Special Issue: Transmission Technology of Space-Integrated-Ground Information Network

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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Research on Optical/Electric Hybrid Switching Technique for Space-Integrated-Ground Information Network Shanghong ZHAO, Cong PENG, Yongjun LI, Hai LI Space-Integrated-Ground Information Networks    2021, 2 (2): 46-52.   DOI: 10.11959/j.issn.2096-8930.2021019 Abstract （253）   HTML （41）    PDF（pc） （1466KB）（355）       Knowledge map    Save Space-integrated-ground information network will face the challenges of heterogeneous links, multi-granularity of information and limited resources in the process of networking.The problems can be solved by data switching design.The architecture of space-integrated-ground information network was described, and the present situation of multi-granularity service hybrid switching was analyzed.Based on this, the idea of hybrid optical/RF/packet switching was proposed, i.e., hybrid switching structure design, optical switching based on four-wave mixing eff ect, broadband confi gurable RF channelized switching, packet high-speed switching based on software radio idea, laser/RF heterogeneous link optical domain aggregation and grooming and enhanced general multi-protocol label switching design. Table and Figures | Reference | Related Articles | Metrics Select Effect of Optical Signal Beam Shift on the Performance of Satellite Chaos Laser Safety Communication System under Space-Integrated-Ground Information Network Mi LI, Qiang CHEN, Cheng ZENG, Xue WANG, Yisi WANG, Xiangfei CHEN Space-Integrated-Ground Information Networks    2021, 2 (2): 53-61.   DOI: 10.11959/j.issn.2096-8930.2021020 Abstract （198）   HTML （12）    PDF（pc） （1619KB）（146）       Knowledge map    Save The eff ect of beam center shift on the performance of satellite chaos laser safety communication system in spaceintegrated-ground information network was studied, the bit error rate (BER) formulae with external and internal mismatch caused by beam center shift was conducted.Based on the BER formulae, the eff ect of beam center shift on external and internal mismatch and system performance was analyzed.The results show that beam wander will further increase external and internal mismatch based on pointing error then aff ect system performance.When pointing error is relatively small, optimizing beam wander will improve system performance more, and when pointing error is relatively large, optimizing internal mismatch will improve system performance more.The research results of this paper have important reference signifi cance for the actual engineering design of satellite chaos laser safety communication system, and lay the foundation for the promotion of terrestrial high-speed chaos laser safety technology to the fi eld of space-integrated-ground. Table and Figures | Reference | Related Articles | Metrics Select Research on Performance of Fiber-Based Multiple Apertures Receiver System with PPM Modulation Kangning LI, Xu FENG, Jianwen GAO, Jing Ma Space-Integrated-Ground Information Networks    2021, 2 (2): 62-68.   DOI: 10.11959/j.issn.2096-8930.2021021 Abstract （153）   HTML （14）    PDF（pc） （1407KB）（370）       Knowledge map    Save The performance of fi ber-based FSO with multiple apertures receiver system was studied for pulse position modulation (PPM) .Expressions of PPM modulated signal-to-noise ratio (SNR) and bit-error rate (BER) for fi ber-based FSO multiple apertures receiver system were presented based on the probability density function of Gamma-Gamma intencity distribution and non–central chisquare fi ber coupling effi ciency distribution under atmospheric infl uence.Selection combining (SC), equal gain combining (EGC) and maximum ratio combining (MRC) were considered to be three signal combining methods for multiple apertures receiver system.The BER performance of 4PPM modulted SC, EGC and MRC fi ber-based multiple apertures receiver system and single aperture receiver system with the same total aperture area were comparative analyzed by Monte Carlo simulation.The BER performance of fi ber-based multiple apertures receiver systems in 4PPM and 8PPM modulation modes were directly compared for diff erent combining methods. Table and Figures | Reference | Related Articles | Metrics Select Research on Dynamic Equalization of Optical Power for Satellite-Ground Laser Communication Yuefeng CAI, Haifeng LIU, Bo LIU, Wei LIN Space-Integrated-Ground Information Networks    2021, 2 (2): 69-74.   DOI: 10.11959/j.issn.2096-8930.2021022 Abstract （183）   HTML （11）    PDF（pc） （1167KB）（227）       Knowledge map    Save Aiming at the problem of light intensity scintillation caused by atmospheric turbulence at the receiver of satellite-ground laser communication will aff ect the communication quality, an optical power balance system based on gain competition was studied.The experiment verifi ed that the received power fl uctuation increased the communication bit error rate.The static output curve of the equalization system under gain competition was studied and the equalization performance of the dynamic time domain signal was tested.The experimental results showed that the system could compress the power fl uctuation range of the dynamic signal to 4 dB. 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