Patent ID: 7342912
Filing Date: 2008-03-11
Classification: H04B,H04L

Abstract:
1. A method comprising: receiving signals from a remote radio; deriving estimates of receive channels corresponding to the received signals using the received signals; deriving a model of an expected transmit channel to the remote radio based on the receive channel estimates; deriving a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel; and transmitting to the remote radio by applying the derived set of transmit parameters to the transmit antenna array, wherein the estimated transmit signal quality comprises an expected difference in phase at the remote radio between a signal transmitted using candidate transmit weights and a pilot signal transmitted from the antenna array using other transmit weights.