Patent ID: 8553620

Claim:
A data transmission method in a multiple antenna system, the method comprising: generating a transmit (Tx) signal in a plurality of antennas by applying a precoding weight matrix to first and second antenna clusters including the plurality of antennas, wherein: the precoding weight matrix is a block diagonal matrix that is configured with a precoding weight corresponding to the first antenna cluster and a precoding weight corresponding to the second antenna cluster; the precoding weight corresponding to the first antenna cluster is selected according to a channel condition; and the precoding weight corresponding to the second antenna cluster is different from the precoding weight corresponding to the first antenna cluster and is selected according to a specific rule irrespective of the channel condition in order to receive feedback data for only the first antenna cluster, the feedback data including a precoding matrix indicator (PMI); transmitting the Tx signal; and receiving the PMI for selection of the precodinq weight corresponding to the first antenna cluster, wherein: a whole frequency band includes a plurality of subbands each including a plurality of subcarriers; and the precodinq weight corresponding to the second antenna cluster is applied to each of the plurality of subbands.