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MADRL-Based 3D Deployment and User Association of Cooperative mm Wave Aerial Base Stations for Capacity Enhancement

Chinese Journal of Electronics 2023年第2期32卷 283-294页

作者： ZHAO Yikun ZHOU Fanqin FENG Lei LI Wenjing YU Peng State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

Although millimeter-wave aerial base station(m Ae BS) gains rich wireless capacity, it is technically difficult for deploying several m Ae BSs to solve the surge of data traffic in hotspots when considering the amount of interference from neighboring m Ae BS. This paper introduces coordinated multiple points transmission(Co MP) into the m Ae BS-assisted network for capacity enhancement and designs a two-timescale approach for three-dimensional(3D) deployment and user association of cooperative m Ae BSs. Specially, an affinity propagation clustering based m Ae BS-user cooperative association scheme is conducted on a large timescale followed by modeling the capacity evaluation, and a deployment algorithm based on multi-agent(MA) deep deterministic policy gradient(MADDPG) is designed on the small timescale to obtain the 3D position of m Ae BS in a distributed manner. Simulation results show that the proposed approach has significant throughput gains over conventional schemes without Co MP, and the MADDPG is more efficient than centralized deep reinforcement learning(DRL) algorithms in deriving the solution.

关键词： Deep learning Wireless communication Base stations Solid modeling Three-dimensional displays Simulation Interference

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Latest progress for 3GPP ISAC channel modeling standardization

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Science China(Information Sciences) 2024年第11期67卷 357-358页

作者： Yuxiang ZHANG Jianhua ZHANG Yuanpeng PEI Yameng LIU Tao JIANG State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Future Research Laboratory China Mobile Research Institute

Integrated sensing and communication(ISAC) is regarded as a promising technology for sixth-generation(6G) *** channel modeling is essential for designing and evaluating the performance of ISAC systems. In December 2023, the 3rd Generation Partnership Project(3GPP)established a new industry specification group dedicated to ISAC. The group's objective is to research ISAC channel modeling, laying the technical foundations for 6G standardization. Compared to the traditional 5G communication channel, 6G ISAC channel requires accurate modeling of new properties.

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Efficiently Transfer User Profile Across Networks

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IEEE TRANSACTIONS ON BIG DATA 2025年第1期11卷 271-285页

作者： Diao, Mengting Zhang, Zhongbao Su, Sen Gao, Shuai Cao, Huafeng Ye, Junda Beijing Univ Posts ands Telecommun BUPT State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

User profiling has very important applications for many downstream tasks. Most existing methods only focus on modeling user profiles of one social network with plenty of data. However, user profiles are difficult to acquire, especially when the data is scarce. Fortunately, we observed that similar users have similar behavior patterns in different social networks. Motivated by such observations, in this paper, we for the first time propose to study the user profiling problem from the transfer learning perspective. We design two efficient frameworks for User Profile transferring acrOss Networks, i.e., UPON and E-UPON. In UPON, we first design a novel graph convolutional networks based characteristic-aware domain attention model to find user dependencies within and between domains (i.e., social networks). We then design a dual-domain weighted adversarial learning method to address the domain shift problem existing in the transferring procedure. In E-UPON, we optimize UPON in terms of computational complexity and memory. Specifically, we design a mini-cluster gradient descent based graph representation algorithm to shrink the searching space and ensure parallel computation. Then we use an adaptive cluster matching method to adjust the clusters of users. Experimental results on Twitter-Foursquare dataset demonstrate that UPON and E-UPON outperform the state-of-the-art models.

关键词： Social networking (online) Transfer learning Knowledge engineering Computational complexity Clustering algorithms Big Data Adversarial machine learning User profiling transfer learning social network

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Turbulent Single-Scattering Channel Model for Ultraviolet Communications Using Equivalent Scattering Point Approach

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IEEE COMMUNICATIONS LETTERS 2024年第7期28卷 1579-1583页

作者： Chu, Xinyi Yuan, Renzhi Peng, Mugen Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

None-line-of-sight (NLOS) ultraviolet (UV) communication has attracted increasing attention in recent years. The atmospheric turbulence will deteriorate the performance of NLOS UV communications. Existing works on the turbulent model of NLOS UV single-scattering channels only considered the narrow beam cases. In this letter, we propose a turbulent channel model using the equivalent scattering points (ESPs) approach to characterize the fluctuation effect on UV signals under large full-width beam divergence angles and field-of-view angles. An analytical turbulent scintillation index is derived considering the turbulent correlation between different ESPs and is verified by its numerical solutions. Numerical results demonstrate that the turbulent scintillation index will increase with the turbulent correlation distance. Besides, we demonstrate that a large common volume can mitigate the turbulent fluctuation effect on UV communications, which can be explained by an "equivalent spatial diversity effect" due to the large common volume.

关键词： Ultraviolet communication single-scattering model scintillation index turbulent channels Ultraviolet communication single-scattering model scintillation index turbulent channels

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Cost-Aware Resource Allocation for Hybrid Multiple Access in Cell-Free MIMO System

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IEEE COMMUNICATIONS LETTERS 2024年第4期28卷 852-856页

作者： Qin, Wen Meng, Yue Zhang, Zhi Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

In this letter, we investigate the resource allocation problem for multiple access in the cell-free multiple-input multiple-output (CF MIMO) system. To fully utilize multi-dimensional resources and meet the diverse demands of users, we extend the hybrid multiple access technology into the CF MIMO system based on its user-centric architecture, which unifies space division multiple access, non-orthogonal multiple access and orthogonal multiple access. Considering distinct expenses of different multiple access modes at receivers, we design a cost-aware utility function as the metric and develop a cost-aware utilization maximization optimization problem. To address this non-convex combinatorial optimization problem, an iterative resource allocation algorithm is proposed. This algorithm consists of a subchannel allocation algorithm based on matching theory and a power allocation algorithm based on Lagrange dual method. Simulation results validate the superiority of proposed scheme over fixed multiple access schemes.

关键词： Cell-free MIMO resource allocation hybrid multiple access matching theory

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Distributed adaptive prescribed-time orbit containment control for satellite cluster flight

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Chinese Journal of Aeronautics 2024年第8期37卷 342-357页

作者： Tingting ZHANG Shijie ZHANG Huayi LI Xiangtian ZHAO Research Center of Satellite Technology Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

The distributed prescribed-time orbit containment control for the satellite cluster flight with multiple dynamic leaders is *** directed information communication topology between followers is taken into account in the overall *** the satellite mass is assumed to be constant,a distributed prescribed-time orbit containment controller is,firstly,presented to drive the followers into the dynamic convex hull produced by multiple ***,the parameter uncertainty is considered,and a prescribed-time sliding mode estimator is introduced to estimate the desired velocity of each *** on the estimated state,a novel distributed adaptive prescribed-time orbit containment control scheme is *** Lyapunov stability theory is utilized to prove the prescribed-time stability of the closed-loop ***,several numerical simulations and comparison of different control methods are provided to verify the effectiveness and superiority of the proposed control method.

关键词： Satellite cluster Orbit containment control Prescribed-time control Parameter uncertainty Directed communication graph

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FINT: Freshness-Based In-Band Network-Wide Telemetry in Resource-Constrained Environments

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IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT 2025年第2期22卷 1314-1329页

作者： Zhong, Peiran Zhou, Fanqin Feng, Lei Li, Wenjing Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

A new network monitoring technology called in-band network telemetry (INT) offers users the ability to gather precise, real-time data about the entire network. While several studies have used in-band network telemetry for network-wide monitoring, it is insufficient for the growing number of massive networks that are resource-constrained. Finding the most valuable information with the least amount of resources is challenging. In this paper, We formalize the problem of in-band network-wide telemetry with low resource overheads. This formalized problem aims to achieve high freshness of network performance data using fewer resources and reducing deployment and maintenance costs for O&M personnel. We propose a heuristic method based on path reorganization to address this issue. The heuristic algorithm for planning paths starts from greedy path planning results and finds a more appropriate planning scheme by merging and reorganizing paths. Additionally, probabilistic insertion is considered to reduce the impact of intrusiveness of in-band network telemetry. Simulation results show that our approach is effective in improving resource utilization and reducing the cost of monitoring the network compared to similar studies.

关键词： Age of information data plane programmability in-band network telemetry (INT) in-band network telemetry (INT) network management network management P4 P4 P4

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Channel Estimation for Holographic MIMO: Wavenumber-Domain Sparsity-Inspired Approaches

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IEEE WIRELESS COMMUNICATIONS LETTERS 2024年第8期13卷 2305-2309页

作者： Guo, Yuqing Chen, Yuanbin Wang, Ying Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

This letter investigates the sparse channel estimation for holographic multiple-input multiple-output (HMIMO) systems. Given that the wavenumber-domain representation is based on a series of Fourier harmonics that are in essence a series of orthogonal basis functions, a novel wavenumber-domain sparsifying basis is designed to expose the sparsity inherent in HMIMO channels. Furthermore, by harnessing the beneficial sparsity in the wavenumber domain, the sparse estimation of HMIMO channels is structured as a compressed sensing problem, which can be efficiently solved by our proposed wavenumber-domain orthogonal matching pursuit (WD-OMP) algorithm. Finally, numerical results demonstrate that the proposed wavenumber-domain sparsifying basis maintains its detection accuracy regardless of the number of antenna elements and antenna spacing. Additionally, in the case of antenna spacing being much less than half a wavelength, the wavenumber-domain approach remains highly accurate in identifying the significant angular power of HMIMO channels.

关键词： Antennas Channel estimation Transmitters Receivers Matching pursuit algorithms MIMO communication Channel models Holographic MIMO wavenumber domain channel estimation compressed sensing

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Transmit Beamforming Design for Multi-UE Multi-Target ISAC Systems

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IEEE WIRELESS COMMUNICATIONS LETTERS 2024年第11期13卷 3094-3098页

作者： Qiu, Ouyang Zhang, Jiupeng Yan, Shi Peng, Mugen Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

This letter proposes an integrated sensing and communication (ISAC) beamforming method that senses multiple moving targets while simultaneously communicating with multiple user equipment (UE). The radar estimation rate is combined with the communication achievable rate to assess ISAC system performance. Semidefinite relaxation (SDR) and successive convex approximation (SCA) are used to handle the non-convex rank constraint and convexify the objective function, respectively. To reduce the computational complexity, a manifold-based algorithm is proposed as an alternative. Simulation results validate the effectiveness of the proposed schemes.

关键词： Array signal processing Radar Estimation Robot sensing systems Integrated sensing and communication Signal to noise ratio Measurement ISAC beamforming design radar estimation rate

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airTac: A Contactless Digital Tactile Receptor for Detecting Material and Roughness via Terahertz Sensing

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PROCEEDINGS OF THE ACM ON INTERACTIVE MOBILE WEARABLE AND UBIQUITOUS TECHNOLOGIES-IMWUT 2024年第3期8卷 1-37页

作者： Zhang, Zhan Song, Denghui Zhou, Anfu Ma, Huadong Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing Peoples R China

Tactile sensing is an indispensable capability for humans or intelligent devices to engage in complex physical interactions. Mainstream tactile sensors are contact-based, which show limitation in measuring deformable objects and demanding high maintenance effort. As a complementary solution, a new paradigm of contactless tactile sensing is attracting much interest. While promising, they can only identify coarse-grained single tactile perception properties, either material type or surface roughness. In this paper, we propose airTac, which includes a novel contactless digital tactile receptor model, capable of simultaneously extracting these two basic tactile properties in a fine-grained resolution, by harnessing the massive bandwidth of terahertz(THz) frequency band. airTac is designed based on our key finding: while the impact of material type and surface roughness on THz signal intertwine with each other, they are actually separable, i.e., roughness manifests a certain pattern in distorting relative high-frequency components of the whole THz spectrum. Therefore, we custom-design a bio-inspired deep neural network model to decouple the intertwined THz signal, and distill the tactile perception properties embedded underlying the signal. We prototype airTac using a THz time domain spectroscopy, and perform extensive evaluation over 9 different daily material types with 39 different surface roughness. airTac achieves a material identification accuracy of 97.43% and a roughness classification accuracy of 91.46%, which demonstrates that airTac can identify common materials in daily life and exceed a fingertip spatial resolution of 1mm.

关键词： tactile sensing contactless sensing terahertz sensing tactile perception computing model contactless digital tactile receptor

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