1. A method of transmitting communication signals to a plurality of targeted receivers comprising: transmitting one or more information streams for individual ones of the targeted receivers according to ongoing transmission scheduling; and controlling the ongoing transmission scheduling to reduce the number of impairment contributors that must be considered in received signal processing by scheduled ones of the targeted receivers; wherein controlling the ongoing transmission scheduling to reduce the number of impairment contributors that must be considered in received signal processing by schedule ones of the targeted receivers comprises restricting the number of simultaneous transmit pre-coding weights used to transmit different information streams to fewer than the defined number of transmit pre-coding weight combinations.