Method and precoder information feedback in multi-antenna wireless communication systems

1. A wireless communication device configured for sending precoder matrix information to a base station, the device comprising:

a transmitter configured for sending a first representation of a first matrix chosen from a first codebook, wherein the first matrix has at least two column vectors, and for sending a second representation of a second matrix chosen from a second codebook;

wherein the first representation and the second representation together convey a precoder matrix of one or more vectors associated with one or more spatial layers, the precoder matrix comprises a first sub-precoder matrix including a first set of weights on a first subset of transmit antennas of the base station, and a second sub-precoder matrix including a second set of weights on a second subset of transmit antennas of the base station, wherein the first and the second subsets of transmit antennas of the base station are non-overlapping; and

wherein the first sub-precoder matrix is one or more column vectors of the first matrix corresponding to the first representation, multiplied by one or more entries of the second matrix corresponding to the second representation, and the second sub-precoder matrix is one or more column vectors of the first matrix corresponding to the first representation, multiplied by one or more entries of the second matrix corresponding to the second representation.

2. The wireless communication device of claim 1 , wherein the first matrix has at least two column vectors and wherein the at least two column vectors are different.

3. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending, via the transmitter, the first representation of the first matrix chosen from the first codebook, wherein the first representation is an index of the chosen matrix in the first codebook.

4. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second representation is an index of the chosen matrix in the second codebook.

5. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending the first representation of the first matrix chosen from the first codebook, wherein the first codebook includes a set of matrices whose column vectors are Discrete Fourier Transform (DFT) vectors.

6. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix has at least two entries that have different and non-zero amplitude.

7. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix has the same vector norm of each row of the second matrix.

8. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix has the same vector norm of each column of the second matrix.

9. The wireless communication device of claim 1 , wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix comprises entries that are co-phasing factors associated with the first sub-precoder matrix and the second sub-precoder matrix.