1. A cellular communications system comprising: a base station and at least one mobile station communicating therewith, said base station comprising a plurality of antennas, and a modulator for providing a transmit signal for each antenna, said modulator estimating a weighting factor for each transmit signal based upon considering each transmit signal as having an unknown and arbitrary fading factor associated therewith, and based upon considering the unknown and arbitrary fading factors to have a predetermined cross-correlation function.