Patent ID: 7751381
Filing Date: 2010-07-06
Classification: H04W

Abstract:
1. A wireless base station for transmitting packets to a plurality of terminals, comprising: an array antenna which transmits packets to terminals; a packet scheduler which determines transmission sequence of the packets; a modulator which generates modulated signals based on the packets; a beam former for a transmission signal which multiplies the packets with array weights for the transmission signal and outputs the transmission signal to the array antenna, a correlator which calculates correlations between the array weights for the transmission signal; and a demodulator which demodulates a received signal from the terminal and extracts the states of downlink channels included in the demodulated signal which is estimated by the terminal, wherein, the beam former for the transmission signal comprises a memory which stores the array weights for transmission signal associated with the terminals' IDs, wherein the beam former for transmission signal receives the IDs of selected terminals from the packet scheduler, refers to the memory, and selects the array weights for transmission signal by the IDs of the terminals, and wherein the packet scheduler determines the transmission sequence of the packets, based on the correlations between the array weights and the states of the downlink channels.