1. A method of controlling transmission from a multi-antenna transmitter comprising: generating an initial set of template channel realizations; determining second-order statistics for actual channel realizations at a targeted receiver; adapting the initial set of template channel realizations as a function of the second-order channel statistics to obtain a set of virtual channel realizations that reflect the second-order channel statistics of the actual channel realizations; and determining one or more transmission control parameters as a function of the set of virtual channel realizations for controlling transmission to the targeted receiver.