• Cluster Based MIMO Radio Channel Modeling 

      Li, Xin (Doctoral theses at NTNU;2020:379, Doctoral thesis, 2020)
      Modeling of wireless channels is perhaps the most complex task in implementing a wireless communication system because wireless channels change over time, vary with frequency and space. That is, the transmit signal with ...
    • Design of a practical and compact mm-wave MIMO system with optimized capacity and phased arrays 

      Cella, Tommaso; Orten, Pål; Ekman, Torbjörn (Journal article; Peer reviewed, 2014)
      In this paper we evaluate the feasibility of short range outdoor mm-wave MIMO links in the 70 GHz portion of the E-band (71–76 GHz). We use phased arrays in order to strongly reduce the impact of the multipath components, ...
    • 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 ...
    • Increasing sum-rate in large-scale cognitive radio networks by centralized power and spectrum allocation 

      Vijayandran, Luxmiram; Byun, Sang-Soon; Øien, Geir Egil; Ekman, Torbjörn (Journal article; Peer reviewed, 2012)
      We revisit the widely investigated problem of maximizing the centralized sum-rate capacity in a cognitive radio network. We consider an interference-limited multi-user multi-channel environment, with a transmit sum-power ...