Patent ID: 8391393
Filing Date: 2013-03-05
Classification: H04B

Abstract:
1. A method of transmitting a signal by a user equipment using 4 antennas, the method comprising: obtaining transmission rank information; generating a precoded signal by precoding layer signals using a specific precoding matrix that corresponds to the transmission rank information, transmitting the generated precoded signal, wherein the specific precoding matrix is selected from a 4-antenna codebook, the 4-antenna codebook including a first type precoding matrix defined as a 4-by-3 matrix type that includes 2 non-zero components in each row and 2 zero components in first and second columns for a rank of 3, wherein a number of the precoded layer signals corresponds to the transmission rank information, wherein the first type precoding matrix has a type resulting from multiplying by a normalization coefficient, wherein N and wherein N is set to 4 or 8.