Explanipedia

Deep Learning-Based Joint Uplink-Downlink CSI Acquisition for Next-Generation Upper Mid-Band Systems Open

Xuan He, Wenjin Wang, Jin Shi, Björn Ottersten · 2025

In next-generation wireless communication systems, the newly designated upper mid-band has attracted considerable attention, also called frequency range 3 (FR3), highlighting the need for downlink (DL) transmission design, which fundamenta…

Asynchronous Risk-Aware Multi-Agent Packet Routing for Ultra-Dense LEO Satellite Networks Open

Ke He, Thang X. Vu, Le He, Lisheng Fan, Symeon Chatzinotas , et al. · 2025

The rise of ultra-dense LEO constellations creates a complex and asynchronous network environment, driven by their massive scale, dynamic topologies, and significant delays. This unique complexity demands an adaptive packet routing algorit…

Unlocking Symbol-Level Precoding Efficiency Through Tensor Equivariant Neural Network Open

Jinshuo Zhang, Yafei Wang, Xinping Yi, Wenjin Wang, Shi Jin , et al. · 2025

Although symbol-level precoding (SLP) based on constructive interference (CI) exploitation offers performance gains, its high complexity remains a bottleneck. This paper addresses this challenge with an end-to-end deep learning (DL) framew…

Interference in Spectrum-Sharing Integrated Terrestrial and Satellite Networks: Modeling, Approximation, and Robust Transmit Beamforming Open

Wenjing Cao, Yafei Wang, Tianxiang Ji, Tianyang Cao, Wenjin Wang , et al. · 2025

This paper investigates robust transmit (TX) beamforming from the satellite to user terminals (UTs), based on statistical channel state information (CSI). The proposed design specifically targets the mitigation of satellite-to-terrestrial …

STAR-RIS-Enhanced NOMA-Aided Overlay Multiuser Cognitive Satellite-Terrestrial Networks With Discrete Phase Shifts Design Open

Vibhum Singh, Sourabh Solanki, Rakesh Palisetty, Carlos Luís Marcos Rojas, Juan A. Vásquez-Peralvo , et al. · 2025

GNN-Enabled Precoding for Massive MIMO LEO Satellite Communications Open

H. Zhou, Xinrui Gong, Christos G. Tsinos, Li You, Xiqi Gao , et al. · 2025

Low Earth Orbit (LEO) satellite communication is a critical component in the development of sixth generation (6G) networks. The integration of massive multiple-input multiple-output (MIMO) technology is being actively explored to enhance t…

UAV-Assisted 5G Networks: Mobility-Aware 3D Trajectory Optimization and Resource Allocation for Dynamic Environments Open

Asad Mahmood, Thang X. Vu, Wali Ullah Khan, Symeon Chatzinotas, Björn Ottersten · 2025

This work proposes a framework for the robust design of UAV-assisted wireless networks that combine 3D trajectory optimization with user mobility prediction to address dynamic resource allocation challenges. We proposed a sparse second-ord…

Geographical Fairness in Multi-RIS-Assisted Networks in Smart Cities: A Robust Design Open

Progress Zivuku, Abuzar B. M. Adam, Konstantinos Ntontin, Steven Kisseleff, Vu Nguyen Ha , et al. · 2025

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Non-Diagonal versus Diagonal RIS Architectures in Nakagami-<i>m</i> Fading Channels Open

Mostafa Samy, Hayder Al-Hraishawi, Abuzar B. M. Adam, Madyan Alsenwi, Symeon Chatzinotas , et al. · 2025

Pinching Antenna Systems Versus Reconfigurable Intelligent Surfaces in mmWave Open

Mostafa Samy, Hayder Al-Hraishawi, Madyan Alsenwi, Abuzar B. M. Adam, Symeon Chatzinotas , et al. · 2025

Spatio-Temporal Predictive Learning Using Crossover Attention for Communications and Networking Applications Open

Ke He, Thang X. Vu, Lisheng Fan, Symeon Chatzinotas, Björn Ottersten · 2025

This paper investigates the spatio-temporal predictive learning problem, which is crucial in diverse applications such as MIMO channel prediction, mobile traffic analysis, and network slicing. To address this problem, the attention mechani…

A Vision, Survey, and Roadmap Toward Space Communications in the 6G and Beyond Era Open

Konstantinos Ntontin, Eva Lagunas, Jorge Querol, Junaid ur Rehman, Joël Grotz , et al. · 2025

Resource Allocation for RIS-Enhanced OFDM-MIMO ISAC Systems Open

Progress Zivuku, Nhan T. Nguyen, Symeon Chatzinotas, Björn Ottersten · 2025

A Bistatic ISAC Framework for LEO Satellite Systems: A Rate-Splitting Approach Open

Juha Park, Jaehyup Seong, Yijie Mao, Wonjae Shin, Björn Ottersten · 2025

LEO Satellite-Enabled Random Access with Large Differential Delay and Doppler Shift Open

Boxiao Shen, Yongpeng Wu, Wenjun Zhang, Symeon Chatzinotas, Björn Ottersten · 2024

This paper investigates joint device identification, channel estimation, and symbol detection for LEO satellite-enabled grant-free random access systems, specifically targeting scenarios where remote Internet-of-Things (IoT) devices operat…

Beyond Diagonal RIS-Aided Networks: Performance Analysis and Sectorization Tradeoff Open

Mostafa Samy, Hayder Al-Hraishawi, Abuzar B. M. Adam, Symeon Chatzinotas, Björn Ottersten · 2024

Reconfigurable intelligent surfaces (RISs) have emerged as a spectrum- and energy-efficient technology to enhance the coverage of wireless communications within the upcoming 6G networks. Recently, novel extensions of this technology, refer…

Channel-Coded Precoding for Multi-User MISO Systems Open

Ly V. Nguyen, Junil Choi, Björn Ottersten, A. Lee Swindlehurst · 2024

Precoding is a critical and long-standing technique in multi-user communication systems. However, the majority of existing precoding methods do not consider channel coding in their designs. In this paper, we consider the precoding problem …

Enhancing Indoor and Outdoor THz Communications with Beyond Diagonal-IRS: Optimization and Performance Analysis Open

Asad Mahmood, Thang X. Vu, Symeon Chatzinotas, Björn Ottersten · 2024

CoFAR Clutter Estimation Using Covariance-Free Bayesian Learning Open

Kunwar Pritiraj Rajput, Bhavani Shankar M. R., Kumar Vijay Mishra, Muralidhar Rangaswamy, Björn Ottersten · 2024

CoFAR Clutter Estimation using Covariance-Free Bayesian Learning Open

Kunwar Pritiraj Rajput, Bhavani Shankar M. R., Kumar Vijay Mishra, Muralidhar Rangaswamy, Björn Ottersten · 2024

A cognitive fully adaptive radar (CoFAR) adapts its behavior on its own within a short period of time in response to changes in the target environment. For the CoFAR to function properly, it is critical to understand its operating environm…

Massive MIMO-OTFS-Based Random Access for Cooperative LEO Satellite Constellations Open

Boxiao Shen, Yongpeng Wu, Shiqi Gong, Heng Liu, Björn Ottersten , et al. · 2024

This paper investigates joint device identification, channel estimation, and symbol detection for cooperative multi-satellite-enhanced random access, where orthogonal time-frequency space modulation with the large antenna array is utilized…

Joint Power Allocation and Beam Scheduling in Beam-Hopping Satellites: A Two-Stage Framework With a Probabilistic Perspective Open

Lin Chen, Linlong Wu, Eva Lagunas, Anyue Wang, Lei Lei , et al. · 2024

Beam-hopping (BH) technology, integral to multi-beam satellite systems, adapts beam activation to the variable communication demands of terrestrial users. The optimization of power allocation and beam illumination scheduling constitutes th…

Ubiquitous Integrated Sensing and Communications for Massive MIMO LEO Satellite Systems Open

Li You, Yongxiang Zhu, Xiaoyu Qiang, Christos G. Tsinos, Wenjin Wang , et al. · 2024

The next sixth generation (6G) networks are envisioned to integrate sensing\nand communications in a single system, thus greatly improving spectrum\nutilization and reducing hardware costs. Low earth orbit (LEO) satellite\ncommunications c…

Integrating Multiple RIS for Enhanced SWIPT-IoTPerformance: Optimization Strategies Open

Neha Sharma, Sumit Gautam, Symeon Chatzinotas, Björn Ottersten · 2024

Resource Allocation for Geographical Fairness in Multi-RIS-Aided Outdoor-to-Indoor Communications Open

Progress Zivuku, Steven Kisseleff, Konstantinos Ntontin, Anastasios Papazafeiropoulos, Abuzar B. M. Adam , et al. · 2024

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Guest Editorial Space Communications New Frontiers: From Near Earth to Deep Space Open

Riccardo De Gaudenzi, Björn Ottersten, Ana I. Pérez-Neira, Halim Yanıkömeroğlu, Thomas Heyn , et al. · 2024

[No abstract available]

ACCURATE SOURCE LOCALIZATION - THEORETICAL AND EXPERIMENTAL RESULTS Open

Björn Ottersten, Mats Viberg · 2024

Enhancing Indoor and Outdoor THz Communications with Beyond Diagonal-IRS: Optimization and Performance Analysis Open

Asad Mahmood, Thang X. Vu, Symeon Chatzinotas, Björn Ottersten · 2024

This work investigates the application of Beyond Diagonal Intelligent Reflective Surface (BD-IRS) to enhance THz downlink communication systems, operating in a hybrid: reflective and transmissive mode, to simultaneously provide services to…

Integrated Communications and Localization for Massive MIMO LEO Satellite Systems Open

Li You, Xiaoyu Qiang, Yongxiang Zhu, Fan Jiang, Christos G. Tsinos , et al. · 2024

Integrated communications and localization (ICAL) will play an important part in future sixth generation (6G) networks for the realization of Internet of Everything (IoE) to support both global communications and seamless localization. Mas…

Risk-Aware Antenna Selection for Multiuser Massive MIMO Under Incomplete CSI Open

Ke He, Thang X. Vu, Dinh Thai Hoang, Diep N. Nguyen, Symeon Chatzinotas , et al. · 2024

This paper investigates the antenna selection problem in massive multiple-input multiple-out (MIMO) systems under incomplete channel state information (CSI), with a particular interest on risk-aware planning subjected to practical constrai…

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