On the effect of feedback delay on limited-rate beamforming systems

Journal Article

The use of beamforming to enable higher data rates in telecommunications is widely appreciated, but performance gains are typically calculated assuming delay-free feedback from the receiver and neglecting processing time. This paper introduces a mathematical framework based on outage probability that measures the extent to which current channel state information is accurate. Performance gains from beamforming can then be evaluated as a function of the currency of system state. Results are provided for Multiple Input Single Output (MISO) and for Multiuser Multiple Input Multiple Output (MU-MIMO) systems. Outage probabilities and effective diversity orders are calculated for widely used methods of beamforming such as Transmit Antenna Selection as a function of the speed of channel variation. ©2010 IEEE.

Full Text

Duke Authors

Cited Authors

  • Wu, Y; Achtzehn, A; Petrova, M; Mähönen, P; Calderbank, R

Published Date

  • December 1, 2010

Published In

  • Globecom Ieee Global Telecommunications Conference

Digital Object Identifier (DOI)

  • 10.1109/GLOCOM.2010.5684288

Citation Source

  • Scopus