Patent ID: 7747225

Claim:
A method on an RF communications receiver, the method comprising: receiving n downlink pilot signals with at least one receive antenna at a receiver, each of the n downlink pilot signals being associated with a respective one of n downlink transmit antennas at a remote transmitter transmitting the n downlink pilot signals; determining, based upon the received n downlink pilot signals, a respective RF propagation channel between each respective receive antenna within the at least one receive antenna at the receiver and each respective downlink transmit antenna within n downlink transmit antennas at the remote transmitter; determining, based upon characteristics of each respective downlink RF propagation channel, n downlink transmit antenna weighting factors for each downlink data stream from the remote transmitter to the receiver, each downlink transmit antenna weighting factor within the n downlink transmit antenna weighting factors corresponding to a respective weighting factor to be applied to one respective downlink transmit antenna within n downlink transmit antennas and one respective downlink data stream being transmitted from the remote transmitter to the receiver within at least one downlink data streams; modulating a respective modulation signal onto a first of n uplink subcarriers by summing, to produce a first sum, complex values corresponding to the respective RF propagation channel for a first subcarrier between n base station transmit antennas and the at least one transmitting receive antenna at the remote transmitter; calculating a conjugate of the first sum; multiplying a first of the n downlink antenna weighting factors by the conjugate of the first sum to produce the respective modulation signal; and scaling the respective modulation signal for the first subcarrier; and transmitting the uplink subcarriers through at least one transmitting receive antenna that is within the at least one receive antenna.