Patent ID: 7646749

Claim:
A downlink beamforming apparatus of an orthogonal frequency division multiplex access system, the downlink beamforming apparatus comprising: a subcarrier based user identifier for dividing subcarriers according to users; a beamforming weight buffer for storing and outputting first beamforming weights for the subcarriers by each of a plurality of transmitting antennas; an interpolator for outputting second beamforming weights for each transmitting antenna by interpolating the first beamforming weights outputted by the beamforming weight buffer; a signal reproducer for making at least one copy of a signal to reproduce the signal for each transmitting antenna, wherein the subcarriers are allocated to the signal by each user; and a complex multiplier for multiplying the signal for each transmitting antenna reproduced by the signal reproducer by the second beamforming weights for each transmitting antenna outputted from the interpolator.