This paper proposes a #distributionally #robust #optimization (#DRO) model to minimize, under uncertain latency probability distributions, the expected worst-case overall task routing delay from source to target user equipment through satellite constellation. The model addresses undetermined #uploading and #downloading latency between automobiles, satellites, and user equipment by employing the #Wasserstein #ambiguity #set, allowing for unpredictable vehicle mobility and intermittent connections. By reformulating the problem into a tractable form, the authors determine the optimal routing path for #task #uploading, #satellite #constellation, and #task #downloading. Ultimately, the performance of the proposed DRO model demonstrates the model’s ability to address the challenges of integrated satellite-terrestrial network routing.----Kai-Chu Tsai, Lei Fan, Ricardo Lent, Li-Chun Wang, @Zhu Han More details can be found at this link: https://lnkd.in/gn2tEe9H
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In this paper, the vehicle movement is uncertain introducing the #intermittent #connectivity related to vehicles. Therefore, the authors propose a #distributionally #robust #optimization (#DRO) model to minimize, under uncertain latency probability distributions, the expected worst-case overall task routing delay from source to target user equipment through satellite constellation. The model addresses undetermined uploading and downloading latency between automobiles, satellites, and user equipment by employing the #Wasserstein #ambiguity #set, allowing for unpredictable vehicle mobility and intermittent connections. By reformulating the problem into a tractable form, they determine the #optimal #routing #path for #task #uploading, #satellite #constellation, and #task #downloading. ---- Kai-Chu Tsai, Lei Fan, Ricardo Lent, Li-Chun Wang, Zhu Han More details can be found at this link: https://lnkd.in/eh9fqPgj
Distributionally Robust Optimal Routing for Integrated Satellite-Terrestrial Networks Under Uncertainty
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💠[#SIM] An emerging #Stacked #Intelligent #Metasurface (SIM) technology consisting of multiple metasurfaces is capable of carrying out signal processing and computations naturally as electromagnetic waves pass through it, without causing additional latency and energy consumption. SIM offers a solution for ultra-fast downlink beamforming in the wave domain, which is beneficial for reducing processing delays in #satellite #communication systems. Recently, a SIM-enabled downlink satellite communication system has been developed to perform the #wave-#domain #beamforming relying on #statistical #channel #state #information (#CSI). To serve multiple users in the area with a higher sum rate, the authors proposed an effective user grouping method and an antenna selection scheme. ---- Merouane Debbah More details can be found at this link: https://lnkd.in/gKy8EaHa Please watch the presentation video at this link: https://lnkd.in/g3tRMVQQ
Stacked Intelligent Metasurface Enabled LEO Satellite Communications Relying on Statistical CSI
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#Low #earth #orbit (#LEO) satellite communication systems have gained increasing attention as a crucial supplement to terrestrial wireless networks due to their extensive coverage area. This letter presents a novel system design for LEO satellite systems by leveraging #stacked #intelligent #metasurface (#SIM) technology. Specifically, the lightweight and energy-efficient SIM is mounted on a satellite to achieve multiuser beamforming directly in the electromagnetic wave domain, which substantially reduces the processing delay and computational load of the satellite compared to the traditional digital beamforming scheme. To overcome the challenges of obtaining instantaneous #channel #state #information (#CSI) at the transmitter and maximize the system's performance, a joint power allocation and SIM phase shift optimization problem for maximizing the ergodic sum rate is formulated based on statistical CSI, and an #alternating #optimization (#AO) algorithm is customized to solve it efficiently. Additionally, a user grouping method based on channel correlation and an antenna selection algorithm are proposed to further improve the system performance. ---- Jiancheng An, Merouane Debbah More details can be found at this link: https://lnkd.in/gKy8EaHa
Stacked Intelligent Metasurface Enabled LEO Satellite Communications Relying on Statistical CSI
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#Low #earth #orbit (#LEO) satellite communication systems have gained increasing attention as a crucial supplement to terrestrial wireless networks due to their extensive coverage area. This letter presents a novel system design for LEO satellite systems by leveraging #stacked #intelligent #metasurface (#SIM) technology. Specifically, the lightweight and energy-efficient SIM is mounted on a satellite to achieve multiuser beamforming directly in the electromagnetic #wave #domain, which substantially reduces the processing delay and computational load of the satellite compared to the traditional digital beamforming scheme. To overcome the challenges of obtaining instantaneous #channel #state #information (#CSI) at the transmitter and maximize the system’s performance, a joint power allocation and SIM phase shift optimization problem for maximizing the ergodic sum rate is formulated based on statistical CSI, and an #alternating #optimization (#AO) algorithm is customized to solve it efficiently. Additionally, a user grouping method based on channel correlation and an antenna selection algorithm are proposed to further improve the system performance. ---- Shining Lin, Jiancheng An, Lu Gan, Mérouane Debbah, Chau Yuen More details can be found at this link: https://lnkd.in/gKy8EaHa
Stacked Intelligent Metasurface Enabled LEO Satellite Communications Relying on Statistical CSI
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This survey provides an holistic overview of opportunistic #Low #Earth #Orbit (#LEO)-#Positioning, #Navigation, and #Timing (#PNT) and an exhaustive review of the academic work in the field. Error sources and challenges with respect to the development of operational systems are evaluated, and the state-of-the-art performance is analyzed. System-level strategies to mitigate the error sources and challenges are identified, including the combination of opportunistic LEO-PNT with #Global #Navigation #Satellite #Systems (#GNSS) or other sensors, or the use of base stations. Future research directions, such as the investigation of non-accuracy related #KPIs, the required receiver hardware, or the use in #low #SNR scenarios, are derived.----Winfried Stock, @Robert T. Schwarz, @Christian A. Hofmann, Andreas Knopp More details can be found at this link: https://lnkd.in/gvpHg3qx
Survey On Opportunistic PNT With Signals From LEO Communication Satellites
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This paper focuses on the design of a satellite-based service that broadcast the open access corrections for #Precise #Point #Positioning (#PPP) generated by the #International #Global #Navigation #Satellite #Systems (#GNSS) #Service (#IGS) being appropriate for real-time applications. The proposed system is based on the Argentinian geostationary satellite ARSAT 2 capable of providing service to Latin America. The system requirements and specifications are defined in order to deliver a good quality of service reducing the complexity and the cost of the users receivers. Thoroughly analyzes and calculations carried out demonstrate that, adopting practical design criteria, a low-cost implementation is possible. The authors present the main characteristics of the uplink ground station and downlink user receivers. Moreover, different user receiver architectures as well as the design of a simple antenna are proposed. ---- Ramón López La Valle, Ernesto Lopez, Javier Garcia More details can be found at this link: https://lnkd.in/eTCh6hAR
Low-Cost Satellite-Based Correction Service for Precise Point Positioning in Latin America
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This study perform video signal transmissions via an FPGA-based #free-#space #optical (#FSO) communication prototype to investigate the feasibility of an FSO link with a distance of up to 20 km. The authors use a channel emulator to reliably model turbulence, scintillation, and power attenuation of the long-range FSO channel. They use the FPGA-based real-time SDR prototype to process the transmitted and received video signals. Their study also presents the channel-generation process of a given long-distance FSO link. ---- Hong-Bae Jeon More details can be found at this link: https://lnkd.in/gMEHHzaz
Free-Space Optical Communications for 6G Wireless Networks: Challenges, Opportunities, and Prototype Validation
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Dual-band GNSS (L1 + L5) in modern communication networks can significantly enhance timing accuracy and reliability, crucial for 5G networks. It overcomes challenges like jamming and multipath errors faced by traditional single-band GNSS. The adoption of this technology could be a key factor in boosting network performance and ensures future-proof product development.
Discover the "Benefits of modernized GNSS signals for timing applications in communication networks" in this article by Paula Syrjärinne, PhD, Manager Timing Product Development at u-blox and Samuli Pietilä, Director Product Line Management at u-blox: https://ow.ly/Jetr50Qlq7b #GNSS #Timing electronique-news
Benefits of modernised GNSS signals for timing applications in communications networks
electronics-usa.com
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This paper attempts to provide an initial assessment of the feasibility and potential gains of #adaptive #wideband #cellular #systems operating across the upper mid-band. The study includes: (1) a detailed ray tracing simulation to assess potential gains of multi-band systems in a representative dense urban environment and illustrate the value of a wideband system with dynamic frequency selectivity; (2) an evaluation of potential cross-interference between satellites and terrestrial cellular services and interference nulling to reduce that interference; and (3) design and evaluation of a compact multi-band antenna array structure. Leveraging these preliminary results, we identify potential future research directions to realize next-generation systems in these frequencies. ---- Seongjoon Kang, Marco Mezzavilla, Sundeep Rangan, Arjuna Madanayake, Satheesh Bojja Venkatakrishnan, Grégory Hellbourg, Monisha Ghosh, Hamed Rahmani, Aditya Dhananjay More details can be found at this link: https://lnkd.in/eRKpiu3R
Cellular Wireless Networks in the Upper Mid-Band
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Existential necessity of the mother satellite. Launching the satellite into space to create global technology communication. Does all the global technology become useful, does it create symmetry and technology exchange based on receiving and sending signals? Are all the signal transmitting devices located on the substrate and under the substrate? Earth is connected to the satellite, or are all the signals received by the mother satellite from electronic devices on the ground, or is this signal transmission function performed based on global filtering? Is it possible to decode the code signal of the mother satellite..... ......?!
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AI Research Intern | Signal Processing, Deep Learning, Computer Vision, Python
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