The application of Non-Orthogonal Multiple Access(NOMA)technology into satellite-aerial-ground integrated networks can meet the requirements of ultra-high rate and massive connec-tivity for the Sixth-Generation(6G)communication systems.We consider an uplink NOMA sce-nario for such a satellite-aerial-ground integrated network where multiple users communicate with satellite under the help of an Unmanned Aerial Vehicle(UAV)as an aerial relay equipped with a phased array.Supposing that buffer-aided decode-and-forward protocol is adopted at the UAV relay,we first formulate an optimization problem to maximize Ergodic Sum Rate(ESR)of the con-sidered system subject to individual power constraint and quality-of-service constraint of each user.Then,with known imperfect channel state information of each user,we propose a joint power allo-cation and robust Beam Forming(BF)iterative algorithm to maximize ESR for the user-to-UAV link.Besides,to take the advantages of Free-Space Optical(FSO)and millimeter Wave(mmWave)communications,we present a switch-based hybrid FSO/mmWave scheme and a robust BF algo-rithm for the UAV-to-satellite link to achieve higher rate.Moreover,a closed-form ESR expression is derived.Finally,the effectiveness and correctness of the proposed solutions are verified by numer-ical simulations,and the performance evaluation results show that the proposed solutions not only achieve performance enhancement and robustness,but also outperform the orthogonal multiple access significantly.

Huaicong KONG;Min LIN;Jian ZHANG;Jian OUYANG;Jun-Bo WANG;Prabhat K.UPADHYAY

College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China;Discipline of Electrical Engineering,Indian Institute of Technology Indore,Indore 453552,India

中国航空学报（英文版）

[1]Huaicong KONG;Min LIN;Jian ZHANG;Jian OUYANG;Jun-Bo WANG;Prabhat K.UPADHYAY-.Ergodic sum rate for uplink NOMA transmission in satellite-aerial-ground integrated networks)[J].中国航空学报（英文版）,2022(09):58-70

Ergodic,Supposing

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