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An Intelligent Antenna Classification Method Using Mamdani Fuzzy Inference System 基于Mamdani模糊推理系统的智能天线分类方法
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0195
Jitu Prakash Dhar;Eisuke Nishiyama;Ichihiko Toyoda
{"title":"An Intelligent Antenna Classification Method Using Mamdani Fuzzy Inference System","authors":"Jitu Prakash Dhar;Eisuke Nishiyama;Ichihiko Toyoda","doi":"10.23919/comex.2024XBL0195","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0195","url":null,"abstract":"Proper antenna classification is required for complex systems including specific application and performance parameters such as resonance frequency, gain, and reflection coefficient because conventional mathematical decision-making models are not well-suited for evaluating these systems. This study proposes an antenna classification method based on Mamdani Fuzzy Inference System (FIS) to determine the appropriate antenna type for those requirements. The performance parameters of five types of antennas are evaluated to construct the configuration of the FIS. The FIS responses for unseen requirements verify the model's performance showing its classification capability for new data.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"111-114"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856830","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800828","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 a Pseudonym Change Scheme using LSH for Location Privacy in V2X Communication 针对 V2X 通信中的位置隐私，评估使用 LSH 的假名变更方案
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0184
Yuki Higashida;Kenya Sato
{"title":"Evaluation of a Pseudonym Change Scheme using LSH for Location Privacy in V2X Communication","authors":"Yuki Higashida;Kenya Sato","doi":"10.23919/comex.2024XBL0184","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0184","url":null,"abstract":"In Vehicle-to-Everything (V2X) communication, vehicles transmit their information to surrounding vehicles and infrastructures for traffic safety and efficiency. However, vehicle anonymity in communications is important because location privacy is threatened when communications are eavesdropped and traced by malicious attackers. The method of periodically changing pseudonyms instead of using actual identification has been considered to provide anonymity. However, anonymity is significantly reduced when the number of vehicles changing pseudonyms simultaneously is insufficient, or when the vehicle trajectory is easily predictable. In this paper, we propose a cooperative pseudonym change scheme among vehicles with similar vehicle information extracted using Locality Sensitive Hash-ing (LSH), aiming to achieve higher vehicle anonymity. We analyze the anonymity of the proposed scheme in our mathematical model under lim-ited circumstances and evaluate it in comparison with existing pseudonym change schemes.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"115-118"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856831","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800959","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 High-Performance Reversible Data Hiding Scheme for Audio Streams Base on Code Division Multiplexing 一种基于码分复用的音频流高性能可逆数据隐藏方案
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0191
Ruihe Ma;Jian Xu
{"title":"A High-Performance Reversible Data Hiding Scheme for Audio Streams Base on Code Division Multiplexing","authors":"Ruihe Ma;Jian Xu","doi":"10.23919/comex.2024XBL0191","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0191","url":null,"abstract":"The importance of privacy data protection has become increasingly prominent in the communication system. This paper presented a code division multiplexing(CDM)-based high-performance reversible data hid-ing(RDH) scheme for audio streams. In the scheme, plenty of private data are embedded into the audio stream through orthogonal spreading vectors without interfering with each other. Consequently, both private data and the original audio stream can be completely retrieved at the receiver side. At the same time, according to the orthogonality of spreading vectors, private data can be repeatedly embedded within an audio stream, thereby enhancing the capacity of data embedding to a great extent. As the mutual cancellation of most elements accrues during multiple-level data embedding, high percep-tual quality for audio streams is obtained even with a large data-embedding payload. Extensive experimental results clearly show that the CDM-based audio RDH algorithm surpasses other state-of-the-art approaches in terms of data-embedding performance.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"107-110"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856836","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800759","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
Experiment of Wireless Transmission of Cloud Data in Cloud Avoidance Network for Optical Communications Between Space and Ground 空间与地面光通信避云网络中云数据无线传输实验
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0162
Tatsuya Mukai;Yoshihisa Takayama;Yukiya Hanada;Takumi Iwamoto;Takuro Tsuchikawa;Takao Endo
{"title":"Experiment of Wireless Transmission of Cloud Data in Cloud Avoidance Network for Optical Communications Between Space and Ground","authors":"Tatsuya Mukai;Yoshihisa Takayama;Yukiya Hanada;Takumi Iwamoto;Takuro Tsuchikawa;Takao Endo","doi":"10.23919/comex.2024XBL0162","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0162","url":null,"abstract":"Optical communication links between space and ground will be disconnected by cloud blockages only based on optical site diversity, because of cloud blockages randomly changing in time and space. To continue the operation, cloud avoidance network with cloud observation from space and ground and network controls are necessary, however, optical ground stations will be often placed at remote sites without ground wired network. To realize continuous operation under such an environment, our cloud avoidance network is designed to extract and handle only minimum and meaningful information of clouds. The network experiment has been conducted on ground wired network and the operation possibility has been also verified on ground wireless network. In this paper, first, overview of our cloud avoidance network and structures of each equipment on the network, Next, operation possibility of our cloud avoidance network, even based on a low rate communication environment because of the unique system feature of handling only information required for the cloud avoidance network and then, the operation possibility based on the mobile wireless router verified through our experiment are presented.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"87-90"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856834","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800829","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
Study of a Simple Measurement Technique for Radiated Emissions from Automotive wire Harnesses by Transfer Function Using a Single Antenna 基于单天线传递函数的汽车线束辐射发射简单测量技术研究
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0194
Tsubasa Suto;Teru Obata;Hiroyasu Sano;Takeshi Ueno;Takuji Arima
{"title":"Study of a Simple Measurement Technique for Radiated Emissions from Automotive wire Harnesses by Transfer Function Using a Single Antenna","authors":"Tsubasa Suto;Teru Obata;Hiroyasu Sano;Takeshi Ueno;Takuji Arima","doi":"10.23919/comex.2024XBL0194","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0194","url":null,"abstract":"This study develops an efficient measurement method for radiated emissions from automotive wire harnesses. The proposed measurement method utilizes the transfer function (T F) between a reference model and a simplified setup model. The results measured by the proposed method show high correlation with the reference measurements. In addition, the proposed method requires only one simple evaluation antenna for measure-ment, whereas the previously proposed TF method requires two antennas. We also attempted to eliminate dips in the measurement by using multiple measurement points for the simple evaluation antenna. In addition, the conventional TF method requires a 4-port VNA, but the proposed method can perform the measurement with a 2-port VNA. Therefore, the proposed method can reduce the cost of the measurement device.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"103-106"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856833","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800830","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
Channel Reservation Scheme for Network-Controlled IEEE 802.11 Wireless LANs 网络控制IEEE 802.11无线局域网的信道预留方案
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0175
Junichi Iwatani;Hirantha Abeysekera;Yusuke Asai;Yasushi Takatori
{"title":"Channel Reservation Scheme for Network-Controlled IEEE 802.11 Wireless LANs","authors":"Junichi Iwatani;Hirantha Abeysekera;Yusuke Asai;Yasushi Takatori","doi":"10.23919/comex.2024XBL0175","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0175","url":null,"abstract":"This paper proposes a priority control method utilizing channel reservation for high-priority access points (APs) in IEEE 802.11 wire-less LAN s. The proposed algorithms are based on a network-controlled channel allocation scheme called RATOP. Computer simulation results demonstrated the positive effect of the proposed scheme on average and minimum throughput in a large area. This paper also proposes an enhanced algorithm that releases reserved channels to improve throughput. An estimation method based on theoretical analysis provides the number of required reserved channels for a given throughput ratio of high-priority APs to low-priority APs.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"95-98"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856832","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800827","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 of Lens Antenna with 4x4 Element 4-Port Antenna in the 300-GHz Band 300 ghz频段4 × 4单元4端口天线透镜天线的波束转向
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0167
Seiji Nishi;Kazuhiko Tamesue;Kunihisa Jitsuno;Toshio Sato;Takuro Sato;Tetsuya Kawanishi
{"title":"Beam Steering of Lens Antenna with 4x4 Element 4-Port Antenna in the 300-GHz Band","authors":"Seiji Nishi;Kazuhiko Tamesue;Kunihisa Jitsuno;Toshio Sato;Takuro Sato;Tetsuya Kawanishi","doi":"10.23919/comex.2024XBL0167","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0167","url":null,"abstract":"A circular polarized 4x4 element 4-port antenna in the 300 GHz band was designed and fabricated. Antenna gain of more than 10 dBic and axial ratio of less than 3 dB were obtained at 285.12 GHz to 289.44 GHz, which are ch 16 and ch 17 of IEEE 802.15.3d. If the power of the four ports were ideally combined, the antenna gain would increase by 6 dB to 16 dBic. A lens was designed for the circularly polarized 4x4 element 4-port antenna. The focal length of the lens was 100 mm and lens radius is 35 mm. An antenna gain of 40 dBic was calculated using the lens. Placing the 4x4 element 4-port antenna at the focal length of the lens would provide maximum gain, but no beam steering by phase controle. Placing the antenna closer than the focal length would lower the antenna gain but allow beam steering by phase controle. The antenna gain and beam tilt angle were calculated for different distances between the lens and the 4x4 element 4-port antenna. A lens antenna with a lens height of 70 mm was assembled and beam steering was measured.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"91-94"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800958","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
Distance Estimation Under Molecular Absorption Delay in THz Frequency Band 太赫兹波段分子吸收延迟下的距离估计
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0174
Zhaona Wu;Kenta Umebayashi;Janne Lehtomaki
{"title":"Distance Estimation Under Molecular Absorption Delay in THz Frequency Band","authors":"Zhaona Wu;Kenta Umebayashi;Janne Lehtomaki","doi":"10.23919/comex.2024XBL0174","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0174","url":null,"abstract":"In this letter, we propose a distance estimation method that accounts for molecular absorption (MA) delay in the THz frequency band. In radio propagation, the time of arrival (TOA) at the receiver from the transmitter is typically determined by the propagation delay, which is the distance divided by the speed of light in a line-of-sight (LoS) scenario. However, in THz the observable TOA could exceed the propagation delay due to an additional delay denoted by MA delay caused by molecular absorption. This MA delay introduces a biased estimate into conventional distance estimations. In this letter, a novel distance estimation method based on TOA incorporating MA delay is proposed. Numerical evaluations indicate that our proposed distance estimation method outperforms the conventional approach by accounting for the effects of MA delay.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"99-102"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856835","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800760","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
Indoor mMTC Group Targets Localization in 5G Networks Based on Parallel Chaotic Stochastic Resonance Processing of Distance Estimation Between Terminals 基于终端距离估计并行混沌随机共振处理的5G网络室内mMTC群目标定位
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0142
Zhijun Qin;Tengfei Xie;Chen Xie;Di He
{"title":"Indoor mMTC Group Targets Localization in 5G Networks Based on Parallel Chaotic Stochastic Resonance Processing of Distance Estimation Between Terminals","authors":"Zhijun Qin;Tengfei Xie;Chen Xie;Di He","doi":"10.23919/comex.2024XBL0142","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0142","url":null,"abstract":"In this research, a high-precision positioning method for 5G group communication terminals based on the mMTC scenario is proposed. Group positioning extends the original positioning for a single terminal to positioning for multiple terminals simultaneously, utilizing the interaction information between terminals to optimize the positioning results by using the parallel chaotic stochastic resonance processing technique. On the basis of traditional single target positioning algorithms, the mMTC communication mode is effectively used to increase the positioning information between terminals and improve the average positioning accuracy of each communication terminal in the 5G cluster.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"59-62"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799929","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107197","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
Explosives Detection using Shadow Features in Radar Images for Walk-Through Security Screening 利用雷达图像中的阴影特征进行爆炸物检测
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0172
Shingo Yamanouchi;Masayuki Ariyoshi;Toshiyuki Nomura
{"title":"Explosives Detection using Shadow Features in Radar Images for Walk-Through Security Screening","authors":"Shingo Yamanouchi;Masayuki Ariyoshi;Toshiyuki Nomura","doi":"10.23919/comex.2024XBL0172","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0172","url":null,"abstract":"Radar imaging technologies have been utilized to detect concealed hazardous materials for security screening in public facilities. We have developed a high-throughput walk-through and whole-body security screening system called Invisible Sensing (IVS) based on radar imaging and deep learning. In our previous work, we have demonstrated that the IVS system can detect guns and knives while subject persons walk through the system. This paper presents a newly developed function to detect explosives in radar images on the IVS system. Since most explosives have low reflectivity to microwaves, it is difficult to detect the shape of explosives in radar images. In contrast, the human body is highly reflective and visible in radar images. We propose a novel approach to detect low-reflective explosives in radar images by learning shadow features against the high-reflective human body background. We demonstrate that the proposed detection technique integrated into the IVS system achieved successful explosive detection performance in real time.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"71-74"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799932","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107200","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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