Patent ID: 8731091
Filing Date: 2014-05-20
Classification: H04B,H04L

Abstract:
1. A method for determining precoding matrix based on an open-loop Multi-Input Multi-Out (MIMO) scheme, comprising: applying a first precoding matrix to downstream data to transmit the downstream data through a plurality of antennas, the first precoding matrix being selected from a codebook which comprises a plurality of precoding matrixes; and changing the first precoding matrix to a second precoding matrix per predetermined period, and applying the second precoding matrix to the downstream data to transmit the downstream data through the antennas, wherein the second precoding matrix is a precoding matrix corresponding to an index which has been shifted by a certain value from an index of the first precoding matrix in a direction where an index of a precoding matrix increases, in the codebook, wherein the first precoding matrix is determined with an identifier (ID) of a subcarrier which comprises the downstream data, the number of subcarriers which configure one subband comprising the downstream data, and the number of precoding matrixes comprised in the codebook, wherein the applying of a first precoding matrix comprises: