1. A method for communicating in a wireless personal area network, comprising: using adaptive beamforming configured for a low-rate mode for reliable low-rate communications and a high-rate mode for high-rate communications; and using a fast algorithm to perform antenna beamforming for said high rate mode, wherein said fast algorithm includes training performed on a block-by-block basis with decision feedback from a receiver (RX) to a transmitter (TX) about the usefulness of further training stages.