Extremely large-scale array (XL-array) has emerged as a promising technology to improve
the spectrum efficiency and spatial resolution of future wireless systems. However, the huge …

In this letter, we study efficient near-field beam training design for the extremely large-scale
array (XL-array) communication systems. Compared with the conventional far-field beam …

Prior works on near-field beam training have mostly assumed dedicated polar-domain
codebook and on-grid range estimation, which, however, may suffer long training overhead …

Extremely large-scale arrays (XL-arrays) have emerged as a promising technology to
achieve super-high spectral efficiency and spatial resolution in future wireless systems. The …

Massive multiple-input multiple-output (MIMO) for 5G is evolving into the extremely large-
scale antenna array (ELAA) to increase the spectrum efficiency by orders of magnitude for …

A near-field wideband communication system is studied, wherein a base station (BS)
employs an extremely large-scale antenna array (ELAA) to serve multiple users situated …

Extremely large-scale reconfigurable intelligent surface (XL-RIS) has recently been
proposed and is recognized as a promising technology that can further enhance the …

Extremely large-scale multiple-input multiple-output (XL-MIMO) is considered as a key
technology for future wireless communications. For near-field beam training in XL-MIMO, the …

Spatial division multiple access (SDMA) is essential to improve the spectrum efficiency for
multi-user multiple-input multiple-output (MIMO) communications. The classical SDMA for …

As the line-of-sight propagation component is dominant in Terahertz (THz) channels, beam
training is regarded as an efficient beamforming strategy for THz communications. In the …