Abstract: Extremely large-scale antenna array (ELAA) technologies consisting of ultra-massive multiple-input-multiple-output (UM-MIMO) or reconfigurable intelligent surfaces (RISs), are emerging to ...

It must have been sobering to hear the German chancellor say that 'appeasing terrorists' isn't the answer You can save this article by registering for free here. Or sign-in if you have an account. In ...

Abstract: This letter addresses the downlink near-field multi-user communication scenario and introduces a modular array (MA) based hybrid beamforming architecture, establishing the first system model ...