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Preamble Design for Frame Synchronization in VLF Communication Based on Prolate Spheroidal Wave Function Sequences 基于长球面波函数序列的VLF通信帧同步的序文设计
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-19 DOI: 10.1109/LCOMM.2025.3581198
Kefeng Deng;Rui Xue
{"title":"Preamble Design for Frame Synchronization in VLF Communication Based on Prolate Spheroidal Wave Function Sequences","authors":"Kefeng Deng;Rui Xue","doi":"10.1109/LCOMM.2025.3581198","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3581198","url":null,"abstract":"We propose a novel preamble sequence generation approach for continuous phase modulation based on prolate spheroidal wave functions (CPM-PSWF) for very low-frequency (VLF) system that can be generated on the carrier without post-modulation. The original principle, inspired from the PSWF frequency shaping pulses, is presented. From the autocorrelation of the proposed preamble and correlation performance with the other received signals in VLF system, the excellent detection characteristic of the proposed preamble is verified, under both Gaussian and non-Gaussian noise. The correct detection probability of the proposed preamble is more than 84% under Gaussian noise when Eb/<inline-formula> <tex-math>$N_{{0}} ge 0$ </tex-math></inline-formula>dB.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1948-1952"},"PeriodicalIF":4.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
OAM-Based Optical Wireless Security: Leveraging Beam Misalignment and Crosstalk for Eavesdropping Resistance 基于oam的光无线安全：利用波束失调和串扰来抵抗窃听
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-19 DOI: 10.1109/LCOMM.2025.3581505
Mohammad Taghi Dabiri;Mazen Hasna;Saud Althunibat;Khalid A. Qaraqe
{"title":"OAM-Based Optical Wireless Security: Leveraging Beam Misalignment and Crosstalk for Eavesdropping Resistance","authors":"Mohammad Taghi Dabiri;Mazen Hasna;Saud Althunibat;Khalid A. Qaraqe","doi":"10.1109/LCOMM.2025.3581505","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3581505","url":null,"abstract":"This letter investigates the security of orbital angular momentum (OAM)-based free-space optical (FSO) communication systems under eavesdropping attacks. We analyze the impact of beam misalignment and inter-modal crosstalk on an eavesdropper’s ability to intercept OAM-modulated signals. Unlike conventional FSO links, where misalignment errors degrade system performance, we show that moderate beam misalignment can enhance security by inducing severe crosstalk at the eavesdropper’s receiver. Through numerical simulations, we evaluate the bit error rate (BER) of the eavesdropper as a function of its spatial offset, transmitter tracking errors, and beam waist. The results demonstrate that even with high-quality detection, the eavesdropper’s performance significantly deteriorates beyond a critical misalignment threshold, making interception infeasible. Our findings highlight the intrinsic physical-layer security advantage of OAM-based FSO links, providing insights for designing robust and secure optical communication systems.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 9","pages":"2003-2007"},"PeriodicalIF":4.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Time-Frequency-Space Joint Extrapolation for 6G Near-Field Non-Stationary Massive MIMO Channels 6G近场非平稳海量MIMO信道时频空联合外推
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-19 DOI: 10.1109/LCOMM.2025.3581239
Lihua Pang;Wenxing Han;Yang Zhang;Haobing Jin;Yijian Chen;Anyi Wang;Jiandong Li
{"title":"Time-Frequency-Space Joint Extrapolation for 6G Near-Field Non-Stationary Massive MIMO Channels","authors":"Lihua Pang;Wenxing Han;Yang Zhang;Haobing Jin;Yijian Chen;Anyi Wang;Jiandong Li","doi":"10.1109/LCOMM.2025.3581239","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3581239","url":null,"abstract":"Massive multi-input multi-output (MIMO) systems confront the challenges of significant pilot overhead required for multi-domain channel state information (CSI) acquisition, especially in near-field non-stationary 6G environments with high-speed user mobility. To address this issue, we design a novel network architecture for multi-user time-frequency-space joint channel extrapolation that integrates a temporal graph convolutional network (TGCN) and a dual-discriminator generative adversarial network (2DGAN). By leveraging geographic topology to capture time-frequency-space correlations within the channels and multi-user interactions, the designed network reconstructs full spatial CSI from partial spatial CSI and extrapolates future subcarrier allocation states on the basis of historical allocations. Consequently, this approach promotes efficient information sharing to reduce CSI acquisition overhead. Simulation results show that our proposal performs nearly ideally, surpasses existing methods, and significantly improves the accuracy and robustness of channel extrapolation.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1953-1957"},"PeriodicalIF":4.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SigPurifier: A Dual-Domain Diffusion Framework for Adversarial Signal Purification in Wireless Communication SigPurifier：无线通信中对抗性信号净化的双域扩散框架
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-18 DOI: 10.1109/LCOMM.2025.3580664
Zhenyu Wen;Chendong Jin;Jinhao Wan;Yuting Jiang;Jian Liu;Yangyang Wang;Rawaa Putros Qasha;Xing Yang
{"title":"SigPurifier: A Dual-Domain Diffusion Framework for Adversarial Signal Purification in Wireless Communication","authors":"Zhenyu Wen;Chendong Jin;Jinhao Wan;Yuting Jiang;Jian Liu;Yangyang Wang;Rawaa Putros Qasha;Xing Yang","doi":"10.1109/LCOMM.2025.3580664","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3580664","url":null,"abstract":"With the rapid development of deep learning, its powerful feature extraction capabilities have shown great advantages in wireless signal modulation classification. However, limited by the inherent fragility of the model, deep learning-based modulation classification models are vulnerable to adversarial attacks. Consequently, defense frameworks integrating filtering mechanisms and adversarial learning have been developed. Yet, such approaches persistently confront the dual dilemmas of excessive feature degradation in signal processing or unwarranted dependence on prior knowledge assumptions, ultimately hindering real-world deployment. In this letter, we propose SigPurifier, a diffusion-based framework that eliminates adversarial perturbations in local data structures through forward diffusion while enhancing structural recovery through learned generative priors during signal denoising transitions. The evaluation results show that the proposed algorithm effectively eliminates adversarial attacks while maintaining signal communication quality. Compared to adversarial training methods, our model can increase the accuracy of the modulation classifier from 27.46% to 31.08%.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 9","pages":"1998-2002"},"PeriodicalIF":4.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pilot-Based Codebook Artificial Noise for Enhanced Physical Layer Security in MA-Enabled MIMO Systems 基于导频的MIMO系统物理层安全性增强的码本人工噪声
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-18 DOI: 10.1109/LCOMM.2025.3580959
Yebo Gu;Tao Zhao;Hongrou Su;Tao Shen;Jian Song
{"title":"Pilot-Based Codebook Artificial Noise for Enhanced Physical Layer Security in MA-Enabled MIMO Systems","authors":"Yebo Gu;Tao Zhao;Hongrou Su;Tao Shen;Jian Song","doi":"10.1109/LCOMM.2025.3580959","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3580959","url":null,"abstract":"This letter introduces pilot-based codebook artificial noise (PCAN) into movable antenna (MA)-enabled MIMO communication systems. It investigates the problem of optimizing secrecy capacity (SC) through the joint optimization of transmit covariance matrices and antenna positions. The sequential convex programming (SCP) method is employed to linearize the non-convex parts of the optimization problem, and an alternating optimization (AO) algorithm is utilized to iteratively solve for both the transmit covariance matrices and antenna positions. Simulation results demonstrate a significant improvement in SC. The proposed approach provides a robust solution for enhancing physical layer security in wireless communication systems, offering practical insights for future secure communications.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1938-1942"},"PeriodicalIF":4.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Joint Optimization of Active and Passive Beamforming for RIS-Assisted Secure Communication Under Multiple Eavesdroppers 多窃听器下ris辅助安全通信的主动和被动波束形成联合优化
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-18 DOI: 10.1109/LCOMM.2025.3581052
Tingyu Xie;Guoshun Nan;Qimei Cui;Gang Deng;Haitao Du;Xiaofeng Tao
{"title":"Joint Optimization of Active and Passive Beamforming for RIS-Assisted Secure Communication Under Multiple Eavesdroppers","authors":"Tingyu Xie;Guoshun Nan;Qimei Cui;Gang Deng;Haitao Du;Xiaofeng Tao","doi":"10.1109/LCOMM.2025.3581052","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3581052","url":null,"abstract":"Reconfigurable Intelligent Surface (RIS) facilitates physical-layer secure communications (PSC) by smartly controlling signal features such as phase and amplitude. Previous work shows that an illegal eavesdropper can sharply reduce the capacity for RIS-assisted PSC, while multiple eavesdroppers in the communication system, a more practical and challenging setting in the real world, is still largely underexplored. To this end, we present MuEaRIS, a novel approach that aims to maximize legitimate secure communication rates while minimizing the rate of each illegal eavesdropper for RIS-assisted PSC. Specifically, we jointly optimize Alice’s active beamforming and RIS’s passive beamforming using a novel method that explores alternating optimization and quadratic transformation. Numerical analysis shows that the proposed MuEaRIS is effective for RIS-assisted PSC in multi eavesdropper scenarios, while also outperforming existing methods in single eavesdropper settings, demonstrating broader applicability.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1943-1947"},"PeriodicalIF":4.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Deep Learning-Based Sparse Recovery and Dictionary Matching for Multipath Time Delay Estimation 基于深度学习的稀疏恢复和字典匹配多路径时延估计
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-17 DOI: 10.1109/LCOMM.2025.3580559
Yipeng Li;Keke Hu;Manyu Xue;Yuan Shen
{"title":"Deep Learning-Based Sparse Recovery and Dictionary Matching for Multipath Time Delay Estimation","authors":"Yipeng Li;Keke Hu;Manyu Xue;Yuan Shen","doi":"10.1109/LCOMM.2025.3580559","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3580559","url":null,"abstract":"Wireless channel responses contain rich multipath information, but accurately extracting this information remains challenging in complex indoor environments. In this letter, we propose a deep learning-based sparse recovery method for super-resolution multipath time delay estimation and dictionary mismatch mitigation in sparse modeling. The proposed DenoisingCNN framework recovers the sparse delay spectrum from the channel response with highly overlapping multipath components with three specialized modules to address dictionary mismatch. Numerical results demonstrate that the proposed method outperforms state-of-the-art approaches in the estimation of both the number and delays of the multipath components, offering robustness and strong generalization capabilities.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1933-1937"},"PeriodicalIF":4.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physical Layer Security Enhancement for Beyond Diagonal RIS-Aided MIMO Communications 超对角线ris辅助MIMO通信的物理层安全增强
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-16 DOI: 10.1109/LCOMM.2025.3579860
Xiaoqi Zhang;Xu Ma;Haijun Zhang;Yuzheng Ren;Difei Cao;Victor C. M. Leung
{"title":"Physical Layer Security Enhancement for Beyond Diagonal RIS-Aided MIMO Communications","authors":"Xiaoqi Zhang;Xu Ma;Haijun Zhang;Yuzheng Ren;Difei Cao;Victor C. M. Leung","doi":"10.1109/LCOMM.2025.3579860","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3579860","url":null,"abstract":"Beyond diagonal reconfigurable intelligent surface (BD-RIS) has demonstrated remarkable performance over conventional RIS through its unique flexible signal manipulation capability. This letter investigates physical layer security enhancement in a multiple-input multiple-output (MIMO) system aided by BD-RIS under eavesdropping channel. To achieve the maximal secrecy rate, we co-optimize the transmit covariance matrix and the BD-RIS unitary matrix. First, the projected gradient method refines the transmit beamforming to adhere to power constraints. Second, we propose an adaptive Riemannian conjugate gradient algorithm that incorporates low-order Taylor series expansions for geodesic approximation and hybrid conjugate parameters for co-optimization, ensuring the unitary constraint of the BD-RIS matrix. Numerical results indicate that the proposed algorithm significantly outperforms conventional RIS scheme and the benchmark schemes.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1919-1923"},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectrum Efficiency and Link Reliability Enhancement Algorithm in IRS-Assisted OTFS Systems for Vehicular Networks 车载网络红外辅助OTFS系统的频谱效率和链路可靠性增强算法
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-16 DOI: 10.1109/LCOMM.2025.3579935
Rong Zeng;Zengxian Lin;Zaichen Zhang;Na Ying;Afeng Yang
{"title":"Spectrum Efficiency and Link Reliability Enhancement Algorithm in IRS-Assisted OTFS Systems for Vehicular Networks","authors":"Rong Zeng;Zengxian Lin;Zaichen Zhang;Na Ying;Afeng Yang","doi":"10.1109/LCOMM.2025.3579935","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3579935","url":null,"abstract":"Orthogonal Time Frequency Space (OTFS) modulation offers a promising solution for Vehicle To Everything (V2X) scenarios. In this letter, we present an algorithm that reduces pilot overhead and improves link reliability, which enhances spectral efficiency in IRS (Intelligent Reflecting Surface)-assisted OTFS systems. The method projects received signals onto orthogonal subspaces and performs channel matching within each subspace to minimize pilot overhead. And we utilize the Grey Wolf Optimization (GWO) Algorithm to calculate the channel matching parameters. Additionally, an adaptive pilot overhead reduction(APOR) scheme is presented to further enhance spectral efficiency. Simulation results verify that the proposed methods significantly improve system reliability and throughput rate.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1924-1927"},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Semantics-Aware Updates From Remote Energy Harvesting Devices to Interconnected LEO Satellites 从远程能量收集设备到互联低轨道卫星的语义感知更新
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-06-16 DOI: 10.1109/LCOMM.2025.3580155
Erfan Delfani;Nikolaos Pappas
{"title":"Semantics-Aware Updates From Remote Energy Harvesting Devices to Interconnected LEO Satellites","authors":"Erfan Delfani;Nikolaos Pappas","doi":"10.1109/LCOMM.2025.3580155","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3580155","url":null,"abstract":"Providing timely and informative data in integrated terrestrial and non-terrestrial networks is critical as data volume grows while the resources available on devices remain limited. To address this, we adopt a semantics-aware approach to optimize the Version Age of Information (VAoI) in a status update system in which a remote Energy Harvesting (EH) Internet of Things (IoT) device samples data and transmits it to a network of interconnected Low Earth Orbit (LEO) satellites for dissemination and utilization. The optimal update policy is derived through stochastic modeling and optimization of the VAoI across the network. The results indicate that this policy reduces the frequency of updates by skipping stale or irrelevant data, significantly improving energy efficiency.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 8","pages":"1928-1932"},"PeriodicalIF":4.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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