1. Rate balancing in the vector BC with erroneous CSI at the receivers
- Author
-
Michael Joham, Wolfgang Utschick, Andreas Grundinger, Adriano Pastore, Javier R. Fonollosa, Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, and Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions
- Subjects
Theoretical computer science ,Radiofreqüència ,Iterative method ,Computer science ,Gaussian ,Information science ,Gaussian processes ,Duality (optimization) ,Upper and lower bounds ,Spurious signal noise ,symbols.namesake ,Quality of service ,Radio frequency ,Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Radiodifusió per ràdio [Àrees temàtiques de la UPC] ,Computer Science::Information Theory ,Radio--Receivers and reception ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Mutual information ,Vectors ,Ràdio -- Receptors i recepció ,Transmitter power output ,Channel state information ,Signal interference ,symbols ,Algorithm ,Algorithms - Abstract
For the vector broadcast channel (BC), the case of erroneous channel state information (CSI) at the receiver is considered. Employing a well established lower bound for the mutual information with Gaussian signaling, a rate balancing problem is formulated where the rates of the different users are maximized under a transmit power constraint, but the rates of the different users have fixed ratios. A duality w.r.t. the signal-to-interference-and-noise ratio (SINR) between the vector BC with erroneous receiver CSI and an appropriately constructed vector multiple access channel (MAC) is established. Based on the observation that an interference function can be defined in the dual vector MAC that is standard, an iterative algorithm can be found for an appropriately formulated quality-of-service (QoS) optimization that is used for solving the balancing problem.
- Published
- 2013
- Full Text
- View/download PDF