• Alternating Minimization for Wideband Multiuser IRS-Aided MIMO Systems Under Imperfect CSI 

      Pérez-Adán, Darian; Joham, Michael; Fresnedo, Óscar; González-Coma, José P.; Castedo, Luis; Utschick, Wolfgang (Institute of Electrical and Electronics Engineers, 2023-11-28)
      [Abstract]: This work focuses on wideband intelligent reflecting surface (IRS)-aided multiuser MIMO systems. One of the major challenges of this scenario is the joint design of the frequency-dependent base station (BS) ...
    • QoS constrained power minimization in the MISO broadcast channel with imperfect CSI 

      González-Coma, José P.; Joham, Michael; Castro-Castro, Paula-María; Castedo, Luis (Elsevier, 2017-02)
      [Abstract]: In this paper we consider the design of linear precoders and receivers in a Multiple-Input Single-Output (MISO) Broadcast Channel (BC). We aim to minimize the transmit power while meeting a set of per-user ...
    • QoS constrained power minimization in the multiple stream MIMO broadcast channel 

      González-Coma, José P.; Joham, Michael; Castro-Castro, Paula-María; Castedo, Luis (Elsevier, 2018-02)
      [Abstract]: This work addresses the design of optimal linear transmit filters for the Multiple Input-Multiple Output (MIMO) Broadcast Channel (BC) when several spatial streams are allocated to each user. We further consider ...
    • Robust Precoding with Bayesian Error Modeling for Limited Feedback MU-MISO Systems 

      Joham, Michael; Castro-Castro, Paula-María; Castedo, Luis; Wolfgang, Utschick (IEEE, 2010)
      [Abstract] We consider the robust precoder design for multiuser multiple-input single-output (MU-MISO) systems where the channel state information (CSI) is fed back from the single antenna receivers to the centralized ...
    • Robust Precoding with Limited Feedback Design based on Precoding MSE for MU-MISO Systems 

      Joham, Michael; Castro-Castro, Paula-María; Utschick, Wolfgang; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2012-06)
      [Abstract] For the separation of the signals in the vector broadcast channel (BC), some information about the channel state is necessary at the transmitter. In many cases, this channel state information (CSI) must be fed ...