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Speckle Correction Filter Based on Spatial Polarimetric Coherence for Full Polarimetric Synthetic Aperture Radar Image 基于全偏振合成孔径雷达图像空间偏振相干的斑点校正滤波器
IF 0.3
IEICE Communications Express Pub Date : 2024-08-09 DOI: 10.23919/comex.2024XBL0125
Muhammad Hamka Ibrahim;Subuh Pramono;Jing-Yuan Wang;Yu-Fan Cai;Feri Adriyanto;Josaphat Tetuko Sri Sumantyo
{"title":"Speckle Correction Filter Based on Spatial Polarimetric Coherence for Full Polarimetric Synthetic Aperture Radar Image","authors":"Muhammad Hamka Ibrahim;Subuh Pramono;Jing-Yuan Wang;Yu-Fan Cai;Feri Adriyanto;Josaphat Tetuko Sri Sumantyo","doi":"10.23919/comex.2024XBL0125","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0125","url":null,"abstract":"Polarimetric synthetic aperture radar (PolSAR) image exhibits a high degree of spatial information. However, the PolSAR image is subjected to speckle noise, which degrades the information quality. A speckle correction filter is proposed in this paper based on spatial polarimetric coherence. Evidence of polarimetric coherence between spatial neighboring pixels is presented. It shows that polarimetric coherence is highly correlated with neighboring pixels. Based on these characteristics, a speckle correction filter is proposed by calculating the polarimetric coherency level on a selected neighboring pixel. A correction is applied to the pixel which has a low polarimetric coherence level. A generalized three-step adaptive filter is proposed, including neighbor selection, coherency criterion, and incoherent correction. The influence of the filter on scattering mechanisms is compared by using eigenvalue-based decomposition. Qualitatively, the result shows the proposed correction filter removes the outliers in the low entropy region. Quantitively the filter can suppress the speckle noise and its variance up to 19.08%.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 10","pages":"413-416"},"PeriodicalIF":0.3,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10633226","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142376979","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
Reflection-Phase Calculation of Circularly Polarized Folded Reflectarray Antennas with Low Profile, High Efficiency, and Arbitrary Aperture Distribution 具有小外形、高效率和任意孔径分布的圆极化折叠反射阵列天线的反射相位计算
IF 0.3
IEICE Communications Express Pub Date : 2024-08-09 DOI: 10.23919/comex.2024XBL0115
Makoto Sano;Ryuji Kuse;Takeshi Fukusako
{"title":"Reflection-Phase Calculation of Circularly Polarized Folded Reflectarray Antennas with Low Profile, High Efficiency, and Arbitrary Aperture Distribution","authors":"Makoto Sano;Ryuji Kuse;Takeshi Fukusako","doi":"10.23919/comex.2024XBL0115","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0115","url":null,"abstract":"This paper presents a new concept of designing circularly polarized folded reflectarray (CPFRA) antennas. By applying the dual-reflector shaping technique to the CPFRA antennas, the reflection-phase distributions of the two reflecting surfaces comprising the CPFRA antennas are modified to realize low profile, high aperture efficiency, and arbitrary aperture-field distribution simultaneously. Numerical simulations based on the geometrical optics show that the aperture efficiency can be improved up to around 100% by realizing uniform aperture-field distribution and reducing the spillover. Designs of CPFRA antennas with low sidelobe levels are also presented.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 10","pages":"409-412"},"PeriodicalIF":0.3,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10633229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377146","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
Path Loss Model from 922 MHz to 28 GHz in Office Environment 办公室环境中 922 MHz 至 28 GHz 的路径损耗模型
IF 0.3
IEICE Communications Express Pub Date : 2024-08-09 DOI: 10.23919/comex.2024XBL0120
Kensuke Sakamoto;Ayaka Sakaguchi;Yuki Yamakawa;Waka Mimura;Hirokazu Sawada;Azril Haniz;Fumihide Kojima;Takeshi Matsumura
{"title":"Path Loss Model from 922 MHz to 28 GHz in Office Environment","authors":"Kensuke Sakamoto;Ayaka Sakaguchi;Yuki Yamakawa;Waka Mimura;Hirokazu Sawada;Azril Haniz;Fumihide Kojima;Takeshi Matsumura","doi":"10.23919/comex.2024XBL0120","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0120","url":null,"abstract":"To build a stable wireless communication system in an indoor environment, it is necessary to perform highly accurate simulations of radio wave propagation characteristics. The ITU-R Recommendation P series, especially ITU-R P.1238, lists estimation models for propagation loss in indoor environments under various conditions. However, there are a few cases in which propagation loss has been measured at various frequencies in the same building and under the same conditions. In these cases, necessary parameters may not be described, meaning that simulation cannot be easily performed. In this paper, we measure the radio wave propagation characteristics on the same floor and across floors for the 922 MHz to 28 GHz frequency band, which is often used in office spaces. We then apply a path loss model to each frequency and calculate the coefficient of office environment (\u0000<tex>$N$</tex>\u0000) and inter-floor attenuation \u0000<tex>$(L_{f}(n))$</tex>\u0000.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 10","pages":"417-420"},"PeriodicalIF":0.3,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10633227","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377144","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
Difference-Beam Operation in a Center-Fed Dual-Polarized Parallel-Plate Waveguide Slot Array Antenna 中心馈电双极化平行板波导槽阵列天线中的差分波束工作原理
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0100
Huanqian Xiong;Jiro Hirokawa;Takashi Tomura
{"title":"Difference-Beam Operation in a Center-Fed Dual-Polarized Parallel-Plate Waveguide Slot Array Antenna","authors":"Huanqian Xiong;Jiro Hirokawa;Takashi Tomura","doi":"10.23919/comex.2024XBL0100","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0100","url":null,"abstract":"This letter deals with the difference-beam operation in a centerfeed dual-polarized parallel-plate waveguide slot array antenna at 24.5GHz, which consists of two orthogonally arranged 20×19 arrays of radiating slot pairs. A center-feeding scheme is employed in this design. Each rectangular feeding waveguide, fed by a probe, can feed half of the radiating panel, enabling easy control of the phase difference. Experimental results show that the monopulse antenna array has a bandwidth of 12.8% for reflections below −10 dB while it produces the sum beams, and 13.3% to produce the difference beams. Port isolation between the sum mode and difference mode is above 15 dB within the working frequency band. The measured realized gain of the sum beam is 31.3 dBi at 24.5 GHz, and the measured null-depth is below −33.9 dB for both polarizations.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"359-362"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591717","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142091059","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
Evaluation of Shadowing Effect on Channel Observation for Spectrum Sharing Access 评估阴影对频谱共享接入信道观测的影响
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0106
Hideya So;Hayato Soya
{"title":"Evaluation of Shadowing Effect on Channel Observation for Spectrum Sharing Access","authors":"Hideya So;Hayato Soya","doi":"10.23919/comex.2024XBL0106","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0106","url":null,"abstract":"Spectrum sharing, in which multiple wireless systems share the same radio resources, has been considered to improve frequency utilization efficiency. As a spectrum sharing without control signals, a technique that observes the usage of radio resources, called channel occupation ratio, used by other systems and selects a vacant channel has been considered. However, previous studies have simplified the model of the interfering system, which is different from the real environment. In wireless communications, fluctuations in received power occur due to shadowing caused by the location and the surrounding environment. Previous studies have not clarified the effect of received power fluctuation due to shadowing on observing the occupancy rate. This letter formulates the effects on the observation results of received power fluctuations due to the location of interfering stations and shadowing. Computer simulations with randomly placed interfering stations and shadowing environments show that the proposed formulation almost matches the observed results.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"379-383"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591720","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142090747","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 Distributed UAV Management System Inspired by Packet-Switched Networks 受分组交换网络启发的分布式无人机管理系统
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0101
Takahiko Haraguchi;Hiroshi Katada;Taku Yamazaki;Takumi Miyoshi;Ryo Yamamoto;Kiyoshi Ueda
{"title":"A Distributed UAV Management System Inspired by Packet-Switched Networks","authors":"Takahiko Haraguchi;Hiroshi Katada;Taku Yamazaki;Takumi Miyoshi;Ryo Yamamoto;Kiyoshi Ueda","doi":"10.23919/comex.2024XBL0101","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0101","url":null,"abstract":"Unmanned aerial vehicles (UAVs) are expected to be used in various applications such as delivery services and sensing from airspaces in smart cities. In the future, UAV control systems must address a densely mixed environment comprising various services and users regardless of individuals or businesses. However, users cannot flexibly join or leave the system because of their centralized design. This letter proposes a distributed UAV management system inspired by packet-switched networks, to address dense UAV environments. The proposed system controls autonomous UAVs as packets in packet-switched networks. Each UAV flies along a path composed of links between ground beacon devices as routers. We analyzed the characteristics of the proposed system in dense situations using computer simulation. Simulation results indicate that the proposed system can handle numerous UAVs based on packet-switched networks.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"389-392"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591721","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142090889","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
Multiple-Wave Source Localization Using UAVs in NLOS Environments 在 NLOS 环境中使用无人飞行器进行多波源定位
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0104
Shinichi Murata;Takahiro Matsuda;Takefumi Hiraguri
{"title":"Multiple-Wave Source Localization Using UAVs in NLOS Environments","authors":"Shinichi Murata;Takahiro Matsuda;Takefumi Hiraguri","doi":"10.23919/comex.2024XBL0104","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0104","url":null,"abstract":"Localization techniques for unknown radio wave sources are crucial from the perspective of efficient utilization of frequency resources. The authors have studied methods for localizing a single wave source using unmanned aerial vehicles (UAVs) in non-line-of-sight (NLOS) environments based on maximum likelihood estimation. In this study, we propose a localization method for multiple wave sources by extending the singlewave source localization method. In the proposed method, the direction of arrivals (DoAs) at UAVs is modeled with a mixture of von-Mises distributions, and the wave sources are estimated by superimposing the DoA distributions estimated at the UAVs. The proposed method is validated with a simple simulation experiment with two wave sources.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"375-378"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591715","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142090748","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
Genetic Algorithm Optimization of Sensor Placement for CO2 Concentration Observation 遗传算法优化二氧化碳浓度观测传感器的布置
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0103
Tomoaki Matsuda;Shusuke Narieda
{"title":"Genetic Algorithm Optimization of Sensor Placement for CO2 Concentration Observation","authors":"Tomoaki Matsuda;Shusuke Narieda","doi":"10.23919/comex.2024XBL0103","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0103","url":null,"abstract":"In our previous studies, we introduced a method for determining the optimal sensor placement of wireless sensor networks for monitoring indoor carbon dioxide (CO2) concentrations. This method, based on brute force, has proven to be accurate and reliable. However, the computational complexity increases exponentially with an increase in the number of sensors. Therefore, this study proposes a novel approach for optimal sensor node placement based on a genetic algorithm (GA) that offers a more efficient alternative to the brute force method. By utilizing the GA, we achieved optimal sensor placement with reduced computational complexity. To validate the effectiveness of our GA based method, we conducted numerical experiments using observed CO2 concentration. The results demonstrate that our proposed approach not only achieves optimal sensor placement but also maintains the accuracy of the observations.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"393-396"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591722","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142091032","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 Indoor Drone Positioning Using Wi-Fi RTT 利用 Wi-Fi RTT 进行室内无人机定位的实验研究
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0102
Yuichiro Sugiyama;Kentaro Kobayashi
{"title":"Experimental Study on Indoor Drone Positioning Using Wi-Fi RTT","authors":"Yuichiro Sugiyama;Kentaro Kobayashi","doi":"10.23919/comex.2024XBL0102","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0102","url":null,"abstract":"As an alternative to GPS, we focus on indoor positioning using Wi-Fi RTT (Round Trip Time), which measures the round trip time to a Wi-Fi access point. Wi-Fi RTT-based positioning has not been well studied for indoor drones. As an experimental study of indoor drone positioning using Wi-Fi RTT, this paper presents a positioning method using a combination of on-board altimeter and Wi-Fi RTT ranging, and experimental results of drone positioning when stationary and hovering to clarify the positioning accuracy in both 2.4 GHz and 5 GHz bands. This paper shows that in both frequency bands, the positioning accuracy is significantly degraded during hovering compared to stationary, and that there is no significant difference between 2.4GHz and 5 GHz bands.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"371-374"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591713","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142091060","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 Technology for Radio Wave Propagation Characteristics in Sub-Terahertz Band 亚太赫兹波段无线电波传播特性可视化技术
IF 0.3
IEICE Communications Express Pub Date : 2024-07-09 DOI: 10.23919/comex.2024XBL0088
Hikaru Tsuchida;Kazuaki Ishioka;Michiya Hayama;Shusaku Umeda;Akinori Taira
{"title":"Visualization Technology for Radio Wave Propagation Characteristics in Sub-Terahertz Band","authors":"Hikaru Tsuchida;Kazuaki Ishioka;Michiya Hayama;Shusaku Umeda;Akinori Taira","doi":"10.23919/comex.2024XBL0088","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0088","url":null,"abstract":"To analyze the radio wave propagation characteristics, we observed the wavefront as an image using 3-dimensional imaging technology that separates the arrival times of the radio waves. In this paper, by imaging the wavefront, we can observe the radio wave propagation characteristics at each frequency.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 9","pages":"363-366"},"PeriodicalIF":0.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10591711","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142091034","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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