A Tutorial on Near-Field XL-MIMO Communications Toward 6G

Extremely large-scale multiple-input multiple-output (XL-MIMO) is a promising technology for the sixth-generation (6G) mobile communication networks. By significantly boosting the antenna number or size to at least an order of magnitude beyond current massive MIMO systems, XL-MIMO is expected to unprecedentedly enhance the spectral efficiency and spatial resolution for wireless communication. The evolution from massive MIMO to XL-MIMO is not simply an increase in the array size, but faces new design challenges, in terms of near-field channel modeling, performance analysis, channel estimation, and practical implementation. In this article, we give a comprehensive tutorial overview on near-field XL-MIMO…

• NN
  National Natural Science Foundation of China

  Awards: 62261160576, 62331023, 62301148, 62201242, 62071114, 62331022
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20230824
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2242024RCB0006