{"title":"Space-Time Adaptive Beamforming for Satellite Communications: Harnessing Doppler as New Signaling Dimensions","authors":"Hyeongtak Yun, Seyong Kim, Jeonghun Park","doi":"10.1109/twc.2026.3740086","DOIUrl":"https://doi.org/10.1109/twc.2026.3740086","url":null,"abstract":"","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"12 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149086615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xin Chen, Shuai Ma, Youlong Wu, Zhongqiang Zhang, Bo Ren, Biao Hou, Guangming Shi
{"title":"Semantic Space Reorganization for Robust Digital Video Semantic Communication","authors":"Xin Chen, Shuai Ma, Youlong Wu, Zhongqiang Zhang, Bo Ren, Biao Hou, Guangming Shi","doi":"10.1109/twc.2026.3739588","DOIUrl":"https://doi.org/10.1109/twc.2026.3739588","url":null,"abstract":"","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"92 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Evan Allen, Karim Said, Robert Calderbank, Lingjia Liu
{"title":"Communication in a Fractional World: MIMO MC-OTFS Precoder Prediction","authors":"Evan Allen, Karim Said, Robert Calderbank, Lingjia Liu","doi":"10.1109/twc.2026.3737933","DOIUrl":"https://doi.org/10.1109/twc.2026.3737933","url":null,"abstract":"","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"11 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149077945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luca Antonelli, Antonio A. D'Amico, Luca Sanguinetti
{"title":"A Novel Near-Field Dictionary Design for Hybrid MIMO with Uniform Planar Arrays","authors":"Luca Antonelli, Antonio A. D'Amico, Luca Sanguinetti","doi":"10.1109/twc.2026.3737524","DOIUrl":"https://doi.org/10.1109/twc.2026.3737524","url":null,"abstract":"","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"112 1","pages":"1-1"},"PeriodicalIF":10.4,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149077747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mengzhao Guo;Zhi Lin;Ruiqian Ma;Kang An;Chen Han;Yifu Sun;Yuanzhi He;Jiangzhou Wang
{"title":"Breaking the Diagonal Mold: Full-Scattering Matrix Control in BD-RIS for Securing Satellite RSMA","authors":"Mengzhao Guo;Zhi Lin;Ruiqian Ma;Kang An;Chen Han;Yifu Sun;Yuanzhi He;Jiangzhou Wang","doi":"10.1109/TWC.2026.3671685","DOIUrl":"https://doi.org/10.1109/TWC.2026.3671685","url":null,"abstract":"Satellite communications (SatCom) face fundamental security challenges due to their inherent broadcast nature. To address this, we exploit beyond-diagonal reconfigurable intelligent surface (BD-RIS) to unleash its full-scattering matrix control for enhanced secure beamforming flexibility in SatCom with rate-splitting multiple access (RSMA), where the satellite attempts to convey private signals to legitimate users with blocked direct downlinks and multiple eavesdroppers. To maximize the worst-case secrecy rate among legitimate users, a max-min fairness (MMF) problem is formulated with imperfect wiretap channel state information (CSI) via joint precoding, RIS configuration, and rate splitting optimization. By using the block coordinate descent (BCD) method, these optimization variables are decoupled with different subproblems and solved by the penalty dual decomposition (PDD) method iteratively. Furthermore, we develop a computationally efficient suboptimal solution that employs diagonal RIS (D-RIS) with reduced hardware and computational complexity, where alternating optimization (AO) and successive convex approximation (SCA) methods are employed to solve the non-convex problem. Simulation results demonstrate that our proposed BD-RIS-RSMA scheme achieves significant performance improvements compared to baseline schemes, while the suboptimal diagonal RIS scheme offers a favorable performance-complexity tradeoff.","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"25 ","pages":"13575-13589"},"PeriodicalIF":10.7,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147440642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adaptive Interference Management for Enhancing RIS-Assisted NOMA Systems Through Satellite–Terrestrial Links","authors":"Muhammad I. Khalil;Ke Wang;Jinho Choi","doi":"10.1109/TWC.2026.3671050","DOIUrl":"10.1109/TWC.2026.3671050","url":null,"abstract":"This paper proposes an elevation-aware interference management framework for reconfigurable intelligent surface (RIS)-assisted downlink non-orthogonal multiple access (NOMA) in integrated low Earth orbit (LEO) satellite–terrestrial networks. In this setting, the strength of satellite interference varies strongly with the elevation angle due to path loss and shadowing. We model this effect via an elevation-dependent weighting factor <inline-formula> <tex-math>$alpha (theta)$ </tex-math></inline-formula>, expressed as a sigmoid function and updated in real time by a lightweight proportional–integral (PI) controller driven by a scalar performance metric. The resulting <inline-formula> <tex-math>$alpha (theta)$ </tex-math></inline-formula> enables an adaptive successive interference cancellation (SIC) strategy that prioritizes decoding of satellite or terrestrial components according to the instantaneous interference level and omits satellite decoding when its contribution is weak, thereby reducing unnecessary SIC stages. In parallel, a three-mode RIS codebook (terrestrial-priority, balanced, satellite-priority) is selected based on <inline-formula> <tex-math>$alpha (theta)$ </tex-math></inline-formula> and refined online using low-complexity gradient-based phase updates. Simulations under 3GPP-compliant parameters show that the proposed scheme achieves up to 20% higher throughput than a conventional static RIS–NOMA baseline with non-adaptive RIS phases and a fixed channel-gain-based SIC order that does not exploit the elevation-dependent interference weight <inline-formula> <tex-math>$alpha (theta)$ </tex-math></inline-formula>, while maintaining robust performance across a wide range of elevation angles. These results highlight the benefits of combining elevation-aware RIS control, adaptive SIC ordering, and low-overhead online RIS refinement in next-generation satellite–terrestrial NOMA networks.","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"25 ","pages":"13447-13462"},"PeriodicalIF":10.7,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147439701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Free-Space Optical Communication With Optical Intelligent Reflecting Surfaces Under Phase Errors","authors":"Emna Zedini","doi":"10.1109/TWC.2026.3671589","DOIUrl":"10.1109/TWC.2026.3671589","url":null,"abstract":"Free-space optical (FSO) communication systems enhanced with optical intelligent reflecting surfaces (OIRS) offer promising solutions to overcome line-of-sight limitations and mitigate atmospheric turbulence effects. This paper presents a comprehensive analysis of OIRS-assisted FSO systems with phase errors utilizing both heterodyne and intensity modulation with direct detection (IM/DD) methods, which provides a more tractable alternative to existing methods. We first derive exact closed-form formulas for the mean and variance of the squared sum of products of independent, identically distributed Gamma-Gamma random variables, incorporating both pointing errors and IRS phase errors. Based on these results, we approximate the square envelope of the OIRS-assisted FSO channel with a Gamma distribution, with shape and scale terms determined from the derived mean and variance. This approximation allows us to obtain closed-form expressions for key performance metrics, including the average bit-error rate for different modulations, the outage probability, and the ergodic capacity, expressed using the Meijer’s G function. Our approach demonstrates excellent agreement with Monte Carlo simulations while offering superior computational efficiency compared to methods based on multivariate Fox’s H functions. Furthermore, we conduct asymptotic analysis at high signal-to-noise ratios and investigate the system’s diversity order for both heterodyne and IM/DD techniques.","PeriodicalId":13431,"journal":{"name":"IEEE Transactions on Wireless Communications","volume":"25 ","pages":"13479-13493"},"PeriodicalIF":10.7,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147439703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}