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Feedback design for multi-user MIMO systems

: Jungnickel, V.; Thiele, L.; Wirth, T.; Schellmann, M.; Haustein, T.; Venkatkumar, V.

Rohling, H. ; TU Hamburg-Harburg, Institut für Nachrichtentechnik:
13th International OFDM-Workshop, InOWo'08. Proceedings : August 27th - 28th, 2008 at the Hotel Atlantic, Hamburg, Germany
Hamburg, 2008
5 S.
International OFDM-Workshop (InOWo) <13, 2008, Hamburg>
Fraunhofer HHI ()
Algorithmus; Datendurchsatz; Frequenzmultiplex; Leistungsmessung; Mehrbenutzerbetrieb; Messergebnis; Modellsimulation; Rückkopplung; Signalquantisierung; SNR=Signal-Rausch-Verhältnis; Störabstand; zellulares Funksystem; Digitalmodulation

The authors consider feedback design for the integration of multi-user multiple input multiple output (MIMO) in cellular mobile radio systems. Feedback is given by the mobile terminals, which report beam indices referring to a set of fixed pre-coding beams and corresponding signal to signal to interference and noise ratio (SINR) for different supported spatial transmission modes. The SINR feedback is quantized with a different number of bits, and the performance in terms of throughput achieved with a score-based scheduler is evaluated. Test scenarios from multi-cell simulations as well as single-sector measurements are considered. Results show that cell-edge users benefit the most from an increased amount of feedback bits