Science China Information Sciences最新文献_第3页

Near-field channel estimation for extremely large-scale Terahertz communications 超大规模太赫兹通信的近场信道估计

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-19 DOI: 10.1007/s11432-023-4077-8

Songjie Yang, Yizhou Peng, Wanting Lyu, Ya Li, Hongjun He, Zhongpei Zhang, Chau Yuen

{"title":"Near-field channel estimation for extremely large-scale Terahertz communications","authors":"Songjie Yang, Yizhou Peng, Wanting Lyu, Ya Li, Hongjun He, Zhongpei Zhang, Chau Yuen","doi":"10.1007/s11432-023-4077-8","DOIUrl":"https://doi.org/10.1007/s11432-023-4077-8","url":null,"abstract":"Future Terahertz communications exhibit significant potential in accommodating ultra-high-rate services. Employing extremely large-scale array antennas is a key approach to realize this potential, as they can harness substantial beamforming gains to overcome the severe path loss and leverage the electromagnetic advantages in the near field. This paper proposes novel estimation methods designed to enhance efficiency in Terahertz widely-spaced multi-subarray (WSMS) systems. Initially, we introduce three sparse channel representation methods: polar-domain representation (PD-R), multi-angular-domain representation (MAD-R), and two-dimensional polar-angular-domain representation (2D-PAD-R). Each method is meticulously developed for near-field WSMS channels, capitalizing on their sparsity characteristics. Building on this, we propose four estimation frameworks using the sparse recovery theory: polar-domain estimation (PD-E), multi-angular-domain estimation (MAD-E), two-stage polar-angular-domain estimation (TS-PAD-E), and two-dimensional polar-angular-domain estimation (2D-PAD-E). Particularly, 2D-PAD-E, integrating a 2D dictionary process, and TS-PAD-E, with its sequential approach to angle and distance estimation, stand out as particularly effective for near-field angle-distance estimation, enabling decoupled calculation of these parameters. Overall, these frameworks provide versatile and efficient solutions for WSMS channel estimation, balancing low complexity with high-performance outcomes. Additionally, they represent a fresh perspective on near-field signal processing.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"19 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The quantum Ising model for perfect matching and solving it with variational quantum eigensolver 完美匹配的量子伊辛模型及其变分量子求解器的求解

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-19 DOI: 10.1007/s11432-023-4039-y

Qilin Zheng, Pingyu Zhu, Chao Wu, Miaomiao Yu, Weihong Luo, Ping Xu

{"title":"The quantum Ising model for perfect matching and solving it with variational quantum eigensolver","authors":"Qilin Zheng, Pingyu Zhu, Chao Wu, Miaomiao Yu, Weihong Luo, Ping Xu","doi":"10.1007/s11432-023-4039-y","DOIUrl":"https://doi.org/10.1007/s11432-023-4039-y","url":null,"abstract":"Obtaining all perfect matchings of a graph is a tough problem in graph theory, and its complexity belongs to the #P-Complete class. The problem is closely related to combinatorics, marriage matching problems, dense subgraphs, the Gaussian boson sampling, chemical molecular structures, and dimer physics. In this paper, we propose a quadratic unconstrained binary optimization formula of the perfect matching problem and translate it into the quantum Ising model. We can obtain all perfect matchings by mapping them to the ground state of the quantum Ising Hamiltonian and solving it with the variational quantum eigensolver. Adjusting the model’s parameters can also achieve the maximum or minimum weighted perfect matching. The experimental results on a superconducting quantum computer of the Origin Quantum Computing Technology Company show that our model can encode 2n dimensional optimization space with only O(n) qubits consumption and achieve a high success probability of the ground state corresponding to all perfect matchings. In addition, the further simulation results show that the model can support a scale of more than 14 qubits, effectively resist the adverse effects of noise, and obtain a high success probability at a shallow variational depth. This method can be extended to other combinatorial optimization problems.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"73 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Interference mitigation and target detection for automotive FMCW radar with range-Doppler sparse regularization 采用测距-多普勒稀疏正则化的汽车 FMCW 雷达的干扰缓解和目标检测

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-16 DOI: 10.1007/s11432-024-4110-4

Yan Huang, Yunxuan Wang, Xiao Zhou, Hui Zhang, Yuan Mao, Guisheng Liao, Wei Hong

引用次数: 0

Data delivery delay and cross-layer packet size analysis for reliable transmission of Licklider transmission protocol in space networks 空间网络中 Licklider 传输协议可靠传输的数据传输延迟和跨层数据包大小分析

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-16 DOI: 10.1007/s11432-024-4091-6

Guannan Yang, Ruhai Wang, Kanglian Zhao, Wenfeng Li, Dong Yan

{"title":"Data delivery delay and cross-layer packet size analysis for reliable transmission of Licklider transmission protocol in space networks","authors":"Guannan Yang, Ruhai Wang, Kanglian Zhao, Wenfeng Li, Dong Yan","doi":"10.1007/s11432-024-4091-6","DOIUrl":"https://doi.org/10.1007/s11432-024-4091-6","url":null,"abstract":"Delay/disruption tolerant networking (DTN) is proposed as a networking architecture to overcome challenging space communication characteristics for reliable data transmission service in presence of long propagation delays and/or lengthy link disruptions. Bundle protocol (BP) and Licklider Transmission Protocol (LTP) are the main key technologies for DTN. LTP red transmission offers a reliable transmission mechanism for space networks. One of the key metrics used to measure the performance of LTP in space applications is the end-to-end data delivery delay, which is influenced by factors such as the quality of spatial channels and the size of cross-layer packets. In this paper, an end-to-end reliable data delivery delay model of LTP red transmission is proposed using a roulette wheel algorithm, and the roulette wheel algorithm is more in line with the typical random characteristics in space networks. The proposed models are validated through real data transmission experiments on a semi-physical testing platform. Furthermore, the impact of cross-layer packet size on the performance of LTP reliable transmission is analyzed, with a focus on bundle size, block size, and segment size. The analysis and study results presented in this paper offer valuable contributions towards enhancing the reliability of LTP transmission in space communication scenarios.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"36 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Fairness in machine learning: definition, testing, debugging, and application 机器学习的公平性：定义、测试、调试和应用

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-15 DOI: 10.1007/s11432-023-4060-x

Xuanqi Gao, Chao Shen, Weipeng Jiang, Chenhao Lin, Qian Li, Qian Wang, Qi Li, Xiaohong Guan

引用次数: 0

Achieving full mutualism with massive passive devices for multiuser MIMO symbiotic radio 利用海量无源设备实现多用户多输入多输出共生无线电的完全互操作性

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-15 DOI: 10.1007/s11432-024-4066-7

Jingran Xu, Zhuoyin Dai, Yong Zeng, Shi Jin, Tao Jiang

{"title":"Achieving full mutualism with massive passive devices for multiuser MIMO symbiotic radio","authors":"Jingran Xu, Zhuoyin Dai, Yong Zeng, Shi Jin, Tao Jiang","doi":"10.1007/s11432-024-4066-7","DOIUrl":"https://doi.org/10.1007/s11432-024-4066-7","url":null,"abstract":"Symbiotic radio (SR) is one of the attractive communication technologies to facilitate large-scale Internet of Things (IoT) connections with enhanced energy and spectrum efficiency, where passive backscatter devices (BDs) modulate their information over the radio frequency (RF) signals emitted by the active primary transmitters (PTs). Meanwhile, the primary transmission can be strengthened with the additional multipaths created by BDs. To capitalize to a greater extent on the mutualism relationship between the two types of communication, this paper studies multiple-input multiple-output (MIMO) SR communication systems including multiple PTs and massive BDs. We derive the achievable rate expressions of each PT and BD, as well as the sum rate expressions of primary and secondary communication, respectively. Then asymptotic analysis is given to derive the active and passive communication rates with a large number of BDs. Furthermore, for the general case with a finite number of BDs, we study the precoding optimization problem to maximize the sum rate of primary communication, while ensuring that the sum rate of secondary communication and the individual rate for each PT and BD in the prescribed active and passive user sets satisfy the specified thresholds. Simulation results are presented to verify the analytical studies.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"14 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Nonsingularity of grain-like cascade feedback shift registers subject to fault attacks 受故障攻击的粒状级联反馈移位寄存器的非奇异性

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-12 DOI: 10.1007/s11432-023-4044-8

Haitao Li, Zhaoqi Liu, Wenrong Li

引用次数: 0

Flexible printed three dimensional (3D) integrated carbon nanotube complementary metal oxide semiconductor (CMOS) thin film transistors and circuits 柔性印刷三维（3D）集成碳纳米管互补金属氧化物半导体（CMOS）薄膜晶体管和电路

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-08-08 DOI: 10.1007/s11432-023-3933-7

Zhaofeng Chen, Jiaqi Li, Min Li, Hongxuan Guo, Jianwen Zhao

{"title":"Flexible printed three dimensional (3D) integrated carbon nanotube complementary metal oxide semiconductor (CMOS) thin film transistors and circuits","authors":"Zhaofeng Chen, Jiaqi Li, Min Li, Hongxuan Guo, Jianwen Zhao","doi":"10.1007/s11432-023-3933-7","DOIUrl":"https://doi.org/10.1007/s11432-023-3933-7","url":null,"abstract":"The threshold voltage modulation of carbon nanotube thin-film transistors (TFTs) and flexible three-dimensional (3D) integration circuits has become hot research topics for carbon-based electronics. In this paper, a doping-free gate electrode technology is introduced to significantly modulate the threshold voltage of polymer-sorted semiconducting single-walled carbon nanotube (sc-SWCNT) TFTs in combination with the highly effective gate-controlling ability of solid-state electrolyte thin films as the dielectrics. A systematic investigation was conducted on the impact of printed silver, evaporated silver, and evaporated aluminum (Al) gate electrodes on the threshold voltage of flexible printed bottom-gate and top-gate SWCNT TFTs. The results indicate that the SWCNT TFTs with Al gate electrodes exhibit enhancement-mode characteristics with excellent electrical properties, such as the negative threshold voltages (−0.6 V), high Ion/Ioff (up to 106), low subthreshold swing (61.4 mV · dec−1), and small hysteresis. It is attributed to either the formation of lower work function thin films (Al2O3) at the electrode/dielectric layer interfaces through the natural oxidation of the Al bottom-gate electrodes or the dipole reaction of the Al top-gate electrodes from X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) data. In addition, 3D complementary metal-oxide-semiconductor (CMOS) inverters with common gate electrodes were constructed using the resulting enhancement-mode P-type SWCNT TFTs and matched N-type SWCNT TFTs, which shows high voltage gain (34), rail-to-rail output and high noise margins (80.04%, VDD = −1 V) as well good mechanical flexibility at low operation voltages. It demonstrates that SWCNT TFTs have great advantages for building large-scale 3D flexible integrated circuits.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"66 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

SDCC: software-defined collective communication for distributed training SDCC：用于分布式培训的软件定义集体通信

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-31 DOI: 10.1007/s11432-023-3894-4

Xin Jin, Zhen Zhang, Yunshan Jia, Yun Ma, Xuanzhe Liu

引用次数: 0

Dynamic event-triggered fault-tolerant cooperative resilient tracking control with prescribed performance for UAVs 具有规定性能的无人飞行器动态事件触发容错合作弹性跟踪控制

IF 8.8 2区计算机科学

Science China Information Sciences Pub Date : 2024-07-25 DOI: 10.1007/s11432-023-4099-x

Rong Yuan, Zhengcai An, Shuyi Shao, Mou Chen, Mihai Lungu

{"title":"Dynamic event-triggered fault-tolerant cooperative resilient tracking control with prescribed performance for UAVs","authors":"Rong Yuan, Zhengcai An, Shuyi Shao, Mou Chen, Mihai Lungu","doi":"10.1007/s11432-023-4099-x","DOIUrl":"https://doi.org/10.1007/s11432-023-4099-x","url":null,"abstract":"In this paper, a resilient tracking control scheme with cooperative collision avoidance performance is studied for the fixed-wing unmanned aerial vehicle (UAV) leader-follower formation in the presence of actuator failures and external disturbances. Firstly, based on the control objectives of UAV formation tracking and collision avoidance, the transformation tracking errors are obtained using the prescribed performance control technique. Next, a fault detection mechanism is introduced to determine if there is the actuator fault. Subsequently, the event-triggered resilient fault observers are designed based on a dynamic event-triggered mechanism to estimate actuator faults. Furthermore, the prescribed performance functions and the H∞ performance index are employed to ensure the UAV formation collision-free and mitigate the impact of disturbances. Moreover, the resilient controller is designed to minimize the effect of the perturbations for the control gain and the fault observer gain on the system. The stability of the system is also proven through the Lyapunov stability analysis, and the controller gains are calculated by solving the linear matrix inequality. Finally, the validity of the proposed control strategy is demonstrated by the simulation analysis.","PeriodicalId":21618,"journal":{"name":"Science China Information Sciences","volume":"41 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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