• Effective Channel Hardening in an Indoor Multiband Scenario 

      Ghiaasi, Golsa; Abraham, Jens; Eide, Egil; Ekman, Torbjörn (Journal article; Peer reviewed, 2019)
      We evaluate channel hardening for a large scale antenna system by means of indoor channel measurements over four frequency bands, 1.472 GHz, 2.6 GHz, 3.82 GHz and 4.16 GHz. NTNU’s Reconfgurable Radio Network Platform has ...
    • Fast and Accurate Simulation Technique for Large Irregular Arrays 

      Bui Van, Ha; Abraham, Jens; Arts, Michel; Gueuning, Quentin; Raucy, Christopher; González-Ovejero, David; de Lera Acedo, Eloy; Craeye, Christophe (Journal article; Peer reviewed, 2018)
      A fast full-wave simulation technique is presented for the analysis of large irregular planar arrays of identical 3-D metallic antennas. The solution method relies on the macro basis function (MBF) approach and an interpolatory ...
    • Methods for Finite Massive MIMO Analysis 

      Abraham, Jens (Doctoral thesis, 2022)
      Massive MIMO is a core technology for 5G cellular networks, that matured from a concept to commercial implementations over the last decade. It uses large-scale antenna systems to provide unprecedented access to the spatial ...
    • Statistics of the Effective Massive MIMO Channel in Correlated Rician Fading 

      Abraham, Jens; Ramírez-Espinosa, Pablo; Ekman, Torbjörn (Peer reviewed; Journal article, 2022)
      Massive multiple-input multiple-output base stations use multiple spatial diversity branches, which are often assumed to be uncorrelated in theoretical work. Correlated branches are seldom considered since they are ...