UE Position Sensing in Non-LoS Propagation for U6G Wideband XL-MIMO Systems

In order to enhance the capacity of sixth generation wireless systems, the extremely large-scale multiple-input multiple-output (XL-MIMO) and upper-6 GHz (U6G) propagation are regarded promising technologies. It is imperative to recognize that the unique characteristics of U6G wideband XL-MIMO systems, including hybrid-field and beam squint effects, engender numerous challenges in channel estimation. However, it should be noted that these characteristics can also facilitate user equipment (UE) locating in non-line-of-sight (NLoS) scenarios. Consequently, a multiple-scatterer joint sensing algorithm is proposed. The near-field components are extracted from the hybrid-field channel firstly, and subsequently the spatial parameters are detected in a decoupled manner. The UE position is then effectively located based on the spatial geometry relation between the UE and multiple scatterers. The numerical results demonstrate the efficacy of the proposed UE localization algorithm in NLoS scenarios, while entailing reduced complexity.