A5088841799- Satellite Communication Systems
- Wireless Communication Networks Research
- Advanced Wireless Communication Techniques
- Advanced MIMO Systems Optimization
- IoT Networks and Protocols
- PAPR reduction in OFDM
- Antenna Design and Optimization
- Advanced Wireless Network Optimization
- Advanced Power Amplifier Design
- Advanced Wireless Communication Technologies
- Interconnection Networks and Systems
- Advanced Optical Network Technologies
- Error Correcting Code Techniques
- Telecommunications and Broadcasting Technologies
- Optical Network Technologies
- Radio Frequency Integrated Circuit Design
- Opportunistic and Delay-Tolerant Networks
- Full-Duplex Wireless Communications
- Cooperative Communication and Network Coding
- Antenna Design and Analysis
- Advanced Data Storage Technologies
- Advanced Photonic Communication Systems
- Age of Information Optimization
- UAV Applications and Optimization
- Cellular Automata and Applications
Universität der Bundeswehr München
2013-2025
National Taiwan University
2023
National Experimental University of the Armed Forces
2015-2017
High throughput satellites employing multibeam antennas and full frequency reuse for broadband satellite services are considered in this paper. Such architectures offer, example, a cost-effective solution to optimize data delivery extend the coverage areas future 5G networks. We propose application of multiple-input-multiple-output (MIMO) technology both feeder link multiuser downlink. Spatial multiplexing different streams is performed common beam. In user links, MIMO with multiple beams...
Direct connectivity in L/S frequency bands between satellites and common mobile terrestrial user equipment (UE), such as smartphones, is an essential feature for future 6G non-terrestrial networks. The technical trend closing the link communication endpoints to develop large phased antenna arrays be launched LEO orbit. Satellite swarms represent innovative promising approach. Swarms are composed of several small lightweight organized a free-flying formation (i.e., wireless connected) or...
With sum throughputs exceeding 1 Tb/s, next-generation high throughput satellite will play a key role in 5G networks for applications including backhauling or broadband in-flight connectivity. Such satellites require the deployment of tens Q/V-band feeder links to support data traffic their uplink. Meanwhile, geographical restrictions and cost considerations significantly constrain search gateway sites. Diversity strategies are, furthermore, necessary cope with strong rain fades. In this...
Satellite direct-to-cell (D2C) connectivity considers the communication between satellites and low-cost handheld devices on Earth. It represents one of most challenging aspects integration terrestrial non-terrestrial networks. Low Earth orbit (LEO), sub-6GHz bands, large aperture satellite antennas are key to enable D2C connectivity. The industry is tackling problem with a conventional approach, consisting design very reflectors or phased arrays. This article proposes new way face problem:...
In this paper, a geographical non-orthogonal multiple access based multiuser beamforming (NOMA-BF) scheme is investigated to improve spectral efficiency in multi-beam satellite-based Internet of Things (IoT), where the primary user per beam needs be timely served with small targeted data rate while other users are opportunistically by using NOMA concept. We first design novel scheduling enhance spectrum efficiency. Then, multi-layer (BF) developed mitigate inter-beam interference, augment...
We investigate the applicability of linear precoding schemes based on Singular Value Decomposition (SVD) to Multiple Input Output (MIMO) single carrier satellite communication systems, where need for high power efficiency requires operate nonlinear amplifiers (HPA) as close possible saturation. Precoded transmit signals have a peak-to-average ratio (PAPR), which might be potentially detrimental system performance channel. compare in this work uncoded 2 × MIMO and an equivalent SISO operating...
The increasing demand for high-rate services over satellite networks has pushed the development of very high throughput satellites. These satellites are in particular characterized by a large transponder bandwidth and use wide carriers, which requires to seriously consider impact linear distortions on link budget. Due lack appropriate mathematical models, manufacturers have resort costly time-consuming simulations estimate distortions. Thus, this paper presents an analytical characterization...
To meet the target requirements of 5G and 6G systems in terms throughput global connectivity, upcoming Low Earth Orbit (LEO) mega-constellations are set to seamlessly integrate into terrestrial communication networks. Although extensively utilized systems, multi-user multiple-input multiple-output (MU-MIMO) transmission has not yet been implemented LEO mega-constellation systems. In this work, we compare performance a MU-MIMO downlink full frequency reuse (FFR) with multibeam system...
The integration of satellites in 5G networks is considered to complement terrestrial infrastructures and offer the availability data rates fulfilling demands future communication systems. This paradigm shift especially brings new challenges for design very high throughput satellites. In this work, interest MIMO technology meet rate requirements with advanced digital satellite payloads discussed. advantages approach both feeder links user next-generation systems are presented.
Summary Very high throughput satellite systems have recently been developed to offer high‐speed connectivity, especially in remote areas, planes, and ships. The data rates can be achieved by using a multibeam approach with an aggressive reuse of the available frequency resources. Due number user beams, system must support large aggregated bandwidth. Multiple‐gateway architectures are necessary solution sustain immense bandwidth requirements. Multiple‐input multiple‐output (MIMO) feeder links...
Non-terrestrial networks (NTNs), particularly satel-lite networks, are key factors for ubiquitous connectivity in today's 5G terrestrial (TNs) and future 6G networks. They can bring great benefits, but also challenges. The direct-to-cell (D2C) use case, i.e., direct from satellites to common low-gain user terminals (UTs), such as handheld or IoT devices, is currently gaining strong interest. This paper focuses on innovative distributed implementations of the space segment using swarms...
Due to the development of high throughput satellites, multicarrier mode operation power amplifiers in satellite transponders is nowadays a growing trend. This tendency poses new challenges design algorithms able mitigate impairments induced by nonlinear behavior such amplifiers. One these construction an accurate low complexity model distorted signals. In this work, simplified Volterra based models transmission chain are considered, and their ability precisely intermodulation distortion at...
A novel analytical formula for the characterization of linear and nonlinear distortions in future ultra high-throughput communication payloads is proposed this work. In context, carrier-to-interference ratio related to single-carrier multicarrier signals derived. Through analysis its behavior valuable insights are created, especially regarding interaction between intersymbol interference. Furthermore, principle dynamic carrier allocation optimization highlighted a realistic scenario. Within...
Ultra high-throughput satellite systems are expected to play an essential role in future beyond 5G and 6G networks. These must remain as flexible possible adapt heterogeneous traffic demands, while also delivering the highest rate for dedicated services. Satellites payloads increasingly employing wideband output multiplexers. In this context, it is now more important than ever evaluate frequency-dependent degradations on multicarrier signals. particular, critical characterize distortions...
Effective routing in satellite mega-constellations has become crucial to facilitate the handling of increasing traffic loads, more complex network architectures, as well integration into 6G networks. To enhance adaptability robustness unpredictable demands, and solve dynamic environments efficiently, machine learning-based solutions are being considered. For control problems, such optimizing packet forwarding decisions according Quality Service requirements maintaining stability, deep...
The fifth generation (5G) Wireless Communication systems development has brought out a paradigm shift using advanced technologies e.g., softwarization, virtualization, Massive MIMO, ultra-densification and introduction of new frequency bands. However, as the societal needs grow, to satisfy UN's Sustainable Development Goals (SDGs), 6G beyond are envisioned. Non- Terrestrial Networks including satellite systems, Unmanned Aerial Vehicles (UAVs) High-Altitude Platforms (HAPs) provide best...
The development of next-generation high throughput satellite systems raises major design challenges, especially for their uplink. To supply data to a large number user beams, tens feeder links in the Q/V-band must be deployed. Moreover, transmit diversity is required cope with strong rain fades experienced this higher range frequencies. address these issues, multiple-input-multiple-output (MIMO) link architecture introduced. By doubling amount supported traffic per link, solution enables...