WO WO2026169749A1
Systems and methods for direct-to-device satellite communications in which a centralized processor coupled to a network receives data streams intended for user equipment (UE) devices located in a coverage area. The processor obtains channel state information (CSI) characterizing radio frequency (RF) channels between the UEs and antennas of a plurality of satellites orbiting the coverage area. Precoding weights are computed based on the CSI, and precoded waveforms are generated. The plurality of satellites cooperatively transmit the precoded waveforms such that they combine coherently at the location of each UE to form independent RF channels, delivering distinct data streams to the UEs. The system may exploit uplink/downlink channel reciprocity and derive full bandwidth CSI from narrowband uplink sounding signals.
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