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Adjacent Channel Interference Analysis From U-NII-4 and U-NII-5 Devices Into 5G NR V2X Devices 从u - ni -4和u - ni -5设备到5G NR V2X设备的相邻信道干扰分析
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-02-02 DOI: 10.1109/LCOMM.2026.3660155
Mustafa Harun Yılmaz
{"title":"Adjacent Channel Interference Analysis From U-NII-4 and U-NII-5 Devices Into 5G NR V2X Devices","authors":"Mustafa Harun Yılmaz","doi":"10.1109/LCOMM.2026.3660155","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3660155","url":null,"abstract":"The Federal Communications Commission in the U.S. assigned 30 MHz from the 5895-5925 MHz band for vehicular communication. Adjacent bands, i.e., from 5850-5895 MHz and 5925-6425 MHz, were designated for unlicensed devices. In this study, the effect of adjacent channel interference (ACI) from unlicensed devices into 5G new radio (NR) vehicle-to-everything (V2X) devices was investigated at the link and system level simulations. After conducting link level analysis, a downtown congested traffic scenario with 330 vehicles was considered at the system level. An unlicensed device was assumed to operate using either IEEE 802.11ac or 802.11ax standard. At the link level, only the ACI from a U-NII-4 device degrades the performance of 5G NR V2X devices. At the system level, the ACI from U-NII-4 device with 90% duty cycle degrades the performance by 2.5 dB while for all other cases, a single unlicensed device does not affect the 5G NR V2X performance because it is obscured by the interference from the other 5G NR V2X devices using the same subchannels.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1031-1035"},"PeriodicalIF":4.4,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223745","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
Mitigating User Communication Inconsistency Caused by Channel Aging in Scalable Cell-Free Massive MIMO Systems 减少可扩展无小区大规模MIMO系统中信道老化引起的用户通信不一致
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-30 DOI: 10.1109/LCOMM.2026.3659461
Wufeng Kong;Lihua Li;Chenhui Li;Xingwang Li
{"title":"Mitigating User Communication Inconsistency Caused by Channel Aging in Scalable Cell-Free Massive MIMO Systems","authors":"Wufeng Kong;Lihua Li;Chenhui Li;Xingwang Li","doi":"10.1109/LCOMM.2026.3659461","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3659461","url":null,"abstract":"In this letter, we propose the spectral efficiency standard deviation (SESD) as a new metric to evaluate the consistency of user communication experience in scalable cell-free massive multiple input multiple output (CF mMIMO) systems degraded by channel aging. Closed-form expressions of the downlink spectral efficiency (SE) and SESD are derived under channel aging conditions. To minimize SESD while satisfying a given minimum SE requirement associated with different services, we design a joint access point (AP) selection and power allocation scheme. This SESD minimization approach achieves approximately 6% reduction in SESD compared to the conventional sum-rate maximization and fixed allocation methods, effectively mitigating communication fluctuations. Furthermore, by mapping SE stability to the speech Mean Opinion Score (MOS), we show that SESD minimization also effectively improves the consistency of user-perceived quality of experience (QoE).","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1086-1090"},"PeriodicalIF":4.4,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223566","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
TA-UNet: A Satellite Electromagnetic Map Sparse Reconstruction Method With Past Sensing Information 基于过去遥感信息的卫星电磁地图稀疏重建方法
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-30 DOI: 10.1109/LCOMM.2026.3659522
Suting Liu;Zhiyuan Lin;Jin Jin;Ruiqing Wen;Linling Kuang;Guowei Yang
{"title":"TA-UNet: A Satellite Electromagnetic Map Sparse Reconstruction Method With Past Sensing Information","authors":"Suting Liu;Zhiyuan Lin;Jin Jin;Ruiqing Wen;Linling Kuang;Guowei Yang","doi":"10.1109/LCOMM.2026.3659522","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3659522","url":null,"abstract":"Electromagnetic map reconstruction is a critical technology for communication satellites to be aware of the complete electromagnetic situation, serving as a fundamental basis for efficient spectrum sharing in satellite communications. The satellite electromagnetic environment exhibits significant short-term temporal correlation, with sampling points dynamically varying over time. Leveraging these characteristics, we propose a method for sparse reconstruction of satellite electromagnetic maps using past sensing information, and design a neural network, Temporal Attention UNet (TA-UNet). By incorporating a temporal attention mechanism, TA-UNet effectively integrates sensing information from multiple time slots, facilitating more efficient electromagnetic map reconstruction. Experiments demonstrate that past sensing information significantly improves the similarity between the reconstructed map and the ground truth. Moreover, TA-UNet demonstrates superior reconstruction accuracy and real-time performance, outperforming previous methods. Compared with UNet without past sensing information, the reconstruction error is reduced by 12.67% to 62.70%.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1021-1025"},"PeriodicalIF":4.4,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223675","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
RIS-T and RIS-DH Enhanced Dual-Hop Relaying RIS-T和RIS-DH增强双跳中继
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-30 DOI: 10.1109/LCOMM.2026.3659715
Namburi Venkatalakshmi;Bijaylaxmi Das;Hemanta Kumar Sahu
{"title":"RIS-T and RIS-DH Enhanced Dual-Hop Relaying","authors":"Namburi Venkatalakshmi;Bijaylaxmi Das;Hemanta Kumar Sahu","doi":"10.1109/LCOMM.2026.3659715","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3659715","url":null,"abstract":"This letter investigates a dual-hop relaying system enhanced by reconfigurable intelligent surfaces (RISs) deployed at the transmitter side (RIS-T) and the relay–destination link (RIS-DH). Both amplify-and-forward (AF) and decode-and-forward (DF) relaying protocols are considered. An active RIS-assisted RIS-DH configuration is additionally studied to evaluate the effect of signal amplification. Closed-form expressions for the outage probability (OP) and average bit error probability (ABEP) are derived, along with high-SNR asymptotic analysis. The results reveal the impact of RIS placement, relaying strategy, and active RIS operation. Numerical results, supported by Monte Carlo simulations, validate the analysis and show that the joint use of RIS-T and RIS-DH provides notable performance gains over conventional dual-hop relaying. The findings offer useful insights for the design of RIS-assisted dual-hop architectures in future wireless networks.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1012-1016"},"PeriodicalIF":4.4,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175857","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
Simultaneous Multi-Rate Threshold Optimization of Protograph-Based Raptor-Like LDPC Codes via Genetic Algorithm 基于原型的类猛禽LDPC码的多速率阈值同步遗传算法优化
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-29 DOI: 10.1109/LCOMM.2026.3659347
Mehrab Rajabi;Mohammad-Reza Sadeghi
{"title":"Simultaneous Multi-Rate Threshold Optimization of Protograph-Based Raptor-Like LDPC Codes via Genetic Algorithm","authors":"Mehrab Rajabi;Mohammad-Reza Sadeghi","doi":"10.1109/LCOMM.2026.3659347","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3659347","url":null,"abstract":"Protograph-based Raptor-like (PBRL) LDPC codes, adopted in the 5G NR eMBB data channel, support a wide range of code rates by generating incremental redundancy through XOR operations. As the protograph structure directly influences performance, its efficient design is crucial. This letter introduces a novel framework for optimizing the IRC submatrix by minimizing the Euclidean norm of capacity gaps, a new evaluation metric that captures overall threshold behavior across all supported rates, in contrast to the conventional rate-by-rate greedy optimization. The approach formulates this as a global optimization problem solved via a genetic algorithm (GA) with simulated annealing (SA) applied for improved convergence. Numerical results show notable threshold reductions, including a 58.4% improvement in the capacity gap norm for the 5G Base Graph 1. The method is also compatible with other rate-compatible structures, such as rate-compatible spatially coupled LDPC codes, which are promising candidates for coding schemes in next-generation mobile systems.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1017-1020"},"PeriodicalIF":4.4,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175672","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
Optimization of AP Placement and Array Topology for Distributed MIMO Systems Under Near-Field Propagations 近场传播下分布式MIMO系统AP布局和阵列拓扑优化
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-28 DOI: 10.1109/LCOMM.2026.3657376
Yaxin Ren;Yang Zhang;Minghao Shang;Yuan Li;Lihua Pang;Pei Xiao
{"title":"Optimization of AP Placement and Array Topology for Distributed MIMO Systems Under Near-Field Propagations","authors":"Yaxin Ren;Yang Zhang;Minghao Shang;Yuan Li;Lihua Pang;Pei Xiao","doi":"10.1109/LCOMM.2026.3657376","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3657376","url":null,"abstract":"In this letter, we develop a near-field system model for a multi-user distributed multiple-input multiple-output (D-MIMO) system based on a non-uniform spherical wave (NUSW) channel model. The proposed model incorporates key physical characteristics, including the projected aperture of isotropic antenna elements and the radiation pattern of directional antenna elements, to accurately capture near-field effects. To maximize the average system capacity, we propose a meta-heuristic optimization algorithm that alternates between access point (AP) placement and array topology design, effectively reducing computational overhead while achieving near-optimal solutions. Simulation results demonstrate the effectiveness of the proposed approach.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1126-1130"},"PeriodicalIF":4.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299532","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
Optimized Uplink Spectrum Access With Adaptive Interference-Aware User Admission 具有自适应干扰感知用户准入的优化上行频谱接入
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-28 DOI: 10.1109/LCOMM.2026.3658407
Mayank Gupta;Pratik Chakraborty;Shankar Prakriya
{"title":"Optimized Uplink Spectrum Access With Adaptive Interference-Aware User Admission","authors":"Mayank Gupta;Pratik Chakraborty;Shankar Prakriya","doi":"10.1109/LCOMM.2026.3658407","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3658407","url":null,"abstract":"This letter proposes a novel uplink multiple access scheme that accommodates up to <inline-formula> <tex-math>$K$ </tex-math></inline-formula> low data-rate non-priority users (NPUs) within a selected priority user’s (PU) spectrum, without compromising the PU performance. The uplink base station decodes the PU symbol first, followed by the symbols of <inline-formula> <tex-math>$K$ </tex-math></inline-formula> NPUs, employing successive interference cancellation. A dynamic interference threshold limit, set after PU selection, determines <inline-formula> <tex-math>$K$ </tex-math></inline-formula> and NPU powers in closed-form using a novel instantaneous power allocation scheme (IPAS) inspired by underlay cognitive radio. Spectrum utilization is maximized with precise control over NPU target rate and <inline-formula> <tex-math>$K$ </tex-math></inline-formula>. Closed-form throughput analysis, validated via simulations, demonstrates superiority of the suggested scheme over a traditional multiple access employing static optimal power allocation.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1007-1011"},"PeriodicalIF":4.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175698","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
Spatio–Temporal Port Selection in Fluid Antennas Under Switching Delays 切换时延下流体天线的时空端口选择
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-26 DOI: 10.1109/LCOMM.2026.3658190
Daniel Dinis;Risto Wichman
{"title":"Spatio–Temporal Port Selection in Fluid Antennas Under Switching Delays","authors":"Daniel Dinis;Risto Wichman","doi":"10.1109/LCOMM.2026.3658190","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3658190","url":null,"abstract":"Fluid antenna system (FAS) enhance wireless performance by dynamically selecting the best antenna port among many closely spaced ports. However, identifying the optimal port at each time step typically requires measuring all ports, which is costly due to pilot overhead and switching latency that may become a limiting factor in time-varying channels. In this work, we propose a spatio-temporal interpolation framework based on Gaussian processes (GP) that leverages both spatial and temporal channel correlations to estimate the channel response from a small subset of measured ports. Simulation results demonstrate that our approach achieves impressive performance, even outperforming full-port scanning in time-varying channels by effectively denoising through temporal smoothing.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"992-996"},"PeriodicalIF":4.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175601","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 Subchannel and User Scheduling for Wireless Metaverse Services: A Genetic Algorithm-Based Approach 无线元宇宙服务的联合子信道和用户调度：基于遗传算法的方法
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-26 DOI: 10.1109/LCOMM.2026.3658128
Peng Jin;Xi Wang;Jing Xu;Ruikun Luo;Wei Liu
{"title":"Joint Subchannel and User Scheduling for Wireless Metaverse Services: A Genetic Algorithm-Based Approach","authors":"Peng Jin;Xi Wang;Jing Xu;Ruikun Luo;Wei Liu","doi":"10.1109/LCOMM.2026.3658128","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3658128","url":null,"abstract":"The metaverse, offering immersive and interactive experiences, has become a key focus resently. In this letter, we investigate a metaverse wireless communication system incorporating Non-Orthogonal Multiple Access (NOMA). To strike an effective balance between user Quality of Experience (QoE) and system cost, we propose a comprehensive algorithmic framework. Specifically, the problem is decomposed into two subproblems: subchannel allocation and user scheduling. For these, we design a NOMA-based Subchannel Allocation algorithm (NSA) and a Genetic Algorithm-based Joint User and Subchannel Allocation scheme (GA-JUSA), which are executed iteratively to enhance overall performance. Experimental results show that the proposed approach achieves up to a 22.98% improvement over existing methods, highlighting its potential for future applications.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1056-1060"},"PeriodicalIF":4.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223621","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
CG-FKAN: Compressed-Grid Federated Kolmogorov–Arnold Networks for Communication Constrained Environment 通信约束环境下的压缩网格联合Kolmogorov-Arnold网络
IF 4.4 3区 计算机科学
IEEE Communications Letters Pub Date : 2026-01-23 DOI: 10.1109/LCOMM.2026.3657730
Seunghun Yu;Youngjoon Lee;Jinu Gong;Joonhyuk Kang
{"title":"CG-FKAN: Compressed-Grid Federated Kolmogorov–Arnold Networks for Communication Constrained Environment","authors":"Seunghun Yu;Youngjoon Lee;Jinu Gong;Joonhyuk Kang","doi":"10.1109/LCOMM.2026.3657730","DOIUrl":"https://doi.org/10.1109/LCOMM.2026.3657730","url":null,"abstract":"Federated learning (FL), widely used in privacy-critical applications, suffers from limited interpretability, whereas Kolmogorov–Arnold Networks (KAN) address this limitation via learnable spline functions. However, existing FL studies applying KAN overlook the communication overhead introduced by grid extension, which is essential for modeling complex functions. In this letter, we propose CG-FKAN, which compresses extended grids by sparsifying and transmitting only essential coefficients under a communication budget. Experiments show that CG-FKAN achieves up to 13.6% lower RMSE than fixed-grid KAN in communication-constrained settings. In addition, we derive a theoretical upper bound on its approximation error.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"30 ","pages":"1101-1105"},"PeriodicalIF":4.4,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223617","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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