Patent ID: 8594036

Claim:
A method for transmitting data to an uplink by applying a precoding matrix in an open-loop multiple input multiple output (MIMO) system, the method comprising: selecting a precoding matrix and applying the selected precoding matrix to data during initial transmission; selecting a precoding matrix and applying the selected precoding matrix to data to be retransmitted; and retransmitting the data to which the precoding matrix is applied, wherein an index of the precoding matrix applied to the data is determined based on the times of current retransmission times of the data and index of the precoding matrix applied during initial transmission of the data, and wherein the index of the precoding matrix is determined by n=(i+c×r)mod N, n representing the index of the precoding matrix, i representing an index of the precoding matric applied during initial transmission of the data, r representing the number of current retransmission times of the data, c representing a constant, and N representing the number of precoding matrices.