| Citation: | ZENG Qi, ZHONG Jun, LIU Xing. Sparse Code Multiple Access Communication Networks Based on Multi-Level Quality-of-Service Frequency-hopping for Heterogeneous Multi-tier Multi-cell[J]. Journal of Electronics & Information Technology, 2022, 44(9): 2977-2985. doi: 10.11999/JEIT211364 | 
 
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