Abstract

SORIANO-EQUIGUA, L.; SANCHEZ-GARCIA, J.; CHAE, C.-B.  and  HEATH JR., R. W.. Improved Iterative Coordinated Beamforming Based on Singular Value Decomposition for Multiuser Mimo Systems With Limited Feedforward. J. appl. res. technol [online]. 2011, vol.9, n.3, pp.342-354. ISSN 2448-6736.

Coordinated beamforming based on singular value decomposition is an iterative method to jointly optimize the transmit beamformers and receive combiners, to achieve high levels of sum rates in the downlink of multiuser systems, by exploiting the multi-dimensional wireless channel created by multiple transmit and receive antennas. The optimization is done at the base station and the quantized beamformers are sent to the users through a low rate link. In this work, we propose to optimize this algorithm by reducing the number of iterations and improving its uncoded bit error rate performance. Simulation results show that our proposal achieves a better bit error rate with a lower number of iterations than the original algorithm.

Keywords : Coordinated beamforming; multiuser MIMO; iterative; convergence; bit error rate.