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Effectiveness evaluation of MIMO in polarized OAM multiplexing 极化 OAM 复用中的 MIMO 效果评估
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0156
Mikito Ito;Shuhei Saito;Hirofumi Suganuma;Kayo Ogawa;Fumiaki Maehara
{"title":"Effectiveness evaluation of MIMO in polarized OAM multiplexing","authors":"Mikito Ito;Shuhei Saito;Hirofumi Suganuma;Kayo Ogawa;Fumiaki Maehara","doi":"10.23919/comex.2023XBL0156","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0156","url":null,"abstract":"Adopting polarization for orbital angular momentum (OAM) multiplexing can suppress beam divergence because of using the lower OAM modes, which leads to extending the link distance. In this study, we investigate the effectiveness of multiple-input multiple-output (MIMO) on the polarized OAM multiplexing under the restriction of the same total transmit power and total number of antenna elements. To evaluate the combined effects of polarization and MIMO on system capacity, we conducted computer simulations. Moreover, we investigate the system capacity when only lower OAM modes are available, and compare it with the case without mode limitations. The results of our study provide valuable insights into the potential benefits of using polarization and MIMO for OAM multiplexing.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"60-63"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400562","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042865","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
Resource allocation for hybrid FSO/RF satellite-assisted multiple backhauled UAVs over Starlink networks 星链网络上混合 FSO/RF 卫星辅助多回程无人机的资源分配
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0154
Khanh D. Dang;Hoang D. Le;Chuyen T. Nguyen;Anh T. Pham
{"title":"Resource allocation for hybrid FSO/RF satellite-assisted multiple backhauled UAVs over Starlink networks","authors":"Khanh D. Dang;Hoang D. Le;Chuyen T. Nguyen;Anh T. Pham","doi":"10.23919/comex.2023XBL0154","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0154","url":null,"abstract":"This letter addresses the resource allocation issue for hybrid free-space optics (FSO)/radio frequency (RF)-based satellite-assisted multiple users. Specifically, we present the rate adaptation-aided data frame allocation design for hybrid FSO/RF satellite-assisted multiple unmanned aerial vehicles (UAVs). The considered allocation scheme ensures latency fairness among UAVs serving as flying base stations (BSs). Numerical results confirm the effectiveness of the proposed solution over the state-of-the-art. Moreover, we investigate the feasibility of a case study over the Japan networks using practical SpaceX's Starlink satellite constellation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"52-55"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400561","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042935","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-integer power of two QAM signaling for flexible and nonlinearity tolerant optical fiber transmission systems 用于灵活和非线性容差光纤传输系统的非整数功率双 QAM 信令
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0166
Wataru Imajuku;Shunsuke Takahashi;Yuto Nakamura;Ryo Akahoshi
{"title":"Non-integer power of two QAM signaling for flexible and nonlinearity tolerant optical fiber transmission systems","authors":"Wataru Imajuku;Shunsuke Takahashi;Yuto Nakamura;Ryo Akahoshi","doi":"10.23919/comex.2023XBL0166","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0166","url":null,"abstract":"This paper studies non-integer power of two-ary quadrature amplitude modulation (QAM) for long-haul optical fiber transmission systems. Numerical simulations show that 12-QAM and 24-QAM provide intermediate solutions on reachable transmission distances among traditional M-QAM such as C8-QAM, 16-QAM, and 32-QAM. In addition, short block length probabilistic shaping of 24-QAM not only provides an intermediate solution with nonlinear tolerance, but also yields greater transmission distances than 16-QAM for the same information data rates.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"68-71"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400567","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042870","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
Optimal beam-focusing design for 6G near-field SWIPT systems 6G 近场 SWIPT 系统的最佳光束聚焦设计
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0152
Nan Song;Haibo Dai
{"title":"Optimal beam-focusing design for 6G near-field SWIPT systems","authors":"Nan Song;Haibo Dai","doi":"10.23919/comex.2023XBL0152","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0152","url":null,"abstract":"This letter investigates a novel 6G near-field simultaneous wireless information and power transfer (SWIPT) system, in which a single hybrid transmitter, equipped with an extremely large-scale antenna array, concurrently provides wireless data and energy access to mobile terminals. In this pioneering scenario, we delve into the optimal beam-focusing design with the goal of maximizing the weighted-sum energy harvested by all energy receivers while ensuring the achievable rate requirements of information receivers. Despite the inherent non-convexity of the associated optimization problem, we achieve a globally optimal solution by employing the technique of semi-definite relaxation. Our numerical results affirm the remarkable effectiveness of the proposed optimal beam-focusing design.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"84-87"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400559","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042818","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 study of secure communication with secret sharing method in MIMO eigen stream parallel channels 多输入多输出（MIMO）特征流并行信道中秘密共享方法的安全通信研究
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0144
Masaaki Yamanaka;Shigenori Kinjo;Shinichi Miyamoto
{"title":"A study of secure communication with secret sharing method in MIMO eigen stream parallel channels","authors":"Masaaki Yamanaka;Shigenori Kinjo;Shinichi Miyamoto","doi":"10.23919/comex.2023XBL0144","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0144","url":null,"abstract":"This letter proposes a secure transmission method using spatially parallel channels formed in a multi-input multi-output (MIMO) communication scenario. In the proposed method, the transmitted information is divided into pieces using a secret-sharing method. These generated pieces are then transmitted separately to the destination through the parallel sub-channels of the MIMO communication link. The secret-sharing method ensures that the transmitted information remains unrevealed unless all the divided pieces are obtained, thus achieving secure communication by establishing an advantageous situation for the legitimate receiver to gather the divided pieces against wiretappers in the surrounding area. Computer simulations demonstrate that allocating transmission power inverse-proportionally to the channel gains among the MIMO sub-channels creates a secure link to the receiver from the channel capacity perspective. The secret capacity of the link increases with the number of antenna elements in the MIMO configuration at the expense of power gain.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"72-75"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400558","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042866","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
Practical estimation and visualization of V2V propagation at 700 MHz band using FDTD method 使用 FDTD 方法对 700 MHz 波段的 V2V 传播进行实用估算和可视化
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0153
Tomokazu Okugi;Kan Okubo
{"title":"Practical estimation and visualization of V2V propagation at 700 MHz band using FDTD method","authors":"Tomokazu Okugi;Kan Okubo","doi":"10.23919/comex.2023XBL0153","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0153","url":null,"abstract":"Herein, we present an effective analysis using the finite-difference time-domain (FDTD) method for vehicle-to-vehicle (V2V) radio propagation in the 700 MHz band at urban intersections. By combining the FDTD (2,4) method with multi-core processors, a high-precision computation and visualization analysis of the propagation phenomena is realized using practical computation resources for V2V communication systems in a large and complex propagation environment. We demonstrate that the causal relationship between the radio propagation process and reception characteristics can be analyzed both quantitatively and qualitatively.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"56-59"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400560","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042867","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
Integration of speed control and bandwidth allocation to enable fair uplink communications in UAV-aided aerial base stations based on Open-RAN 整合速度控制和带宽分配，在基于 Open-RAN 的无人机辅助空中基站中实现公平的上行链路通信
IF 0.3
IEICE Communications Express Pub Date : 2024-01-15 DOI: 10.23919/comex.2023XBL0178
Shu Mitsui;Hiroki Nishiyama
{"title":"Integration of speed control and bandwidth allocation to enable fair uplink communications in UAV-aided aerial base stations based on Open-RAN","authors":"Shu Mitsui;Hiroki Nishiyama","doi":"10.23919/comex.2023XBL0178","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0178","url":null,"abstract":"Unmanned aerial vehicle (UAV) base stations have a variety of applications due to their ability to be quickly and freely deployed. They provide a promising solution when existing terrestrial networks are damaged during a disaster and network connectivity is lost, helping to restore connectivity in disaster-affected areas. However, moving UAVs provide unfair network connectivity for ground-based user equipment. To solve this, we need to integrate speed control and bandwidth allocation. In this paper, we give an overview of the algorithms integrating them and demonstrate how they further improve fairness. Moreover, we provide an architecture based on the Open-RAN architecture for running integrated algorithms. Finally, we use computer simulations to demonstrate its effectiveness.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 3","pages":"93-96"},"PeriodicalIF":0.3,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10400568","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042892","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
Measuring Antenna Radiation Efficiency in a Reverberation Chamber and Effect of Unstirred Waves 在混响室中测量天线辐射效率和未搅动波的影响
IF 0.3
IEICE Communications Express Pub Date : 2023-12-12 DOI: 10.23919/comex.2023XBL0149
Katsushige Harima;Kaoru Gotoh
{"title":"Measuring Antenna Radiation Efficiency in a Reverberation Chamber and Effect of Unstirred Waves","authors":"Katsushige Harima;Kaoru Gotoh","doi":"10.23919/comex.2023XBL0149","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0149","url":null,"abstract":"The antenna radiation efficiency of a K-band horn was determined using a reference waveguide method with S-parameters in a reverberation chamber. Numerical analysis was performed to validate the applicability of the measurement method and the measured results. In addition, the effect of unstirred waves on the radiation efficiency measurements was evaluated using the complex \u0000<tex>$S-text{parameter}$</tex>\u0000 method for identifying unstirred waves.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 2","pages":"48-51"},"PeriodicalIF":0.3,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10355762","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139700491","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
Microwave Power Transmission Using a Signal-to-Leakage-and-Noise Ratio to Protect Wireless Communication Devices 利用信号泄漏与噪声比的微波功率传输保护无线通信设备
IF 0.3
IEICE Communications Express Pub Date : 2023-12-12 DOI: 10.23919/comex.2023XBL0138
Shun Shibuya;Koichi Adachi;Hiroyuki Morikawa;Yoshiaki Narusue
{"title":"Microwave Power Transmission Using a Signal-to-Leakage-and-Noise Ratio to Protect Wireless Communication Devices","authors":"Shun Shibuya;Koichi Adachi;Hiroyuki Morikawa;Yoshiaki Narusue","doi":"10.23919/comex.2023XBL0138","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0138","url":null,"abstract":"Microwave Power Transmission (MPT) is a promising technology that can be utilized to charge devices wirelessly and remotely. However, most previous studies on MPT focused on improving charging efficiency and have ignored the harmful effects on wireless communication devices that are sensitive to the considerable received signal power caused by the electromagnetic radiation of microwaves. To resolve this problem, this study introduces into MPT the signal-to-leakage-and-noise ratio (SLNR), used to suppress co-channel interference in multi-user Multiple-Input Multiple-Output (MIMO) downlink communications. We establish a beamforming scheme that maximizes SLNR for MPT. Compared with a beamforming scheme that does not consider leakage power, the proposed method transmits power to intended receivers while suppressing leakage power to protected devices. Based on simulations, our method decreases the leak power to protected devices by over 10 dB while maintaining the received power at the targeted receivers, compared with the conventional method.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 2","pages":"39-42"},"PeriodicalIF":0.3,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10355758","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139700484","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
Fast Algorithm for Automotive Radar Target Detection in Mutual Interference 相互干扰中汽车雷达目标检测的快速算法
IF 0.3
IEICE Communications Express Pub Date : 2023-12-12 DOI: 10.23919/comex.2023XBL0118
Ai Mingshun;Yang Weijie;Xu Li;Yan Guang;Yue Lingling;Yang Zijiang
{"title":"Fast Algorithm for Automotive Radar Target Detection in Mutual Interference","authors":"Ai Mingshun;Yang Weijie;Xu Li;Yan Guang;Yue Lingling;Yang Zijiang","doi":"10.23919/comex.2023XBL0118","DOIUrl":"https://doi.org/10.23919/comex.2023XBL0118","url":null,"abstract":"As one of the important sensors for driving assistance, millimeter wave radar is of great significance for automotive safety driving. However, the problem of mutual interference between automotive radar signals is becoming a non negligible threat. Mutual interference can cause a significant performance decrease of radar target detection, and this artide proposes a simple and efficient target detection method to address this issue. The proposed method utilizes the distribution difference between target echoes and interference signals in the time-frequency domain to obtain a accumulation vector of spectral peaks, which follow a Poisson distribution. Based on that, the Poisson constant false alarm detection method is proposed to detect target echos effectively at low signal-to-interference ratios. The experimental results show that the detection accuracy of the method is above 95% when the signal-to-interference ratio is below -20dB. In addition, this algorithm does not require interference compression before detecting the target, and its computational complexity is only slightly greater than that of the short time Fourier transform, so it is a fast anti interference detection method.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 2","pages":"26-29"},"PeriodicalIF":0.3,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10355753","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139700485","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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