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A Dynamic Clustering-Based Hierarchical Federated Learning Scheme in Internet of Vehicles
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-16 DOI: 10.1109/LCOMM.2024.3481674
Lihang Wen;Weijing Qi;Yufeng Lin;Qingyang Song;Lei Guo;Abbas Jamalipour
{"title":"A Dynamic Clustering-Based Hierarchical Federated Learning Scheme in Internet of Vehicles","authors":"Lihang Wen;Weijing Qi;Yufeng Lin;Qingyang Song;Lei Guo;Abbas Jamalipour","doi":"10.1109/LCOMM.2024.3481674","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481674","url":null,"abstract":"Federated learning (FL) can significantly empower the Internet of Vehicles (IoV) by utilizing in-vehicle communications resources and data to construct high-quality models. In this letter, focusing on improving the training efficiency of FL in the IoV scenario with heterogeneous in-vehicle communications resources and datasets, we propose a dynamic clustering-based hierarchical FL scheme. Specifically, dynamic clustering can reduce the adverse effects of heterogeneity and save communication cost during training, while hierarchical aggregation that combines synchronous aggregation within each cluster and asynchronous aggregation among clusters promotes global convergence. The simulation results show that the proposed scheme accelerates the convergence rate by 20.1% – 57.5%, reduces the communication cost by 9.2% – 63.9%, and has better robustness compared with current typical FL schemes.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2935-2939"},"PeriodicalIF":3.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810471","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 Reinforcement Learning Assisted Multi-Operator Spectrum Sharing in Cell-Free MIMO Networks
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-16 DOI: 10.1109/LCOMM.2024.3481450
Minsu Shin;Danish Mehmood Mughal;Sang-Hyo Kim;Min Young Chung
{"title":"Deep Reinforcement Learning Assisted Multi-Operator Spectrum Sharing in Cell-Free MIMO Networks","authors":"Minsu Shin;Danish Mehmood Mughal;Sang-Hyo Kim;Min Young Chung","doi":"10.1109/LCOMM.2024.3481450","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481450","url":null,"abstract":"This letter introduces a deep reinforcement learning (DRL)-assisted multi-operator spectrum sharing methodology in cell-free multi-input multi-output (CF-MIMO) networks. Existing schemes mainly focus on cognitive communications or rely on strong operators’ coordination. Our approach leverages DRL agents at the access points (APs) of each mobile network operator (MNO) for dynamic spectrum sharing across separate frequency bands. These DRL agents operate independently, selecting the spectrum resources from other MNOs’ bands with minimal inter-operator information exchange between the central processing units (CPUs). Performance evaluation under various scenarios demonstrates that DRL agents at APs can effectively learn optimal resource allocation, leading to improvements in delay, network throughput, and user-perceived throughput performance compared to the conventional non-spectrum sharing scheme.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2894-2898"},"PeriodicalIF":3.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810425","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
STAR-RIS-Aided MISO Networks With Multi-User Rate Fairness
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-16 DOI: 10.1109/LCOMM.2024.3481665
Zhichao Sheng;Zihan Song;Hongwen Yu;Ali A. Nasir;Yuanwei Liu
{"title":"STAR-RIS-Aided MISO Networks With Multi-User Rate Fairness","authors":"Zhichao Sheng;Zihan Song;Hongwen Yu;Ali A. Nasir;Yuanwei Liu","doi":"10.1109/LCOMM.2024.3481665","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481665","url":null,"abstract":"This letter considers a simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS)-assisted multiple-input single-output (MISO) system, investigating a computationally efficient approach to achieve rate fairness among users. To achieve fair rate distribution, a joint optimization scheme for the transmitting and reflecting coefficients (TARCs) of STAR-RIS and the transmit beamforming at the base station is proposed. Generally, rate fairness is achieved by solving max-min rate optimization, which is a computationally challenging non-smooth optimization objective. To address this, we adopt a pair of alternative objectives aiming at maximizing the geometric mean (GM) of the users’ rates and the soft minimum rate function. To address the energy conservation constraint for the TARCs and their joint optimization with the transmit beamformers, we propose computationally efficient alternating optimization algorithms. Our proposed algorithms leverage closed-form expressions of scalable complexity for efficient implementation, ensuring practicality in large-scale scenarios. Our simulation results show that the rate-fairness performance of the computationally efficient proposed algorithms is not very far from that of the computationally prohibitive non-smooth max-min rate (MMR) optimization. Moreover, they achieve better sum-rate performance than the conventional MMR optimization.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2925-2929"},"PeriodicalIF":3.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810474","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
A Pairwise Grouping-Based Sparse Mapping for Sparse Vector Transmission
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-15 DOI: 10.1109/LCOMM.2024.3481003
Xuewan Zhang;Yadi Chen;Jingjing Guo
{"title":"A Pairwise Grouping-Based Sparse Mapping for Sparse Vector Transmission","authors":"Xuewan Zhang;Yadi Chen;Jingjing Guo","doi":"10.1109/LCOMM.2024.3481003","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481003","url":null,"abstract":"Sparse vector coding (SVC) is a promising transmission scheme in ultra-reliable and low-latency communications (URLLC) scenario. Its transmission performance primarily depends on the sparse vector construction, namely sparse mapping. In this letter, we first demonstrate the relationship between combination-based and index redefinition (IR)-based sparse mapping of SVC, from which we conclude that the latter has obtained the shortest sparse vectors with the aid of multiple constellation allocation. There is a trade-off between sparse vector length and the number of allocated constellations to construct an SVC scheme with the optimal performance. Based on this, we propose a pairwise grouping-based SVC (PG-SVC) scheme by grouping multiple constellations in pairs to reduce the number of allocated constellations, in which the constellation allocation is determined by specific transmitted bits. This approach ensures sparse vectors of moderate length, as the number of bits determining the sparse vector length is reduced. Simulation results show that the PG-SVC scheme can achieve higher transmission reliability compared to the existing SVC schemes, especially when coding efficiency is high.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2844-2848"},"PeriodicalIF":3.7,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810310","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
Fractional Programming Based Optimization Techniques for RIS-Assisted SWIPT-IoT System
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-15 DOI: 10.1109/LCOMM.2024.3481289
Neha Sharma;Sumit Gautam;Symeon Chatzinotas;Björn Ottersten
{"title":"Fractional Programming Based Optimization Techniques for RIS-Assisted SWIPT-IoT System","authors":"Neha Sharma;Sumit Gautam;Symeon Chatzinotas;Björn Ottersten","doi":"10.1109/LCOMM.2024.3481289","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481289","url":null,"abstract":"This letter addresses two distinctly poised objectives, i.e., data rate and energy harvesting (EH) in Simultaneous Wireless Information and Power Transfer (SWIPT) systems with Reconfigurable Intelligent Surface (RIS) by tackling a weighted objective to maximize data rate, EH, and transmit power utilization for multi-antenna BS and multiple RIS-User scenarios. This approach optimizes power splitting (PS) ratio at the end-user and transmit power using an optimized practical phase-dependent amplitude model for each RIS element reflectivity. Fractional programming-based Dinkelbach and Quadratic transform-related algorithms are proposed and compared with Karush-Kuhn-Tucker (KKT) conditions based solutions. Optimized discrete phase shift (DPS) level has been sought. Numerical results show that deploying more RIS elements and placing them closer together enhances both information rate and EH, whereas it nearly saturates with increasing DPS levels.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2819-2823"},"PeriodicalIF":3.7,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810313","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 Enabled Precoding in Secure Integrated Sensing and Communication Systems
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-15 DOI: 10.1109/LCOMM.2024.3481032
Ruize Li;Chongyu Bao;Lu Chen;Fengjing Wu;Wenchao Xia
{"title":"Deep Learning Enabled Precoding in Secure Integrated Sensing and Communication Systems","authors":"Ruize Li;Chongyu Bao;Lu Chen;Fengjing Wu;Wenchao Xia","doi":"10.1109/LCOMM.2024.3481032","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481032","url":null,"abstract":"This letter investigates the physical layer security of integrated sensing and communication (ISAC) systems, in which a base station (BS) communicates with users and sense targets simultaneously while a eavesdropper attempts to intercept confidential information. We develop an optimization problem for precoding to minimize the maximum eavesdropping signal-to-interference-plus-noise ratio (SINR) while ensuring quality of service (QoS) requirements of communication and sensing. To find its solution, we propose a learning-based precoding scheme that obtains precoding results from uplink pilots and echoes through a neural network without prior channel information. In particular, a newly developed loss function is designed based upon the first-order optimality conditions to take into account the intricate constraints of the ISAC system. Finally, simulation results indicate that the proposed approach effectively reduce the SINR of eavesdroppers while ensuring a satisfactory QoS for communication and sensing performance.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2769-2773"},"PeriodicalIF":3.7,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810492","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
Two RRNS-Based Error Correction Schemes for DNA Storage Channels
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-15 DOI: 10.1109/LCOMM.2024.3481265
Jia Luo;Liwei Mu;Yuanxi Huang;Yonglin Yan;Guojun Han;Yonglin Zhong
{"title":"Two RRNS-Based Error Correction Schemes for DNA Storage Channels","authors":"Jia Luo;Liwei Mu;Yuanxi Huang;Yonglin Yan;Guojun Han;Yonglin Zhong","doi":"10.1109/LCOMM.2024.3481265","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3481265","url":null,"abstract":"This letter proposed two novel error correction strategies that leverage the error correction and deletion correction capabilities of RRNS (redundant residue number system) codes: the RRNS+MSA (multiple sequence comparison) scheme and the RRNS+marker code scheme. These strategies aimed to address the issues of insertion, deletion and substitution in the DNA storage channel. In consideration of the specific characteristics of the DNA storage channel, the proposed study also incorporated the probabilities of deletion and insertion into the original DNA storage channel model. The simulation results demonstrated conclusively that the two error correction schemes proposed in this letter can ensure the reliability of DNA storage information. It is noteworthy that the RRNS+marker code scheme proposed in this letter demonstrated a superior balance between error correction performance and DNA reading cost.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2729-2733"},"PeriodicalIF":3.7,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810478","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
Jamming-Assisted Wireless Information Surveillance With Movable Antenna
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-14 DOI: 10.1109/LCOMM.2024.3479890
Jiacheng Liao;Fengchao Zhu;Guojie Hu
{"title":"Jamming-Assisted Wireless Information Surveillance With Movable Antenna","authors":"Jiacheng Liao;Fengchao Zhu;Guojie Hu","doi":"10.1109/LCOMM.2024.3479890","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3479890","url":null,"abstract":"Movable antenna (MA) is an emerging technology that can significantly enhance the communication capacity by flexibly adjusting the antenna positions to reconstruct wireless channels. In this letter, MA technology is applied for the first time in the field of wireless surveillance, consisting of a suspicious transmitter (ST), a suspicious receiver (SR), a legitimate monitor (E) and a MA-enabled jammer (J). Specifically, J aims to proactively interfere with the SR to reduce the suspicious transmission rate of the ST, so as to facilitate effective eavesdropping by E. Our goal is to maximize the eavesdropping success probability at E by jointly optimizing antenna positions and the jamming beamforming at J. However, the problem is highly non-convex because the mutual coupling between above two variables. To tackle this challenge, we design two schemes to obtain the locally optimal and suboptimal antenna positions. Furthermore, we successfully derive a closed-form result for the critical antenna span. The simulation results show that, compared to the traditional fixed position antenna (FPA), our proposed schemes achieve a significant performance improvement, while the derived critical antenna span approaches the result originated from Monte Carlos.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2739-2743"},"PeriodicalIF":3.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810482","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
Channel Modeling and Performance Analysis of UAV-Enabled Communications With UAV Wobble
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-14 DOI: 10.1109/LCOMM.2024.3480130
Yuhan Dou;Zhuxian Lian;Yajun Wang;Bibo Zhang;Hao Luo;Chuanjin Zu
{"title":"Channel Modeling and Performance Analysis of UAV-Enabled Communications With UAV Wobble","authors":"Yuhan Dou;Zhuxian Lian;Yajun Wang;Bibo Zhang;Hao Luo;Chuanjin Zu","doi":"10.1109/LCOMM.2024.3480130","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3480130","url":null,"abstract":"Because of the influence of wind, unmanned aerial vehicles (UAVs) inevitably experience different degrees of wobble while flying. Considering the impact of effective apertures (EA) on the performance of array antennas, this letter proposes a channel model for UAV-enabled communication systems, which incorporates the UAV’s pitch and yaw, as well as the randomly varying EA caused by the UAV’s wobble and flight posture. The general expression for the average signal-to-noise ratio (ASNR) is derived based on this model. From this general expression, we derive a closed-form expression for the case when the receiver is located directly below the hovering UAV. In deriving this closed-form expression, a method for approximating the general expression using a finite power series is proposed. The numerical results show that even slight wobble of the UAV can severely degrade the performance of the communication system. Moreover, owing to the wobble, increasing the number of antenna elements does not narrow the beamwidth and can’t lead to a significant improvement in ASNR. Furthermore, we find that in a UAV-enabled communication system, neglecting the EA also results in a severe overestimation of the ASNR.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2749-2753"},"PeriodicalIF":3.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810488","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
Channel Estimation for RIS-Assisted Multiuser mmWave Systems With Direct Channels Based on a Novel Space Projection Approach
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-10-14 DOI: 10.1109/LCOMM.2024.3479735
Zhendong Peng;Taihao Zhang;Cunhua Pan;Hong Ren;Maged Elkashlan;Cyril Leung
{"title":"Channel Estimation for RIS-Assisted Multiuser mmWave Systems With Direct Channels Based on a Novel Space Projection Approach","authors":"Zhendong Peng;Taihao Zhang;Cunhua Pan;Hong Ren;Maged Elkashlan;Cyril Leung","doi":"10.1109/LCOMM.2024.3479735","DOIUrl":"https://doi.org/10.1109/LCOMM.2024.3479735","url":null,"abstract":"In this letter, we develop a novel two-stage joint direct and cascaded channel estimation strategy for reconfigurable intelligent surface (RIS)-assisted multi-user multiple-input single-output (MU-MISO) millimeter wave (mmWave) systems based on a novel space projection approach. Specifically, in Stage I, to obtain an equivalent signal for direct channel estimation, we carefully design the phase shifts of the RIS without switching off the RIS. In Stage II, the equivalent signal matrices for estimating the cascaded channels are obtained by employing the orthogonal complement space of the transmitted pilot sequence, which mitigates the component of the direct channels and thus completely prevents error propagation from the direct channels to the cascaded channels. Based on the proposed novel signal pre-processing method, the MU-MISO mmWave channels can be estimated by exploiting the sparsity and correlation. Comprehensive simulation results verify that the proposed method can improve the estimation accuracy and decrease pilot overhead.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2849-2853"},"PeriodicalIF":3.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810312","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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