1. A method comprising: observing a predetermined number of spatial signatures for a communications channel between a base station and a mobile terminal during a predetermined time period; calculating a norm of errors between neighboring pairs of the observed spatial signatures; generating at the base station one or more test spatial signatures from a previously observed spatial signature that form a vector space about the previously observed spatial signature based on statistical analysis of the observed predetermined number of spatial signatures, wherein generating the one or more test spatial signatures is based on the norm of errors, and such that the vector space is wider than a vector space associated with the observed predetermined number of spatial signatures; and deriving beamforming weights based on the one or more test spatial signatures for beamforming a transmission to the mobile terminal via an antenna subsystem of the base station, wherein the beamforming weights are configured to generate a wider de-focused beam relative to a beam generated from the observed predetermined number of spatial signatures.