International Journal of Satellite Communications and Networking最新文献

{"title":"Design and Implementation of Transparent Cross-Polarization Interference Compensation in a Wideband Dual-Polarization Satellite Receiver","authors":"Svilen Dimitrov,&nbsp;Vito Dantona,&nbsp;Gerhard Mocker","doi":"10.1002/sat.1533","DOIUrl":"10.1002/sat.1533","url":null,"abstract":"<p>In this paper, simultaneous transmission on two orthogonal antenna polarizations in a polarization division multiplexing (PDM) fashion is studied for wideband satellite communication links using dual-polarization satellite receivers for the purpose of doubling the data rate. In order to mitigate the cross-polarization interference (XPI), a new digital blind and transparent XPI compensation method is proposed, coined as XPI correlation learning estimation and adaptive reduction (XPI-CLEAR). The received signal-to-noise-and-interference ratio (SNIR) and packet-error rate (PER) performance with this non-data-aided and non-decision-directed method is assessed in a comprehensively modelled XPI channel with effects such as depolarization due to atmospheric conditions, imperfect cross-polarization discrimination (XPD) of the antennas at the transmitter and the receiver, memory effects due to frequency selectivity of the XPD, and differential frequency offset (DFO) between the two channels. The application of the XPI-CLEAR method presents considerable energy efficiency improvements for all the studied XPI channel effects, and is particularly beneficial for higher order modulation. A low-complexity hardware implementation with symbol rates up to 500 MBaud validates the XPI-CLEAR method as a practical solution to increase the data rates of the satellite air interface and to achieve the doubling of the throughput of the satellite link by the use of PDM.</p>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 6","pages":"481-492"},"PeriodicalIF":0.9,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/sat.1533","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deeper dive into interoperability and its implications for LunaNet communications and navigation services","authors":"James Schier, Coralí Roura, Phillip E. Paulsen, Karl Vaden, Jennifer Rock, Charles J. Sheehe, Angela Peura, Marc Seibert, Erica Lieb Weir","doi":"10.1002/sat.1531","DOIUrl":"https://doi.org/10.1002/sat.1531","url":null,"abstract":"SummaryThe Artemis program being developed by the United States' (US) National Aeronautics and Space Administration (NASA) is advancing capabilities to return humans to the Moon and establish an initial base camp and associated infrastructure with extensive contributions from international and commercial partners. In planning for cislunar exploration and science missions, space agencies are collaborating to enable communications, networking, and Positioning, Navigation, and Timing (PNT) systems—called LunaNet—to exchange information and provide services to cislunar spacecraft and space systems, thus helping each other to achieve their shared goals. To achieve commonality and lower cost for mutual benefit, the strategy of interoperability is being adopted to help fit all the pieces together and function smoothly. Facilitating interoperability should benefit lunar missions by providing the ability to operate in a collaborative environment similar to the terrestrial Internet. Interoperability allows them to share information, navigate safely despite increasing radio frequency congestion, and follow common processes and procedures for effective joint operations. Unlike prior government‐dominated efforts, this ecosystem is expected to include and benefit for‐profit (commercial) businesses, non‐profit organizations, and academic institutions as active stakeholders. Ultimately, the goal is to enable a cislunar ecosystem of service providers and users to contribute to and/or utilize infrastructure and capabilities to achieve mission objectives that span the full range of human endeavors while supporting a variety of business models. This approach enables a Systems of Systems (SoS), such as a Network of Networks, to be sustainable in the context of the LunaNet ecosystem as systems evolve over time in technologies, standards, components, and user applications. This paper reports on the results of an effort to help frame the development of the international LunaNet architecture by providing a canonical definition of interoperability broad enough to meet these needs, examining architectural and operational implications of the definition, and exploring interoperability strategies and tactics to deploy and evolve the services proposed for cislunar exploration and science missions.","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"52 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A decade of EHF scientific research: Unveiling insights from Alphasat Q/V‐band satellite communication experiments","authors":"Tommaso Rossi, Mauro De Sanctis, Ernestina Cianca, Giuseppe Codispoti, Giorgia Parca, Marina Ruggieri","doi":"10.1002/sat.1532","DOIUrl":"https://doi.org/10.1002/sat.1532","url":null,"abstract":"SummaryIn 2008, the Italian Space Agency (ASI) consolidated its position on research and experiments regarding extremely high frequency (EHF) satellite communication through the proposal to the European Space Agency (ESA) of hosting a Q/V‐band experimental payload on board the Alphasat geostationary satellite. The latter large platform, launched in 2013, thus hosted the so‐called TDP#5 (Technology Demonstration Payload), aimed at performing the first Q/V‐band telecommunication and propagation experimental campaigns. Thanks to the precious contribution given to the definition of the overall mission and the scientific objectives, the payload was then renamed in memory of Professor Aldo Paraboni, pioneer of scientific research on EHF satellite propagation.Since 2014, a large number of satellite communication scientific experiments have been conducted by the University of Rome Tor Vergata, principal investigator for the ASI telecommunication campaign. Due to the excellent scientific results and the high reliability of the system, the experimental campaign is still ongoing. The main objective of the proposed telecommunication experiments is to demonstrate the feasibility of broadband satellite communications in Q/V band, optimizing and assessing, over‐the‐air, the performance of the indispensable adaptive transmission techniques. Moreover, the application of innovative paradigms related to software‐defined networking (SDN) and network functions virtualization (NFV) has been investigated in the framework of satellite systems exploiting beyond Ka‐band frequencies.The goal that drives this experimental activity is to provide to the academic community, manufacturers, and service providers useful tools to cope with Q/V‐band links for future satellite communication systems. The use of EHF links contributes to the reduction of RF front end and thus minimization of orbital junk; moreover, high throughput links in conjunction with software‐driven architectures enable a high level of system reconfigurability that is one of the pillars for a sustainable use of space.The paper presents the main results of the last 10 years of Q/V‐band experiments, as well as the plans and perspectives for future scientific and operational activities in a sustainable space framework.","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"11 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on a user terminal-assisted beam pointing measurement algorithm for very high-throughput satellite systems","authors":"Kaiqiang Qi,&nbsp;Cheng Zhang,&nbsp;Yejun Zhou,&nbsp;Kang Liu","doi":"10.1002/sat.1529","DOIUrl":"10.1002/sat.1529","url":null,"abstract":"<div>\u0000 \u0000 <p>High-throughput satellites play an important role in emergency disaster relief, maritime, and other fields. A new generation of high-throughput satellites with large deployable antennas and broadband beamforming networks, namely, very high-throughput satellites (VHTS), is developing towards hundreds, even thousands of extremely narrow beams with Tbps capacity, which puts forward higher requirements for satellite pointing and system construction costs. In order to solve the problem that those traditional beam pointing measurement and calibration algorithms are difficult to apply or the performance is limited, this paper builds a service beam pointing measurement and calibration architecture. A user terminal-assisted beam pointing measurement algorithm based on the Gauss-Newton method is proposed for the general case, which can effectively reduce the construction cost of onboard and ground pointing measurement system, and improve the measurement accuracies of three axes of the satellite. Simulation results demonstrate the excellent performance under the ideal scenario. To achieve the future engineering application under the non-ideal scenario, the terminal positioning error can be first neglected, then the pattern processing error and the terminal signal measurement error must be reduced by decreasing the pattern sampling interval, increasing the number of participant terminals, and other means. By comparing with a traditional beam pointing measurement algorithm, the proposed algorithm can achieve much lower beam pointing error than the baseline.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 6","pages":"444-460"},"PeriodicalIF":0.9,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141576820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Traffic offloading and resource allocation enabled hybrid satellite-terrestrial networks in cognitive integrated systems using a recurrent neuro-fuzzy model","authors":"Manish Kumar Mishra,&nbsp;Ritesh Kumar Mishra","doi":"10.1002/sat.1530","DOIUrl":"10.1002/sat.1530","url":null,"abstract":"<div>\u0000 \u0000 <p>In recent years, the demand for high-speed and reliable communication networks has grown exponentially. To meet this demand, researchers and engineers have been exploring innovative solutions that combine the benefits of both satellite and terrestrial networks. The complexity of accurately modeling and predicting dynamic network conditions to optimize resource distribution and maintain seamless connectivity. The objective of this work is to develop and implement a recurrent neuro-fuzzy model (RNFM)for optimizing traffic offloading and resource allocation in hybrid satellite-terrestrial networks within cognitive integrated systems. This work, begins with cognitive integrated hybrid satellite-terrestrial networks employing spectrum-sharing techniques. These techniques integrate with software-defined networks (SDN) to facilitate traffic offloading in hybrid satellite-terrestrial networks (H-STN). The process incorporates a second-price sealed-bid auction mechanism to efficiently allocate resources. Joint resource allocation is then optimized using two convex optimization methods. This allocation, in turn, informs the resource allocation strategy. The system further incorporates user behavior analysis and employs a recurrent neuro-fuzzy model with deep feed-forward neural networks to enhance the accuracy and efficiency of the entire process. MATLAB simulation that incorporates adaptive learning algorithms and fuzzy logic to dynamically manage network resources and improve system efficiency. The findings show that the proposed technique outperforms both one-step and multi-step prediction algorithms with an accuracy increase of 99.23%. The future scope for this research is to integrate advanced machine learning algorithms, such as reinforcement learning, with the recurrent neuro-fuzzy model to further enhance dynamic traffic offloading and resource allocation in increasingly complex and heterogeneous satellite-terrestrial network environments.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 6","pages":"461-480"},"PeriodicalIF":0.9,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141576821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artificial intelligence-based data path control in low Earth orbit satellites-driven optical communications","authors":"Andrea Wrona,&nbsp;Andrea Tantucci","doi":"10.1002/sat.1528","DOIUrl":"https://doi.org/10.1002/sat.1528","url":null,"abstract":"<div>\u0000 \u0000 <p>Free space optical communication has emerged as a promising technology for high-speed and secure data transmission between ground stations on Earth and orbiting satellites. However, this communication technology suffers from signal attenuation due to atmospheric turbulence and beam alignment precision. Low Earth orbit satellites play a pivotal role in optical communication due to their low altitude over the Earth surface, which mitigates the atmospheric precipitation effects. This paper introduces a novel data path control law for satellite optical communication exploiting artificial intelligence-based predictive weather forecasting and a node selection mechanism based on reinforcement learning. Extensive simulations on three case studies demonstrate that the proposed control technique achieves remarkable gains in terms of link availability with respect to other state-of-the-art solutions.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 6","pages":"425-443"},"PeriodicalIF":0.9,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Signal-to-noise ratio estimation for broadband satellite-to-ground communication based on time-domain channel impulse response reconstruction","authors":"Yuanfan Zhao,&nbsp;Cheng Ju,&nbsp;Dongdong Wang,&nbsp;Na Liu,&nbsp;Luyang Guan,&nbsp;Peng Xie","doi":"10.1002/sat.1527","DOIUrl":"10.1002/sat.1527","url":null,"abstract":"<div>\u0000 \u0000 <p>Signal-to-noise ratio (SNR) estimation is crucial for spectrum management and data transmission. However, the existing classical methods in satellite-to-ground (SG) communication links, particularly for broadband transmission and under ultra-low SNR conditions, often encounter substantial estimation errors. In this paper, a novel SNR estimation method based on time-domain channel impulse response (CIR) reconstruction is proposed. Least square (LS) algorithm in frequency domain and inverse fast Fourier transform (IFFT) with a rectangular window are employed to reconstructed CIR. The noise energy is calculated by computing the average energy outside the window. The signal power is obtained by subtracting the noise energy from the total energy inside the window. In addition, a numerical simulation with a signal bandwidth of 400 MHz is performed to evaluate the effectiveness of the proposed algorithm in real SG communication scenarios. The simulation results show that compared with existing classical methods, even under ultra-low SNR conditions, the proposed algorithm exhibits more accurate estimation ability and stronger resistance to frequency offset interference in nonterrestrial network (NTN) channels.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 5","pages":"415-422"},"PeriodicalIF":0.9,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141372226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LEO satellite constellations configuration based on the Doppler effect in laser intersatellite links","authors":"Kaouther Boumalek,&nbsp;Skander Aris,&nbsp;Shu Ting Goh,&nbsp;Seyed A. Zekavat,&nbsp;Malek Benslama","doi":"10.1002/sat.1520","DOIUrl":"10.1002/sat.1520","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents low Earth orbit (LEO) satellite constellation configuration based on the performance of Doppler effect in laser intersatellite links (LISLs). It studies the impact of the LEO constellation's parameters on the performance of the Doppler effect in LISLs. The paper aims to develop LEO satellite constellation configurations that evolve LISLs with minimal Doppler shift. It evaluates the impact of the variation of the relative distance, the inclination angle of the LEO constellation orbital planes, the orbital planes number in the LEO constellation, and the altitude on the performance of Doppler wavelength shift (DWS) in LISLs, for different operating laser wavelengths (OLWs) with respect to two possible intersatellite links (ISL) connection modes within the constellation, straight ISL (n-to-n) and inclined ISL (n-to-n − 1). n is the order of the satellite in the orbital plane. Simulations are conducted to evaluate the performance of these configurations in terms of altitude, OLW, inclination angle, and the number of orbital planes. In addition, both OneWeb and Starlink constellations are studied to evaluate DWS performance. The study demonstrates that DWS decreases either with the diminution of the relative distance between linked LEO satellites, the inclination of LEO constellation, and the OLW, or with the augmentation of the orbital planes number and altitude. Moreover, the overall DWS between two LEO satellites in the proposed constellation is at least 50% lower than the constellation configuration in other literature. The paper proposes the LEO constellation's configurations that perform LISLs with less possible Doppler effect by optimizing the LEO constellation parameters that impact the Doppler effect. The result of this study helps in the early stage of LEO satellite constellation designing in terms of payload simplicity and cost.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 5","pages":"397-414"},"PeriodicalIF":0.9,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140932634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Joint altitude and beamwidth optimization for LEO satellite-based IoT constellation","authors":"Hong Tao,&nbsp;Wang Gang,&nbsp;Ding Xiaojin,&nbsp;Zhang Gengxin","doi":"10.1002/sat.1518","DOIUrl":"10.1002/sat.1518","url":null,"abstract":"<div>\u0000 \u0000 <p>Low Earth Orbit (LEO) satellite-based Internet of Things (IoT) has become a hot topic in IoT networks due to the ability of global coverage, especially in remote areas. How to design a commercial LEO satellite-based constellation to meet the IoT traffic requirement remains an open problem. In this paper, we propose a throughput optimization algorithm for LEO satellite-based IoT networks meanwhile reducing the number of LEO satellite. Based on stochastic geometry theory, a closed-form expression is derived for the throughput of a dynamic LEO satellite-based IoT networks when LEO satellite equips with capture effect (CE) receiver and successive interference cancelation (SIC) receiver, respectively. Furthermore, a joint altitude and beamwidth optimization problem is formulated under the constraint of Walker constellation to optimize the throughput and the number of LEO satellites. To solve this multi-objective optimization problem, we design an iterative non-dominated sorting genetic algorithm II (NSGA-II) for the rapid development of IoT traffic. Simulation results show that our proposed algorithm can effectively improve the throughput performance of random access (RA) protocol in LEO satellite-based IoT networks compared to benchmark problems.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 5","pages":"354-373"},"PeriodicalIF":0.9,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140932631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy-efficient physical layer security schemes for low Earth orbit satellite systems","authors":"Satya Chan,&nbsp;Sooyoung Kim,&nbsp;Hee Wook Kim,&nbsp;Bon-Jun Ku,&nbsp;Daesub Oh","doi":"10.1002/sat.1519","DOIUrl":"10.1002/sat.1519","url":null,"abstract":"<p>This paper introduces four proposals to enhance physical layer security (PLS) in low Earth orbit (LEO) satellite systems. The first proposal leverages the Alamouti code aided by artificial noise (AN) and involves the collaborative use of two LEO satellites, ensuring secure downlink transmission. Its efficiency is further enhanced when implementing a power-balanced Alamouti code. The second PLS proposal capitalizes on an reconfigurable intelligent surface (RIS) to introduce interference to potential eavesdroppers. As the RIS manages the reflected channel, this security measure is achieved without necessitating additional transmit power or receiver operations. The third proposal integrates the first and second solutions, resulting in improved secrecy rates compared to the individual proposals, nearly reaching the maximum achievable rate. The fourth proposal is based on a relay-based method, securing all transmission links from the satellite to the relay and from the satellite and relay to the legitimate user. The secrecy performance simulation results presented in the paper demonstrate the remarkable effectiveness of the proposed solutions.</p>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"42 5","pages":"374-396"},"PeriodicalIF":0.9,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/sat.1519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140932835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}