Under uncertain channel conditions, local and global power control factors for amplify-and-forward relay processing and source-destination beamforming are jointly and iteratively designed based on a minimum mean-square-error (MMSE) criterion. The influence of imperfect channel information on system performance is examined by computer simulation. As a result, it is verified that the proposed power control methods can relieve the performance degradation arising from channel uncertainties.
Michael Christoph Gastpar, Alper Köse, Ahmet Arda Atalik
Nicolas Macris, Jean François Emmanuel Barbier
Michaël Unser, Pakshal Narendra Bohra