Robust Beamforming Based on Graph Attention Networks for IRS-Assisted Satellite IoT Communications.
Robust Beamforming Based on Graph Attention Networks for IRS-Assisted Satellite IoT Communications.
复制标题
基于图注意网络的鲁棒波束成形,用于 IRS 辅助卫星物联网通信
DOI:
10.3390/e24030326
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发表时间:
2022-02-24
期刊:
影响因子:
--
通讯作者:
Fan J
中科院分区:
文献类型:
--
作者:
Cao H;Zhu W;Feng W;Fan J
Satellite communication is expected to play a vital role in realizing Internet of Remote Things (IoRT) applications. This article considers an intelligent reflecting surface (IRS)-assisted downlink low Earth orbit (LEO) satellite communication network, where IRS provides additional reflective links to enhance the intended signal power. We aim to maximize the sum-rate of all the terrestrial users by jointly optimizing the satellite’s precoding matrix and IRS’s phase shifts. However, it is difficult to directly acquire the instantaneous channel state information (CSI) and optimal phase shifts of IRS due to the high mobility of LEO and the passive nature of reflective elements. Moreover, most conventional solution algorithms suffer from high computational complexity and are not applicable to these dynamic scenarios. A robust beamforming design based on graph attention networks (RBF-GAT) is proposed to establish a direct mapping from the received pilots and dynamic network topology to the satellite and IRS’s beamforming, which is trained offline using the unsupervised learning approach. The simulation results corroborate that the proposed RBF-GAT approach can achieve more than 95% of the performance provided by the upper bound with low complexity.
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DOI:
10.3390/e23111470
发表时间:
2021-11-07
期刊:
Entropy (Basel, Switzerland)
影响因子:
--
作者:
Luan Z;Jia H;Wang P;Jia R;Chen B
通讯作者:
Chen B
影响因子:
6.8
作者:
Ge, Yimeng;Fan, Jiancun
通讯作者:
Fan, Jiancun
影响因子:
10.4
作者:
Abdi, A;Lau, WC;Kaveh, M
通讯作者:
Kaveh, M
影响因子:
8.1
作者:
Zhang, Zhengquan;Xiao, Yue;Fan, Pingzhi
通讯作者:
Fan, Pingzhi
影响因子:
10.4
作者:
Arnau, Jesus;Christopoulos, Dimitrios;Ottersten, Bjoern
通讯作者:
Ottersten, Bjoern