Information Transmission Technology for Satellite-Terrestrial Integration

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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Space-Integrated-Ground Information Networks    2022, 3 (4): 65-66.   DOI: 10.11959/j.issn.2096-8930.2022044-1 Abstract （94）   HTML （10）    PDF（pc） （638KB）（207）       Knowledge map    Save Reference | Related Articles | Metrics Select Detection of 3D Spatial-Temporal Spectrum Opportunity in Satellite-Terrestrial Integrated Network Ning YANG, Daoxing GUO Space-Integrated-Ground Information Networks    2022, 3 (4): 67-74.   DOI: 10.11959/j.issn.2096-8930.2022044 Abstract （109）   HTML （16）    PDF（pc） （1522KB）（144）       Knowledge map    Save The detection of 3D spectrum opportunities in the downlink sharing scenario in satellite-terrestrial integrated networks was investigated.First, defined the 3D space-time spectrum opportunities in the satellite-terrestrial integrated networks, and further divided the opportunities into three areas in the spatial domain: the communication area of primary user, the communication protection belt, and the free access area.Then, based on the proposed 3D opportunity model, derived the closed expressions of the detection and false alarm probability at the user-level and the network-level, respectively.In order to further utilized the spatial spectrum opportunity, a power control scheme of the cognitive user was determined through 3D spectrum sensing, i.e., interference constraint (IC).The simulation results demonstrated that the proposed power control scheme could realized the detection of 3D spectrum opportunity. Table and Figures | Reference | Related Articles | Metrics Select Beamforming for Non-Orthogonal Multicast and Unicast Transmissions Based on Rate Splitting in Satellite-Terrestrial Integrated Network Bensi ZHANG, Deyi PENG, Yun LI Space-Integrated-Ground Information Networks    2022, 3 (4): 75-82.   DOI: 10.11959/j.issn.2096-8930.2022045 Abstract （130）   HTML （12）    PDF（pc） （1542KB）（109）       Knowledge map    Save A non-orthogonal multicast and unicast transmission scenarios in the satellite-terrestrial integrated networks (STIN was considered), and a system model of joint multi-group multicast and unicast downlink transmitting was constructed.In order to improved the spectral effi ciency of STIN, a beamforming scheme that non-orthogonal transmission based on rate splitting was proposed, where a max-min fair (MMF) beamforming design problem was established to optimized transmit beamforming vector of base station and satellite respectively.And then, considered non-convex constraint caused by variable coupling in the problem, an iterative algorithm based on successive convex approximation to solved the optimization problem was proposed.Simulation results showed that our proposed scheme could improved eff ectively the MMF transmitting rate of the STIN in contrast with the traditional non-rate splitting and layer division multiplexing schemes. Table and Figures | Reference | Related Articles | Metrics Select Multi-Users Dynamic Bandwidth Allocation Technology of SDTN Jianxiang CHU, Yin HUANG, Chong WANG, Yunze CAO Space-Integrated-Ground Information Networks    2022, 3 (4): 83-91.   DOI: 10.11959/j.issn.2096-8930.2022046 Abstract （149）   HTML （21）    PDF（pc） （1321KB）（443）       Knowledge map    Save The TT＆amp;C and data transmission of spacecraft are divided into two methods: space-based and ground-based.Among them, space-based method has the advantages of global coverage, access at any time, and real-time information return, and have a wide range of application prospects.But it also puts forward certain requirements for the dynamic bandwidth allocation of its multi-spacecraft.Based on the studied of medium-orbit TT＆amp;C, data transmission constellation network architecture and multiple access protocols, a dynamic bandwidth allocation algorithm for on-doard multi-beam, multi-spacecraft users, and multi-task priorities for data transmission tasks was proposed.It was very suitable for the on-demand and real-time resource allocation of data transmission requests of multiple spacecraft in the mid-orbit constellation, and could be used as a multiple access protocol model for space-based measurement and control and data transmission access networks. Table and Figures | Reference | Related Articles | Metrics Select Research on HARQ Technology in Low-Orbit Satellite Communication Network Runxin ZHANG, Shun ZHANG, Jianpeng MA, Jing ZHANG, Yunfei WU Space-Integrated-Ground Information Networks    2022, 3 (4): 92-100.   DOI: 10.11959/j.issn.2096-8930.2022047 Abstract （171）   HTML （28）    PDF（pc） （2472KB）（224）       Knowledge map    Save How to extend the HARQ technique to made it suitabled for LEO satellite communication network was explored.First the traditional HARQ technology was expounded.Based on this, the HARQ scheme based on low density parity check code (LDPC) and the HARQ scheme based on message group check code (BCC) were studied respectively, the performance of the schemes was analyzed through simulation.Finally, suitable feedback schemes were analyzed for the retransmission units in the HARQ retransmission mechanism, which provided some reference for the research of HARQ technology in LEO satellite communication networks. Table and Figures | Reference | Related Articles | Metrics Select Overview of OTFS Based Channel Estimation Techniques in LEO Satellite Communication Xinjie ZHAO, Ziwei LIU, Gengxin ZHANG Space-Integrated-Ground Information Networks    2022, 3 (4): 101-106.   DOI: 10.11959/j.issn.2096-8930.2022048 Abstract （374）   HTML （55）    PDF（pc） （1821KB）（267）       Knowledge map    Save With the development of science and technology and the continuous improvement of related technologies, low earth orbit (LEO) satellite communication has become a hot technology that countries all over the world are chasing.The advantages of orthogonal time frequency spacetechnology can well solve the signal transmission problem of broadband satellite ground link in high moving speed scenarios, which is conducive to the unifi cation of modulation waveforms between satellites and the ground, and the realization of space-based integrated communication.However, its transmission performance is aff ected by the accuracy of channel estimation, and the special modulation makes its channel estimation method diff erent from the traditional technology, so it needs to be studied.The existing mainstream OTFS channel estimation schemes are introduced, and the advantages and disadvantages of each scheme were analyzed, which laied a foundation for subsequent research. Table and Figures | Reference | Related Articles | Metrics Select Implementation Method of GEO and LEO Satellite Tracking Compatible Flat-Plate Antenna Jian CHEN, Zhengqian ZHANG, Xinsheng MA, Ting CHAO, Gangtao GUO Space-Integrated-Ground Information Networks    2022, 3 (4): 107-112.   DOI: 10.11959/j.issn.2096-8930.2022049 Abstract （137）   HTML （19）    PDF（pc） （1942KB）（199）       Knowledge map    Save In order to improve the portability, disassembly and usability of the satellite communication antenna products in the fi eld, a GEO and LEO satellite tracking compatible fl at-plate antenna implementation method was proposed, the micro strip array antenna was integrated with the radio frequency channel, and the radio frequency of the antenna was fl at and integrated, combined with the high density multi-layer vertical interconnection technology, the whole machine was small in size, light in weight and low in power consumption, and the tracking control unit could satisfi ed the requirements of GEO Beacon and carrier tracking, also could satisfi ed the LEO analysis and the program guidance tracking.The antenna did not need manual assembly and disassembly, and could be used for satellite communication with onebutton deployment.high-precision tracking and stable communication could be achieved for GEO, MEO and LEO satellite. 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