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Toward Mobile Satellite Internet:The Fundamental Limitation of Wireless Transmission and Enabling Technologies 认领 引用 被引量：1
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作者 Wenjin Wang Yiming Zhu +2 位作者 Yafei Wang Rui Ding Symeon Chatzinotas 《Engineering》 SCIE EI CSCD 2025年第11期42-51,共10页
1.Introduction It has been almost 60 years since the launch of Intelsat-I,the world’s first commercial satellite communications system.Over the past few decades,the development of satellite communications has been dr... 1.Introduction It has been almost 60 years since the launch of Intelsat-I,the world’s first commercial satellite communications system.Over the past few decades,the development of satellite communications has been driven by both technological advancements and growing application demands,which have given rise to three primary services:broadcast,fixed satellite,and mobile satellite services[1]. 展开更多
关键词 technological advancements application demands mobile satellite internet broadcast services fixed satellite services satellite communications mobile satellite services wireless transmission
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DDoS Attack Tracking Using Multi-Round Iterative Viterbi Algorithm in Satellite Internet 认领 引用 被引量：1
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作者 Guo Wei Xu Jin +2 位作者 Pei Yukui Yin Liuguo Feng Wei 《China Communications》 SCIE EI CSCD 2025年第3期148-163,共16页
Satellite Internet(SI)provides broadband access as a critical information infrastructure in 6G.However,with the integration of the terrestrial Internet,the influx of massive terrestrial traffic will bring significant ... Satellite Internet(SI)provides broadband access as a critical information infrastructure in 6G.However,with the integration of the terrestrial Internet,the influx of massive terrestrial traffic will bring significant threats to SI,among which DDoS attack will intensify the erosion of limited bandwidth resources.Therefore,this paper proposes a DDoS attack tracking scheme using a multi-round iterative Viterbi algorithm to achieve high-accuracy attack path reconstruction and fast internal source locking,protecting SI from the source.Firstly,to reduce communication overhead,the logarithmic representation of the traffic volume is added to the digests after modeling SI,generating the lightweight deviation degree to construct the observation probability matrix for the Viterbi algorithm.Secondly,the path node matrix is expanded to multi-index matrices in the Viterbi algorithm to store index information for all probability values,deriving the path with non-repeatability and maximum probability.Finally,multiple rounds of iterative Viterbi tracking are performed locally to track DDoS attack based on trimming tracking results.Simulation and experimental results show that the scheme can achieve 96.8%tracking accuracy of external and internal DDoS attack at 2.5 seconds,with the communication overhead at 268KB/s,effectively protecting the limited bandwidth resources of SI. 展开更多
关键词 DDoS tracking iterative Viterbi algorithm satellite Internet 6G
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SC-GAN:A Spectrum Cartography with Satellite Internet Based on Pix2Pix Generative Adversarial Network 认领 引用 被引量：1
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作者 Zhen Pan Zhang Bangning +2 位作者 Wang Heng MaWenfeng Guo Daoxing 《China Communications》 SCIE EI CSCD 2025年第2期47-61,共15页
The increasing demand for radioauthorized applications in the 6G era necessitates enhanced monitoring and management of radio resources,particularly for precise control over the electromagnetic environment.The radio m... The increasing demand for radioauthorized applications in the 6G era necessitates enhanced monitoring and management of radio resources,particularly for precise control over the electromagnetic environment.The radio map serves as a crucial tool for describing signal strength distribution within the current electromagnetic environment.However,most existing algorithms rely on sparse measurements of radio strength,disregarding the impact of building information.In this paper,we propose a spectrum cartography(SC)algorithm that eliminates the need for relying on sparse ground-based radio strength measurements by utilizing a satellite network to collect data on buildings and transmitters.Our algorithm leverages Pix2Pix Generative Adversarial Network(GAN)to construct accurate radio maps using transmitter information within real geographical environments.Finally,simulation results demonstrate that our algorithm exhibits superior accuracy compared to previously proposed methods. 展开更多
关键词 electromagnetic situation Pix2Pix generative adversarial network radio map satellite internet spectrum cartography
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A Novel Orthogonal LoRa Multiple Access Algorithm for Satellite Internet of Things 认领 引用 被引量：6
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作者 Chengwen Zhang Liankai Wang +3 位作者 Libin Jiao Shipeng Wang Jun Shi Jia Yue 《China Communications》 SCIE CSCD 2022年第3期279-289,共11页
In recent years,LoRa has been extensively researched in the satellite Internet of Things(IoT).However,the multiple access technology of LoRa is still one of the bottlenecks of satellite IoT.To improve the multiple acc... In recent years,LoRa has been extensively researched in the satellite Internet of Things(IoT).However,the multiple access technology of LoRa is still one of the bottlenecks of satellite IoT.To improve the multiple access performance of LoRa satellite IoT,based on the orthogonality of LoRa symbols in the fractional domain,this paper proposes a low complexity Orthogonal LoRa Multiple Access(OLMA)algorithm for multiple LoRa users occupying the same frequency bandwidth.The algorithm introduces the address code to divide the fractional bandwidth into multiple parts,and the OLMA users with different address codes occupy different parts to transmit the information code,thus avoiding mutual interference caused by collisions in the same frequency bandwidth.The multiple access capability of OLMA can be flexibly configured only by simply adjusting the length of the address code according to the actual application requirements of data transmission.Theoretical analysis and simulation results show that the OLMA algorithm can greatly improve the multiple access capability and the total transmission bit rate of LoRa IoT without changing the existing LoRa modulation parameters and process. 展开更多
关键词 LoRa satellite Internet of Things multiple access fractional domain linear frequency modulation
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Power-Domain Collision-Tolerant Random Access Method with Auxiliary Beam for Satellite Internet of Things:A New Solution 认领 引用
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作者 Xu Yuanyuan Liu Ziwei +1 位作者 Bian Dongming Zhang Gengxin 《China Communications》 SCIE CSCD 2024年第8期236-248,共13页
There are numerous terminals in the satellite Internet of Things(IoT).To save cost and reduce power consumption,the system needs terminals to catch the characteristics of low power consumption and light control.The re... There are numerous terminals in the satellite Internet of Things(IoT).To save cost and reduce power consumption,the system needs terminals to catch the characteristics of low power consumption and light control.The regular random access(RA)protocols may generate large amounts of collisions,which degrade the system throughout severally.The near-far effect and power control technologies are not applicable in capture effect to obtain power difference,resulting in the collisions that cannot be separated.In fact,the optimal design at the receiving end can also realize the condition of packet power domain separation,but there are few relevant researches.In this paper,an auxiliary beamforming scheme is proposed for power domain signal separation.It adds an auxiliary reception beam based on the conventional beam,utilizing the correlation of packets in time-frequency domain between the main and auxiliary beam to complete signal separation.The roll-off belt of auxiliary beam is used to create the carrier-to-noise ratio(CNR)difference.This paper uses the genetic algorithm to optimize the auxiliary beam direction.Simulation results show that the proposed scheme outperforms slotted ALOHA(SA)in terms of system throughput per-formance and without bringing terminals additional control burden. 展开更多
关键词 beamforming non-orthogonal multiple access random access satellite Internet of Things
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Internet of Satellites(IoS)for Intelligent Satellite Cluster:Applications,Methods,and Challenges 认领 引用 被引量：1
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作者 Guangteng Fan Peng Wu +7 位作者 Mengqi Yang Jian Wang Dechao Ran Jincheng Dai Yimeng Zhang Lu Cao Wenjun Xu Ping Zhang 《Engineering》 SCIE EI CSCD 2025年第11期155-170,共16页
The integration of emerging technologies such as artificial intelligence and cloud computing is accelerating the development of intelligent and autonomous satellite systems.However,limitations in onboard sensing,compu... The integration of emerging technologies such as artificial intelligence and cloud computing is accelerating the development of intelligent and autonomous satellite systems.However,limitations in onboard sensing,computing,storage,and energy resources continue to constrain the intelligent functionalities of individual satellites.Currently,most studies focus on either satellite intelligence or satellite networking,while systematic studies on their integration remain scarce.To address this gap,this paper introduces the concept of an intelligent satellite cluster system,which leverages satellite networks to enable collaborative intelligence among satellites,thereby enhancing the overall system intelligence.After summarizing the typical use cases of the intelligent satellite cluster system,we analyze the corresponding demands on network capabilities.Based on these demands,we propose the concept of the Internet of satellites(IoS)tailored to support the intelligent satellite cluster system.Specifically,we design both the logical and physical architectures of IoS and elaborate on its key enabling technologies.Finally,we present the research progress and outcomes achieved by our team on these core technologies,and discuss the challenges that remain.This paper aims to build consensus around intelligent and connected satellite technologies,promote innovation and standardization,and enhance the intelligent service capabilities of future large-scale satellite systems. 展开更多
关键词 Intelligent satellite cluster Internet of satellites(IoS) Space edge computing Satellite semantic communication
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Theory and Key Technologies in Space Internet Networking 认领 引用 被引量：1
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作者 Jiangzhou Wang Jiandong Li Di Zhou 《Engineering》 SCIE EI CSCD 2025年第11期1-2,共2页
The rapid evolution of satellite constellation projects(e.g.,SpaceX)and the standardization of 3rd Generation Partnership Project(3GPP)non-terrestrial networks(NTNs)have positioned satellite Internet networking(SIN)as... The rapid evolution of satellite constellation projects(e.g.,SpaceX)and the standardization of 3rd Generation Partnership Project(3GPP)non-terrestrial networks(NTNs)have positioned satellite Internet networking(SIN)as a cornerstone of future communication systems.The demand for ubiquitous connectivity,resilient infrastructures,and intelligent network services has never been greater,driven by applications ranging from global broadband access to emergency response and space-air-ground integration. 展开更多
关键词 emergency response rd generation partnership project gpp non terrestrial communication systemsthe global broadband access intelligent network services satellite internet networking sin satellite constellation projects egspacex space internet networking
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Non-Orthogonal Multi-Carrier Transmission for Internet via Satellite 认领 引用 被引量：4
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作者 Yang Yang Lidong Zhu 《China Communications》 SCIE CSCD 2017年第3期31-42,共12页
As the important complementary to terrestrial mobile communications, Internet via satellite can extend the coverage of communication and improve the continuity of data services. To build a space-terrestrial integrated... As the important complementary to terrestrial mobile communications, Internet via satellite can extend the coverage of communication and improve the continuity of data services. To build a space-terrestrial integrated communication system is the inevitable trend in the future. Taking into account combination of 5th generation(5G) terrestrial mobile communication system and satellite communication system, it is necessary to evaluate the promising 5G air interface waveform which can be adopted by satellite. In this paper, several non-orthogonal multi-carrier transmission schemes are evaluated and generalized frequency division multiplexing(GFDM) is advised as potential scheme of space-terrestrial integrated communication system. After the overview of GFDM, the implementation of GFDM transceiver is discussed respectively in time-domain and in frequency-domain. By deriving and comparing implementation complexity, GFDM modulation in time-domain is more suitable for satellite communication system. Then the properties of demodulation algorithms are specified. Based on designed pilot subcarriers, a new improved receiving algorithm is proposed in the end of the paper. The improved algorithm solves the problem of inter subcarriers interference(ICI) in matched filtering(MF) receiver and improves the re-ceiving symbol error rate(SER) obviously. The simulation and analysis prove that the proposed algorithm is effective. 展开更多
关键词 Internet via satellite air interface non-orthogonal modulation interference cancellation
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From Earth to Space:A First Deployment of 5G Core Network on Satellite 认领 引用 被引量：10
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作者 Ruolin Xing Xiao Ma +2 位作者 Ao Zhou Schahram Dustdar Shangguang Wang 《China Communications》 SCIE CSCD 2023年第4期315-325,共11页
Recent developments in the aerospace industry have led to a dramatic reduction in the manufacturing and launch costs of low Earth orbit satellites.The new trend enables the paradigm shift of satelliteterrestrial integ... Recent developments in the aerospace industry have led to a dramatic reduction in the manufacturing and launch costs of low Earth orbit satellites.The new trend enables the paradigm shift of satelliteterrestrial integrated networks with global coverage.In particular,the integration of 5G communication systems and satellites has the potential to restructure nextgeneration mobile networks.By leveraging the network function virtualization and network slicing,the satellite 5G core networks will facilitate the coordination and management of network functions in satellite-terrestrial integrated networks.We are the first to deploy a 5G core network on a real-world satellite to investigate its feasibility.We conducted experiments to validate the satellite 5G core network functions.The validated procedures include registration and session setup procedures.The results show that the satellite 5G core network can function normally and generate correct signaling. 展开更多
关键词 5G core network satellite communications satellite Internet
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Design and performance evaluation of a novel ranging signal based on an LEO satellite communication constellation 认领 引用 被引量：1
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作者 Jingfang Su Jia Su +2 位作者 Qingwu Yi Cailun Wu Weimin Hou 《Geo-Spatial Information Science》 SCIE EI CSCD 2023年第1期107-124,共18页
Driven by improvements in satellite internet and Low Earth Orbit(LEO)navigation augmenta-tion,the integration of communication and navigation has become increasingly common,and further improving navigation capabilitie... Driven by improvements in satellite internet and Low Earth Orbit(LEO)navigation augmenta-tion,the integration of communication and navigation has become increasingly common,and further improving navigation capabilities based on communication constellations has become a significant challenge.In the context of the existing Orthogonal Frequency Division Multiplexing(OFDM)communication systems,this paper proposes a new ranging signal design method based on an LEO satellite communication constellation.The LEO Satellite Communication Constellation Block-type Pilot(LSCC-BPR)signal is superimposed on the com-munication signal in a block-type form and occupies some of the subcarriers of the OFDM signal for transmission,thus ensuring the continuity of the ranging pilot signal in the time and frequency domains.Joint estimation in the time and frequency domains is performed to obtain the relevant distance value,and the ranging accuracy and communication resource utilization rate are determined.To characterize the ranging performance,the Root Mean Square Error(RMSE)is selected as an evaluation criterion.Simulations show that when the number of pilots is 2048 and the Signal-to-Noise Ratio(SNR)is 0 dB,the ranging accuracy can reach 0.8 m,and the pilot occupies only 50%of the communication subcarriers,thus improving the utilization of communication resources and meeting the public demand for communication and location services. 展开更多
关键词 Integration of communication and navigation LEO communication constellation ranging LEO navigation augmentation satellite internet
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Steady-State Performance Evaluation of Linux TCPs versus TCP Wave over Leaky Satellite Links 认领 引用 被引量：1
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作者 Ahmed Abdelsalam Cesare Roseti Francesco Zampognaro 《China Communications》 SCIE CSCD 2017年第3期17-30,共14页
Internet access is becoming even more heterogeneous, including different wireless backhauling links, with Ka-band satellites as a possible alternative. Since communication path is unknown a priori, adoption of PEP sol... Internet access is becoming even more heterogeneous, including different wireless backhauling links, with Ka-band satellites as a possible alternative. Since communication path is unknown a priori, adoption of PEP solutions to optimize TCP performance over satellite is discouraged to allow dynamic network reconfigurations. To opposite, an endto-end TCP performance evaluation on such a challenging scenario, with possible large latency and transmission losses, is herein considered of paramount importance. Several TCP variants exist to tackle different aspects of communication networks. In Linux, the different TCP congestion control schemes differ from the theoretical formulations and RFC specifications, introducing a varying set of optimizations and options. This aspect makes difficult to identify a standardeference TCP version for the proposed scenario, while testing with the real protocol stacks is deemed necessary to obtain consistent results. In addition, an innovative end-to-end TCP, namely TCP Wave, is introduced to replace the traditional window-based transmission with a burst-based strategy, representing a valid alternative to Linux TCP. To offer a fair, realistic and comprehensive evaluation, we configured a simulation setup where different Linux TCPs can be run within ns-3 network simulator and compared with TCP Wave. 展开更多
关键词 TCP satellite internet leaky channels Linux ns-3
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Adaptability Analysis of IP Routing Protocol in Broadband LEO Constellation Systems 认领 引用 被引量：3
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作者 SUN Chenhua YIN Bo +2 位作者 LI Xudong TIAN Xing PANG Ce 《ZTE Communications》 2020年第4期34-44,共11页
With the inclusion of satellite Internet as the information infrastructure in China's "new infrastructure" category,relevant domestic industries and scientific research institutes have successively carri... With the inclusion of satellite Internet as the information infrastructure in China's "new infrastructure" category,relevant domestic industries and scientific research institutes have successively carried out the design of broadband low earth orbit(LEO) constellation systems and key technical research.As the core technology for the satellite-to-ground network communications of a broadband LEO constellation system,routing technology is extremely important for the efficient and reliable transmission of various service data.Focusing on the two important broadband LEO constellation systems in China,in-depth analysis and simulation of the high dynamics of the satellite-to-ground satellites are conducted in this paper to obtain more accurate network topology changes and characteristics;then the adaptability of the ground standard IP routing protocol to the broadband LEO constellation system is analyzed,and an LEO constellation simulation scenario is built with the Opnet software.The simulation results of the convergence performance of the standard IP routing protocol are produced.The results show that the IP protocol does not perform well for LEO satellite constellation networks.Based on the studies,some solutions are proposed to take full advantages of the characteristics of LEO satellite systems.These can also provide a reference for the choice of intersatellite routing architecture and protocol technology for broadband LEO constellation in the future development. 展开更多
关键词 satellite Internet IP routing protocol high dynamic networking
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An Active Multi-Beam Antenna Design Method and Its Application for the Future 6G Satellite Network 认领 引用 被引量：5
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作者 Xiao Tao Wei Ding +3 位作者 Shuo Wang Xingang Zhang Wanzhao Cui Qinglong Cui 《Space(Science & Technology)》 EI 2024年第1期302-314,共13页
The active multi-beam antenna can be widely used in the 6G integrated satellite network project,the national satellite Internet project,and other major satellite projects.It determines the key performance indicators o... The active multi-beam antenna can be widely used in the 6G integrated satellite network project,the national satellite Internet project,and other major satellite projects.It determines the key performance indicators of the satellite such as the service coverage area and the communication capacity of all the beams in the forward link and the return link.The active multi-beam antenna is the core technology of satellite payload and has been developed rapidly in recent years.Based on the antenna performance requirements such as the number of giant-scale beams,super-large coverage area,high gain,and high carrier-to-interference ratio(C/I),this paper proposes a new active multi-beam antenna design method,which integrates the multi-objective coordination and multi-feed amplitude and phase weighted optimization algorithms.A balanced optimal solution that meets the performance requirements can be obtained by constraining each other with different objective functions.In the optimization process,the surrogate model of convolutional autoencoder based on artificial intelligence technology is proposed for multi-objective optimization solution,which efficiently completes the search of optimal beam excitation coefficients.This paper takes the demand for very-high-throughput communication satellites serving the Asia-Pacific region as an example and applies the design method to the multi-beam antenna design of the satellite.The simulation verification of the antenna is completed,achieving good performance of 976 beams.All results meet the performance requirements,supporting the implementation of 1 Tbps communication capacity for the entire satellite,and verifying the correctness of the design method. 展开更多
关键词 service coverage area key performance indicators active multi beam antenna national satellite internet project satellite payload g integrated satellite network G satellite network multi feed amplitude phase weighted optimization
CHINA IN A NEW ERA 认领 引用
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作者 无 《Qiu Shi》 2025年第4期F0002-F0002,共1页
A Long March-8A carrier rocket carrying a group of low Earth orbit satellites blasts off from the Hainan commercial spacecraft launch site,Hainan Province,July 30,2025.This was the sixth satellite group launched as pa... A Long March-8A carrier rocket carrying a group of low Earth orbit satellites blasts off from the Hainan commercial spacecraft launch site,Hainan Province,July 30,2025.This was the sixth satellite group launched as part of a project to deploy a satelliteinternetconstellation. 展开更多
关键词 Long March low earth orbit satellites China carrier rocket satellite internet constellation Hainan commercial spacecraft launch site deploy satelliteinternetconstellation low Earth orbit satellites
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