| Due to the advantages of low loss and wide coverage,low-orbit satellites can be perfectly combined with ground 5G mobile communication networks,overcome the limitations of terrain and geomorphology,provide users with ubiquitous access services,realize the integrated network of space,ground and sea,and meet the access needs of various scenarios.Therefore,the complementary integration of satellite communication and 5G ground communication is the development trend of future mobile communication system.The complex satellite-ground transmission link channel has high-speed time-variability,which will produce multipath effect on the signal,cause signal fading,and lead to a significant increase in bit error rate,so channel estimation plays an important role in the satellite-ground fusion link.This thesis first studies the frame structure under the Ka band in the satellite-ground transmission link,and builds the channel model based on the channel model generation principle of ITU and 3GPP.Secondly,the top-level design scheme of the receiving end is determined,and a multi-module acceleration scheme is proposed for the time constraint of real-time processing of the receiving end system,and the channel estimation design scheme of the receiving end is determined,including the selection of channel estimation algorithm,the pattern,power,insertion density and law of the pilot.Analyze the changes in data volume after the signal passes through various modules at the receiving end,as well as the hardware resource consumption of the proposed channel estimation design scheme and the overall architecture scheme of the receiving end.Finally,the hardware platform is built,and an overall test scheme is designed based on the data processing process of the hardware platform.Simulation and test verification are conducted based on the software and hardware platform.The results show that the scheme can support stable communication in wireless channel simulation simulators and actual engineering environments. |
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