| Citation: | Bo XI, Tao HONG, Gengxin ZHANG. Research on the Collaborative Beamforming Technique Based on the Node Selection for Satellite Internet of Things[J]. Journal of Electronics & Information Technology, 2020, 42(12): 2882-2890. doi: 10.11999/JEIT190707
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The transmission performance of nodes in the satellite Internet of Things(IoT) is limited due to the long-distance transmission and the power-constrained terminal. A collaborative beamforming technique is proposed based on the node selection algorithm to improve the transmission performance of nodes. An average far-field beampattern for collaborative beamforming is derived by considering the location information error in practical scenario. Furthermore, the difference between average beampattern and instantaneous beampattern is analyzed by the system parameters. On this basis, a node selection algorithm is proposed based on region grouping not only to meet the requirement of satellite link, but also to suppress the sidelobe. Simulation results show better performance of the proposed algorithm compared with the traditional node selection algorithms in the actural error model.
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