A method for transmitting channel status information, CSI, of downlink transmission via uplink in a wireless communication system, the method comprising: transmitting a rank indicator, RI, and a precoder type indicator, PTI, at a first subframe; at a second subframe, transmitting a first precoding matrix indicator, PMI, for a wideband, WB, when the PTI has a first value, and transmitting a second PMI for the WB and a channel quality indicator, CQI, for the WB when the PTI has a second value; and at a third subframe, transmitting the second PMI for the WB and the CQI for the WB when the PTI has the first value, and transmitting the CQI for a subband, SB, and the second PMI for the SB when the PTI has the second value, wherein a user equipment, UE, preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, and wherein subsampled codebooks of precoding codebooks of individual Rank-2, Rank-3 and Rank-4 are applied to the second PMI for the SB to have a size of 2 bits, wherein the precoding codebook for the Rank-2 is represented by the following table 1: [Table 1] i 1 i 2 0 1 2 3 0 - 15 W 2 i 1,2 i 1,0 2 W 2 i 1,2 i 1,1 2 W 2 i 1 + 1,2 i 1 + 1,0 2 W 2 i 1 + 1,2 i 1 + 1,1 2 i 1 i 2 4 5 6 7 0 - 15 W 2 i 1 + 2,2 i 1 + 2,0 2 W 2 i 1 + 2,2 i 1 + 2,1 2 W 2 i 1 + 3,2 i 1 + 3,0 2 W 2 i 1 + 3,2 i 1 + 3,1 2 i 1 i 2 8 9 10 11 0 - 15 W 2 i 1,2 i 1 + 1,0 2 W 2 i 1,2 i 1 + 1,1 2 W 2 i 1 + 1,2 i 1 + 2,0 2 W 2 i 1 + 1,2 i 1 + 2,1 2 i 1 i 2 12 13 14 15 0 - 15 W 2 i 1,2 i 1 + 3,0 2 W 2 i 1,2 i 1 + 3,1 2 W 2 i 1 + 1,2 i 1 + 3,0 2 W 2 i 1 + 1,2 i 1 + 3,1 2 where W m, m ', n 2 = 1 4 v m v m ' φ n v m − φ n v m ' where φ n is denoted by φ n = e jπn /2 and v m is denoted by v m = [1 e j 2 πm /32 e j 4 πm /32 e j 6 πm /32] T, where a value of the first PMI corresponds to i 1 of the precoding codebook, and a value of the second PMI corresponds to i 2 of the precoding codebook, and wherein the subsampled codebook for the Rank-2 includes i 2 = 0, 2, 4, 6. transmitting a rank indicator, RI, and a precoder type indicator, PTI, at a first subframe; at a second subframe, transmitting a first precoding matrix indicator, PMI, for a wideband, WB, when the PTI has a first value, and transmitting a second PMI for the WB and a channel quality indicator, CQI, for the WB when the PTI has a second value; and at a third subframe, transmitting the second PMI for the WB and the CQI for the WB when the PTI has the first value, and transmitting the CQI for a subband, SB, and the second PMI for the SB when the PTI has the second value, wherein a user equipment, UE, preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, and wherein subsampled codebooks of precoding codebooks of individual Rank-2, Rank-3 and Rank-4 are applied to the second PMI for the SB to have a size of 2 bits, wherein the precoding codebook for the Rank-2 is represented by the following table 1: [Table 1] i 1 i 2 0 1 2 3 0 - 15 W 2 i 1,2 i 1,0 2 W 2 i 1,2 i 1,1 2 W 2 i 1 + 1,2 i 1 + 1,0 2 W 2 i 1 + 1,2 i 1 + 1,1 2 i 1 i 2 4 5 6 7 0 - 15 W 2 i 1 + 2,2 i 1 + 2,0 2 W 2 i 1 + 2,2 i 1 + 2,1 2 W 2 i 1 + 3,2 i 1 + 3,0 2 W 2 i 1 + 3,2 i 1 + 3,1 2 i 1 i 2 8 9 10 11 0 - 15 W 2 i 1,2 i 1 + 1,0 2 W 2 i 1,2 i 1 + 1,1 2 W 2 i 1 + 1,2 i 1 + 2,0 2 W 2 i 1 + 1,2 i 1 + 2,1 2 i 1 i 2 12 13 14 15 0 - 15 W 2 i 1,2 i 1 + 3,0 2 W 2 i 1,2 i 1 + 3,1 2 W 2 i 1 + 1,2 i 1 + 3,0 2 W 2 i 1 + 1,2 i 1 + 3,1 2 where W m, m ', n 2 = 1 4 v m v m ' φ n v m − φ n v m ' where φ n is denoted by φ n = e jπn /2 and v m is denoted by v m = [1 e j 2 πm /32 e j 4 πm /32 e j 6 πm /32] T, where a value of the first PMI corresponds to i 1 of the precoding codebook, and a value of the second PMI corresponds to i 2 of the precoding codebook, and wherein the subsampled codebook for the Rank-2 includes i 2 = 0, 2, 4, 6.