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STAR-RIS Aided Communication System With Movable Antennas Exploiting Statistical CSI
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-20 DOI: 10.1109/LCOMM.2025.3544059
Yunan Sun;Hao Xu;Boyu Ning;Lipeng Zhu;Chongjun Ouyang;Hongwen Yang
{"title":"STAR-RIS Aided Communication System With Movable Antennas Exploiting Statistical CSI","authors":"Yunan Sun;Hao Xu;Boyu Ning;Lipeng Zhu;Chongjun Ouyang;Hongwen Yang","doi":"10.1109/LCOMM.2025.3544059","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3544059","url":null,"abstract":"Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) and movable antenna (MA) are two promising technologies to reshape wireless channels and improve communication performance. To reap their synergic gains, this letter investigates a STAR-RIS aided communication system with MAs to maximize the ergodic sum-rate of multiple users by exploiting statistical channel state information (CSI). To tackle this problem, an efficient algorithm based on the alternating optimization (AO) and fractional programming (FP) framework is proposed to jointly optimize the transmission and reflection coefficients (TRCs) at the STAR-RIS, the beamformer, and the positions of MAs at base station. Numerical results show that each individual technology has a limited control over the wireless channel conditions, but combining STAR-RIS and MA can further boost the ergodic sum-rate.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"824-828"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818041","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 Method for Estimating the Resources Required by URLLC Users
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-20 DOI: 10.1109/LCOMM.2025.3543911
Yuan Zhang;Weiwei Liao
{"title":"A Method for Estimating the Resources Required by URLLC Users","authors":"Yuan Zhang;Weiwei Liao","doi":"10.1109/LCOMM.2025.3543911","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543911","url":null,"abstract":"This work studies the persistence scheduling strategy to achieve the statistical latency requirement of ultra-reliable and low latency communication (URLLC) in the finite blocklength regime. The statistical latency model is established by using the stochastic network calculus (SNC) theory. The formulas calculating the upper and lower bounds of the resources required by URLLC users in the persistent scheduling framework are derived. The formula describing the tradeoff between the reliability and latency performance requirements given the allocated resources is also derived. Numerical results verify the correctness of the proposed formulas.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"814-818"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818042","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
3D Channel Modeling and Analysis of Channel Statistical Properties for UAVs Based on Different Distributions
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-20 DOI: 10.1109/LCOMM.2025.3544023
Rongchen Sun;Lingyang Meng;Zhiguo Sun;Zhenduo Wang
{"title":"3D Channel Modeling and Analysis of Channel Statistical Properties for UAVs Based on Different Distributions","authors":"Rongchen Sun;Lingyang Meng;Zhiguo Sun;Zhenduo Wang","doi":"10.1109/LCOMM.2025.3544023","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3544023","url":null,"abstract":"This letter proposes a novel three-dimensional geometry-based stochastic model (GBSM) for multiple-input-multiple-output (MIMO) channels in unmanned aerial vehicle (UAV) air-to-ground (A2G) communication systems. To address the limited consideration of complex urban environments in existing UAV models, this model specifically accounts for the significant impact of ground objects on A2G communications and analyzes how different ground scatterer distributions affect signal propagation. The study examines the effects of UAV angle and altitude on the statistical characteristics of the channel. Results indicate that channel correlation is closely tied to UAV angle and altitude, with Gaussian and uniform scatterer distributions impacting channel statistics differently. Simulation results exhibit high consistency with measurement data, providing a more accurate framework for the design and performance analysis of UAV communication systems.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"819-823"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817951","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
Design of a Dual-Level Polar-Coded Scheme for GCI-DCSK Systems
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-20 DOI: 10.1109/LCOMM.2025.3543856
Yu Zhou;Liang Lv;Dingfei Ma;Yunye Li;Yi Fang
{"title":"Design of a Dual-Level Polar-Coded Scheme for GCI-DCSK Systems","authors":"Yu Zhou;Liang Lv;Dingfei Ma;Yunye Li;Yi Fang","doi":"10.1109/LCOMM.2025.3543856","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543856","url":null,"abstract":"In this letter, we present a polar-coded scheme tailored to enhance transmission reliability in generalized carrier index differential chaos shift keying (GCI-DCSK) systems. Considering the reliability difference between the index and modulated layers in GCI-DCSK, we develop a dual-level polar-coded modulation (DLC-PCM) scheme that provides unequal error protection (UEP). Furthermore, to better manage the reliability differences among index bits in the GCI-DCSK system, we propose a dual-level bit-interleaved polar-coded modulation (DLC-BIPCM) scheme by incorporating a bit-interleaved coded modulation (BICM) structure within the index layer. Additionally, we derive log-likelihood ratio (LLR) expressions and calculate the capacities of both the index and modulated layers to strategically guide the design of the DLC-PCM scheme. Simulation results demonstrate that our proposed polar-coded approach achieves superior bit error rate (BER) performance and lower complexity compared to existing low-density parity-check (LDPC)-based schemes.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"804-808"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817917","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-Aware Gradient Descent Bit-Flipping Algorithm for LDPC Codes
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-20 DOI: 10.1109/LCOMM.2025.3543897
Woohong Min;Kyeongcheol Yang
{"title":"Channel-Aware Gradient Descent Bit-Flipping Algorithm for LDPC Codes","authors":"Woohong Min;Kyeongcheol Yang","doi":"10.1109/LCOMM.2025.3543897","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543897","url":null,"abstract":"The gradient descent bit-flipping with momentum (GDBF-w/M) and probabilistic GDBF-w/M (PGDBF-w/M) algorithms significantly improve the decoding performance of the bit-flipping (BF) algorithm. In this letter, we propose a channel-aware GDBF-w/M algorithm which operates deterministically based on the received values from the additive white Gaussian noise (AWGN) channel. Numerical results show that the proposed algorithm does not only mitigate the error-floor phenomenon of the GDBF-w/M algorithm, but it also has better decoding performance than the PGDBF-w/M algorithm without the need for a random number generator. Furthermore, the complexity of the proposed algorithm is slightly higher than that of the GDBF-w/M algorithm.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"809-813"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818043","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
Improving Multicast Networks Throughput via Joint Multicast Beamforming and Rate Aware Instantly Decodable Network Coding
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-19 DOI: 10.1109/LCOMM.2025.3543587
Zhonghui Mei
{"title":"Improving Multicast Networks Throughput via Joint Multicast Beamforming and Rate Aware Instantly Decodable Network Coding","authors":"Zhonghui Mei","doi":"10.1109/LCOMM.2025.3543587","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543587","url":null,"abstract":"The throughput of multicast networks depends not only on the transmission rate, but also on the number of receivers simultaneously served by the transmit signal. In this letter, we develop a cross-layer approach based on joint multicast beamforming and rate aware instantly decodable network coding (J-MB-RA-IDNC), where instantly decodable network coding (IDNC) is employed at the network layer to increase the number of receivers to be served simultaneously, multicast beamforming is used at the physical layer to direct the beam toward the targeted receivers of the selected rate aware IDNC (RA-IDNC) schedule to improve the transmission rate. Simulation results demonstrate the effectiveness of our proposed scheme.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"794-798"},"PeriodicalIF":3.7,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818044","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
CrossNet: Joint Channel Estimation and Localization in Deep Learning Method
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-19 DOI: 10.1109/LCOMM.2025.3543579
Chongyang Li;Tianqian Zhang;Shouyin Liu
{"title":"CrossNet: Joint Channel Estimation and Localization in Deep Learning Method","authors":"Chongyang Li;Tianqian Zhang;Shouyin Liu","doi":"10.1109/LCOMM.2025.3543579","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543579","url":null,"abstract":"This letter proposes CrossNet, a novel deep learning (DL) approach for joint channel estimation and outdoor localization. Similar to fingerprint methods that utilize features such as angle of arrival (AoA) and receive signal strength indicator (RSSI), CrossNet leverages neural networks to extract positional information from channel state information (CSI). However, instead of relying on direct matching within a database, CrossNet learns the implicit relationship between CSI and location through training, enabling more accurate and robust localization. The purpose of joint channel estimation and localization is to obtain more precise positioning information from more accurate channel estimation. We built a single-input single-output (SISO) downlink communication system on the DeepMIMO dataset and generated the necessary data for our experiments. We conducted multiple comparative experiments to evaluate the performance of CrossNet. Extensive comparative experiments demonstrated that CrossNet effectively utilizes pilots for user equipment (UE) localization and significantly improves localization accuracy through joint channel estimation.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"789-793"},"PeriodicalIF":3.7,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818025","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
On Performance of Cooperative Satellite-AAV-Secured Reconfigurable Intelligent Surface Systems With Phase Errors
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-19 DOI: 10.1109/LCOMM.2025.3543732
Anh-Tu Le;Thai-Hoc Vu;Tan N. Nguyen;Bui Vu Minh;Miroslav Voznak
{"title":"On Performance of Cooperative Satellite-AAV-Secured Reconfigurable Intelligent Surface Systems With Phase Errors","authors":"Anh-Tu Le;Thai-Hoc Vu;Tan N. Nguyen;Bui Vu Minh;Miroslav Voznak","doi":"10.1109/LCOMM.2025.3543732","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543732","url":null,"abstract":"This work studies the secrecy outage performance (SOP) of a reconfigurable intelligent surface (RIS)-empowered satellite-autonomous aerial vehicle (AAV) networks, where multiple antennas satellite communicates with its legitimate destination via a decode-and-forward AAV combined with an RIS in the presence of the eavesdropper. Considering the satellite channels and the terrestrial channels obeying Shadowed-Rician fading and Nakagami-m fading, respectively, the existence of the direct connections between AAV and ground terminals, and the imperfection of phase-shift alignment at RIS, we develop an information-theoretic framework to evaluate the SOP in terms of approximate and asymptotic manners. These guide the system engineering insights, including the configuration of bit control at RISs and the transmit power slope. Numerical results not only corroborate the efficacy of the developed framework but also characterize the SOP behaviour under variation of shadowing effects, RIS configurations, direct or non-direct communication scenarios, and AAV’s trajectory in 3D cylindrical coordinates.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"799-803"},"PeriodicalIF":3.7,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817953","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
Robust Beamforming for Uplink RSMA in UAV Communication Systems With Jittering 有抖动的无人机通信系统中上行链路 RSMA 的稳健波束成形
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-18 DOI: 10.1109/LCOMM.2025.3543284
Jian Ouyang;Yuting Lu;Chengyang Liu;Biao Ma;Min Lin
{"title":"Robust Beamforming for Uplink RSMA in UAV Communication Systems With Jittering","authors":"Jian Ouyang;Yuting Lu;Chengyang Liu;Biao Ma;Min Lin","doi":"10.1109/LCOMM.2025.3543284","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543284","url":null,"abstract":"This letter investigates a robust beamforming (BF) scheme for a rate-splitting multiple access-enabled unmanned aerial vehicle (UAV) uplink communication system under jittering effects. Considering multiple two-user pairs, we formulate a worst-case achievable sum rate maximization problem by jointly optimizing the transmit power of ground users and the receive BF of UAV. The difficulties of this problem arise from the complex trigonometric form of the angle-of-arrival (AoA) uncertainties caused by UAV jitter. To address these challenges, we first derive an approximation method based on the second-order Taylor series expansion to simplify the AoA uncertainties, and then convert the resulting random quadratic forms into deterministic forms by applying S-Procedure. Based on these, we propose a penalty function-based successive convex approximation algorithm to obtain a suboptimal solution to the original problem. Simulation results demonstrate the robustness and superiority of the proposed robust BF scheme.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"769-773"},"PeriodicalIF":3.7,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821231","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 Hybrid Quantum-Classical Machine Learning Approach for Self-Interference Cancellation in Full-Duplex Transceivers
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2025-02-18 DOI: 10.1109/LCOMM.2025.3543318
Mohamed Elsayed;Octavia A. Dobre
{"title":"A Hybrid Quantum-Classical Machine Learning Approach for Self-Interference Cancellation in Full-Duplex Transceivers","authors":"Mohamed Elsayed;Octavia A. Dobre","doi":"10.1109/LCOMM.2025.3543318","DOIUrl":"https://doi.org/10.1109/LCOMM.2025.3543318","url":null,"abstract":"This letter proposes a hybrid quantum-classical machine learning (ML) approach for self-interference cancellation (SIC) in full-duplex transceivers. The proposed approach exploits a quantum long short-term memory (QLSTM) layer, integrated with a classical convolutional layer, to perform the non-linear SIC. QLSTM replaces the neural networks in the classical LSTM gates with variational quantum circuits, acting as feature extractors. Simulation results confirm the superiority of the proposed hybrid quantum-classical ML approach by achieving a significantly higher SIC performance than its fully classical counterpart at similar memory and computational requirements.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 4","pages":"774-778"},"PeriodicalIF":3.7,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817919","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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