex.2025XBL0009","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0009","url":null,"abstract":"We design a center-feed post-wall waveguide slot subarray of 25 radiating elements that suppresses E-plane sidelobes below -18 dB for the 76.5 GHz band (76.0 GHz to 77.0 GHz). First, by adjusting the dimension of the feeding aperture, the feeding part is designed to suppress reflection. Then, the slot lengths and post positions are adjusted, and the radiating elements are designed so that the excitation distribution calculated from the Taylor distribution is obtained. The overall structure is analyzed by combining the radiating part, in which the radiating elements are arranged so that their excitation phase distribution is uniform, and the feeding part. A prototype is fabricated and measured based on the design. The reflection is below -10 dB in a range of 74.1 GHz to 76.4 GHz for the calculated value and 74.5 GHz to 76.5 GHz for the experimental value. The sidelobe levels are sufficiently suppressed below -18 dB from 76.0 GHz to 76.6 GHz in both analysis and experiment.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"147-150"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808853","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
Experimental Evaluation of the Impact of Physical Space Information on Wireless Link Quality Estimation 物理空间信息对无线链路质量估计影响的实验评估
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025XBL0012
Kahoko Takahashi;Hisashi Nagata;Riichi Kudo;Takahiro Yamazaki;Takayuki Yamada;Takafumi Fujita
{"title":"Experimental Evaluation of the Impact of Physical Space Information on Wireless Link Quality Estimation","authors":"Kahoko Takahashi;Hisashi Nagata;Riichi Kudo;Takahiro Yamazaki;Takayuki Yamada;Takafumi Fujita","doi":"10.23919/comex.2025XBL0012","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0012","url":null,"abstract":"Predicting wireless link quality (LQ) is a promising approach to enhancing Quality of Experience (QoE). This paper examines the impact of physical space on LQ; it uses machine learning to predict RSSI and throughput from physical space information. Experiments show that the position/orientation of user equipment (UE) are crucial, with orientation affecting RSSI, and velocity significantly impacting throughput. It is revealed that these LQ parameters have different spatial factor dependencies. An experiment is conducted in a static indoor environment with clear line of sight to simplify the problem. We focus on deriving LQ from current physical space information rather than forecasting future quality.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"163-166"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808981","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
Pre-Equalized MIMO Transmission Over Analog RoF Downlink in the Pres-Ence of Gain Imbalance 增益不平衡下模拟RoF下行链路上的预均衡MIMO传输
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0207
Hiroto Yorioka;Takeshi Higashino;Minoru Okada
{"title":"Pre-Equalized MIMO Transmission Over Analog RoF Downlink in the Pres-Ence of Gain Imbalance","authors":"Hiroto Yorioka;Takeshi Higashino;Minoru Okada","doi":"10.23919/comex.2024XBL0207","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0207","url":null,"abstract":"In this article, we propose a pre-equalization method in a wired-wireless multiple-input and multiple-output (MIMO) transmission over an analog radio-on-fiber (A-RoF) network. The MIMO transmission based on A-RoF suffers from un-flat and unbalanced response in the wired part, re-sulting in decreased channel capacity. A partial pre-equalization technique for wired part is compared to the one for the joint channels of wired-and-wireless by using 2 x 2 transmission of orthogonal frequency division multiplexing (OFDM) in a 5-GHz band testbed.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"139-142"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808854","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
Experimental Study on Polarimetric Filtering in Ocean Radar 海洋雷达极化滤波的实验研究
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025SPL0005
Akira Matsuda;Hiroyoshi Yamada;Satoshi Fujii;Yasunori Osana;Takuji Arima;Toru Uno
{"title":"Experimental Study on Polarimetric Filtering in Ocean Radar","authors":"Akira Matsuda;Hiroyoshi Yamada;Satoshi Fujii;Yasunori Osana;Takuji Arima;Toru Uno","doi":"10.23919/comex.2025SPL0005","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0005","url":null,"abstract":"An ocean radar can retrieve information about surface currents and wave heights from the first- and second-order scattering caused by Bragg scattering. However, when the spectra of the first- and second-order scattering overlap with the signal from an aircraft target, accurately determining the first- and second-order scattering values becomes challenging. To effectively observe the ocean wave, it is necessary to suppress the aircraft target signal and to enhance the ocean wave signal. Conversely, for the multipurpose application of ocean radar, such as detecting moving targets like aircraft, the suppression of the ocean wave signal and enhancement of the aircraft target signal are required. This paper demonstrates, through experimental results, that polarimetric filtering can be applied in ocean radar to selectively enhance or suppress the desired signal.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"206-209"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196691","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 on Antennas and Propagation Technologies in Conjunction with Main Topics of iWAT 2024 结合iWAT 2024主要议题的天线和传播技术专题讨论会
IF 0.3
IEICE Communications Express Pub Date : 2025-01-30 DOI: 10.23919/comex.2024ATF0001
{"title":"Special Cluster on Antennas and Propagation Technologies in Conjunction with Main Topics of iWAT 2024","authors":"","doi":"10.23919/comex.2024ATF0001","DOIUrl":"https://doi.org/10.23919/comex.2024ATF0001","url":null,"abstract":"The 2024 International Workshop on Antenna Technology (iWAT2024) was held at Tohoku University in Sendai, Japan, from April 15th to 18th, 2024. The workshop aims to provide an international forum for exchanging information on the progress of research and development in antenna technology. It specifically focuses on small antennas and the application of artificial materials to antenna design. Taking this opportunity, a special section has been planned to publish papers in a cluster format, aiming to raise interest among researchers in the fields of small antennas, metamaterials, wireless applications, and related topics.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"38-38"},"PeriodicalIF":0.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10858684","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107191","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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